JPH0720444Y2 - Booster for transmission operation - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to an improvement of a booster device for operating a transmission, which boosts an operating force by a pressure fluid such as air when operating a transmission such as an automobile. .

b. Conventional Technology A conventional power booster for operating a transmission will be described with reference to FIGS. 4 is a layout view of each element of the transmission operating mechanism, and FIG. 5 is an enlarged sectional view taken along line VV in FIG.

As shown in the figure, a casing 1 accommodating a shift rod 10 and shift levers 9 and 11 is arranged on a transmission 2. The casing 3 of the transmission operating booster 8 is attached to the end of the casing 1 and is arranged in parallel with the transmission 2. The lever 4 of the booster projecting from the side portion of the casing 3 is connected to a change lever 5 arranged at the driver's seat by a link mechanism. In FIG. 4, 6 is a select operation lever,
7 is a clutch.

The lever (hereinafter referred to as the first shift operation lever) 4 is
The lever (hereinafter referred to as a second shift operation lever) 9 that engages with the input side of the booster 8 arranged in the casing 3
And is integrally rotatably disposed with respect to the casing 3. The shift rod 10 is rotatably arranged with respect to the casing 1, one end of which faces the inside of the casing 3, and one end of which is engaged with the output side of the booster 8 (hereinafter referred to as a third shift lever). 11) is fixed. This shift rod 10 has a spline 12 in its center.
Is formed, and the shift lever 13 is attached to this spline 12.
Are fitted.

In FIG. 5, 14 is a select lever integrally connected to the select operation lever 6 in FIG. 4, and 15 is a shift fork of the transmission 2, which is engaged with each gear of the transmission 2. 3 shift forks 15 ₁ , 15
₂ , 15 ₃ are lined up.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, showing the structure of the booster 8. The booster 8 has a cylinder 16 formed in its casing 3,
A hollow piston rod 17 is slidably arranged in the cylinder 16, and the inside of the cylinder 16 is pressure chamber 19 and pressure chamber 18 by the piston 18.
It is divided into 20 parts. The operating rod 21 is slidably inserted into the hollow portion of the piston rod 17, and
21 holds a pipe 22 at one end thereof. The compressed air passage 23 formed in the pipe 22 communicates with a hollow portion 37 formed in the piston rod 17 at a port 24.

Inside the hollow portion of the piston rod 17, a pair of left and right floating valves 25 and 26 are arranged on both sides of the port 24.
A pair of left and right fixed valve seats 27, 28 fixedly supported by the piston rod 17 are arranged outside the 5, 26. Further, a pair of left and right valve lifters 29, 30 for operating the floating valves 25, 26 are arranged outside the fixed valve seats 27, 28. The floating valves 25 and 26 are urged toward each other outward by a spring 31 interposed therebetween, and are normally crimped to the fixed valve seats 27 and 28, respectively. Further, springs 32 and 33 are interposed between the fixed valve seats 27 and 28 and the valve lifters 29 and 30, respectively.
Are urged toward the outside, and their outside ends are abutted against the projecting portion 34 of the pipe 22 and the end portion 35 of the operating rod 21.

In FIG. 6, 36 is a compressed air supply port, 38 and 39 are hollow portions 37 of the piston rod 17 and pressure chambers 19 and 20 of the cylinder 16.
Ventilation holes that communicate with and 40, 41 are valve lifters 29,
An exhaust passage formed in a gap between the pipe 30 and the pipe 22, 42 an exhaust passage formed in the piston rod 17, and 43 and 44 operating rods 21
The exhaust passage is formed in the above, and 45 is an exhaust hole formed in the cover 46.

The piston rod 17 and the operating rod 21 are engaged with each other by a detent mechanism 47 as shown in FIG. In detail, the detent mechanism 47 has a recess 49 formed on the hollow side of a hollow arm 48 fixedly supported by the piston rod 17, and a ball 50 is loosely fitted in the recess 49. 21 side is urged. On the other hand, projecting pieces 52, 53 that sandwich this rod 21 between the operating rod 21
And a recess 54 is formed at the end of one protruding piece 52, and the ball 50 is fitted into the recess 54 so that the piston rod 17 and the operating rod 21 are engaged with each other. Further, the protruding piece 53 of the operating rod 21 is engaged with the second shift operating lever 9,
The hollow arm 48 of the piston rod 17 is engaged with the third shift operating lever 11.

