JP2001289319A - Booster for operating transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a booster for operating a transmission and reduce its weight to reduce cost and simplify a structure of a control valve 6 to operate it securely and smoothly. SOLUTION: This booster for operating the transmission is provided with a power cylinder 10 provided integrally in an upper case 2 of the transmission to turn a striker 8, the control valve 6 provided in a shift shaft 4 to operate by a shift gear command operation force from a change lever and control the supply and exhaust of air pressure to the power cylinder 10, and a control valve operation means connected to a link mechanism for shift to operate the control valve 6. The control valve 6 has a pair of valve mechanisms 6A, 6B provided in opposition on the same shaft in the shift shaft 4, and the control valve operation means has an input transmission member 32 provided in the shift shaft 4 so as to be movable in the axial direction and an input rod 50 whose one end is connected to the input transmission member 32 by passing through both valve mechanisms 6A, 6B. When the input transmission member 32 moves, either of the valve mechanisms 6A, 6B is opened by the input transmission member 32 or the input rod 50.

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 in which the structure of the control valve is simplified and the control valve can operate smoothly and reliably.

[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 integrally provided in an upper case of the transmission, for rotating a striker of the transmission, and a power cylinder provided in a shift shaft of the transmission, and A control valve that is operated by a shift command operating force from an operating means to control supply and discharge of fluid pressure to and from the power cylinder; and a control valve actuated to the shift command operating force transmitting means for operating the control valve. And the control valve further comprises a pair of opposed valve mechanisms provided coaxially in the shift shaft, and the control valve actuating means includes a shaft in the shift shaft. direction An input transmission member which is movable, in which the one end portion through the pair of valve mechanism is characterized in that a control valve actuating member coupled to the input transmission member.

According to a third aspect of the present invention, in the transmission operating booster, the control valve is disposed in a valve hole formed in the shift shaft. The valve is fixed by locking a locking member inserted into the valve hole from outside the valve seat member to the shift shaft.

Further, according to a fourth aspect of the present invention, in the transmission operating booster, a radial hole penetrating the wall surface of the shift shaft is aligned with the radial hole in the axial direction so that the upper case is aligned with the radial hole. The formed radial hole forms a part of the fluid passage of the control valve, and further has an outer peripheral surface where the radial hole of the shift shaft opens, and a radial hole of the upper case. An annular groove is formed on at least one of the inner peripheral surface and the inner peripheral surface.

According to a fifth aspect of the present invention, there is provided the transmission operating booster, wherein the control valve actuating means is rotatably supported at an intermediate portion by a shift lever fixed to the shift shaft, and one end is provided at the one end. An input transmission lever is engaged with the input transmission member, and the other end has an input transmission lever connected to the shift command operation means, and a cover for covering the shift lever and the input transmission lever is provided on the upper case.

According to a sixth aspect of the present invention, there is provided a transmission operating booster, wherein discharge chambers are provided axially outside of the two valve mechanisms provided coaxially and opposed to each other. The discharge chamber is connected by a connection passage formed in the control valve actuating member, and further, a communication passage communicating with one of the discharge chamber and a lever chamber partitioned by the cover and the upper case is provided on the shift shaft. Provided,
Further, an exhaust port for communicating the lever chamber with the atmosphere is formed in the cover.

According to a seventh aspect of the present invention, there is provided the transmission operating booster, wherein the cover has an opening for connecting the input transmission lever and the shift command operating force transmitting means, and the opening is provided in the opening. A connection member for connecting the input transmission lever and the shift command operation force transmission means is attached to a distal end portion of the attached boot.

[0018]

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, an input transmission structure for transmitting a shift command operating force by operating a change lever (not shown) as a shift command operating means to the control valve 6 will be described with reference to FIGS. 1 will be described with reference to FIG. 3 which is a cross-sectional view taken along line BB. The end of the shift shaft 4 (FIG. 1)
And a shift lever 12 is fixed to the right end of FIG. 2). This shift lever 12, the axis O ₁ and parallel to the fulcrum pin 14 of the shift shaft 4 is fixed, the input transmission lever 18 via the spacer 16 is rotatably attached to the fulcrum pin 14. 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 (shift command operation force transmission means) from a change lever (not shown) near an end farther from the shift shaft 4 (lower side in FIG. 2). ing. 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. A rod 30 of a shift link mechanism from the change lever 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 the control valve 6 in an enlarged manner) is formed inside the shift shaft 4, and a control valve 6 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.

