JPH1078124A - Transmission operation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate reduction of size and cost by reducing the number of required items, simplifying a structure and reducing weight. SOLUTION: A cylinder housing 40 has parallely formed cylinder holes 31a, 31b, 32a, 32b. Pistons 51, 52 slidably fitted to the cylinder holes have pressure chambers 21a, 21b, 22a, 22b on their both ends. An actuator 23 is provided with a common reception lever 35 receives operation force from the pistons and transmits it to a transmission. The reception lever 35 has reception parts 35a, 35b for directly receiving the operation force at intermediate positions in axial directions of the pistons 51, 52. Lengths from the rotational center of the reception lever 35 to the pistons 51, 52 are differentiated from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission operating device, and is particularly suitable for improving a select operating actuator of a transmission operating device, but is also applicable to an improvement of a shift operating actuator.

[0002]

2. Description of the Related Art In a bus or a truck having a large transmission, an actuator is incorporated in a transmission operation device so that a smooth transmission operation can be performed with a small force.

FIG. 19 is a longitudinal sectional view showing a select operation actuator of a conventional transmission operating device. In the actuator 1, an intermediate cylinder hole 3a and both end cylinder holes 3b having a larger inner diameter than the intermediate cylinder hole 3a are formed in a cylinder housing 2. In the middle cylinder hole 3a,
The main piston 4 is slidably housed, and the main piston 4 is attached to the piston rod 5. A pair of free pistons 6, 7 arranged outside the both ends of the piston rod 5 are housed in the cylinder holes 3b at both ends one by one.

A main piston 4 is provided in a cylinder hole 3a.
And two partition walls 2a and 2b, two pressure chambers 8 in the cylinder 3.
a, 8b are defined. The pressure chambers 9a and 9b are also defined by a pair of free pistons 6 and 7 having a larger pressure receiving area than the main piston 4.
Further, a pair of stoppers 10a and 10b are fixed in the cylinder housing 2 corresponding to the pair of free pistons 6 and 7, respectively.

In the actuator 1, a joint member 12 is fixed to the piston rod 5, and a receiving lever 13 rotatable about a lever shaft 14 is operated from the piston rod 5 via the joint member 12. Upon receiving the force, the received operation force is transmitted to an operation lever (not shown).

The actuator 1 has ports 15 at both ends,
16 to a pressure chamber 9 at both ends from a common tank (not shown).
The compressed air is supplied to the free pistons 6 and 7 so that the free pistons 6 and 7 respectively correspond to the corresponding stoppers 10a and 10b.
By supplying compressed air to the right pressure chamber 8b through the right intermediate port 18, the piston rod 5 comes into contact with the left free piston 6 as shown in FIG. Thus, receiving the lever 13 so that the posture corresponding to the position N ₃ shift pattern C receives the operating force. Further, from a state where all the pressure chambers 8a, 8b, 9a, 9b are opened to the atmosphere,
The free piston 6 and 7 in the same position as above, when supplying compressed air to the left side of the pressure chamber 8a through the left side of the intermediate port 17, receiving the lever 13 so is the posture corresponding to the position N ₂ shift pattern C Receive operating force. At this time, the piston rod 5 comes into contact with the right free piston 7 and is positioned.

Further, all the pressure chambers 8a, 8b, 9a,
When the compressed air is supplied only to the left pressure chamber 8a from a state in which the free piston 9b is opened to the atmosphere and the two free pistons 6 and 7 are in contact with the respective inner end walls, the main piston 4 slides rightward and receives lever 13 is in a corresponding position to the position N ₁ of the shift pattern C receives the operation force. Further, when all the pressure chambers are opened to the atmosphere and the compressed air is supplied only to the right pressure chamber 8b from a state in which the two free pistons 6 and 7 are in contact with the respective inner end walls, the main piston 4 moves to the left. sliding and receive lever 13 is positioned N ₄ shift pattern C
The posture corresponding to.

