JP2001343070A - Booster for operating transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight and compact booster which can operate a striker smoothly and properly by reducing the manufacturing cost of a transmission. SOLUTION: The transmission provides a power cylinder 10 which is constituted integrally with a transmission upper case 2 and rotates a transmission striker 8 and a control valve 6 controlling the supply and the exhaust of the air pressure to a power cylinder 10 which is operated by a command operating force transmitted from a shift lever. The striker 8 is connected so that the striker 8 can rotate unitary with the outer periphery of a shift shaft and be moved toward the longitudinal shaft direction. There are an engaging protrusion 8b in the striker 8 and an engaging member 74 in the piston rod 72 of the power cylinder 10 so that the striker 8 can be rotated by engaging the member 74 and the protrusion 8b if the shift lever is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission operating booster for boosting a shift command operating force transmitted from a change lever via a shift link mechanism to perform a shift operation of a transmission. It is.

[0002]

2. Description of the Related Art In a shift operation system for a transmission, a change lever in a driver's seat and a shift lever and a select lever of the transmission are connected by a shift link mechanism and a select link mechanism, respectively. The power booster is provided between a shift lever of the transmission and a shift link mechanism, and operates the shift lever by boosting a shift operation force from a change lever by air pressure.

[0003] The transmission includes a select operation performed by moving a striker on a shift shaft in the axial direction of the shaft, and a shift operation of rotating the striker from a neutral position to a shift position where the gears mesh with each other. The shift operation of the transmission is performed in combination with the operation. Since the select operation only moves the striker in the axial direction of the shift shaft, no particularly large force is required. However, the shift operation requires a large force to engage the gears. Therefore, the transmission operation booster is
It is provided to assist a large force required for the shift operation.

A conventional general structure of the transmission operating booster (for example, see Japanese Patent Application Laid-Open No. 8-247281).
In brief, the output rod slidably provided in the housing is engaged with the shift lever of the transmission, and the stroke of the output rod causes the shift lever to rotate to perform the shift operation of the transmission. The housing of the booster is separate from the transmission, and is externally attached to an upper case of the transmission.

[0005] A cylinder chamber of a power cylinder is provided on the outer peripheral side of the output rod in the housing, and the cylinder chamber is divided into two pressure chambers by a piston fixed to the outer periphery of the output rod. An input rod (operating rod in the above publication) is slidably provided in the output rod, and one end thereof is connected to a change lever via a link mechanism. A control valve (a switching valve in the above publication) is provided at the end of the input rod in the output rod, and an input pipe member for operating the control valve is provided at the tip of the input rod.

[0006] The control valve is fixed to the inner circumference of the output rod,
A valve seat member having a pair of opposed valve seats, two valve bodies disposed between the valve seat members and urged by a spring to be seated on each of the valve seats, and separating these valve bodies from the valve seats The valve lifter includes a pair of valve lifters, and a spring that presses the valve lifters away from the respective valve members.

An air chamber in which the valve body in the valve seat member is housed is connected to an air source, and an operating pressure chamber (an output pressure chamber in the above publication) in which a valve lifter outside the valve seat member is disposed.
Is connected to each pressure chamber of the power cylinder.

In the conventional transmission operating booster having the above structure, when the shift lever is shifted, the input rod is moved in the shift direction, and one of the valve lifters is moved by the input rod or the input pipe member. hand,
The valve body is separated from the valve seat. As a result, the air in the air chamber is supplied to one pressure chamber of the power cylinder through one working pressure chamber, and the piston strokes. Then, since the output rod makes a stroke, the shift lever rotates and the shift operation of the transmission is performed.

[0009]

The conventional transmission operating booster is provided outside the transmission, and its housing is attached to an upper case of the transmission. Therefore, installation space is required,
There is a problem that the weight increases and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a booster for operating a transmission, which can greatly reduce an installation space and can be reduced in size, weight, and cost. The purpose is to do so.

It is another object of the present invention to provide a transmission operating booster that can reliably and smoothly operate the striker.

[0012]

SUMMARY OF THE INVENTION A transmission operating booster according to the present invention boosts a shift command operating force transmitted from a shift command operating means via a shift command operating force transmitting means. A power cylinder that is provided integrally with an upper case of the transmission and rotates a striker of the transmission, and a power cylinder inside the shift shaft of the transmission or the upper case. A control valve that is provided integrally with the control valve and that is operated by a shift command operating force from the shift command operating means to control supply and discharge of fluid pressure to and from the power cylinder, and is connected to the shift command operating force transmitting means; A control valve operating means for operating the control valve, an engaging portion provided on one of a striker and a shift shaft of the transmission, and an output shaft of the power cylinder. An engagement member engageable with the engagement portion, wherein the engagement member acts on the engagement portion to rotate the striker only when a shift operation of the shift command operation means is performed. It is.

According to a second aspect of the present invention, in the transmission operating booster, the engaging portion is provided on the striker, and projects in a radial direction or in an axial direction of the shift shaft. On the other hand, the engagement member has an engagement hole into which the engagement projection is inserted, and the inner surface of the engagement hole of the engagement member only when a shift operation of the shift command operation means is performed. Are adapted to engage with the engaging projections.

Further, in the transmission operating booster according to claim 3, the engaging portion is an engaging lever provided to protrude in a radial direction of the shift shaft, and a tip of the engaging member. The part is always engaged with the engagement lever.

Further, the transmission operating booster according to claim 4 is characterized in that a guide portion of the engaging member is formed in the upper case.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a plan view showing a cross section of a part of a transmission operating booster according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. In this embodiment, a control valve 6 of a booster is disposed inside a shift shaft 4 housed in an upper case 2 of a transmission. A shift link mechanism from a change lever in the driver's seat (not shown) is connected to a lever (input transmission lever) 18 for operating the control valve 6. Also,
A power cylinder 10 for rotating a striker 8 provided on the shift shaft 4 is integrally provided in the upper case 2.

First, a control valve operating means for transmitting a shift command operating force by operating a change lever (not shown), which is a shift command operating means, to the control valve 6 will be described.
1 and 2 and FIG. 3 which is a cross-sectional view taken along the line BB of FIG. A shift lever 12 is fixed to an end of the shift shaft 4 (the right end in FIGS. 1 and 2). The shift shaft 4 is attached to the shift lever 12.
A fulcrum pin 14 parallel to the axis O ₁ is fixed, and an input transmission lever 18 is rotatably attached to the fulcrum pin 14 via a spacer 16. Therefore, the input transmission lever 18 can rotate about the fulcrum pin 14 with respect to the shift lever 12, but since the input transmission lever 18 is sandwiched between the head 14 a of the pin 14 and the spacer 16, the input transmission lever 18 is Cannot be moved.

The shift lever 12 and the input transmission lever 1
A cover housing 20 that covers the shift lever 12 and the input transmission lever 18 is provided on the end side (the right side in FIGS. 1 and 2) of the shift shaft 4 where the shift shaft 8 is provided, and is fixed to the upper case 2. I have. The cover housing 20 prevents dust and muddy water from entering these lever portions.

The input transmission lever 18 is connected to a shift link mechanism from a change lever (not shown) near an end farther from the shift shaft 4 (a lower side in FIG. 2). That is, a rod 24 is connected to one end of the input transmission lever 18 via a ball joint 22, and a joint member 28 fitted to the tip of a boot 26 attached to the opening 20 a of the cover housing 20. The ends are screwed and connected. The rod 3 of the link mechanism for shifting from the change lever
0 is screwed and connected to the joint member 28. Since the shift link mechanism (the rod 30 at the end thereof) and the input transmission lever 18 are thus connected via the joint member 28, the connection operation is extremely easy.

