JPS5921320Y2 - Speed change operation device in transmission mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a speed change operation device in a gear transmission mechanism for traveling.

In gear transmission mechanisms, when multiple gears are required, the usual method is to make this possible by sliding switching using a combination of a main transmission gear and a sub-transmission gear. Moreover, in order to simplify the shifting operation, various methods have been implemented in which both switching mechanisms are linked together so that they can be operated by a single operating lever.

However, all of the conventional devices have drawbacks such as complicated linkage mechanisms, particularly complicated storage mechanisms within the transmission case, and difficult adjustments.

Therefore, this invention was implemented with the aim of obtaining an interlocking mechanism for main and sub-shift operations that can be configured extremely simply outside the case without complicating the mechanism housed inside the transmission case, and that is easy to adjust and install. This is what I did.

This will be explained below with reference to drawings of specific examples.

First, to explain the configuration of the transmission mechanism, A is horizontally supported by the main shaft in a rotatable manner on the transmission case 1, one end protrudes outside the case 1, and the engine (not shown) is attached to the protrusion. The passive pulley 2 that receives the power of A slide gear 6 is fitted so as to be slidable only in the axial direction, and is selectively slid to each shift position by a main shift fork 7.

B is a second shaft, and this shaft B has 3rd and 4th speed gears 8 that can mesh with the large gear 4 of the main transmission slide gear 6, 1st and 2nd speed gears 9 and gears 10 that can mesh with the small teeth 5, respectively. The shaft B is fixed in the direction of rotation, and the rotating direction is the same as the second shaft B. One end of this shaft B is made to protrude into the brake housing E formed on the side of the case 1, and the protrusion is operated. A brake device 40 operated by device 39 is installed.

C is an auxiliary transmission shaft that constantly meshes with the gear 10 of the second shaft B described above, and has a gear 11 fixed to the shaft end that can mesh with the small teeth 5 of the main transmission slide gear 6 of the main shaft A. An auxiliary transmission slide gear 14 having a gear part 12 and a gear part 13 is fitted on the side so as to be slidable only in the axial direction, and both toothed parts 12 and 13 of this auxiliary transmission slide gear 14 are connected to the auxiliary transmission fork. By changing the position at 15, it is possible to selectively engage the large and small tooth portions 17 and 18 of the two-stage passive gear 16 supported in an idling state at the center of the side clutch shaft.

Two-stage passive gear 16 loosely attached to the center of the side clutch shaft
Clutch engaging portions 19a, 19b are provided on the sides of the fitting portion, and clutch engaging portions 19a, 19 are provided on both outer sides.
A side clutch gear 21a has clutch engagement teeth 20a, 20b that engage and disengage from the side clutch gear 21a.

21b is fitted loosely.

These side clutch gears 21a, 21b are always connected to the clutch 19 by side clutch springs 22a, 22b.
a, 20a, 19b, 20b are energized to be engaged, and the clutch is disengaged by the side clutch forks 23a, 23b using the spring 22.
side clutch gears 21 a, 21 against a, 22b
The structure is such that the cutting is performed by moving the part b outward.

Brake claw portions 24 and 24' are provided on the outer periphery of the outer end of each side clutch gear 21a and 21b, and this claw portion 2
4 or 24' is the side clutch gear 21a, 21
By sliding in the cutting direction of b, the fixed brake pawls 25 and 26 installed on the wall of the transmission case 1 can be engaged and disengaged, and the clutch teeth 20a,
The gear portion integrated with 20b is always meshed with the final gear 29.30 fitted on the left and right axles 27.28, and the left and right axles 27.28 have final cases 31, 32 extending left and right from the mission case 1. The drive wheel bodies 33 and 34 are fixed to the outer ends of the drive wheels.

Next, to explain the configuration of each gear shift operation mechanism, the transmission case 1 is constructed by aligning a body 35 with a regular rest 36 and tightening and fixing it with tightening bolts 37. Side clutch fork 22a, 22 on the wall part
b and the auxiliary speed change fork 15 are pivotally supported, and a main speed change operation mechanism 38 is installed in the upper end opening.

In other words, the seat body 43 is fixed to the upper end opening 41 of the mission case 1 with the main gear shift guide plate 42 interposed therebetween.
A ball body 46 fixed to the main shift lever 45 is fitted into and supported by a spherical seat 44 formed at the upper end of the seat body 43, so that the main shift lever 45 swings about the rotation center point P. The leading end of the main shift lever 45 inserted into the case 1 is fitted into the main shift slide pin 46 which is horizontally supported above and behind the main shaft within the case 1 so as to be able to change its axial position. The outer end of the main shift fork 7 is fitted into the engagement groove of the mounted main shift fork 7, and the outer end is fitted into a connecting fitting 47, and is integrally connected with the main shift operating lever 48, which is fitted into the connecting fitting 47 from above, by a fixture 49. The main shift operating lever 48 passes through the guide groove 51 of the main shift latch 50 and extends in a curved manner to the operating hand portion, and a grip portion is attached to the tip thereof.