[0008]

However, the conventional actuator 1 uses the piston rod 5, the joint member 12, and the like, requires a large number of parts, has a complicated structure, is heavy, and is difficult to miniaturize. There was a disadvantage that the cost was high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and has as its object to reduce the number of necessary parts, simplify the structure, reduce the weight, and arrange the components in parallel. It is an object of the present invention to provide a transmission operating device that can be easily miniaturized and inexpensive by using a short piston, can easily center the short piston, and is free from the risk of tilting the piston and damaging the cylinder hole.

[0010]

In order to achieve the above object, the gist of the present invention is to provide a cylinder housing having a plurality of cylinder holes formed in parallel, and a cylinder housing having a plurality of cylinder holes. Provided is an actuator including a plurality of pistons slidably fitted and defining pressure chambers at both ends, and a common receiving lever that receives an operation force from the plurality of pistons and transmits the operation force to a transmission. A transmission operating device, wherein the receiving lever has a receiving portion that directly receives an operating force at an intermediate position in the axial direction of the plurality of pistons, or a first cylinder hole and a second cylinder hole formed in parallel. A cylinder housing, a first piston slidably fitted in the first cylinder hole and defining a pressure chamber on at least one end side, and slidable in the second cylinder hole. An actuator having a second piston fitted and defining a pressure chamber on at least one end side, and a common receiving lever for directly receiving an operating force from both pistons and transmitting the operating force to the transmission; The transmission operating device is characterized in that a distance from the rotation center of the receiving lever to the first piston is different from a distance from the rotation center to the second piston.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission operating device according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing a main part of a transmission operating device according to a first embodiment of the present invention, FIG. 2 is a plan sectional view showing the select operation actuator of FIG. 1, and FIG. 4 is a side sectional view showing the select operation actuator, and FIG. 4 is a transverse sectional view of FIG.

As shown in FIG. 1, the transmission operating device includes an improved select operation actuator 23 and a shift operation actuator 24. The shift operation actuator 24 has only one free piston 6. The same one as shown in FIG. 19 is adopted. The select operation actuator 23 and the shift operation actuator 24 are operated by compressed air supplied from a common air tank 25.

The compressed air from the common air tank 25 is
In the case of the select operation actuator 23, the common path 2
6 and respective communication passages 27a, 27b, 28a, 28
b, the pressure is supplied to each of the pressure chambers 21a, 21b, 22a, 22b via the respective solenoid-operated switching valves MVA, MVB, MVC. In the shift operation actuator 24, the common path 19 and the respective communication paths 19a, 19b, 19
The pressure is supplied to each of the pressure chambers 8a, 8b, 9a via the respective solenoid-operated switching valves MVa, MVb, MVc.
Each of the electromagnetic switching valves opens the corresponding pressure chamber to the atmosphere in a non-excited state (OFF), and connects the corresponding pressure chamber to the air tank 25 in an excited state (ON). The control of each electromagnetic switching valve is performed by the controller 34. The shift operation actuator 24 is almost the same as that shown in FIG. 19 except that the free piston 6 is provided only at one end side, and therefore the same portions are denoted by the same reference numerals and the description of those portions is omitted.

As shown in FIG. 1, a select operation actuator 23 and a shift operation actuator 24 are provided.
Are arranged so as to correspond to the shift pattern C. Therefore, the select operation actuator 23 can be operated only when the main piston 4 of the shift operation actuator 24 is at the intermediate position of the first cylinder hole 3a. The receiving lever 35 receiving the operating force from the select operation actuator 23 is moved to the position N
_The shift operation actuator 24 can operate only when it is located at a position corresponding to any _one of N ₁ , N ₂ , N ₃ , and N ₄ .

The transmission operating device includes a receiving lever 3
5, the relay lever 36 attached to the other end of the lever shaft 14 simultaneously rotates as shown in FIG.
At the end of the relay lever 36, the operation lever 37 is moved along the spline teeth of the shaft 38 to perform a select operation.

As shown in FIGS. 2 to 4, the select operation actuator 23 includes first cylinder holes 31a and 31a.
b and the cylinder housing 40 in which the second cylinder holes 32a and 32b are formed in parallel, and the first cylinder hole 3
1a and 31b are slidably fitted to each other and pressure chambers 21 are provided at both ends.
a, a pair of first pistons 51, 51 that define
And a pair of second cylinders slidably fitted in the second cylinder holes 32a, 32b to define pressure chambers 22a, 22b at both ends.
, And a receiving lever 35 that receives an operating force from the pistons 51 and 52 and transmits the operating force to the operating lever 37. The distance to the second piston 52 is larger than the distance to the first piston 51.