An axially extending valve hole 4a (see FIG. 4 showing an enlarged view of the control valve 6) is formed inside the shift shaft 4, and a control valve 6 to be described later is formed in the valve hole 4a. Is housed. This shift shaft 4
An input transmission member 32 for transmitting a shift command operating force by operating the change lever to the control valve 6 to operate the control valve 6 is slidably fitted to the opening side of the valve hole 4a. The input transmission member 32 has a through hole 3 in the diameter direction.
2a is formed. The through hole is an elongated hole 32a extending in the axial direction, and a pin 34 having both ends fixed to the shift shaft 4 is inserted into the elongated hole 32a. Therefore, the input transmission member 32 rotates integrally with the shift shaft 4 in the rotation direction, and the elongated hole 3 in the axial direction.
Relative movement is possible by the length of 2a.

[0021] The input transmission member 32, the lower surface side of the shift lever 12 and the input transmission lever 18 is attached (the lower side in FIG. 2), inclined grooves inclined approximately 45 degrees with respect to the axis O ₁ of the shift shaft 4 32b are formed (see FIG. 5). On the other hand, a plate-like inclined portion 18a having the same inclination as the inclined groove 32b of the input transmission member 32 is formed at an end (the upper end in FIG. 2) of the input transmission lever 18 on the shift shaft 4 side. It is fitted in the inclined groove 32b. Since the inclined portion 18a of the inclined groove 32b to the input transmission lever 18 of the input transmission member 32 is fitted, the input transmission lever 18 about the axis O ₁ and parallel to the fulcrum pin 14 of the shift shaft 4 When rotated, the position of the inclined portion 18a in the inclined groove 32b changes, and the input transmission member 32 moves in the axial direction of the shift shaft 4. In addition,
Of the inclined portion 18a of the inclined groove 32b and the input transmission lever 18 of the input transmission member 32, the inclination angle relative to the axis O ₁ of the shift shaft 4 is of course not limited to 45 degrees.

One end of the shift shaft 4 (FIGS. 1 and 2)
Of the shift lever 12 fixed to the right end of the shift lever 12).
Is bent in an L-shape toward the input transmission lever 18 side, and a notch 12b is formed in the bent distal end portion 12a.
Are formed. The notch 12b has a width wider than the width of the input transmission lever 18, as shown in FIGS. 3 and 5, and the tip of the input transmission lever 18 is positioned within the notch 12b with a gap. ing. Input transmission lever 18
Is rotatable relative to the shift lever 12 as described above, but when rotated by a predetermined angle, both ends (stopper portions) of the notch 12b of the shift lever 12
Further relative rotation is regulated by abutting on 12c and 12d.

Next, the structure of the control valve 6 will be described with reference to FIG. 1, FIG. 2 and FIG.
A pair of cylindrical valve seat members 36 and 37 are inserted and fixed in the valve hole 4a of the shift shaft 4. A step 4b is formed at the back of the valve hole 4a, and a cylindrical member 38 and a ring-shaped locking member 40 are formed at the opening side.
Are sequentially inserted, and the locking members 40 are inserted into the pins 42 (FIG. 2) inserted from both sides into the radial holes of the shift shaft 4.
), And the pair of valve seat members 3
6 and 37 are fixed between the step portion 4b of the valve hole 4a and the locking member 40.

A pair of annular valve seats 44 and 45 are formed on the inner peripheral surfaces near the ends of the two valve seat members 36 and 37 so as to face each other. A pair of poppet valves 46, 47 that can be seated on the respective valve seats 44, 45 are accommodated between the two valve seats 44, 45 in the valve seat members 36, 37, and disposed between the two poppet valves 46, 47. One spring 4
8, they are urged in opposite directions to be seated on the valve seats 44 and 45, respectively.

An input rod 50 is fixed to a distal end of the input transmission member 32 on the inner side of the valve hole 4 a by a connecting pin 51. An internal passage 50a penetrating in the axial direction is formed inside the input rod 50, and the axial internal passage 50a constitutes an exhaust passage of the control valve 6 described later. Valve lifters 52, 53 for pressing the poppet valves 46, 47 to separate from the valve seats 44, 45, respectively, are slidable on the outer periphery of the input rod 50 outside the pair of poppet valves 46, 47. Mated.
When the valve lifters 52 and 53 are not operated, one of the valve lifters 52 (left side in the figure) is connected to a spring 54.
The valve lifter 53 (the right side in the figure) stops when it hits the ring 58 fitted to the end of the input rod 50 and is pushed by the spring 55 to move the input transmission member 3.
2 and stops.

The valve seat members 36 and 37 having the pair of valve seats 44 and 45, the pair of poppet valves 46 and 47, and the valve lifters 52 and 53 for separating the poppet valves 46 and 47 from the valve seats 44 and 45 are provided. When the input transmission member 32 moves in the axial direction of the shift shaft 4 by the rotation of the input transmission lever 18, the control valve 6 is configured.
One of the valve lifters 52, 53 is pushed to open one poppet valve 46, 47 by separating from one of the valve seats 44, 45.

A chamber (air chamber) 60 in which the pair of poppet valves 46, 47 inside the valve seat members 36, 37 is housed.
The inside is connected to an air source 63 via an air pipe 62. Each of the operating pressure chambers 64, formed around the valve lifters 52, 53 located outside the valve seat members 36, 37,
65 are respectively connected to two pressure chambers 70a and 70b of the power cylinder 10 described later (see FIGS. 1 and 6).

When the control valve 6 is not operated, the working pressure chambers 64 and 65 are provided with a clearance between the outer peripheral surfaces of the distal ends of the valve lifters 52 and 53 and the inner peripheral sides of the valve seats 44 and 45, and the valve lifters 52 and 53. Between the tip end surfaces of the poppet valves 46 and 47, the spaces on the inner peripheral side of the tip portions of the valve lifters 52 and 53, the radial holes 50b and 50c of the input rod 50, the axial internal passage 50a of the input rod 50, Input rod 50
A radial hole 50d formed on the side of the input transmission member 32,
A chamber in the cover housing 20 via a radial hole 32c at the distal end of the input transmission member 32, a chamber 66 around the distal end of the input transmission member 32, a radial hole 4c of the shift shaft 4 (see FIG. 2), and the like. (Lever chamber) 68, and is open to the atmosphere through an exhaust port 20b formed in the cover housing 20. Therefore, in the control valve 6, the poppet valves 46 and 47 and the valve seats 44 and 4 of the valve seat members 36 and 37 are provided.
5 constitute a supply valve, and the valve lifters 52 and 53
And the poppet valves 46 and 47 constitute an exhaust valve.

The input transmission section of the shift shaft 4 (FIG. 1)
A spline 4d is formed on the outer periphery near the end opposite to the end opposite to the right side of FIG. 2 (see FIGS. 2 and 6), and the striker 8 is fitted to the spline 4d. Therefore,
The striker 8 rotates integrally with the shift shaft 4 in the rotation direction and can move in the axial direction. An engagement protrusion 8b is provided on the striker 8 on the opposite side (upper side in FIG. 2) from the shift operation portion 8a for meshing the gears of the transmission. The power cylinder 10 engages with an engagement member 74 fixed to the piston rod 72 of the cylinder 10.
, The striker 8 is rotated. Engagement projection 8b
As shown in FIGS. 2 and 6, the upper surface is flat and the outer periphery is a spherical curved surface.