This conventional transmission operating mechanism operates as follows. First, when the change lever 5 is selected, the select operation lever 6 is rotated by the operation force, and accordingly, the select lever 14 directly connected to the lever 6 is moved along the spline 12 of the shift rod 10 in FIG. Move to the left or right, and shift forks 15 ₁ , 15 _{2 of} transmission ₂
Matches any of 15 ₃

Next, when the change lever 5 is shift-operated, the first shift operation lever 4 is rotated by the operation force, and accordingly, the second shift operation lever 9 directly connected to the lever 4 is rotated, and the projecting piece 53. The operating rod 21 is displaced leftward or rightward in FIG. 6 via.

When the operating rod 21 is displaced to the right, for example, the pipe 22 fixed to the rod 21 is displaced to the right, and the valve lifter 29 is displaced to the right by being pushed by the protruding portion 34. When the valve lifter 29 is displaced rightward, the floating valve 25 is pushed rightward and separated from the fixed valve seat 27. As a result, supply port 3
6, the compressed air reaching the hollow portion 37 via the passage 23, the port 24, flows between the floating valve 25 and the fixed valve seat 27, further flows into the pressure chamber 19 of the cylinder 16 via the ventilation hole 38, Piston 18
Is pumped to the right.

Since the piston 18 is integral with the piston rod 17, the piston rod 17 also moves to the right as the piston 18 moves, and the hollow arm 48 fixed to the rod 17 moves to the right. The rightward movement of the hollow arm 48 is transmitted to the second shift operating lever 11, and the shift rod 10 shown in FIG.
Rotate. When the shift rod 10 rotates, the shift lever 13 rotates accordingly, and the shift fork 15 is operated in the forward direction or the backward direction.

As described above, in the transmission operating mechanism, the operating force of the change lever 5 is a light force required to open the floating valves 25 and 26, and compressed air is applied to the piston 18 by opening the floating valves 25 and 26. The operating force of the change lever 5 is boosted by operating the shift lever 10, and the output obtained thereby rotates the shift rod 10 so that the shift fork is moved through the shift lever 13.
Actuating 15.

In the booster 8 in the state where the shift operation is completed, the operating force of the change lever 5 is released so that the piston rod 17 and the operating rod 21 are located slightly to the right or left of the casing 3 in FIG. However, when the operation force of the change lever 5 is released, the positional relationship between the piston rod 17 and the operation rod 21 is restored to the state shown in FIG. 6 by the action of the detent mechanism 47. Therefore, the compressed air in the cylinder 16 is discharged to the outside from the ventilation hole 38 through the exhaust passages 40 and 42.

c. Problems to be Solved by the Invention As described above, in the conventional transmission booster, the booster itself becomes large, and it is usually used for medium- or large-sized automobiles, especially trucks. Has been applied as. On the other hand, in recent years, there has been an increasing tendency for the booster to be gradually adopted for small trucks with a loading capacity of about 2 tons.

However, the booster is structurally relatively large, and the mounting position in the vehicle is practically limited to the vicinity of the transmission because of the mounting space and mounting accuracy. For this reason, there is a problem in that the degree of freedom in designing for mounting the booster on the small truck or the like is extremely limited. At the same time, there was a problem that the output transmission mechanism and the peripheral structure of the booster became considerably complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to solve the above problems and provide a booster device for operating a transmission, which has a compact shape and can be easily mounted on a small vehicle such as a small truck. It is in.

d. Means for Solving the Problems The structure of the present invention for achieving the above-mentioned object is a cylinder body and a slidable arrangement in the cylinder body, and the cylinder body is provided with two pressure chambers. A partitioning piston, a hollow piston rod that is attached to the outer peripheral surface of the piston, and has an end connected to the transmission lever side, and a slidably disposed inside the piston rod, and an end thereof. Includes an operation rod connected to the change lever side, and a valve mechanism disposed in the piston rod and operated by the operation rod, wherein the relative displacement between the operation rod and the piston rod causes A booster for operating a transmission in which high pressure air is introduced into one of the pressure chambers through the valve mechanism and low pressure air is introduced into the other of the pressure chambers so that the piston rod follows the displacement of the operation rod. In the above configuration, the operating rod is provided with a low pressure air introducing passage introduced from one end side thereof and a high pressure air introducing passage introduced from the other end side thereof, and the operating rod connected to the change lever side. Of the piston rod and the end portion of the piston rod connected to the transmission lever side, each of which is projected in the radial direction with respect to the central axis thereof, and the respective directions around the central axis are mutually, The feature is that it can be changed arbitrarily.