The cylinder housing 40 has a third block intermediate the first block 41 and the second block 42 at both ends.
The first block 41 and the second block 42 are fixed to the outer surfaces of both partition walls 44a and 44b of the third block 43 and are combined with each other. Blind holes 46a and 46b are respectively formed in the first block 41 and the second block 42 on both ends of the extension of the blind hole 31b.
Communication passages 27a and 27b for communicating the pressure chambers 6a and 46b with the corresponding pressure chambers 21a and 21b are opened in the first block 41 and the second block 42. Then, the compressed air in the air tank 25 is supplied to the respective pressure chambers 21a and 21b via the respective solenoid-operated switching valves MVA and MVB inserted and attached to the blind holes 46a and 46b.

In the cylinder housing 40, a similar blind hole 47 is formed in the first block 41 at one end of the second cylinder hole 32a.
A communication passage 28a for communicating the pressure chamber 22a of the second cylinder hole 32a with the first block 41 is formed in the first block 41,
The communication path 28b for communicating the blind hole 47 with the pressure chamber 22b on the other end is formed by the first block 41 and the second block 42.
And through a third block 43. Common electromagnetic switching valve MV inserted and installed in blind hole 47
When C is turned on, the compressed air in the air tank 25 is simultaneously supplied to the pressure chambers 22a and 22b at both ends through the respective communication passages 28a and 28b.

Furthermore, the cylinder housing 40, the inner surface of the third block 43 at a position facing the front end of the receiving lever 35, the photointerrupter PH ₁ ~PH ₄ are disposed at four positions by an interval. Photointerrupter PH ₁ ~PH _4, as shown in FIG. 5, have a groove 56, the tip of the light shielding plate 58 which is fixed by screwing bolts 57 to the distal end of the receiving lever 35 is shielded enters the groove 56 This constitutes a position sensor for detecting the position of the receiving lever 35.

The first cylinder holes 31a, 31b and the second
Are formed symmetrically and substantially parallel to the first block 41 and the second block 42, respectively. Each of the first pistons 51, 51 and the second pistons 52, 52 is made of a synthetic resin material so as to form a substantially symmetrical pair.
1a, 31b, 32a, 32b, which are slidably fitted, and the corresponding partitions 44a, 4 of the third block 43.
4b, the inner end protrudes between the partition walls 44a, 44b, and the inner end protruding between the partition walls is provided with a pressing surface 51c for pressing the receiving lever 35, and the respective pressure chambers 21a, 21b An annular seal member 53 is provided on the outer periphery of the shifted position.
Is fitted.

The second piston 52 includes a piston body 52
a and an inward projection 52b penetrating the corresponding one of the partition walls 44a and 44b.
The stopper 2a selectively stops at a position where it contacts the corresponding partition walls 44a, 44b or the end surfaces of the second cylinder holes 32a, 32b, and also serves as a stopper for positioning the receiving lever 35. The second piston 52 includes a projection 52b
The inner end of the first piston 51 has a pressing surface 52c, has the same pressure receiving area as the first piston 51, and has a shorter overall length than the first piston 51.

The receiving lever 35 has a base fixed to the lever shaft 14 and is rotatable about the lever shaft 14. The receiving lever 35 is engaged with the first piston 51 and has both pressing surfaces 51c, 51c.
The first receiving portion 35a located between the pressing surfaces 51c and the second piston 52 and the second receiving portion 35a
Receiving the operating force directly from the first piston 51 and the second piston 52 that come into contact with both receiving portions. First receiving portion 35a and second receiving portion 35b
Has a disc shape, and each piston 5
It receives an operating force from 1,52.