The output of the control valve 6 makes the striker 8
The power cylinder 10 for rotating the power transmission is provided integrally with the upper case 2 of the transmission. Upper case 2
A piston 76 is fitted in the cylinder chamber 70 provided at the front and rear so as to be able to move forward and backward, and the interior thereof is divided into two pressure chambers 70a and 70a.
0b. One (upper in FIG. 1) 70a of the two pressure chambers 70a and 70b is connected to one operating pressure chamber 64 (left side in FIG. 1) of the control valve 6 via an air pipe 78, and the other pressure chamber. 70b (the lower part in FIG. 1) is an air pipe 79
Is connected to the other working pressure chamber 65 (to the right in FIG. 1).

[0031] The piston 76 is provided at the distal end of said shift shaft and adapted to advance and retreat in a direction perpendicular to the axis O ₁ of 4, the output shaft integral with the piston 76 (piston rod) 72 An engaging member 74 is fixed to the threaded portion by a nut 73. This engaging member 74
Is longer engaged in the axial O ₁ direction of the shift shaft 4 long hole 7
4a, and the engagement projection 8b of the striker 8 is fitted into the long hole 74a of the engagement member 74. Therefore, when the power cylinder 10 is operated, the piston rod 72 integrated with the piston 76 moves to the axis O of the shift shaft 4.
The piston rod 7 moves forward and backward in a direction perpendicular to _one direction.
The engaging member 74 fixed to 2 moves forward and backward. Then, the engagement member 74 is engaged with the engagement protrusion 8b, and rotates the striker 8.

The striker 8 has a select lever 80 which is responsive to a select link mechanism (not shown).
Are engaged (see FIGS. 1 and 2), and the striker 8 moves in the axial direction along the shift shaft 4 in response to the selection operation of the change lever. As described above, the engagement projection 8b provided on the upper portion of the striker 8 is fitted in the elongated hole 74a in the axial direction of the engagement member 74 so as to be movable in the axial direction of the shift shaft 4. The structure for performing the shift operation of the transmission does not affect this select operation.

The upper surface of the engagement member 74 is a flat surface as shown in FIGS. 2 and 6, and is arranged close to the ceiling inner surface 2a of the upper case 2. Therefore, the piston 76 (piston rod 72) and the engaging member 7
When the member 4 is about to rotate, the upper surface of the engaging member 74 comes into contact with the inner surface (guide portion) 2a of the upper case 2 so that the rotation is restricted.

The operation of the transmission operating booster according to the above configuration will be described. When a shift lever (not shown) in the driver's seat is shifted, the operating force is transmitted to the input transmission lever 18 via a shift link mechanism (only the rod 30 at the end is shown).
Rotates about a fulcrum pin 14 fixed to the shift lever 12 in a plane orthogonal to the axis O ₁ of the shift shaft 4.

When the input transmission lever 18 rotates, the inclined portion 18a provided at the end (upper side in FIG. 2) of the input transmission lever 18 opposite to the side connected to the shift link mechanism rotates. Therefore, the engagement position between the inclined portion 18a of the input transmission lever 18 and the inclined groove 32b of the input transmission member 32 changes, and the input transmission member 32
To move the axis O ₁ direction.

When the input transmission member 32 moves in the axial direction of the shift shaft 4, one of the valve lifters 52 and 53 is pressed and moved by the distal end surface of the input transmission member 32 or the ring 58 fixed to the input rod 50. , And abuts one of the poppet valves 46, 47, and connects the one poppet valve 46, 47 to the one valve seat 44,
Separate from 45. Then, from the air source 63 to the air chamber 6
The pressurized air introduced into the valve 0, the poppet valves 46, 4
The air is introduced into one of the working pressure chambers 64 and 65 through a gap between the valve seat 7 and the valve seats 44 and 45, and is supplied to one of the pressure chambers 70 a and 70 b of the power cylinder 10 through the air pipes 78 and 79. .

When air is introduced into one of the pressure chambers 70a, 70b, the piston 76 and the piston rod 72 are operated, and the engaging projection of the striker 8 fitted in the elongated hole 74a of the engaging member 74 is engaged. 8b is rotated by engagement with the engagement member 74, and the striker 8 rotates in the shift direction to perform the shift operation. Note that, as described above, the engagement protrusion 8b
Since the outer peripheral surface is spherical, the contact state between the engagement protrusion 8b and the engagement long hole 74a of the engagement member 74 does not change when the striker 8 rotates.

The shift shaft 4 rotates with the rotation of the striker 8. Then, the fulcrum of the input transmission lever 18 (the fulcrum pin 14 which is the center of rotation) moves in the shift direction, so that the rotation angle of the input transmission lever 18 with respect to the shift lever 12 is reduced, and the inclination of the input transmission lever 18 is reduced. The engagement position of the input transmission member 32 with the inclined groove 32b returns to the inoperative position. Thus, the booster is controlled in accordance with the shift operation of the change lever, and the shift operation of the transmission is controlled.

When the above-described booster is operated, the pressure in the operating pressure chambers 64 and 65 acts in a direction to return the valve lifters 52 and 53 to the non-operating position. The force is transmitted to the change lever as a reaction force via the inclined portion 18a of the transmission lever 18, the input transmission lever 18, the shift link mechanism, and the like.

When the shift lever is released after the shift operation is completed, the input transmission lever 18 and the control valve 6 return to the non-operating positions, and the pressure chambers 70a, 7 of the power cylinder 10 are moved.
The pressure in Ob is the air piping 78, 79, the working pressure chamber 64,
65, valve lifters 52, 53 and poppet valves 46, 47
, The radial holes 50b, 5 of the input rod 50
0c and the axial internal passage 50a, the radial hole 32c of the input transmission member, the radial hole 4c of the shift shaft 4,
The air is released to the atmosphere through an exhaust passage formed by a lever chamber 68 in the cover housing 20, an exhaust port 20b of the cover housing 20, and the like.

During a normal shift operation, the transmission operating booster operates as described above. However, when the booster mechanism fails when the air source 63 or the control valve 6 fails. When the control valve 6 is operated by rotating the input transmission lever 18 via the shift link mechanism by operating the change lever, the pressure chamber 70 of the power cylinder 10
No air is supplied to a and 70b, and no boost operation is performed. In this case, when the input transmission lever 18 is further rotated, the input transmission lever 18 comes into contact with one of the stopper portions 12c and 12d of the shift lever 12, and the shift lever 12 is directly rotated. Thus, the striker 8 rotates to perform the shift operation of the transmission. In the transmission operation booster having the above-described configuration, the mounting space can be significantly reduced, and since a separate housing is not required, the transmission operation booster can be reduced in size, weight, and cost. Can be planned. Moreover, the striker 8 can be reliably and smoothly operated during the shift operation.

FIGS. 7 and 8 show a transmission operating booster according to a second embodiment. The basic configuration thereof is the transmission operating booster according to the first embodiment. Therefore, only different parts will be described.
In this embodiment, the engagement portion of the striker 8 (engagement projection) 8c is provided in parallel to the axis O ₁ of the shift shaft 4. In the first embodiment, the engagement protrusion 8b is provided on the upper end of the striker 8 (see FIG. 2). In this embodiment, the engagement protrusion 8b is provided below the shift shaft 8. .

On the other hand, the output shaft (piston rod) engaging member 82 which is fixed to 72 of the power cylinder 10 has a substantially rectangular engaging hole 82a which opens in the axial O ₁ direction of the shift shaft 4. The engagement hole 82 of the engagement member 82
The engagement protrusion 8c of the striker 8 is inserted through the hole a. The engaging projection 8c of the striker 8 has an elongated rectangular cross section, and the surface of the engaging member 82 that contacts the inner surface of the engaging hole 82a has a curved surface (a curved surface forming a part of a cylinder). . As can be seen from FIG. 7, the engagement protrusion 8c is also used to engage the engagement member 82 even when the select operation is performed and the striker 8 moves in the axial direction along the outer peripheral surface of the shift shaft 4. It has a length that does not fall out of the hole 82a.