e. Embodiment Hereinafter, a preferred embodiment of the present invention will be exemplarily described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a transmission operating mechanism, 2 is a transmission, 5 is a change lever, 7 is a clutch,
101 is a booster, 102 is a negative pressure inlet, and 103 is an atmosphere inlet. In the figure, the input end 104a of the booster 101 is connected to the change lever 5 via a link rod 105, and the output end 106a is connected to a shift lever 108 of the transmission 2 via a link rod 107.

2 and 3 are sectional views showing the structure of the booster 101. FIG. 2 is a sectional view when not operating, and FIG. 3 is a sectional view when operating in the direction A in FIG.

In FIG. 2, in the booster 101, a cylinder 116 is formed in a cylindrical casing 111 thereof, and a hollow piston rod 117 is slidably arranged in the cylinder 116. Are divided into a pressure chamber 119 and a pressure chamber 120. The input rod 112 is slidably inserted into the hollow portion of the piston rod 117,
An operation rod 121 fixed by a spring pin 113 is held at one end of the input rod 112. A negative pressure air passage 122 is formed in the input rod 112 and the operation rod 121, and an atmosphere passage 123 is independently formed from the other end of the operation rod 121. This atmosphere passage 123
Is communicated with a hollow portion 137 formed in the piston rod 117 at a port 124.

Inside the hollow portion of the piston rod 117, a pair of left and right floating valves 125 and 126 are arranged on both sides of the port 124, and the pair of floating valves 125 and 126 are attached to each other by springs 131 interposed therebetween. It is energized. Further, outside the pair of floating valves 125, 126, a pair of left and right fixed valve seats 127, 128 are slidably arranged in the hollow portion of the piston rod 117, and the pair of floating valves 125, 126 are normally provided by a spring 131. They are crimped to the fixed valve seats 127 and 128, respectively. The pair of fixed valve seats 127, 128 is fixed by a sliding ring 145 slidably arranged in the hollow portion of the piston rod 117 so that the piston rod 1 is fixed at a predetermined position in the hollow portion of the piston rod 117.
The output shaft 106 fixed to the end of 17 is pressed via a spring 146.

On both outer sides of the pair of fixed valve seats 127, 128, there are floating valves 125, 1
A pair of left and right valve lifters 129 and 130 for operating the 26 are slidably arranged. This pair of valve lifters 129,13
One of the 0 valve lifters 129 is arranged so as to be inserted between the operation rod 121 and one inner peripheral surface of the sliding ring 145. One end of the operating rod 121 is slidably held on the other inner peripheral surface of the sliding ring 145. Between the pair of valve lifters 129 and 130 and the fixed valve seats 127 and 128, springs 132 and 133 respectively interposed are urged in a direction in which the valve lifters 129 and 130 are separated from each other, and the outer ends of the valve lifters 129 and 130 project from the operating rod 121. It abuts against the portion 134 and the end 135 of the input rod 112.

An insertion hole 147 is formed at the input side end of the piston rod 117, and the input shaft 104 fixed by a fixing pin 151 is slidably inserted into the input rod 112. In addition, the input shaft 104 is provided with an input end 104a that projects in the radial direction with respect to the axis and a negative pressure inlet 102 that communicates with the negative pressure air passage 122 on the opposite side. Further, two guide grooves 148 that are parallel to the axis are formed on the input shaft 104, and guide pins 149 that are inserted and guided in the guide grooves 148 are fixed to the piston rod 117. Therefore, the input end 104a is displaced parallel to the axis line at a fixed angle position around the axis line. Reference numeral 150 denotes a rubber plate for preventing the guide pin 149 from falling off.