FIGS. 6 to 9 are sectional views for explaining the operation of the transmission operating device according to the embodiment of the present invention. Each of the electromagnetic switching valves MVA, MVB, and MVC is demagnetized, and each of the pressure chambers 2 is demagnetized.
1a, 21b, 22a, in a state in which 22b is opened to the atmosphere, depressing the clutch pedal, placing the shift lever 39 to position N ₁ of the shift pattern C, and FIG. 6, the common electromagnetic switching valve MVC is the demagnetized As it is, the pressure chambers 22a, 22b at both ends of the second pistons 52, 52 are open to the atmosphere, and the second piston is connected to the second pressure chambers 22a, 22a.
It stops at the inner end surface of 22b. The left electromagnetic switching valve MVA is excited, the compressed air is supplied from the air tank 25 to the first pressure chamber 21a on the left, and the first piston 51 on the left presses the first receiving portion 35a rightward. Then, the first receiving portion 35a is connected to the first piston 51 on the right side.
And the receiving lever 35 stops at a position where the second receiving portion 35b contacts the pressing surface 52c of the second piston 52 on the right side while the pressing lever 51 hits the pressing surface 51c. This stopped position is a position S ₁ corresponding to the position N ₁ of the shift pattern C.
This position S ₁ is a photo interrupter PH ₁ of the position sensor.
At the position S ₁ , the position F ₁ or the position R
Shift operation to ₁ becomes possible. Photo interrupter P
Detection signals detected by the H ₁ enters the controller 34, the electromagnetic switching valve MVA is demagnetized, the first pressure chamber 21a is opened to the atmosphere.

[0024] Depress the clutch pedal, when moving the shift lever 39 to the shift pattern position F ₂ through the position N ₂ from the position N ₁ of C is 7, the common electromagnetic switching valve MVC is excited state The compressed air is simultaneously supplied from the air tank 25 to the pressure chambers 22a and 22b at both ends of the second piston 52, and after a predetermined short time, the left electromagnetic switching valve MVA is turned on, and the left second pressure chamber is turned on. Compressed air is supplied to 22a. Thereby, by the action of the compressed air, first, the left and right second pistons 52,
52 slide in the direction approaching each other, and the second piston 52 on the right side presses the second receiving portion 35b to push the receiving lever 3
5 is rotated clockwise, and stops when it hits the partition wall 44b. During this time, the torque due to the leftward pressing force of the second piston 52 is greater than the torque due to the pressing force of the left first piston 51 based on the compressed air in the first pressure chamber 21a. Rotates clockwise. The receiving lever 35 rotated in this manner.
Position S ₂ which is stopped corresponds to the position N ₂ shift pattern C.

The position S ₂ is detected by the photo-interrupter PH _{2 of the} position sensor, and the detection signal enters the controller 34. The output signal from the controller 34 causes the shift operation actuator 24 to shift the shift pattern C to the position F ₂ . An operation is performed. Thereafter, each of the electromagnetic switching valves MVA, MVB, MVC is demagnetized, and each pressure chamber is opened to the atmosphere. The reason why the electromagnetic switching valve MVA on the left side is turned on after a predetermined short time has elapsed since the common electromagnetic switching valve MVC is excited is to prevent the receiving lever 35 from overrun.

Next, the clutch pedal is depressed, and the shift lever 39 is moved from the position F ₂ of the shift pattern C to the position N _2.
And when moved to position F ₃ via position N ₃ ,
The shift operation from the position F ₂ of the shift pattern C to the position N ₂ is performed by the shift operation actuator 24.
Next, in FIG. 8, the common electromagnetic switching valve MVC is in an excited state, and compressed air is simultaneously supplied from the air tank 25 to the pressure chambers 22a and 22b at both ends of the second piston 52. Is turned on, and compressed air is supplied to the first pressure chamber 21b on the right side. As a result, the left and right second pistons 52 slide in the direction approaching each other due to the action of the compressed air and stop when they come into contact with the partition walls 44a and 44b.
The piston 51 presses the first receiving portion 35a to rotate the receiving lever 35 clockwise, and stops when the second receiving portion 35b hits the left second piston 52.

