JP2507089Y2 - Booster for transmission operation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a booster device for operating a transmission, and more particularly to a mounting structure for an operating force output portion and a change lever joint portion, for example, a truck or a bus. The present invention relates to a device effectively used for mounting on a large vehicle such as.

[Conventional technology]

Generally, in a large vehicle such as a truck or a bus, the operation force applied to the change lever of the gear transmission becomes large, and therefore, a booster device for operating the transmission is used to assist the force operated by the driver. ing.

As a conventional booster for operating a transmission of this type, for example, there is one described in Japanese Utility Model Publication No. 62-11705. This booster for operating a transmission includes a housing including a cylinder, a hollow piston rod including a piston, the hollow piston rod being slidable and rotatable with respect to the housing,
The operating rod is slidable in the rod and restricted in rotation. The operating rod is fixedly projected on the hollow piston rod, and the operating force is transmitted to the operating rod. Sliding the rod in the piston rod, and by this movement, the fluid pressure acts on the piston of the piston rod to follow the movement of the operating rod, so that the transmission operating force boosted by the piston rod is applied. In a booster for operating a transmission, which is obtained from the operation force extracting portion, (a) the piston rod is fitted and inserted into an abdominal portion of the piston rod so as to be orthogonal to the axis of the hollow piston rod. A hollow cylindrical striker in which the operation rod disposed coaxially inside is inserted into its abdomen in an orthogonal state, and (b) the cross section of the head has a substantially elliptical outer shape. A guide piece fixed to the operation rod in the striker constitutes the operation force take-out portion, and the guide piece allows relative sliding between the hollow piston rod and the operation rod and makes a relative rotation. It is characterized in that it is designed to regulate.

[Problems to be solved by the device]

However, in such a booster for operating a transmission, a hollow cylindrical striker for transmitting an operating force to a lever of the transmission is arranged in the middle portion of the hollow piston rod so as to be orthogonal to the axis thereof. The operation rod, which is coaxially arranged in the piston rod, is inserted in the middle of the striker in an orthogonal state.Therefore, the dust-proof cover around the striker is a special shape made of cast metal. It will be necessary to manufacture it in such a way. Since the dust-proof cover is formed in a special shape, it is projected from the upper surface of the upper cover of the transmission, which adversely affects the mountability and addability of the transmission.

An object of the present invention is to provide a transmission operating booster capable of simplifying a dust-proof cover.

[Means for solving the problem]

A booster for operating a transmission according to the present invention includes a body in which a cylinder chamber is formed, a hollow piston rod that has a piston and is slidably inserted in the body,
An operation rod slidably fitted in the hollow portion of the piston rod, an operation force extracting portion connected to the piston rod so as to move integrally, and a change lever connected to the operation rod. And a fitting member attached to the piston rod, which transmits the operating force of the change lever to the operating rod and causes the operating rod to slide in the piston rod, and this movement causes fluid pressure to the piston of the piston rod. In the booster for operating a transmission, the transmission operating force is adapted to follow the movement of the operating rod, and thus the transmission operating force boosted by the piston rod is obtained from the operating force output portion. An operation force take-out portion is arranged at one end of the piston rod on the axis thereof, and a bypass is provided at an end portion of the operation rod on the operation force take-out portion side. A pass rod is extended so as to bypass the operation force extracting portion, and the joint means is arranged at a tip end portion of the bypass rod.

[Action]

According to the above-mentioned means, since the operation force take-out portion is arranged on the axial center line at the one end portion of the piston rod,
It is not necessary for the operation force take-out portion to be orthogonal to the intermediate portion of the piston rod. Therefore, the dust-proof cover for covering the operation force extracting portion only needs to cover one end portion of the piston rod, which can be simplified.

〔Example〕

FIG. 1 is a longitudinal sectional view showing a booster for operating a transmission according to an embodiment of the present invention, and FIG. 2 is a partially omitted sectional view taken along the line II-II in FIG.

In this embodiment, the transmission operating booster according to the present invention is configured as a transmission operating booster suitable for mounting on a large vehicle such as a truck, and the body 10 as a housing is I have it. A cylinder chamber 11 is formed in the body 10, and a piston rod 20 as an output shaft linked with a fork of the transmission is formed in the cylinder chamber 11.
A piston 21 formed on the outer periphery of is fitted and slidable in the axial direction. Pressure chambers 12 and 13 are formed on both sides of the piston 21 in the cylinder chamber 11, and communication holes 14 and 15 are formed in the pressure chambers 12 and 13, respectively. The piston rod 20 is formed in a substantially cylindrical shape over the entire length, and as will be described later, the piston rod 20 is configured to cooperate with a gear switching fork (not shown) of the gear transmission. Communication holes 22 and 23 are formed in the piston rod 20, and reaction force cylinder chambers 25 and 26 partitioned by a partition wall 24 are formed along the center line. In the reaction force cylinder chambers 25 and 26, a reaction force piston 30 as an operation rod that is associated with a change lever is slidably inserted in the axial direction.