The guide groove 51 of the shift latch 50 has a rectangular opening as shown in FIG. However, since the auxiliary transmission slide gear 14 is slidably selected by the operation in the front-rear direction (opening direction) (this interlocking relationship will be described later), RlN is provided at one peripheral portion in the longitudinal direction of the opening guide groove 51. -1-N-3 is displayed, and R2-N-2-N-4 is displayed in the other peripheral area.

A sub-shift operation mechanism is interlocked with the main shift operation lever 48, and this interlock is configured as follows.

In other words, install the mounting legs 52 and 52 on the outer surface of the mission case 1 on the opposite side from where the passive pulley 2 is installed.
．． The upper end of the upper fulcrum bracket 54 individually identified by 53 is located above the rotation center point P of the main shift lever 45, and the upper fulcrum bracket 55 is rotated with the rotation center Q on the iron part. Freely supported.

This upper fulcrum metal fitting 55 is formed into a bell crank with a shape of a bell crank when viewed from the side with the rotation center Q as the fulcrum, and its short arm portion 56 is extended further upwards than the rotation center Q, and the end portion is An engaging arm portion 57 is bent inward to connect with the main shift operating lever 48, an engaging elongated hole 58 is formed in the arm portion 57, and the main shift operating lever 48 is inserted into the elongated hole 58. Insert it and connect it with this.

(The contact point of the operating lever through this elongated hole becomes the sub-shift operating point R.) The other long arm 59 is extended rearward from the rotation center point Q, and has a pivot pin 60 at its tip. The upper end fitting 61 of the sub-shift operation link is not pivotally supported on the pivot pin 60, and the connection between the upper end fitting 61 and the link rod 62 is constructed by interposing a screw type adjustment mechanism 63. .

The lower end of the link rod 62 is connected to the side clutch fork 2.
Inner than the operating mechanism 63 that operates 2a, 22b,
That is, it extends toward the case 1 side, and its distal end is rotatably connected to the distal end of the operating arm 65 of the operating body 64 of the sub-transmission fork 15.

To explain the operation of the device of the present invention constructed in this way, the main shift operation lever 48 is in the right side two-knee l-ral position in the state shown in FIG. 2 (the position shown by the solid line in FIG. 5);
The auxiliary transmission slide gear 14 is located at the position of the imaginary line, and the gear portion 12 is connected to the canine tooth portion 1 of the passive gear 16 connected to the side clutch shaft.
8, but even if the main shaft A receives power from the engine, it simply rotates and does not transmit power to others.

From this state, when the main shift operating lever 48 is moved to the right in the drawing and set to the position ■ of the guide groove 51 of the shift latch 50, the tip of the main shift lever 45 swings around the rotation center point P, Since the transmission fork 7 is moved, the main transmission slide gear 6 moves to the left, and the canine toothed portion 4 moves to the left.
During this movement, the main shift operating lever 48 meshes with the 3rd and 4th speed gears 8 of the shaft B, but only slides within the engagement elongated hole 58 of the engagement arm 57 and does not move the upper fulcrum metal fitting 55. The position of the variable speed slide gear 14 remains in the meshed state.

Therefore, the power of the main shaft A is transferred to the canine toothed portion 4 of the main shaft slide gear.
3rd and 4th speed gear 8, gear 10, fixed gear 11 of sub-shift shaft C
．． The power is transmitted to the gear portion 12 of the auxiliary transmission slide gear and the large tooth portion 18 of the passive gear 16 around the side clutch shaft, and rotates the passive gear 16.

At this time, the clutch engaging portions 19a, 19b of the passive gear 16 are connected to the engaging tooth portions 2 of the side clutch gears 21a, 21b.
0a and 20b are engaged, the power of the passive gear 16 is transmitted to the left and right final gears 29 and 30 via the side clutch gears 21a and 21b, and the axle 2 fitted with the final gears 29 and 30 is transmitted to the left and right final gears 29 and 30.
7.28 is rotated, so the drive wheel body 33, 3 at the outer end of the axle
4, and the aircraft will be propelled in 3rd gear.

When attempting to turn to either side while the aircraft is moving, the side clutch fork 23a on the desired side
When activated by the operating mechanism 63, the side clutch gear 21a slides outward on the side clutch shaft to release the clutch engagement 19a, 20a, and the transmission is stopped and the axle on the inside of the turn is moved. 27 is in an idle state, so the vehicle turns in that direction in the third gear state, and when trying to make this turn a sharp turn, the side clutch gear 21a is held outward by the operating mechanism 63. When the clutch gear 21a is moved as shown in FIG. This makes it possible to turn with an extremely small turning radius.

From this state of operation to other high speeds,
For example, when switching to 4th gear, move the main shift operating lever 48 from the ■ speed position to the ■ speed position within the guide groove 51 of the shift latch 50. The upper support metal fitting 55, which is in contact engagement with the engagement elongated hole 58 of
9 swings, and the link rod 62 connected thereto is moved in the direction of arrow C, and the actuating arm 65 connected thereto swings to move the auxiliary transmission fork 1 through the actuating body 64.
Move 5.