In this case, the torque due to the rightward pressing force of the second piston 52 is greater than the torque due to the pressing force of the right first piston 51 based on the compressed air in the first pressure chamber 21b. The receiving lever 35 stops when the second receiving portion 35a hits the second piston 52 on the left side. Thus the position S ₃ which receives the lever 35 is stopped of being rotated by corresponding to the position N ₃ shift pattern C. The position S ₃ is the photo interrupter PH _{3 of the} position sensor
And the detection signal enters the controller 34, and the output signal from the controller 34 detects the position F of the shift pattern C by the shift operation actuator 24.
A shift operation to ₃ is performed. After that, each electromagnetic switching valve M
VA, MVB, and MVC are demagnetized, and each pressure chamber is opened to the atmosphere.

When the clutch pedal is depressed, the shift lever 39 is moved from the position F ₃ of the shift pattern C to the position N _3.
And is moved in the F ₄ through the position N _4, firstly, the shift operation from the position F ₃ shift pattern C by the shift operating actuator 24 to the position N ₃ is made. Next, in FIG. 9, while the common electromagnetic switching valve MVC remains in the demagnetized state, the right electromagnetic switching valve MVB is turned on, and compressed air is supplied to the first pressure chamber 21b on the right. Thereby, the first piston 51 on the right side is moved to the first receiving portion 35a.
To rotate the receiving lever 35 clockwise,
Stops when the receiving portion 35a hits the first piston 51 on the left and the second receiving portion 35b hits the second piston 52 on the left. The receiving lever 35 rotated in this manner.
The stop position S ₄ corresponds to the position N ₄ of the shift pattern C. The position S ₄ is the photo interrupter P of the position sensor
H ₄ is detected by the controller 3
4, the shift operation of the shift operation actuator 24 to the position F ₄ of the shift pattern C is performed by the output signal from the controller 34. Each electromagnetic switching valve MVA,
MVB and MVC are demagnetized, and each pressure chamber is opened to the atmosphere.

According to the transmission operating device according to the first embodiment, the first piston 51 and the second piston 5
2 are paired, and pressure chambers 21a,
21b, 22a and 22b are defined, it is possible to cope with a select operation between four positions, and the first cylinder holes 31a and 31b and the second cylinder holes 32a and 32b.
b has the same inner diameter, and the first piston 51 and the second
Since the pistons 52 have the same pressure receiving area, there is an advantage that the structure is simple and the manufacture is easy. Further, there is an advantage that the piston rod 5, the joint member 12, and the like become unnecessary, and the number of required parts is greatly reduced. Further, the electromagnetic switching valves MVA, MVB, MVC are directly mounted on the cylinder housing 40,
a, 27b, 27a, 27b
Since b, 28a and 28b are opened in the cylinder housing 40, piping components can be omitted. Since the first piston 51 and the second piston 52 are made of synthetic resin, weight reduction is easy.

FIG. 10 is a sectional view showing a main part of a transmission operating device in which the first embodiment of the present invention is partially improved.
The position sensor, as shown in FIG.
Further, the Hall elements H _{1 to} H ₄ are embedded in the second block 42, and the magnet 60 is attached to the first piston 51. The hall elements H _{1 to} H ₄ are provided in the first block 41.
And two predetermined blocks at positions corresponding to the first cylinder holes 31a and 31b of the second block 42, respectively. Thereby, the position of the receiving lever 35 is detected by detecting the positions of the first pistons 51,51. Note that the first piston 5
1, as shown in FIG. 11, a notch 54 is provided integrally at an intermediate position in the longitudinal direction, a receiving lever 35 is passed through the notch 54, and the inner end face of the notch 54 is set to a pressing surface 54 c. Good.

FIG. 12 is a plan sectional view showing a transmission operating device according to a second embodiment of the present invention, FIG. 13 is a partially cutaway side view thereof, and FIG. 14 is a plane including the axis of the lever shaft of FIG. FIG. The transmission operating device 23A divides the second piston 52 having a short length into an inner piston 62 on the lever 35 side and an outer piston 63 defining the respective pressure chambers 22a and 22b. Has a pressing surface 63a for contacting and pressing the outer end surface 62d of the inner piston 62, and forms an annular gap 64 between the outer peripheral surfaces of the inner pistons 62, 62 and the inner peripheral surfaces of the cylinder holes 32a, 32b. And the pressing surface 6 of each outer piston 63
3a is a convex curved surface.