On the other hand, at the output end of the piston rod 117, the insertion hole 1
52 are formed. The insertion hole 152 is for inserting the above-mentioned valve mechanism into the hollow portion of the piston rod 117 when the booster 101 is assembled, and after inserting the valve mechanism, the output shaft 106 is screwed. An atmosphere passage 123 is formed along the axis of the output shaft 106, and an output end 106a protruding in the radial direction with respect to the axis and an atmosphere introduction port 103 communicating with the atmosphere passage 123 are arranged on the opposite side. Set up. A lock nut 153 is screwed onto the threaded portion 106b of the output shaft 106. Therefore, the screwing position of the output shaft 106 can be arbitrarily set around the axis, so that the direction of the output end 106a can be adjusted according to the connecting direction of the link rod 107 connected to the transmission 2. That is, the piston rod 117
The angle of the output end 106a can be arbitrarily set with respect to the direction of the input end 104a around the axis of.

In FIG. 2, 142 and 143 are ventilation holes of the fixed valve seats 127 and 128, 138 and 139 are also ventilation holes of the piston rod 117,
Hollow part 137 of piston rod 117 and pressure chamber 1 of cylinder 116
Communicate with 19,120 respectively. 140 and 141 are valve lifters 1
Negative pressure air passages are formed in the gaps between the operation rods 121 and 29, 130, and the passages 140, 141 communicate with the negative pressure air passages 122 via the ports 154, 155 formed in the operation rod 121, respectively.

When a first stopper portion 156 is formed on the inner surface of the input shaft 104 and the input shaft 104 is displaced in the direction of arrow A in FIG. 2,
The end side surface 117a of the piston rod 117 contacts the stopper portion 156. On the other hand, the second stopper 1 is attached to the outer surface of the input rod 112 that is fixed to the input shaft 104 and is displaced simultaneously.
57 is formed and the input shaft 104 is displaced in the direction of arrow B,
The inner surface 117b of the piston rod 117 contacts the stopper portion 157. These first and second stopper portions 156,15
7, the maximum displacement to the input shaft 104 can be restricted. The two guide grooves 1 provided on the input shaft 104
Predetermine the axial length of 48 and use the guide groove.
Both ends of 148 may function as the first and second stopper portions.

The booster 101 for operating the transmission of the present embodiment operates as follows.

When the link rod 105 is pushed in the direction of arrow A in FIGS. 1 and 2 by operating the change lever 5, the input end 104a
The end portion 135 of the input rod 112 integrally fixed to the input shaft 104 (the operation rod 121 is also fixed to the input rod 112 by the spring pin 113 and displaced together) presses the rear end portion of the valve lifter 130. Therefore, the valve lifter 130 moves forward against the spring 133 as shown in FIG. 3, and the tip end thereof displaces the floating valve 126 against the spring 131. Therefore, the negative pressure air passage 141 of the valve lifter 130 is closed by the floating valve 126 and the fixed valve seat 128 is opened. At that time, the atmosphere reaching the hollow portion 137 through the atmosphere introducing port 103, the passage 123 and the port 124 is introduced into the pressure chamber 120 of the cylinder 116 through the ventilation holes 143 and 139, and the piston 118 is pressure-fed leftward. Since the piston 118 is integrated with the piston rod 117, the piston rod 117 also moves to the left along with the movement of the piston 118, and the output shaft 106 and the output end 106a fixed to this rod 117 are moved to the left. . As a result, the shift lever 108 of the transmission 2 rotates via the link rod 107, and a predetermined gear shift is performed.

Next, by operating the change lever 5, the link rod 10
When 5 is pulled in the direction of arrow B in FIGS. 1 and 2, the protruding portion 134 of the operation rod 121 integrally fixed to the input shaft 104 of the input end 104a and the input rod 112 causes the rear end portion of the valve lifter 129 to move. Press. Thereafter, as in the case described above, the atmosphere is supplied to the cylinder 11
6 is introduced into the pressure chamber 119, the piston 118 is moved to the right, and the output shaft 106 and the output end 106a are moved to the right. As a result, the shift lever 108 of the transmission 2 is rotated and a predetermined gear shift is performed.