Next, the operation of the transmission operating booster according to the above configuration will be described. Since the entire operation is the same as that of the first embodiment, a description thereof will be omitted, and only the operation of the striker 8 will be described. When the change lever is operated to select, the select lever 80 rotates in the horizontal plane via the select link mechanism, and the striker 8 is turned.
The moves in the axial line O ₁ direction of the shift shaft 4, the selecting operation of the transmission is performed. In the case of this select operation, the engagement projection 8c of the striker 8 only moves in the engagement hole 82a of the engagement member 82 in the axial direction, and does not engage with the engagement member 82. Therefore, the engaging member 82 does not affect the selecting operation.

[0045] When the change lever is shifted operated, move the power cylinder 10 is actuated as described above, the engaging member 82 fixed to the piston rod 72, in a direction perpendicular to the axis O ₁ of the shift shaft 4 I do. Engaging member 82
When the arm moves forward or backwards, the inner surface of the engagement hole 82a contacts the side surface of the engagement protrusion 8c of the striker 8, and the two 8, 82 are engaged to rotate the striker 8. Thereby, the shift operation of the transmission is performed. At this time, since the outer surface of the engagement protrusion 8c is a curved surface, the state of engagement between the engagement protrusion 8c and the engagement hole 82a of the engagement member 82 does not change, and the shift operation is performed smoothly.

In this embodiment, the power cylinder 10
The portion of the engagement member 82 having the engagement hole 82a fixed to the piston rod 72 is in a state of hanging down below the shift shaft 4, so that the piston 76 and the piston rod 72 are hard to rotate. Even when the piston 76 and the like rotate, the engaging member 82 is guided by the engaging protrusion 8c of the striker 8, so that the selecting operation and the shifting operation are not affected. Also in this embodiment, as in the first embodiment, the mounting space can be greatly reduced, and since a separate housing is not required, the size and weight of the transmission operating booster can be reduced. And cost reduction can be achieved.
Further, the striker 8 can be easily and smoothly operated.

FIGS. 9 and 10 show a transmission operating booster according to a third embodiment. Since the basic configuration of this embodiment is the same as that of each of the above embodiments, only the structure of the power cylinder 10 and the operation structure of the striker 8 will be described.

A step 4e is formed near the end of the shift shaft 4, and an engagement lever 84 is attached to the step 4e. The engaging lever 84 is striker 8 is provided in a position not exposed be moved in the axial O ₁ direction of the shift shaft 4 during select operation. On the other hand, an engagement member 88 is provided at the tip of the piston rod 86, and the tip of the engagement member 88 is connected to the engagement lever 84.
Is connected via a pin 90 to the tip of the. The engagement hole 84a of the pin 90 provided in the engagement lever 84 of the shift shaft 4 is an elongated hole extending in the direction of the center line of the engagement lever 84. When the piston rod 86 makes a stroke, the engagement lever 84 Can rotate smoothly.

Further, in each of the above embodiments, the piston 76 of the power cylinder 10 and its output shaft (piston rod) 72 are integrated, but in this embodiment, the piston 92 and the piston rod 86 are separate. The piston 92 and the piston rod 86 are fixed by a locking member 94 and a wiring 96. The piston rod 86 has a step having a small-diameter portion 86a fixed to the piston 92 and a large-diameter portion 86b extending toward the shift shaft 4, and a step between the large-diameter portion 86b and the small-diameter portion 86a. These are connected in a state where the piston 92 is brought into contact with the piston.

When the piston 92 is fixed to the piston rod 86, first, the small-diameter portion 86a of the piston rod 86 is inserted into the center hole of the piston 92, and then the outer surface of the small-diameter portion 86a of the piston rod 86 is After inserting a pair of crescent-shaped locking members 94 into the formed annular groove, the piston 92 is moved to the annular groove side, and the locking is performed in the concave portion formed at the end of the center hole of the piston 92. A part of the member 94 is housed to prevent the locking member 94 from falling out of the annular groove. In this state, the piston 92 is fixed by fitting an elastic wire ring 96 into a gap between the opposite end face of the piston 92 and the step of the piston rod 86.

With the above-described fixing structure, the power cylinder 10
When air is supplied to one of the pressure chambers (the upper pressure chamber in FIG. 9) 70a, the piston 92
Is supported by the step of the piston rod 86 via
When air is supplied to the other pressure chamber (the lower pressure chamber in FIG. 9) 70b, the piston 92 is supported by the locking member 94 inserted into the annular groove. Also, the locking member 94 is prevented from falling off by the concave portion on the inner periphery of the piston 92,
Since a force acts only on the side surface of the wiring 96, the wiring 96 does not come off and the piston 9
2 can be securely fixed to the piston rod 86.

With the piston 92 and the piston rod 86 having such a fixing structure, the piston 92 can be easily and reliably fixed, and the cost can be reduced. A structure for fixing a piston by fitting a wiring or a snap ring into a groove of a piston rod is conventionally known. However, since a force is applied to a portion of the wiring ring or the like that protrudes from the groove, there is a possibility that the part may come off. However, in the fixing structure of this embodiment, the wiring 96 is completely accommodated in the groove formed by the step portion of the piston rod 86 and the piston 92, and there is no portion protruding outside the groove. There is no risk of coming off.

The operation of the striker 8 of the transmission operating booster having the above configuration will be described. When the select operation is performed, the striker 8 is moved on the shift shaft 4 in the axial direction by the select lever 80. At the time of this select operation, the engagement lever 84 provided on the shift shaft 4 has no influence. Further, when a shift operation is performed, the piston rod 86 and the engagement member 88 are moved by the operation of the power cylinder 10 to shift the shift shaft 4.
Of moving in a direction perpendicular to the axis O _1, the engaging member 88
The shift operation of the transmission is performed by rotating the shift shaft 4 and the striker 8 integrally via the engagement lever 84 connected to the transmission. In this embodiment, the same effects as those of the above embodiments can be obtained. Further, although the piston 92 and the piston rod 86 are formed separately, they can be firmly fixed, so that the operation of the striker 8 can be performed reliably and smoothly.

Next, a fourth embodiment will be described with reference to FIGS. FIG. 11 is a plan view showing a cross-section of a part of a transmission operating booster according to a fourth embodiment, and FIG. 12 is a cross-sectional view taken along line Aa-Aa in FIG. In this embodiment, the transmission upper case 102
A control valve 106 of the booster is disposed at right angles to the shift shaft 104 housed therein. The control valve 106 is operated via a control valve actuating means connected to a shift link mechanism (shift instruction operating force transmitting means) from a change lever (shift instruction operating means) in a driver seat (not shown). In addition, a power cylinder 110 for rotating a striker 108 provided on the shift shaft 104 is integrally provided in the upper case 102.

Here, first, a control valve operating means for transmitting a shift command operating force by operating a change lever (not shown), which is a shift command operating means, to the control valve 106 to operate it will be described with reference to FIGS. 13 will be described. A shift lever 112 is fixed to an end (right end in FIGS. 11 and 12) of the shift shaft 104 rotatably housed in the hole 102a of the upper case 102. This shift lever 112, the axis O ₁ and parallel to fulcrum pin 114 of the shift shaft 104 is fixed, an intermediate portion of the input transmission lever 118 is rotatably attached to the fulcrum pin 114. Although the input transmission lever 118 can rotate about the fulcrum pin 114 with respect to the shift lever 112, since the input transmission lever 118 is sandwiched between the head 114 a of the fulcrum pin 114 and the shift lever 112, It cannot move in the axial direction.