The reaction force piston 30 is configured to cooperate with a change lever (not shown) via a joint member as described later. Cylinder chamber 25 for reaction force of piston rod 20 and
A first pressure chamber 33 and a second pressure chamber 34 are formed on the outer circumference of the reaction force piston 30 in 26, and springs 31 and 32 are provided in the pressure chambers 33 and 34, respectively. The end of the reaction force piston 30 opposite to the end linked to the change lever is rotatably connected to one end of the first link 40, and the end linked to the fork of the piston rod 20. The opposite end is the second link (not shown)
Is supported at one end. Both links are valve devices 50 to be described later.
Is associated with the Oshiko in.

A valve device 50 is connected to a lower portion of the body 10, and the valve device 50 includes a valve cylinder 51. A pusher 52 is arranged in the center of the valve cylinder 51 and is slidably inserted in the cylinder center direction.
The first link 40 is engaged with an annular groove 53 formed in the central portion of 52. A first valve body 54 and a second valve body 55 are arranged at both ends of the valve cylinder 51 so as to face both end faces of the pusher 52, respectively, and are slidably fitted in the axial direction. First,
The second valve bodies 54, 55 are valve seats 56, 57 formed inside the valve cylinder 51.
The springs 58 and 59 are pressed against each other, and the pusher 52 controls the seating with respect to the valve seat.

The control chamber 60 formed by the valve cylinder 51, the pusher 52, and the end surface of the first valve body 54 includes a communication hole 61, a communication hole 15 on the body 10 side, a pressure chamber 13, and a communication hole 23 for the piston rod 20. Through the pressure chamber 34. Similarly, the control chamber 62 formed by the valve cylinder 51, the pusher 52, and the end surface of the second valve body 55 includes a communication hole 63, a communication hole 14 on the body 10 side, and a pressure chamber 12.
Also, it is communicated with the pressure chamber 33 through the communication hole 22 of the piston rod 20. Further, internal exhaust holes 64, 65, 66 are opened in the pusher 52, the valve bodies 54, 55 so as to penetrate in the axial direction, and these exhaust holes 64, 65, 66 are provided in the valve device 50 and the body 10. Is communicated with the atmosphere through an external exhaust port 68 formed in a cover 67 that covers the outside of one end of the.

A spherical bearing member holder 27 is arranged at the transmission coupling side end of the piston rod 20 as the output shaft, is arranged on the axial center of the piston rod 20, and is integrally formed so as to be orthogonal to this. A spherical bearing member 28 as an operating force mounting portion is fixed to 27 so that its spherical center is located on the axial center and its spherical shaft insertion opening 28a is oriented in a substantially right-angled direction. The spherical shaft member 16 is attached to the spherical bearing member 28.
a is inserted and rotatably supported, and the spherical shaft member 1
An operating shaft 18 that is interlocked with a fork (not shown) of the transmission is connected to a male screw portion 16b formed at the other end of 6 via a lever 17.

On the other hand, a bypass rod 35 is integrally projectingly provided at the end portion of the change lever coupling side of the reaction force piston 30 serving as the input shaft.
Of the piston rod 20 so as to be guided out from the insertion hole 29 opened near one end of the piston rod 20 so as to bypass the spherical bearing member 28.
The holder 27 extends downward and extends to one side of the outside of the holder 27. A rod (only a part of which is shown) 37 interlocked with a change lever is connected to an extension end of the bypass rod 35 through a joint member 36, and the shaft center of the joint member 36 is a reaction force. It is arranged so as to be located on the extension line of the axis of the piston 30.

Then, the body 10, the spherical shaft member 16, and the bypass rod 35.
A dustproof cover 38 is attached between the spherical bearing member holder 27 and the dustproof cover 38, and the cover 38 is made of a flexible material such as rubber boot to have a simple structure. Further, the inside of the dustproof cover 38 is communicated with the inside of the cover 67 constructed at the opposite end of the body 10 through a communication hole 39 formed in the body 10.

 Next, the operation will be described.

When the reaction force piston 30 is operated to the left by the rod 37 of the change lever to change the gear ratio of the transmission while the vehicle is running, the first link pivotally attached to the other end of the reaction force piston 30. 40 is rotated counterclockwise. By the rotation of the first link 40, the pusher 52 of the valve device 50 is moved rightward. As a result, compressed air (hereinafter, referred to as air) is introduced into the communication hole 61, and the air is pressure-fed to the pressure chamber 13 via the communication hole 15 on the body 10 side. Since the piston 21 is pushed leftward by the pressure feeding of the air, the piston rod 20 is moved leftward.