On the lower surface (lower side in FIG. 2) of the input transmission member 32 on which the shift lever 12 and the input transmission lever 18 are mounted, an inclined groove 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, 45 are formed on the inner peripheral surfaces near the ends of the two valve seat members 36, 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 as a control valve actuating member is provided at the front end of the input transmission member 32 inside the valve hole 4a.
Are fixed by spring pins 51. Inside the input rod 50, an internal passage (connection passage) 50a penetrating in the axial direction is formed. The axial internal passage 50 a connects the exhaust chambers 84 and 85 described later to form an exhaust passage for the control valve 6. The poppet valves 46 and 47 are pressed on the outer periphery of the input rod 50 and outside the pair of poppet valves 46 and 47, respectively, to press the valve seat 4
Valve lifters 52 and 53 that are separated from the seats 4 and 45 are slidably fitted. When the valve lifters 52 and 53 are not operated, one of the valve lifters 52 (the left side in the drawing) is stopped by being hit by a spring 54 and hitting a ring (engaging member) 58 fitted to the end of the input rod 50. The other valve lifter 53 (right side in the figure) is pushed by the spring 55 and hits the distal end surface of the input transmission member 32 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. A control valve 6 having a pair of valve mechanisms 6A and 6B disposed on the same axis to face each other. The input transmission lever 18
When the input transmission member 32 moves in the axial direction of the shift shaft 4 due to the rotation of, one of the valve mechanisms 6A and 6B is opened. That is, when the input transmission member 32 moves in the axial direction,
One of the valve lifters 52, 53 is pushed by the distal end surface of the input transmission member 32 or the ring 58 fixed to the input rod 50, and one of the poppet valves 46, 47 is pushed.
Is released from one of the valve seats 44, 45, thereby opening one of the valve mechanisms 6A, 6B.

A chamber (air supply chamber) in which a pair of poppet valves 46 and 47 inside the valve seat members 36 and 37 are housed.
60 is connected to an air source 63 via an air pipe 62. Further, each of the operating pressure chambers 6 formed around the valve lifters 52, 53 located outside the two valve seat members 36, 37.
4 and 65 are power cylinders 1 described later, respectively.
0 are connected to two pressure chambers 70a and 70b (see FIGS. 1 and 6). Further, each of the valve lifters 52, 5
3, the exhaust chambers 84, 85 of the respective valve mechanisms 6A, 6B.
Are connected by the internal passage 50a of the input rod 50, and are open to the atmosphere as described below.

When the control valve 6 is not operated, the working pressure chambers 64 and 65 are provided with gaps between the outer peripheral surfaces of the tip 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. Gaps between the end surfaces of the poppet valves 46 and 47, spaces on the inner peripheral side of the end portions of the valve lifters 52 and 53,
Radial holes 50b and 50c of the input rod 50, an internal passage 50a in the axial direction of the input rod 50, a radial hole 50d formed on the input transmitting member 32 side of the input rod 50, and a radial direction of the distal end of the input transmitting member 32. The chamber communicates with a chamber (lever chamber) 68 in the cover housing 20 through the hole 32c, the chamber 66 around the distal end of the input transmission member 32, the radial hole 4c of the shift shaft 4 (see FIG. 2), and the like. An exhaust port 20b formed in the cover housing 20 is open to the atmosphere. Therefore, in the control valve 6, a supply valve is constituted by the poppet valves 46 and 47 and the valve seats 44 and 45 of the valve seat members 36 and 37, and the valve lifters 52 and 53 are provided.
And the poppet valves 46 and 47 constitute an exhaust valve.
This is a one-valve, two-seat control valve.