Therefore, the sub-transmission slide gear 14 also slides on the sub-transmission shaft C as the fork 15 moves, and the tooth portions 12 and 1
8 is disengaged, and the teeth 13 of the auxiliary transmission slide gear 14 and the small teeth 17 of the passive gear 16 are brought into mesh. At this time, the main transmission fork 7 at the tip of the main transmission lever 45 is engaged. However, this movement is only a slight movement in the direction perpendicular to the sliding direction of the fork within the engagement groove, so the main transmission slide gear 6 remains as it is and does not move at all.
■You can get into a state of wandering.

Also, speed changes to the other 1st and 2nd speeds, reverse 1st speed, and reverse 2nd speed can be made by moving the main shift operating lever 48 in the left-right and front-back directions in the same manner as described above. Since the desired speed can be achieved by operating the variable speed slide gear 14, a detailed explanation thereof will be omitted.

However, in the case of reverse movement, the small teeth 5 of the main transmission slide gear 6 mesh with the fixed gear 11 of the auxiliary transmission shaft C, and depending on the position of the auxiliary transmission slide gear 14 at this time, reverse 1st speed and reverse 2nd speed At this speed, the second shaft rotates at the same time, but all the other gears fixed to this shaft are inevitably disengaged, so there is no problem.

The gear transmission mechanism of the present invention is configured and operates as described above, but in particular, in the transmission operating device in which the switching operation of the main transmission and the switching operation of the auxiliary transmission are performed by a single operation lever, the transmission A member extending from the side opposite to the side where the passive pulley is installed on the outside of the case is positioned above the main shift lever, and an upper fulcrum metal fitting having a short arm part and a long arm part is rotatably attached to the member. The short arm part is provided with an engagement elongated hole into which the main gear shift lever is inserted, and the long arm part is pivotally supported by an upper end metal fitting connected to a link rod for auxiliary gear shift operation to support the upper fulcrum metal fitting. By configuring the operating link mechanism for the sub-shift switching operation, the operating link mechanism is connected to the intermediate portion of the main shift operating lever above the connecting fitting between the main shift lever and the main shift operating lever, and the main shift operation is performed. By rotating the lever forward, backward, left, and right, it was possible to perform main and sub-shift operations with a single operation. Although the structure allows the auxiliary shift operation link mechanism to engage with the middle part of the operating lever above the connecting fitting between the main shift lever and the main shift operating lever, the link mechanism can be easily installed without complicating the device stored in the transmission case. The mechanism can be easily attached and removed as an attachment to the middle part of the main gear shift control lever, and from models with a fixed auxiliary gear shift to those that require a auxiliary gear can be easily replaced outside the transmission case. It has excellent features that allow it to be used in many ways.

Further, since the support member for the sub-shift operation link is provided in a portion with less related mechanisms on the outside of the transmission case on the side opposite to the side where the passive Booneau is installed, there is an effect that its attachment and adjustment can be performed extremely easily.

Furthermore, the related engagement between the main shift operating lever and the sub-shift operating link mechanism is located above the part where the main shift operating lever is mounted, so the installation operation for the related engagement is simpler and easier. They can also produce certain effects together.

[Brief explanation of drawings]

The drawings illustrate a specific example of the present invention, and FIG. 1 is an overall side view of a power transmission mechanism implementing the device of the present invention, and FIG. 2 is a sectional view of the power transmission developed to show details of the power transmission mechanism. ,
3 is a partial rear view taken in the direction of the arrow in FIG. 1, FIG. 4 is a partial plan view of the connecting portion between the main shift operating lever and the sub-shift operation link mechanism, and FIG. 5 is a plan view of the shift latch. 1...Mission case, A...Main shaft, 6...Main transmission slide gear, 7...Main transmission fork, C...
Sub-transmission shaft, 14... Sub-transmission slide gear, 27.28
... Axle, 33° 34... Drive wheel body, 45... Main gear shift lever, 47... Connection fitting, 48... Main gear shift operation lever, 50... Gear shift latch, 51... Guide groove, 5
4... Upper fulcrum bracket, 55... Upper fulcrum metal fitting, 56
...Short arm part, 57...Engagement arm part, 58...Engagement long hole, 59...Long arm part, 61...Upper end metal fitting, 62...
...Link rod, 64...Operating body.

Claims (1)

[Scope of utility model registration request] In a gear shift operating device in which the switching operation of the main gear and the switching operation of the auxiliary gear are performed using a single operating lever, a member extending from the side opposite to the side where the passive pulley is installed on the outside of the transmission case is attached to the main gear shift lever. An upper fulcrum fitting having a short arm portion and a long arm portion is rotatably supported on the member, and the short arm portion is provided with a retaining elongated hole into which the main gear shift lever is inserted. , an upper end metal fitting connected to a link rod for a sub-shift operation is pivotally supported on the long arm, and the upper fulcrum metal fitting is configured as an operating link mechanism for an auxiliary gear-shift switching operation, so that the operating link mechanism is configured as a main link mechanism. By connecting the gear shift lever to the middle part of the main gear shift operating lever above the connecting fitting between the gear shifting lever and the main gear shifting operating lever, the main gear shifting operation and the sub shifting operation can be performed in one operation by rotating the main gear shifting operating lever back and forth and left and right. A structure for speed change operation in a transmission device, characterized in that