Next, when the operating force of the change lever 5 is released, the pair of valve lifters 129, 130 and the pair of idle valves 125, 126 are moved forward by the springs 131, 132, 133, respectively, as shown in FIG. 2, and are moved into the pressure chamber 120 or 119 of the cylinder 116. The introduced atmosphere passes through the ventilation holes 139 and 143 passages 141 from the port 155 of the operating rod 121, or passes through the ventilation holes 138 and 142 and passages 140 from the port 154 of the operating rod 121, respectively, to the passage of negative pressure air.
122, discharged to the outside through the negative pressure inlet 102, and the piston 1
The drive of 18 is stopped.

As described above, according to the booster for operating a transmission of the present embodiment, the operating force of the change lever 5 is a light force required to open the idle valves 125 and 126, and the idle valves 125 and 126 are sufficient.
By opening the air, the atmosphere is applied to the piston 118 to double the operating force of the change lever 5, and the shift lever 108 is rotated by the output obtained thereby, and a predetermined gear shift is performed.

In the above-described embodiment, as the pressure fluid for driving the piston 118 of the booster 101, one in which negative pressure air and the other atmosphere are used has been described, but this one negative pressure air is used as atmospheric or low pressure air. In addition, the other atmosphere can be used instead of the high pressure air.

The technique of the present invention is not limited to the technique in the above embodiment, and may be implemented by means of another aspect having the same function, and the technique of the present invention may be modified in various ways within the scope of the above-mentioned configuration. Can be added.

f. Effect of the Invention As apparent from the above description, according to the booster for operating a transmission of the present invention, the operation rod has a low-pressure air introduction passage introduced from one end side and a low-pressure air introduction passage introduced from the other end side. And an end portion of the operation rod connected to the change lever side and an end portion of the piston rod connected to the transmission lever side are respectively arranged in a radial direction with respect to a central axis thereof. Since the respective directions around the central axis line can be arbitrarily changed with respect to each other, the overall length of the booster in the central axis direction can be shortened, and the shape thereof can be made compact, so that it can be used for small vehicles. Is easy to install and the peripheral mechanism is simplified.

At the same time, since the direction of the connecting portion of the output end of the output shaft, which is one of the output transmission mechanisms of the booster, can be arbitrarily set in the radial direction around the output axis, even in a limited narrow space, The output transmission mechanism of the booster is simplified.

[Brief description of drawings]

1 to 3 show an embodiment of a booster for operating a transmission according to the present invention. FIG. 1 is a schematic configuration diagram of a transmission operating mechanism, and FIG. 2 is a booster when not operating. FIG. 3 is a vertical cross-sectional view of the booster in one operation, FIG. 4 is a schematic plan view of a conventional transmission operating mechanism, and FIG. 5 is a cross-sectional view taken along line VV of FIG. 6 and 6 are sectional views taken along the line VI-VI in FIG. 2 ... transmission, 5 ... change lever, 101 ... booster, 102
… Negative pressure inlet, 103… Atmosphere inlet, 104… Input shaft, 104a…
Input end, 105, 107 ... Link rod, 106 ... Output shaft, 106a ...
Output end, 108 ... shift lever, 112 ... input rod, 116 ...
Cylinder, 117 ... Piston rod, 118 ... Piston, 119,
120 ... Pressure chamber, 121 ... Operation rod, 122, 123 ... Passage, 153 ...
Lock nut.

Claims (1)

[Scope of utility model registration request] 1. A cylinder body, a piston that is slidably disposed in the cylinder body, and divides the cylinder body into two pressure chambers, and the piston is attached to an outer peripheral surface thereof.
A hollow piston rod whose end is connected to the transmission lever side, an operating rod slidably disposed in the piston rod, and whose end is connected to the change lever side; A valve mechanism that is disposed in the rod and is operated by the operating rod, and high pressure air is supplied to one of the pressure chambers through the valve mechanism by relative displacement between the operating rod and the piston rod. In the booster for operating a transmission in which low pressure air is introduced into the other of the pressure chambers so that the piston rod follows the displacement of the operating rod, the operating rod is introduced from one end side thereof. A low-pressure air introduction passage and a high-pressure air introduction passage introduced from the other end side are provided, and the end portion of the operation rod connected to the change lever side and the end portion The end portion of the piston rod connected to the speed lever side is provided to project in the radial direction with respect to the central axis thereof, and the respective directions around the central axis can be arbitrarily changed with respect to each other. Characteristic booster for transmission operation.