Here, the shift shaft 4 of the control valve 6
A method of assembling the components will be described. First, the input rod 5
0, the spring 48, the poppet valves 46 and 47, the valve seat members 36 and 37, the springs 54 and 55, and the valve lifter 5
2 and 53 are assembled, a ring (engaging member) 58 is fitted to the tip of the input rod 50, and fixed by a C ring 59. After fitting the cylindrical member 38 and the locking member 40 to this sub-assembly, the other end of the input rod 50 is inserted into the cylindrical portion 32d at the tip of the input transmission member 32, and the spring pin 51 is pressed and fixed. In this state, it is inserted into the valve hole 4a of the shift shaft 4, and the valve seat members 36, 37
Input transmitting member 3 for positioning the locking member 40
With the 2 pushed in, the pins 42 are pressed into the radial holes of the locking member 40 from both sides of the radial holes of the shift shaft 4 to fix the valve seat members 36, 37 and the like to the shift shaft 4.
In this way, the pin 42 is inserted through the locking member 40 so that the control valve 6
The control valve 6 can be securely and easily fixed to the shift shaft 4 by fixing the above members.

Thereafter, both ends of the pin 34 are pressed into the radial holes of the shift shaft 4 and fixed.
The shift shaft 4 and the input transmission member 32 are connected by inserting the transmission shaft 4 into the radially long hole 32 a of the input transmission member 32.

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 of the pressure chambers 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).

[0035] 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 engaging 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 1 provided on the opposite side (upper side in FIG. 2) of the input transmission lever 18 from the side connected to the shift link mechanism.
Because 8a is rotated, the engagement position of the inclined portion 18a of the input transmission lever 18 and the inclined groove 32b of the input transmission member 32 is changed, input transmission member 32 is moved in the axial O ₁ direction of the shift shaft 4.

When the input transmission member 32 moves in the axial direction of the shift shaft 4, the engagement member 58 fixed to the front end face of the input transmission member 32 or the input rod 50 causes the input transmission member 32 to move.
One of the valve lifters 52, 53 is pressed and moves, and abuts against one of the poppet valves 46, 47, and the one of the poppet valves 46, 47 is moved to one of the valve seats 4 of the valve seat members 36, 37.
Separate from 4,45. Then, the pressure air introduced from the air source 63 into the air supply chamber 60 is introduced into one of the operating pressure chambers 64, 65 through the gap between the poppet valves 46, 47 and the valve seats 44, 45. , Air piping 78, 79
Through one of the pressure chambers 70a, 70
0b.

When air is introduced into one of the pressure chambers 70a, 70b, the piston 76 and the piston rod 72 operate, and the engaging projection of the striker 8 fitted in the long 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 inoperative 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 position, and the pressure chambers 70a, 70
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, but 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.

Next, a transmission operating booster according to a second embodiment will be described with reference to FIGS. 7 and 8. FIG. In the first embodiment, the one-valve two-seat control valve 6 including the poppet valves 46 and 47 is used. In this embodiment, a spool valve-type control valve 106 is used.
Since other configurations are the same as those of the above-described embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.

An axially extending valve hole 4a is formed inside the shift shaft 4 housed in the upper case 2, and a control valve 106 is housed in the valve hole 4a. This control valve 106 is composed of two spool valve type valve mechanisms 106A, 106 which are arranged on the same axis to face each other.
06B. A step 4b is formed near the bottom of the valve hole 4a, and is fixed by a pin 142 to the disc-shaped stopper member 170 abutting the step 4b and to the opening side (the right side in the figure) of the valve hole 4a. The control valve 106 is fixed between the locking member 140 and the locking member 140.

The control valve 106 is provided between the disc-shaped stopper member 170 and a second disc-shaped stopper member 172 disposed inside a locking member 140 fixed to the opening side of the valve hole 4a. A pair of valve sleeves 17 fixed to
4,175 and the respective valve sleeves 174,175
And a pair of valve spools 176 and 177 respectively housed therein so as to be able to move forward and backward.