A cover housing 120 for covering the shift lever 112 and the input transmission lever 118 is provided at the end (right end in FIGS. 11 and 12) of the shift shaft 104 where the shift lever 112 and the input transmission lever 118 are provided. And is fixed to the upper case 102. With this cover housing 120. Dust and muddy water are prevented from entering these levers.

The input transmission lever 118 is connected to a shift link mechanism from a change lever (not shown) near an end (lower side in FIG. 12) opposite to the shift shaft 104 side. That is, a rod 124 is connected to one end of the input transmission lever 118 via a ball joint 122 and is fitted to the tip of a boot 126 attached to the opening 120 a of the cover housing 120. The end is screwed and connected to the joint member 128. A rod 130 of the shift link mechanism from the change lever is screwed and connected to the joint member 128. Since the shift link mechanism (the rod 130 at the end thereof) and the input transmission lever 118 are thus connected via the joint member 128, the connection operation is extremely easy.

A circular hole 104a is formed in the shift shaft 104, and a columnar input transmitting member 132 is rotatably fitted in the circular hole 104a. Tip portion 132a of input transmission member 132 located inside circular hole 104a (left end in FIGS. 11 and 12)
Has a small diameter, and a diametrically engaging pin 134 is inserted through and fixed to the small-diameter portion 132a at the distal end. The engagement pin 134 has a length that is substantially the same as or slightly shorter than the diameter of the cylindrical main body 132b of the input transmission member 132, and protrudes by approximately the same length on both diametric sides of the tip small-diameter portion 132a. I have. The protruding portions at both ends of the engagement pin 134 form a pair of valve mechanisms 106A, 106 described later.
B of the control valve 106 made of B
3 respectively.

The other end of the input transmission member 132 (the right end in FIGS. 11 and 12) is connected to the axis O _{1 of the} shift shaft 104.
A columnar engaging portion 132c eccentric to (the axis of the input transmitting member 132) is formed, and the cover housing 120 is formed.
Project in the direction of. On the other hand, the input transmission lever 11
At the end on the shift shaft 104 side (upper part in FIG. 12) of No. 8, an engagement hole 118a through which the cylindrical engagement part 132c of the input transmission member 132 penetrates is provided. As shown in FIG. 13, the engagement hole 118a of the input transmission lever 118
The input transmission lever 118 has a long hole extending in the longitudinal direction, and the shorter diameter side (the left-right direction in FIG. 13) has substantially the same diameter as the outer diameter of the columnar engaging portion 132c. Therefore, the columnar engaging portion 132c of the input transmitting member 132 is fitted to the short diameter of the engaging hole 118a of the input transmitting lever 118 without play.

The inner surface of the cover housing 120
At a position facing the cylindrical engagement portion 132c, a stopper portion 13 for receiving the tip of the cylindrical engagement portion 132c is provided.
5 are formed so as to protrude (see FIGS. 11, 12 and 14). The stopper portion 135 has a horizontally long oval concave portion 135a, and the columnar engaging portion 132c of the input transmission member 132 is fitted into the concave portion 135a with a gap. Therefore, the input transmission member 1
When the shaft 32 rotates in the shift shaft 104, the columnar engaging portion 132 c moves to the axis O _{1 of the} shift shaft 104.
While allowing a predetermined amount of rotational movement around
After coming into contact with the inner surface of the concave portion 135a of the stopper portion 135, further rotation of the input transmitting member 132 is restricted.

Next, the structure of the control valve 106 will be described with reference to FIG. 11, FIG. 15, and FIG. This control valve 10
6 is a pair of valve mechanisms 106A arranged in parallel up and down,
106B, is accommodated in the upper case 102, and is provided on one side of the shift shaft 104 (FIG. 11).
(Above) is oriented in a direction orthogonal to the axis O ₁ of the shift shaft 104. In this embodiment,
The control valve 106 is provided at a position adjacent to a power cylinder 110 described later.

The upper case 102 has an outer side (FIG. 15).
(Left side of FIG. 2) is formed with a large-diameter circular hole 102b and two upper and lower small-diameter circular holes 102c and 102d communicating with the inside thereof. The valve lifters 152 and 153 are respectively provided in the upper and lower small holes 102c and 102d with O-rings 152.
a, 153a so as to be slidable. Pin portions 152b, 153b formed at the distal ends of the pair of valve lifters 152, 153 are fixed to the distal small diameter portion 132a of the input transmission member 132 through slits 104b provided in the shift shaft 104. The engagement pins 134 are engaged with both ends, respectively.

The rear ends of the valve lifters 152 and 153 (FIG. 1)
5, a large-diameter circular hole 102b located on the left side of the sheet portion) side
Inside, a circular valve seat member 136 is inserted in an airtight manner by an O-ring 136a. Further, a plug 137 is fitted on the outside of the outside with airtightness similarly by an O-ring 137a on the outer periphery, and is prevented from coming off by a ring 138 fitted on the inner surface of the opening of the large-diameter circular hole 102b. . Circular through holes 136b, 136c are formed in the valve seat member 136 at positions corresponding to the two upper and lower small-diameter circular holes 102c, 102d, respectively. The circular through holes 136b, 136c are formed at the inner side ends thereof, respectively. Valve seat 14
4,145 are formed. Both circular through holes 136b,
The valve bodies 146, 147 are accommodated in the 136c, respectively, and the valve bodies 146, 147 are respectively attached to the valve seats 144, 147 by springs 148, 149 mounted between the valve bodies 146, 147 and the plug 137. It is urged in the 145 direction.

The center of the plug 137 has a through hole 13
7b is formed and connected to an air source (not shown).
The pressurized air from this air source passes through the through hole 137b of the plug 137 and the gap between the plug 137 and the valve seat member 136, and the air chambers (circular through holes) 136b and 136c containing the springs 148 and 149. Has been introduced within. The operating pressure chambers 164, 16 are provided on the outer circumference of the valve lifters 152, 153 on the valve seat member 136 side, respectively.
5 are formed, and each of the operating pressure chambers 164 and 165 is connected to an air passage 102 e, 1 formed in the upper case 102.
02f (see FIGS. 11 and 16), the respective pressure chambers 170a, 170b of the air cylinder 110 described later.
Is in communication with 154 is one air passage 102
This is a plug for closing the end of e. Further, exhaust passages 152c and 153c formed of an axial passage and a radial passage are formed inside the valve lifters 152 and 153, and the exhaust passages 152c and 153c are formed in the exhaust ports 155 formed in the upper case 102. Is open to the atmosphere.

The pair of valve mechanisms 106 A and 106 B constituting the control valve 106 are of one-valve and two-seat type, and are urged by valve seats 144 and 145 formed on the valve seat member 136 and springs 148 and 149. A supply valve is formed by the valve bodies 146 and 147, and an exhaust valve is formed by end portions (seat portions) of the valve lifters 152 and 153 inserted into the valve seats 144 and 145 with a gap therebetween and the valve bodies 146 and 147. Have been. And the valve lifters 152 and 153
Of the valve bodies 146 and 147 by the movement of the valve seats 144 and 14
5, the air is introduced from the air source into the air chambers 136 b and 136 c containing the springs 148 and 149 through the through holes 137 b of the plug 137 and the gap between the plug 137 and the valve seat member 136. Pressure air
The passages between the opened valve bodies 146, 147 and the valve seats 144, 145, the working pressure chambers 164, 165 and the air passage 10
It is sent to one pressure chamber 170a, 170b of the air cylinder 110 via 2e, 102f to operate the air cylinder 110.