At this time, the air pressure-fed to the pressure chamber 13 is also guided to the pressure chamber 34 through the communication hole 23, so that the reaction force is applied to the reaction force piston 30 by the air, depending on the degree of operation of the change lever. The driver's hand senses the reaction force of the operation.
In this case, since the joint member 36 is disposed on the axial center extension line of the reaction force piston 30, the reaction force piston 30 has a bending moment despite the bypass rod 35 bypassing the spherical bearing member 28. The operation reaction force is appropriately transmitted to the driver with almost no action.

Then, as the piston rod 20 moves to the left,
The pusher 52 is gradually returned by the cooperation of the first link 40 and the second link (not shown), and when the reaction force piston 30 stops moving, the pusher 52 is returned to the neutral position. .
As a result, the valve device 50 is closed and the piston rod
20 movements are stopped. That is, the movement of the piston rod 20 is operated following the movement of the reaction force piston 30.

On the other hand, when the piston rod 20 is moved leftward, the spherical shaft member 16 is rotated clockwise, so that the operation shaft 18 of the transmission is rotated via the lever 17 to utilize the boosting action. The changed gear shift operation is executed.

By the way, the spherical bearing portion as the operation force extracting portion needs to be dust-proof, but in the case of the conventional example in which this spherical bearing portion is provided in the intermediate portion of the piston rod 20, the dust-proof cover is a piston rod. It will be installed across both sides of the spherical bearing portion of 20. Therefore, since the structure of the dust cover is complicated, and because the piston rod needs to be supported on both sides of the dust cover to have a double-sided support structure, a rigid structure is adopted, and the housing of the booster for operating the transmission is adopted. It will be integrated with a certain body. As a result, the upper end portion of the dustproof cover projects from the upper cover of the transmission, so that the assembling property and the mounting property of the transmission are deteriorated.

However, in this embodiment, the spherical bearing member 28 and the spherical shaft member 16 as the operating force mounting portion are the piston rod 20.
Since the dustproof cover 38 is disposed at one end of the piston rod 20, the dustproof cover 38 only needs to cover around the one end of the piston rod 20. Further, since the piston rod 20 is in a state where the intermediate portion of the piston rod 20 is supported by the bearing, the dustproof cover 38 can have a flexible structure. Therefore, the structure of the dustproof cover 38 is extremely simplified, and the dustproof cover 38 can be prevented from protruding upward from the upper cover 19 of the transmission. As a result, the assemblability and mountability of the transmission can be improved.

Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, in the above embodiment, the case where the valve device 50 is arranged outside the piston rod 20 and the reaction piston 30 has been described, but the valve device 50 is incorporated inside the piston rod 20 and the reaction piston 30. You can also

[Effect of device]

As described above, according to the present invention, the structure of the dustproof cover for dustproofing the operation force extraction portion can be simplified.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a booster for operating a transmission according to an embodiment of the present invention, and FIG. 2 is a partially omitted sectional view taken along the line II-II in FIG. 10 ... Body, 11 ... Cylinder chamber, 12,13 ... Pressure chamber, 14,15
... Communication hole, 16 ... Spherical shaft member (operation force extracting part), 17 ... Lever, 18 ... Operation shaft, 19 ... Transmission upper cover, 20 ... Piston rod, 21 ... Piston, 22, 23 ... Communication hole, 24 ... Partition wall, 25, 26 ... Cylinder chamber, 27 ... Spherical bearing member holder, 28
... Spherical bearing member, 29 ... Insertion hole, 30 ... Reaction force piston, 31,
32 ... Spring, 33, 34 ... Pressure chamber, 35 ... Bypass rod, 36 ... Joint member, 37 ... Change lever rod, 38 ... Dust cover, 39 ... Communication hole, 40 ... Link, 50 ... Valve device.

Claims (1)

(57) [Scope of utility model registration request] 1. A hollow piston rod having a body in which a cylinder chamber is formed and a piston and slidably fitted in the body, and slidably fitted in the hollow portion of the piston rod. An operating rod that is inserted, an operating force extracting portion that is connected to the piston rod so as to move integrally, and a joint member that is mounted to connect a change lever to the operating rod, The operation force of the change lever is transmitted to the operation rod, the operation rod is slid in the piston rod, and the fluid pressure is applied to the piston of the piston rod by this movement to follow the movement of the operation rod. Accordingly, in the transmission operating booster configured to obtain the transmission operating force boosted by the piston rod from the operating force extracting portion, A force take-out portion is disposed on the axial center of the one end portion of the piston rod, and a bypass rod extends at an end portion of the operation rod on the operation force take-out portion side so as to bypass the operation force take-out portion. A booster device for operating a transmission, wherein the coupling means is provided at the tip of the bypass rod.