Each of the outer pistons 63 defines a pressure chamber 22a, 22b on the outer side thereof. When compressed air is supplied to the pressure chambers 22a, 22b, the pressure chambers 22a, 22b pass through the corresponding outer piston 63. The second pistons 52, 52 receive a pressing force in the direction of pressing the receiving lever 35 from the pressing surface 63a.

The transmission operating device 23A is provided with bearing portions 65, 6 of the third block 43 of the cylinder housing 40.
6, six anti-tilt bushes 67 and 68 for guiding the first piston 51 and the inner piston 62 straight, and two places along the outer circumference of the wear ring 70 and the outer piston 63 along the outer circumference of the first piston 51. , And four reed switches R _{1 to} R ₄ are provided as sensing means in place of the photo interrupter and the Hall element, and the second receiving portion 3 of the receiving lever 35 is provided.
Each of the reed switches R _{1 to} R ₄ is arranged so as to be inclined with respect to the movement trajectory of the corresponding portion of 5b and narrow the interval.

The reed switches R _{1 to} R ₄ are embedded in a rectangular synthetic resin plate 73. The synthetic resin plate 73 is fixed to the sensor case 76 by screwing bolts 74 at four corners into the wall of the sensor case 76 separate from the third block 43 of the cylinder housing 40. The sensor case 76 is attached to the third block 43 by screwing a plurality of bolts 77. Then, the reed switches R _{1 to} R ₄ are turned on when the permanent magnet 75 fixed near the tip of the receiving lever 35 comes to the opposite position, and senses the position of the receiving lever 35. On one side of the third block 43 of the cylinder housing 40, a cover plate 80 is detachably attached with a plurality of bolts 81. By removing the cover plate 80, an opening of the third block 43 appears. . Note that the sensor wiring is led out through a grommet 82 fitted in a substantially U-shaped notch 76a cut out from a joint of the sensor case 76 with the third block 43 of the cylinder housing 40.

Transmission operating device 2 according to a second embodiment
3A is almost the same as that of the first embodiment except for the above points. Therefore, the same reference numerals are given to the same or corresponding parts, and the duplicated description is omitted.
Therefore, the sectional views corresponding to FIGS. 6 to 9 are respectively shown in FIGS. 15 to 18 and the description is omitted.

Transmission operation according to a second embodiment of the present invention
In the working device 23A, the inner piston 62 having a short length is
There is a pressing surface 63a for contacting and pressing the outer end surface 62d.
The outer piston 63 is provided.
Outer peripheral surface of inner piston 62 pressed against and its syringe
An annular gap 64 is to be formed between the inner peripheral surface of the dowel hole.
The reason is to facilitate the centering of the second piston 52.
And the pressing surface 63a of the outer piston 63 is a convex curved surface.
The inclination of the inner piston 62 and the outer piston 63
In order to eliminate centering and to make centering easier, the first pin
Along the outer circumference of the ston 51 and the outer piston 63
Is provided with the wear rings 70 and 71.
Always guide the piston 51 and the outer piston 63 straight,
Damages the inner peripheral surfaces of the solder holes 31a, 31b, 32a, 32b.
This is in order to eliminate the risk of being thrown. Also, the receiving lever 35
Four reed switches as sensing means to detect the position of
R ₁~ R_FourAnd the moving rail of the corresponding portion of the receiving lever 35
4 reed switches R
₁~ R_FourThe power supply for the sensing means is omitted.
And tilt the four reed switches to the required
Reduce the size by using an inexpensive sensor
This is to make it easier.

The present invention is not limited to the above embodiment, and various modifications can be made without adding new matter. For example, the present invention can be applied not only to the select operation actuator 23 but also to the shift operation actuator 24. One of the paired second pistons 52, 52 may be omitted, or the pressure chamber at one end may be omitted. it can. Further, by providing a third piston in parallel in addition to the first piston 51 and the second piston 52, it is possible to cope with a select operation between five or six positions. Outer end face 6
2d may be convex and the pressing surface 63a of the outer piston 63 may be flat.