The pair of opposed valve sleeves 17
The inner peripheral surfaces of the 4,175 are stepped holes in which small holes 174a, 175a having small inner diameters are formed on the inner side (sides where the two meet) and large diameter holes 174b, 175b are formed on the outer side. . These valve sleeves 174, 1
75 accommodates valve spools 176 and 177, respectively. These valve sleeves 176, 177
Are small-diameter portions 176a and 177a having small outer diameters at portions located on the inner side (opposite sides), and large-diameter portions 176b and 177b having larger outer diameters at the outer side.

The inner surfaces of the small diameter holes 174a, 175a of the valve sleeves 174, 175 and the small diameter holes 174a, 175a,
There is a slight gap between the small-diameter portions 176a and 177a of the valve spools 176 and 177 located inside the 175a, and the small-diameter portions 176 of the valve spools 176 and 177.
a, 177a Seal members 178, 179 fitted to the outer surface
And small diameter holes 174a, 1 of valve sleeves 174,175.
Supply valves 106Aa and 106Ba are formed between the inner surface 75a and the inner surface 75a. These supply valves 106Aa, 106B
a shows that the seal members 178 and 179 of the valve spools 176 and 177
When the valve spools 176, 177 move toward the other valve spool in the valve sleeves 174, 175, the seal members 178, 179 are closed by the valve sleeve 174. , 175 move upward to tapered surfaces 174c, 175c formed at the ends of the small diameter holes 174a, 175a.

The inner surfaces of the large diameter holes 174b, 175b of the valve sleeves 174, 175 and the large diameter holes 174b, 175b,
There is a slight gap between the large-diameter portions 176b and 177b of the valve spools 176 and 177 located inside the large-diameter portion 176b.
b, 177b Seal members 180, 181 fitted to the outer surfaces
And large diameter holes 174b, 1 of valve sleeves 174,175
The discharge valves 106Ab and 106Bb are formed between the discharge valves 106Ab and 106Bb. These discharge valves 106Ab, 106Bb
In the non-operating state, the seal members 180 and 181 of the valve spools 176 and 177
The valve spools 176 and 177 are open on the tapered surfaces 174d and 175d of the valve sleeves 175 and 175d.
When it moves to the 77 side, the seal members 180 and 181
Are the large diameter portions 174b of the valve sleeves 174, 175,
Move into 175b and close.

A small-diameter cylindrical portion 32d is formed at the tip of the input transmission member 32 inside the valve hole 4a, and an input rod 15 serving as a control valve operating member is formed in the cylindrical portion 32d.
0 is inserted and fixed by a diametrical spring pin 151. The input rod 150 is slidably inserted in an inner hole penetrating through the shaft cores of the valve spools 176 and 177 while maintaining airtightness. The distal end of the input rod 150 protrudes from a valve spool 176 disposed on the back side of the valve hole 4a, and an annular engaging member 158 that engages with the valve spool 176 is provided on the outer periphery of the protruding portion. 159.

The space between the two valve spools 176 and 177 is an air supply chamber 160 connected to a pressure source (air source) (not shown).
5 (the supply valves 106Aa and 106Ba and the discharge valve 10
6Ab, 106Bb) is a working pressure chamber 16 connected to each pressure chamber (not shown) of the power cylinder.
4,165. Also, the valve sleeve 17
4,175 Both stopper members 1 arranged at both ends
The spaces outside 70 and 172 are exhaust chambers 184 and 172, respectively.
185, these exhaust chambers 184, 185
Is an internal passage (connection passage) 150a of the input rod 150.
And a radial hole 32e formed in the cylindrical portion 32d of the input transmission member 32 and a radial hole 150e formed in the input rod 150. A plurality of through holes 170a, 172a are formed in the stopper members 170, 172 at equal intervals in the circumferential direction, and these through holes 170a, 172a are formed in the exhaust chambers 18 respectively.
4,185 constitute an exhaust passage.

Further, the exhaust chamber 18 on the input transmission member 32 side
5 is a radial hole 4c of the shift shaft 4, a gap 18 between the outer peripheral surface of the shift shaft 4 and the inner surface of the upper case 2.
6, a chamber (lever chamber) in the cover housing 20 that covers the shift lever 12 and the input transmission lever 18.
68, and is open to the atmosphere from an exhaust port 20b formed in the cover housing 20.