When the control valve 106 is not operated (FIG. 1)
In state 5), the working pressure chambers 164 and 165 are provided with the gap between the outer peripheral surfaces of the valve lifters 152 and 153 and the valve seats 144 and 145, the distal end surfaces (seat portions) of the valve lifters 152 and 153, and the valve bodies 146 and 147. Gap, valve lifter 15
2, 153, and the like, and communicates with the exhaust port 155 of the upper case 102 via exhaust passages 152c, 153c and the like.

A spline 104d is formed on the outer periphery near the end of the shift shaft 104 opposite to the input transmitting portion (the right side in FIGS. 11 and 12) (see FIGS. 12 and 17).
Are fitted. Therefore, the striker 108 rotates integrally with the shift shaft 104 in the rotational direction and can move in the axial direction. An engagement projection 108b is provided on the striker 108 on the opposite side (upward in FIGS. 12 and 17) from the shift operation section 108a for meshing the gears of the transmission, and this engagement projection 108b is The striker 10 is engaged with an engagement member 174 fixed to a piston rod 172 of the power cylinder 110 to be described, and the power cylinder 110 operates.
8 rotates.

A power cylinder 110 for rotating the striker 108 by the output of the control valve 106 is provided integrally with the upper case 102. A cylinder chamber 170 is provided in the upper case 102, and a power piston 176 is fitted into the cylinder chamber 170 via a sealing member 176a so as to be able to move forward and backward, and partitions the inside thereof into two pressure chambers 170a and 170b. ing. One of the two pressure chambers 170a, 170b (the lower side in FIG. 11 and the right side in FIG. 17) is connected to the operating pressure chamber 164 of the upper valve mechanism 106A in FIG. 15 through the air passage 102e in the upper case 102. The other pressure chamber 170b is connected to the operating pressure chamber 165 of the lower valve mechanism 106B via the air passage 102f.

The piston 17 of the power cylinder 110
6 moves forward and backward in a direction orthogonal to the axis O ₁ of the shift shaft 104.
The engaging member 174 is fixed to a tip of a piston rod 172 integral with the piston 76. The engagement member 174 is provided with a long engagement hole 17 extending in the direction of the axis O ₁ of the shift shaft 104.
4a (see FIG. 11), and the striker 10
8 engaging projections 108b are formed in the elongated holes 17 of the engaging members 174.
4a. Therefore, the power cylinder 110
There When activated, the piston 176 integral with the piston rod 172 is moved back and forth to the axis O ₁ perpendicular direction of the shift shaft 104, the engagement member 174 is moved back and forth are fixed to the piston rod 172. Then, the engagement member 174
Engages with the engagement protrusion 108b to rotate the striker 108.

One end of a select lever 180 interlocking with a select link mechanism (not shown) is engaged with the striker 108 (see FIG. 12), and the striker 108 is operated in response to a select operation of a change lever. Move axially along the shift shaft 104. As described above, the engagement protrusion 108b provided on the upper portion of the striker 108 is fitted in the long hole 174a in the axial direction of the engagement member 174 so as to be movable in the axial direction of the shift shaft 104. The structure for performing the shift operation of the transmission does not affect this select operation.

The upper surface of the engaging member 174 is shown in FIG.
As shown in FIG. 2 and FIG. 17, it has a flat surface, and is arranged close to the ceiling inner surface 102g of the upper case 102. Therefore, the piston 176 (piston rod 1)
72) or when the engaging member 174 tries to rotate,
The upper surface of the engaging member 174 is the inner surface 10 of the upper case 102.
The rotation is restricted by contact with 2 g.

The operation of the transmission operating booster according to the above configuration will be described. When a shift lever (not shown) in the driver's seat is shifted, the operating force is transmitted to the input transmission lever 118 via a shift link mechanism (only the rod 130 at the end is shown).
18 is a fulcrum pin 114 fixed to the shift lever 112
About the axis O ₁ in a plane orthogonal to the axis O ₁ of the shift shaft 104.

At the upper end of the input transmission lever 118, FIG.
As shown in FIG. 3, a long engaging hole 118a is formed in the longitudinal direction, and the input transmitting member 13 is formed in the engaging hole 118a.
A cylindrical engaging portion 132c formed eccentrically with respect to the axis (the axis O ₁ of the shift shaft 104) at the end of the second shaft 2 is fitted without play in the width direction (short diameter direction). Therefore, when the input transmission lever 118 rotates, the input transmission member 132 rotates in the circular hole 104 a of the shift shaft 104.

When the input transmission member 132 rotates, the engagement pin 134 fixed to the small diameter portion 132a at the tip of the input transmission member 132 causes one of the valve lifters 152, 153 to rotate according to the rotation direction of the input transmission member 132. Press to retract. One of the valve lifters 152 and 153 moved by the engagement pin 134
6 and 147, the exhaust valve is closed, and the valve bodies 146 and 147 are separated from the valve seats 144 and 145. Then, the pressure air introduced from the air source into the air chambers 136b and 136c in which the springs 148 and 149 are accommodated is applied to one of the valve bodies 146 and 147 and the valve seat 14.
4, 145 through one of the working pressure chambers 16
, And one pressure chamber 170a of the power cylinder 110 via the air passages 102e and 102f.
170b.

When air is introduced into one of the pressure chambers 170a, 170b, the piston 176 and the piston rod 1
72 is actuated, the engagement projection 108b of the striker 108 fitted in the long hole 174a of the engagement member 174 is rotated by engagement with the engagement member 174, and the striker 10
8 is rotated in the shift direction to perform a shift operation. Further, the shift shaft 104 rotates with the rotation of the striker 108. Then, the fulcrum (the fulcrum pin 114, which is the center of rotation) of the input transmission lever 118 provided on the shift lever 112 moves in the shift direction, so that the rotation angle of the input transmission lever 118 with respect to the shift lever 112 decreases, and the non-operation Return to position. When the input transmission lever 118 and the shift lever 112 return to the inoperative position, the control valve 1
06 also returns to the inactive position and is held there. As described above, the operation of the transmission is controlled by following the movement of the input transmission lever 118 which rotates upon transmission of the operation of the change lever.

When the booster operates as described above, the pressures in the operating pressure chambers 164 and 165 are increased by the valve lifters 152 and 1.
Acts in a direction to return 53 to the inoperative position, and its acting force is
An input transmission member engaging pin 134, an input transmission member 132,
The force is transmitted as a reaction force to the change lever via the cylindrical engagement portion 132c, the input transmission lever 118, the shift link mechanism, and the like.

When the shift operation is completed and the change lever is released, the input transmission lever 118 and the control valve 106 return to the inoperative position, and the pressure in one of the pressure chambers 170a and 170b of the power cylinder 110 is reduced to the upper case. 10
2, the air passages 102e and 102f, the working pressure chamber 164,
165, valve lifters 152, 153 and valve body 146, 1
47, and through the exhaust passages 152c and 153c inside the valve lifters 152 and 153, the air is exhausted from the exhaust port 155 to the atmosphere.

During a normal shift operation, the transmission operating booster operates as described above. However, when the air source or the control valve 106 fails, the booster mechanism fails. When the input transmission member 132 is rotated by rotating the input transmission lever 118 via the shift link mechanism by operating the change lever, the power cylinder 11
No air is supplied to the zero pressure chambers 170a and 170b,
No boost operation is performed. In this case, further input transmission lever 118 is rotated, the cylindrical engaging portion 132c of the input transmission member 132 to rotate about the axis O ₁ of the shift shaft 104 is formed on the inner surface of the cover housing 120 The stopper 135 contacts the inner wall of the recess 135a. Then, the input transmission lever 1 is pivoted around the columnar engaging portion 132c abutting on the stopper portion 135 as a fulcrum.
18 rotates, and an operating force acts on the fulcrum 114 of the shift lever 112, so that the shift lever 112 rotates. That is, the input transmission lever 118 and the shift lever 112
Rotate integrally. Thus, the shift lever 112
Is directly rotated, the shift shaft 104 and the striker 108 are rotated, and the shift operation of the transmission is performed.