[0038]

The present invention has the following effects. Form multiple cylinder holes in parallel in the cylinder housing,
An actuator including a plurality of pistons slidably fitted in each of the plurality of cylinder holes and defining pressure chambers at both ends, and a common receiving lever receiving an operating force from the plurality of pistons is provided. As a result, a plurality of pistons are arranged in parallel, so that miniaturization and weight reduction are easy,
The receiving part of the receiving lever directly receives the operating force of the multiple pistons, so the number of necessary parts can be reduced, and since there are four or more pressure chambers, it is possible to correspond to four or more positions of the shift lever. is there. A first cylinder hole and a second cylinder hole are formed in parallel in the cylinder housing, and the first cylinder hole is slidably fitted in the first cylinder hole to define a pressure chamber on at least one end side. An actuator comprising: a piston; a second piston slidably fitted in the second cylinder hole and defining a pressure chamber on at least one end side; and a common receiving lever for directly receiving an operating force from both pistons By providing less than four pressure chambers, less than four positions of the shift lever can be accommodated. Since the distance from the rotation center of the receiving lever to each of the plurality of pistons is different from each other, a torque difference received by the receiving lever can be obtained according to the lever ratio. Can have the same diameter, thereby simplifying the structure and reducing the cost. Further, since at least one of the pistons also serves as a stopper for positioning the receiving lever, it is possible to further reduce the weight and reduce the number of required parts. By mounting a switching valve for supplying and discharging compressed air to and from each pressure chamber in the cylinder housing and providing a passage for compressed air in the cylinder housing, piping components can be omitted. A piston having at least the shortest length is divided into an inner piston on the lever side and an outer piston defining a pressure chamber, and the outer piston has a pressing surface for contacting and pressing the outer end surface of the inner piston. By forming a gap between the outer peripheral surface of the inner piston and the inner peripheral surface of the cylinder hole, centering of the piston is facilitated, and pressing of the outer end surface of the inner piston and the outer piston that abut against each other is performed. Since one of the surfaces is a convex surface and the other is a flat surface, the inclination of the inner piston and the outer piston can be prevented. , The wear ring arranged along the outer periphery of the piston prevents the piston from tilting and may damage the inner peripheral surface of the cylinder hole. No. Also, by providing a plurality of reed switches as sensing means for detecting the position of the receiving lever and arranging the plurality of reed switches inclining with respect to the movement locus of the corresponding portion of the receiving lever, a power supply unit is not required, The arrangement size can be narrowed by inclining the reed switch, the number of attached parts is small, and it is easy to reduce the size with an inexpensive sensor.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a main part of a transmission operating device according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view showing the select operation actuator of FIG. 1;

FIG. 3 is a side sectional view showing the select operation actuator of FIG. 1;

FIG. 4 is a cross-sectional view of FIG.

FIG. 5 is a partial sectional view showing the position sensor at a position passing through the center of the receiving lever.

FIG. 6 is a cross-sectional view for explaining the operation of the transmission operating device according to the first embodiment of the present invention.

FIG. 7 is a cross-sectional view for explaining the operation of the transmission operating device according to the first embodiment of the present invention.

FIG. 8 is a cross-sectional view for explaining the operation of the transmission operating device according to the first embodiment of the present invention.

FIG. 9 is a cross-sectional view for explaining the operation of the transmission operating device according to the first embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a main part of a transmission operating device in which the first embodiment of the present invention is partially improved.

FIG. 11 is a side view showing a modification of the first embodiment of the present invention and corresponding to FIG. 3;

FIG. 12 is a plan sectional view showing a select operation actuator of a transmission operating device according to a second embodiment of the present invention.

FIG. 13 is a partially cutaway side view of FIG.

14 is a cross-sectional view taken along a plane including the axis of the lever shaft in FIG.

FIG. 15 is a cross-sectional view for explaining the operation of the transmission operating device according to the second embodiment of the present invention.

FIG. 16 is a cross-sectional view for explaining the operation of the transmission operating device according to the second embodiment of the present invention.