The shift shaft 4 has an air supply chamber 1
60 and both working pressure chambers 164, 165 are provided with radial through holes 4e, 4f, 4g, respectively. Further, on the outer peripheral surface of the shift shaft 4 where these radial holes 4e, 4f, 4g are opened. Each annular groove 4h, 4
i, 4j are formed. Also, of the upper case 2,
Radial through holes 2b, 2c, 2d are provided in portions facing the radial holes 4e, 4f, 4g, respectively. A radial hole 2c at the center of the drawing communicating with the air supply chamber 160 is connected to a pressure source (air source) (not shown) via an air pipe 62, and radial holes on both sides communicating with both working pressure chambers 164 and 165. 2b and 2d are connected to respective pressure chambers of a power cylinder (not shown).

Since the air passage between the upper case 2 and the shift shaft 4 is configured as described above, even if the shift shaft 4 rotates with respect to the upper case 2 during the shift operation, the air supply chamber is formed. 160 and each working pressure chamber 16
4, 165 always communicate with the pressure source and the respective pressure chambers of the power cylinder. The annular grooves 4h, 4i, 4j may be provided on the inner peripheral surface of the upper case 2 instead of the shift shaft 4 side.

Here, a method of assembling the control valve 106 will be described. First, one end of the input rod 150 is inserted into the cylindrical portion 32d at the tip of the input transmission member 32, and is fixed by the spring pin 151. In this state, the locking member 140, the second stopper member 172, the valve spool 177 and the valve sleeve 175 on the right side in the figure, the valve sleeve 174 and the valve spool 176 on the left side in the figure, in this order from the other end of the input rod 150. The first stopper member 170 and the like are assembled, and then, a ring (engaging member) 158 is fitted to the tip of the input rod 150 so that the C ring 15
Fix by 9. This subassembly is inserted into the valve hole 4a of the shift shaft 4, and the pin 142 is pressed into the radial hole of the locking member 140 from both sides of the radial hole of the shift shaft 4 to form the control valve 106. Each member is fixed to the shift shaft 4. Thereafter, both ends of the pin 34 are pressed into the radial holes of the shift shaft 4 to be fixed, and the pins 34 are inserted through the elongated holes 32 a in the radial direction of the input transmission member 32 so that the shift shaft 4 and the input transmission member 32.

The operation of the transmission operating booster according to the above configuration will be described. When the control valve 106 is not operating,
Air supply chamber 160 between both valve spools 176 and 177
The valve spools 176 and 177 are pushed outward by these pressures and come into contact with the stopper members 170 and 172, respectively. In this state, as shown in FIG. 8, the sealing members 178 and 179 of the small diameter portions 176a and 177a of the valve spools 176 and 177
The supply valves 106Aa and 106Ba are closed on the inner surfaces of the small diameter holes 174a and 175a. On the other hand, the sealing members 180 and 181 of the large diameter portions 176b and 177b of the valve spools 176 and 177
75, which face the tapered surfaces 174d, 175d outside the inner surfaces of the large-diameter holes 174b, 175b.
Ab and 106Bb are open.

Accordingly, each pressure chamber of the power cylinder is cut off from the pressure source, and each working pressure chamber 16
4, 165, the discharge valves 106Ab, 106Bb, and the exhaust chambers 184, 185 via the through holes 170a, 172a of the stopper members 170, 172. Further, the exhaust chamber 184 on the left side of the figure is provided with a connection passage 150a inside the input rod 150 and a radial hole 1 of the input rod 150.
After communicating with the exhaust chamber 185 on the right side of the figure through the radial hole 32e of the input transmission member 32 and the radial direction hole 4c of the shift shaft 4, the lever chamber 68 and the exhaust port 20b of the lever housing 20 are connected. It is open to the atmosphere.