In the transmission operating booster having the above-described structure, the control valve 106 is provided in the upper case 102 by the shift shaft 1.
The power cylinder 110 is provided at right angles to the power case 04 and the power cylinder 110 is integrally provided in the upper case 102. Therefore, as compared with the case where the booster is separately provided outside the transmission as in the conventional configuration, the mounting space can be greatly reduced, and the independent transmission is not required. It is possible to reduce the size, weight, and cost of the operation booster. Moreover, the control valve 1
Since 06 is disposed at right angles to shift shaft 104, transmission loss of input from control valve operating means (input transmission member) 132 to control valve 106 can be reduced.

FIGS. 18 and 19 show a transmission operating booster according to a fifth embodiment. In the fourth embodiment, the control valve 106 is arranged close to the power cylinder 110. However, in this embodiment, the control valve 106 is arranged at a position close to the shift lever 112. Other configurations are the same as those of the fourth embodiment, and thus the same portions are denoted by the same reference characters and description thereof will be omitted.

In this embodiment, since the control valve 106 is arranged at a position close to the shift lever 112, the distance between the control valve 106 and the power cylinder 110 is large.
The operating pressure chambers 164 and 165 of the control valve 106 and the pressure chambers 170a and 170b of the power cylinder 110 are connected not by an air passage provided inside the upper case 102 but by external piping 182 and 183. By arranging the control valve 106 near the shift lever 112 in this way, the same effect as in the fourth embodiment can be obtained, and in addition, the length of the input
Since it is shorter than that of the embodiment, smoother operation can be performed.

Next, a transmission operating booster according to a sixth embodiment will be described with reference to FIGS. A shift shaft 204 is rotatably accommodated in the upper case 202. A shift lever 2 is attached to one end of the shift shaft 204 (the right end in FIGS. 20 and 21).
12 is fixed. A fulcrum pin 214 is attached to the shift lever 212, and an input transmission lever 218 is rotatably supported by the fulcrum pin 214. The input transmission lever 218 is pivotally mounted on the shift lever 212 with respect to the fulcrum pin 214. Rotate.

At the end (right end in FIGS. 20 and 21) of the shift shaft 204 provided with the shift lever 212 and the input transmission lever 218, a cover housing 220 for covering the shift lever 212 and the input transmission lever 218 is provided. It is provided and fixed to the upper case 202. A shift link mechanism from a change lever is connected near the end (lower end in FIG. 21) of the input transmission lever 218, as in the fourth embodiment.

The shift lever 21 of the shift shaft 204
An axial circular hole 204a is formed at the end on the second side. A small-diameter input transmission member 232 is provided in the circular hole 204a.
Are inserted with a gap therebetween, and the outer end thereof is fixed to the end of the input transmission lever 218 opposite to the end to which the shift link mechanism is connected (the upper end in FIG. 21).

A control valve 206 is arranged on both sides of the shift shaft 204 where the input transmission member 232 is inserted, at right angles to the shift shaft 204 and on the same axis. . This control valve 20
Reference numeral 6 includes a pair of one-valve and two-seat valve mechanisms 206A and 206B disposed on both sides of the shift shaft 204 so as to face each other.

The structure of the control valve 206 is shown in FIG.
And FIG. Valve holes 202 are provided on both sides of the shift shaft 204 of the upper case 202, respectively.
c, 202d are formed, and these valve holes 202c, 2d are formed.
The valve lifters 252 and 253 are slidably inserted through the O-rings 252a and 253a inside the 02d (the shift shaft 204 side). The small-diameter portions 252b and 253b of the valve lifters 252 and 252 are formed in radial holes 20 provided on both sides of the shift shaft 204.
4e and 204f to engage with both side surfaces of the input transmission member 232.

The valve seat members 236 and 237 are inserted and fixed to the opening sides of the two valve holes 202c and 202d, respectively. Further, plugs 238 and 239 are fitted and fixed to the outside. Valve seats 244, 2 are provided on the inner periphery of the valve lifters 252, 253 of the respective valve seat members 236, 237.
45 are formed. These valve seat members 236, 237
The valve bodies 246 and 247 are housed therein, and the plug 23
8 and 239 and the valve bodies 246 and 247 by springs 248 and 249 mounted between the valve bodies 246 and 247.
Are urged toward the valve seats 244 and 245.

The valve seat members 236 and 2 of the control valve 206
Air chambers 236b and 237b in which springs 248 and 249 inside 37 are housed are connected to an air source (not shown) through air introduction passages 202h and 202i formed in the upper case 202, so that compressed air is always supplied. Has been introduced. Each valve mechanism 206A, 20 of the control valve 206
6B includes valve bodies 246 and 247 and valve seat members 236 and 237.
The valve seats 244 and 245 form a supply valve, and the valve lifters 252 and 253 and the valve bodies 246 and 247 form an exhaust valve. When the control valve 206 operates,
One of the valve lifters 252 and 253 moves to separate one of the valve bodies 246 and 247 from the valve seats 244 and 245,
The pressure air in the one air chambers 236b and 237b is applied to the working pressure chamber 26 around the one valve lifters 252 and 253.
4, 265 through a power cylinder 21 described later.
0 is supplied to one of the pressure chambers 270a and 270b.

When not operating, the operating pressure chambers 264, 265 of the control valve 206 are connected to the valve lifters 252, 25
3 and an exhaust valve composed of valve bodies 246 and 247, exhaust passages 252c and 253c inside valve lifters 252 and 253,
The lever chamber 26 in the cover housing 220 passes through the circular hole 204 a in the axial direction of the shift shaft 204 and the gap between the shift shaft 204 and the input transmission lever 218.
8 and the exhaust port 220 of the cover housing 220
b to the atmosphere.

The power cylinder 21 is located below the control valves 206 (two valve mechanisms 206A and 206B) arranged on both sides of the shift shaft 204 in the upper case 202.
0 is provided. The power cylinder 210 is shown in FIG.
As shown in the figure, the switch is arranged at a position adjacent to the shift lever 212. One surface of the shift lever 212 (FIG. 21)
Is fixed to the left side of FIG. 2). 2 is provided on the surface of the shift lever 212 on the side opposite to the columnar engaging portion 286.
As shown in FIG. 3, when the input transmission lever 218 rotates by a predetermined angle or more with respect to the shift lever 212, the input transmission lever 218 comes into contact with the shift lever 212, and thereafter, a stopper portion 235 for integrally rotating the input transmission lever 218 and the shift lever 212 is provided. I have.

The power cylinder 210 is fitted in a cylinder hole 270 formed in the upper case 202 below the control valve 206 in parallel with the power piston 276 so as to advance and retreat in a direction perpendicular to the shift shaft 204. ing. In this embodiment, as shown in FIG. 22, a slot 27 into which a columnar engaging portion 286 of the shift lever 212 fits in the center of one power piston 276.
6a is formed, but instead of a single power piston, two power pistons are connected to the cylindrical engagement portion 286.
May be arranged so as to be clamped from both sides.

A spline 204b is formed on the end of the shift shaft 204 opposite to the input transmission side (left end in FIG. 21), and the striker 208 is moved in the axial direction. Are fitted so as to be movable and integrally rotate in the rotation direction.