FIG. 17 is a sectional view for explaining the operation of the transmission operating device according to the second embodiment of the present invention.

FIG. 18 is a sectional view for explaining the operation of the transmission operating device according to the second embodiment of the present invention.

FIG. 19 is a longitudinal sectional view showing a select operation actuator of a conventional transmission operating device.

[Explanation of symbols]

MVA to MVC Electromagnetic switching valves R _{1 to} R ₄ Reed switches 21 a, 21 b, 22 a, 22 b Pressure chamber 23 Select operation actuator 24 Shift operation actuator 25 Air tank 26 Common path 27 a, 27 b, 28 a, 28 b Communication path 31 a, 31 b 1 cylinder hole 32a, 32b second cylinder hole 34 controller 35 receiving lever 35a first receiving portion 35b second receiving portion 40 cylinder housing 46a, 46b, 47 blind hole 51 first piston 52 second piston 56 Slit 58 Light shielding plate 62 Inner piston 62d Outer end surface 63 Outer piston 63a Pressing surface 64 Annular gap 65, 66 Bearing 67, 68 Tilt preventing bush 70, 71 Wearing 73 Synthetic resin plate 75 Permanent magnet

Claims (9)

[Claims] A cylinder housing having a plurality of cylinder holes formed in parallel; a plurality of pistons slidably fitted in the respective plurality of cylinder holes to define pressure chambers at both ends; An actuator having a common receiving lever that receives an operating force from a plurality of pistons is provided, and the receiving lever has a receiving portion that directly receives an operating force at an intermediate position in the axial direction of the plurality of pistons. Transmission operating device. 2. The transmission operating device according to claim 1, wherein distances from the center of rotation of said receiving lever to each of said plurality of pistons are different from each other. 3. A cylinder housing having a first cylinder hole and a second cylinder hole formed in parallel, and a pressure chamber at least at one end side slidably fitted in the first cylinder hole. A first piston, a second piston slidably fitted in the second cylinder hole and defining a pressure chamber at least on one end side, and a common receiving lever directly receiving an operating force from both pistons Wherein the distance from the rotation center of the receiving lever to the first piston is different from the distance from the rotation center to the second piston. Operating device. 4. The transmission operating device according to claim 1, wherein at least one of the pistons also functions as a stopper for positioning the receiving lever. Transmission operating device. 5. The transmission operating device according to claim 1, wherein a switching valve for supplying and discharging compressed air to and from each of the pressure chambers is attached to the cylinder housing, and a passage for the compressed air is provided in the cylinder housing. A transmission operating device characterized by being provided. 6. A cylinder housing having a plurality of cylinder holes formed in parallel, a plurality of pistons slidably fitted in each of the plurality of cylinder holes and defining pressure chambers at both ends, An actuator having a common receiving lever for receiving an operating force from a plurality of pistons, wherein at least one of the plurality of pistons has a shortest piston and an outer piston defining an inner piston on the receiving lever side and a pressure chamber; The outer piston has a pressing surface for contacting and pressing the outer end surface of the inner piston, and a gap is formed between the outer peripheral surface of the inner piston and the inner peripheral surface of the cylinder hole. A transmission operating device, wherein the receiving lever has a receiving portion that directly receives an operating force at an intermediate position in the axial direction of the plurality of pistons. 7. The transmission operating device according to claim 6, wherein one of an outer end surface of the inner piston and a pressing surface of the outer piston that are in contact with each other are convex and the other is flat. Operating device. 8. The transmission operating device according to claim 6, further comprising: an inclination preventing bush that guides the plurality of pistons straight; and a wear ring disposed along an outer circumference of the outer piston. Transmission operating device. 9. A cylinder housing having a plurality of cylinder holes formed in parallel, a plurality of pistons slidably fitted in each of the plurality of cylinder holes and defining pressure chambers at both ends, An actuator having a common receiving lever receiving operating forces from a plurality of pistons is provided, and the actuator is provided with a plurality of reed switches as sensing means for detecting the position of the receiving lever, and moving a corresponding portion of the receiving lever. A transmission operating device, wherein the plurality of reed switches are arranged to be inclined with respect to a locus.