In operation, the input transmission member 3 is rotated by the rotation of the input transmission lever 18 in the same manner as in the first embodiment.
2 strokes, one valve spool 176,
177 moves toward the other valve spool 176,177. For example, when the input transmission member 32 strokes rightward in the drawing, an engaging member 158 fixed to the tip of the input rod 150 presses the valve spool 176 on the left side in the drawing to move the valve spool 176 rightward. Move. When the input transmission member 32 strokes leftward in the drawing, the distal end surface of the input transmission member 32 pushes the valve spool 177 on the right side in the drawing to move it leftward.

One of the valve spools 176 and 177 moves, and the discharge valves 106 of the valve mechanisms 106A and 106B are moved.
Ab, 106Bb are closed and the supply valves 106Aa,
When 106Ba is opened, the pressure air introduced from the pressure source into the supply chamber 160 is supplied from one of the operating pressure chambers 164 and 165 to one of the pressure chambers of the power cylinder, and the power cylinder operates to shift the transmission. The operation is performed. At this time, the valve spools 176 and 176 in which the pressures of the one working pressure chambers 164 and 165 and the pressure of the supply chamber 160 have been moved.
177, and the acting force is transmitted as a reaction force to the shift command operating means (change lever) via the input transmitting member 32.

When the gearshift operation is completed and the operating force of the gearshift command operating means becomes zero, the valve spools 176 and 177 are returned to the non-operating position by the aforementioned reaction force, and the supply valves 106Aa and 106Ba are closed again. Discharge valve 106Ab, 1
06Bb returns to the open state. As a result, the pressure in the pressure chamber of the power cylinder is discharged from the discharge valves 106Ab and 106Bb to the atmosphere via the exhaust passage, and the transmission operating booster returns to the non-operating state. In this embodiment, the same effects as in the first embodiment can be obtained.

[0063]

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 in the shift shaft of the transmission, the mounting space can be significantly reduced, and the housing can be omitted, so that the size, weight and cost can be reduced. Further, the control valve has a pair of opposed valve mechanisms provided coaxially in the shift shaft, and control valve operating means for operating the control valve is provided in the shift shaft in the axial direction. An input transmission member movably provided,
By having a structure having a control valve operating member having one end portion connected to the input transmission member through the pair of valve mechanisms, the structure of the control valve is simplified, and the control valve is reliably and smoothly made. Can be activated.

According to the third aspect of the present invention, the control valve is disposed in a valve hole formed in the shift shaft, and the valve seat members of the two valve mechanisms are different from each other. The control valve is fixed to the shift shaft by locking the locking member inserted into the valve hole from the outside of the control shaft, so that the control valve can be securely fixed to the shift shaft with a simple structure.

Further, according to the invention described in claim 4,
A radial hole penetrating the wall surface of the shift shaft, and a radial hole formed in the upper case so as to match the position of the radial hole in the axial direction constitute a part of the fluid passage of the control valve. Further, an annular groove is formed in at least one of an outer peripheral surface where the radial hole of the shift shaft is opened and an inner peripheral surface where the radial hole of the upper case is opened. Even when the shaft rotates, the fluid passage can be secured, and the structure can be simplified.

According to the fifth aspect of the present invention, in addition to the input transmitting member and the control valve operating member, the control valve operating means is configured such that an intermediate portion is rotated by a shift lever fixed to the shift shaft. It is movably supported, one end is engaged with the input transmission member, the other end has an input transmission lever connected to the shift command operation means, and the upper case further includes the shift lever and the shift lever. By providing the cover that covers the input transmission lever, it is possible to prevent dust and muddy water from entering the lever portion.

According to the invention described in claim 6, a discharge chamber is provided on the outside of the two valve mechanisms provided coaxially opposite each other in the axial direction. The shift shaft is connected by a connection passage formed in the control valve operating member, and further, the shift shaft is provided with a communication passage that communicates one of the discharge chambers and a lever chamber partitioned by the cover and the upper case, and Since the cover has an exhaust port communicating the lever chamber with the atmosphere, the configuration of the exhaust passage of the control valve can be simplified.