The operation of the transmission operating booster having the above configuration will be described. When the input transmission lever 218 rotates about a fulcrum pin 214 provided on the shift lever 212 by operating the change lever, the input transmission lever 218 is rotated.
The circular hole 2 of the shift shaft 204
The input transmission member 232 inserted into the control valve 206 is connected to one of the valve lifters 252 and 253 of the control valve 206.
Press to retract. One valve lifter 252, 2
53 is retracted and one of the valve bodies 246 and 247 is
4,245, one air chamber 236b,
The pressure air in 237b passes through the working pressure chambers 264 and 265, and one of the pressure chambers 270a and 270 of the power cylinder 210
0b.

One pressure chamber 27 of power cylinder 210
0a and 270b are supplied with air to the power piston 2
The stroke of the shift lever 212 rotates through the cylindrical engagement portion 286 of the shift lever 212 engaged with the power piston 276. Shift lever 2
By the rotation of 12, the striker 208 fitted on the outer periphery of the shift shaft 204 rotates, and the shift operation of the transmission is performed. At this time, since the shift lever 212 rotates in the same direction as the rotation direction of the input transmission lever 218, when the shift lever 212 rotates by the operation stroke of the change lever, the control valve 206 returns to the non-operating position. Thus, the transmission is controlled following the operation of the change lever.

When the air source or the like has failed, even if the input transmission lever 218 is rotated by operating the change lever to operate the control valve 206, the power cylinder 210
Is not supplied, the power cylinder 210 does not operate. When the input transmission lever 218 rotates by a predetermined amount or more with respect to the shift lever 212, the input transmission lever 218 comes into contact with the stopper 235 of the shift lever 212, and the shift lever 212 is manually rotated. Also in the sixth embodiment, similarly to the fourth embodiment, the space for mounting the transmission operating booster can be greatly reduced, and a separate housing is not required. Weight, weight and cost can be reduced.

[0096]

As described above, according to the present invention, the power cylinder for rotating the striker of the transmission is provided integrally with the upper case, and the control for supplying and discharging the fluid pressure to and from the power cylinder is performed. Since the valve is provided integrally in the shift shaft of the transmission or in the upper case,
Since the mounting space can be significantly reduced and the housing can be omitted, the size, weight and cost can be reduced. Further, an engagement portion is provided on one of a striker and a shift shaft of the transmission, and an engagement member engageable with the engagement portion is provided on an output shaft of the power cylinder. Only when the shift operation is performed, the engagement member acts on the engagement portion to rotate the striker, so that the striker can be operated reliably and smoothly.

According to the second aspect of the present invention, the engaging portion is an engaging projection provided on the striker and projecting in a radial direction or in an axial direction of the shift shaft. The engagement member has an engagement hole into which the engagement protrusion is inserted, and an inner surface of the engagement hole of the engagement member is engaged with the engagement protrusion only when a shift operation of the shift command operation means is performed. As a result, the striker can be operated more reliably and smoothly.

According to the third aspect of the present invention,
The engaging portion is an engaging lever provided so as to protrude in the radial direction of the shift shaft, and since the engaging lever is always engaged with the distal end portion of the engaging member, the engaging portion is connected to the output shaft of the power cylinder. Since the shift shaft can be firmly connected, the striker can be operated more reliably and smoothly.

According to the fourth aspect of the present invention, since the guide portion of the engaging member is formed in the upper case, the piston or the like of the power cylinder rotates, and the engaging member is moved in the circumferential direction. Even if it is inclined, it is guided by the guide portion of the upper case, so that the shift operation is not affected.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cross section of a part of a transmission operating booster according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an enlarged view of a main part (control valve) of FIG.

FIG. 5 is a view in the direction of arrow D in FIG. 2;

FIG. 6 is a sectional view taken along line CC of FIG. 1;

FIG. 7 is a longitudinal sectional view showing a main part of a transmission operation booster according to a second embodiment.

FIG. 8 is a sectional view taken along line DD of FIG. 7;

FIG. 9 is a longitudinal sectional view showing a main part of a transmission operation booster according to a third embodiment.

FIG. 10 is a sectional view taken along line EE in FIG. 9;

FIG. 11 is a plan view showing a cross section of a part of a transmission operating booster according to a fourth embodiment.

FIG. 12 is a sectional view taken along the line Aa-Aa in FIG. 11;

FIG. 13 is a sectional view taken along the line Ba-Ba of FIG. 11;

FIG. 14 is a diagram showing an inner surface of a cover housing.

FIG. 15 is an enlarged sectional view taken along line Ca-Ca of FIG.

FIG. 16 is a view in the direction of the arrow Da in FIG. 11;

FIG. 17 is a sectional view taken along the line Ea-Ea in FIG. 11;

FIG. 18 is a plan view showing a cross section of a part of a transmission operating booster according to a fifth embodiment.

FIG. 19 is a sectional view taken along the line Fa-Fa in FIG. 18;

FIG. 20 is a plan view showing a cross section of a part of a transmission operating booster according to a sixth embodiment.

21 is a sectional view taken along the line Ga-Ga in FIG.

FIG. 22 is a sectional view taken along the line Ha-Ha in FIG. 20;

FIG. 23 is a sectional view taken along the line Ja-Ja in FIG. 20;

[Explanation of symbols]

 Reference Signs List 2 upper case 4 shift shaft 6 control valve 8 striker 8b, 8c engaging portion (engaging protrusion) 10 power cylinder 12 shift lever 18 control valve operating means (input transmission lever) 18a inclined portion 32 control valve operating means (input transmission member) 32b) Inclined grooves 36, 37 Valve seat members 44, 45 Valve seats 46, 47 Poppet valve 50 Input rod 52, 53 Valve lifter 60 Air chamber 64, 65 Working pressure chamber 70a, 70b Pressure chamber 72, 86 Piston rod 74, 82, 88 engaging member 74a, 82a engaging hole 76, 92 piston 84 engaging lever

Claims (5)

[Claims] 1. A transmission operating booster for boosting a shift command operating force transmitted from a shift command operating means via a shift command operating force transmitting means to shift a transmission. A power cylinder, which is provided integrally with the upper case and rotates a striker of the transmission, and a power cylinder which is provided integrally with the shift shaft of the transmission or in the upper case, and which is provided by the shift command operating means. A control valve that is operated by a command operation force to control the supply and discharge of fluid pressure to and from the power cylinder; and a control valve operation means that is connected to the shift command operation force transmission means and operates the control valve. An engaging portion is provided on one of a striker and a shift shaft of the transmission, and an engaging member engageable with the engaging portion is provided on an output shaft of the power cylinder. It said engaging member is a transmission operating booster, characterized in that rotating the striker acts on the engagement portion only when the shift operation the shift command operation means. 2. The engaging portion is an engaging protrusion provided on the striker and protruding in a radial direction or in an axial direction of the shift shaft, and the engaging member is configured such that the engaging protrusion is 2. An engagement hole to be inserted, wherein an inner surface of the engagement hole of the engagement member engages with the engagement protrusion only when a shift operation of the shift command operation means is performed.
3. The transmission operating booster according to claim 1. 3. The engaging portion is an engaging lever provided to protrude in a radial direction of the shift shaft, and a tip of the engaging member is always engaged with the engaging lever. The booster for operating a transmission according to claim 1, wherein: 4. The transmission operating booster according to claim 1, wherein a guide portion of the engaging member is formed in the upper case. 5. The transmission operating booster according to claim 3, wherein the engagement lever is a shift lever of the shift shaft.