According to the seventh aspect of the present invention, the cover has an opening for connecting the input transmission lever and the shift command operation force transmitting means, and the boot is attached to the opening. A connecting member for connecting the input transmission lever and the shift command operating force transmitting means is attached to the distal end, thereby simplifying a connection structure between the input transmitting lever and the shift command operating force transmitting means. Can be.

[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 of a transmission operating booster according to a second embodiment.

FIG. 8 is an enlarged view of a main part (control valve) of FIG. 7;

[Explanation of symbols]

 2 Upper case 2b, 2c, 2d Upper case radial hole 4 Shift shaft 4a Valve hole 4c Shift shaft communication passage 4e, 4f, 4g Shift shaft radial hole 4h, 4i, 4j Shift shaft annular groove 6,106 Control valve 6A, 6B, 106A, 106B Valve mechanism 8 Striker 10 Power cylinder 12 Shift lever 18 Input transmission lever 18a Inclined portion 20 Cover 20a Cover opening 20b Exhaust port of cover 26 Boot 28 Connecting member (joint member) 32 Input transmission Member 32b Inclined groove 36, 37 Valve seat member 40 Locking member 44, 45 Valve seat 46, 47 Poppet valve 50, 150 Control valve operating member (input rod) 50a, 150a Connection passage (internal passage) 52, 53 Valve lifter 60, 160 Air chamber 64, 65, 164 , 165 Working pressure chamber 68 Lever chamber 70a, 70b Pressure chamber 72 Piston rod 74 Engaging member 74a Engaging hole 76 Piston 84, 85, 184, 185 Discharge chamber 174, 175 Valve sleeve 176, 177 Valve spool

Claims (7)

[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 that is provided integrally with the upper case and rotates a striker of the transmission; and a power cylinder that is provided in a shift shaft of the transmission and that is operated by a shift command operating force from the shift command operating means. A control valve for controlling the supply and discharge of fluid pressure to and from a power cylinder; and a control valve operating means connected to the shift command operating force transmitting means for operating the control valve. And a pair of opposed valve mechanisms provided coaxially within, and the control valve actuating means includes an input transmission member provided in the shift shaft so as to be movable in the axial direction; Transmission operating booster, characterized in that one end through the mechanism and a control valve actuating member coupled to the input transmission member. 2. The valve mechanism of the control valve is a one-valve two-seat type or a spool type.
3. The transmission operating booster according to claim 1. 3. The control valve is disposed in a valve hole formed in the shift shaft, and valve seat members of both valve mechanisms are inserted into the valve hole from outside the valve seat members. The booster for operating a transmission according to claim 2, wherein the stop member is fixed by locking the shift member to a shift shaft. 4. A fluid passage of the control valve, wherein a radial hole penetrating a wall surface of the shift shaft and a radial hole formed in the upper case so as to coincide with the radial hole in the axial direction. And an annular groove is formed on at least one of an outer peripheral surface of the shift shaft where the radial hole is opened and an inner peripheral surface of the upper case where the radial hole is opened. 3. The method according to claim 2, wherein
4. A transmission operating booster according to claim 3. 5. The control valve actuating means has an intermediate portion rotatably supported by a shift lever fixed to the shift shaft, one end of which is engaged with the input transmission member, and the other end of which is the shift command operation. The transmission according to any one of claims 1 to 4, further comprising an input transmission lever connected to the means, and a cover for covering the shift lever and the input transmission lever in the upper case. Booster for machine operation. 6. A discharge chamber is provided outside each of the two valve mechanisms provided coaxially and opposed in the axial direction,
These two discharge chambers are connected by a connection passage formed in the control valve actuating member, and further, the shift shaft communicates with one of the discharge chambers and a lever chamber defined by the cover and the upper case. The transmission operating booster according to claim 5, wherein a passage is provided, and an exhaust port that communicates the lever chamber with the atmosphere is formed in the cover. 7. The cover has an opening for connection between the input transmission lever and a transmission command operation force transmitting means, and the input transmission lever and the transmission are connected to a tip of a boot attached to the opening. 6. The booster for operating a transmission according to claim 5, wherein a connecting member for connecting to the command operating force transmitting means is attached.