JP2601107Y2 - Gearbox for gearbox operation - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a booster for operating a transmission, which boosts an operating force by a fluid pressure of compressed air or the like when operating a transmission of an automobile or the like.

[0002]

2. Description of the Related Art The operation of a transmission generally requires a greater force for a shift operation than a select operation. For this reason, especially in a bus or a truck having a large transmission, a booster is attached to the transmission so that a smooth shift operation can be performed with a light force.

FIG. 4 shows an example of this type of booster. In this booster, an operating rod 1 as an input shaft is connected to a change lever via a predetermined link mechanism (not shown), and a striker 3 is attached to an outer periphery of a piston rod 2 as an output shaft. The striker 3 is connected to a transmission lever (not shown). Then, the transmission lever is moved by the reciprocating motion of the piston rod 2, and the shift operation of the transmission is performed.

[0004] The booster is described in detail in the cylinder 4
A hollow piston rod 2 is slidably disposed therein, and the operation rod 1 is inserted through one end of the piston rod 2 into the piston rod 2. The switching valve 5 is installed in the apparatus. The switching valve 5 urges the pair of floating valves 6, 7 in directions opposite to each other with a compression spring 8 and presses them against the fixed valve seats 9, 10, and the valve lifters 11, 11 on the outside of the floating valves 6, 7. 12 and these are compressed springs 1
The structure is urged in directions opposite to each other at 3,14.

On the other hand, an air pipe 16 having a compressed air passage 15 is disposed inside the piston rod 2 and on the side opposite to the operation rod 1. One end of the air pipe 16 is connected to the operation rod 1. And the other end is connected to a supply port 17 for compressed air.
A port 18 is formed in the air pipe 16 in the radial direction. The port 18 communicates the passage 15 with a hollow chamber 19 formed in the piston rod 2.
Thus, compressed air is supplied to the hollow chamber 19 through the air pipe 16. In addition, 20, 21
Is a slit formed on the end face of each of the valve lifters 11 and 12.

When the operating rod 1 is moved leftward in FIG. 4 by a change lever (not shown), the tip of the operating rod pushes the slit end face of the valve lifter 12, so that the valve lifter 12 moves leftward. I do. As a result, the floating valve 7 is pressed by the valve lifter 12 to
, And a gap is generated between the floating valve 7 and the fixed valve seat 10. On the other hand, since compressed air is always supplied into the air pipe 16 from the direction of the arrow in FIG.
Compressed air blown out of the hollow chamber 19, the gap, the through hole 2
2 and 23 sequentially flow into the right pressure chamber 24 in the cylinder 4. Thus, pressure is applied to the piston 2a of the piston rod 2, and the piston rod 2 moves leftward and follows the operation rod 1. On the other hand, the air in the left pressure chamber 25 is discharged from the end face of the piston rod 2 through the through holes 26 and 27, the passage 11a of the valve lifter 11, and the exhaust hole 28. In addition,
Reference numeral 29 denotes a filter for preventing dust from entering the inside through the exhaust hole 28.

[0007]

The booster is installed outside the transmission. For this reason, there is a possibility that water may enter the inside through the exhaust hole 28 during the washing of the vehicle, resulting in malfunction.

[0008]

Means for Solving the Problems The present invention is intended to solve such problems, and the gist of the invention is as follows.
A hollow piston rod is slidably disposed in the cylinder, an operation rod is inserted through one end of the piston rod, and a switching valve is provided inside the piston rod at a position deeper than a tip of the operation rod. The operating rod is pushed into the piston rod to operate the switching valve, and among the two pressure chambers defined in the cylinder by the piston of the piston rod, the pressure chamber on the insertion side of the operating rod is inserted. to supply compressed air to actuate the piston, the other pressure chamber of the air, set on the end opposite the operating rod insertion side of the piston rod
In the transmission operating booster configured to discharge to the outside from the exhaust passage of the plug, the inside of the exhaust passage of the plug
A seating surface is formed at the
A valve member that opens only in the air discharge direction is fitted into the seat hole, and the plug is screwed into the end of the piston rod.
In transmission operating booster, characterized in that off to.

[0009]

In the booster according to the present invention, the air in the cylinder opens the valve member and is discharged to the outside, but water from the exhaust hole is prevented by the valve member.

[0010]

FIG. 1 shows a booster of the present invention. In this booster, a plug 30 through which a plurality of exhaust passages 28 are opened is screwed into the end of the output rod 2. On the back side of the exhaust passage 28, upstream of the air discharge direction
A seat hole 36 is provided forming a facing seat surface 32 .
A valve member 31 that opens only in the air discharge direction is positioned and fitted in each exhaust passage 28. This valve member 31 is formed by molding a flexible material such as rubber. Specifically, as shown in FIG. 2, the distal end is narrowed, a slit 31a is formed therein, and a flange is formed at the proximal end. 31b is extended. Then, the valve member 31 is inserted into the seat hole 36 of the plug 30 with its tip facing outward.
1b is fitted and brought into contact with the seat surface 32, the seat hole 3
6 met with flange 31b to, Aru the flange 31b of the child by positioning is sandwiched in the plug 30 and the collar 33. As shown in FIG. 3, the tip is narrowed in a cross shape, a slit 34a is formed therein, and a flange 3 is formed at the base end.
The valve member 34 formed by extending the valve member 4b may be used. The other members are configured in the same manner as the device of FIG. 4, and therefore, are denoted by the same reference numerals and description thereof is omitted.

Since the present embodiment is configured as described above,
When the piston 2a moves to the left in the figure, the air pressure in the left pressure chamber 25 rises and the slit 31 of the valve member 31
a, the air in the pressure chamber 25 passes through the through hole 2.
6 and 27, the exhaust passage 11a of the valve lifter 11,
The air is discharged into the atmosphere through the slit 20 of the valve lifter 11, the inside of the collar 33, the valve member 31, and the exhaust passage. By the way, since the flange 31b of the valve member 31 is sandwiched between the plug 30 and the collar 33, the valve member 31 is not blown off even if water is directly blown to the exhaust hole 28 at the time of car washing.

[0012]

According to the present invention, there is no danger of water entering into the interior of the vehicle when the vehicle is washed from the exhaust passage opening at the end surface of the piston rod, and the occurrence of malfunction can be completely prevented. In addition, the air exhaust
Form a seat surface facing the improvement flow side to provide a seat hole, and
Fits a valve member that opens only in the air discharge direction,
Only need to be screwed into the end of the piston rod.
It is very easy to incorporate the valve member . Further, the valve member has an effect of playing a role of a filter for preventing dust from entering.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of the booster of the present invention.

FIG. 2 is a perspective view of a valve member used in the device.

FIG. 3 is a perspective view showing a modification of FIG. 2;

FIG. 4 is a sectional view showing a conventional booster.

[Explanation of symbols]

Reference Signs List 1 operation rod 2 piston rod 3 striker 4 cylinder 5 switching valve 16 air pipe 17 compressed air supply port 28 exhaust passage 30 plug 31 valve member 31a slit 31b flange 32 seat surface 33 collar 36 seat hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A hollow piston rod is slidably arranged in a cylinder, an operation rod is inserted through one end of the piston rod, and further inside the piston rod, the operation rod is located deeper than a tip of the operation rod. The switching valve is installed on the other side, the operating rod is pushed into the piston rod to operate the switching valve, and among the two pressure chambers defined in the cylinder by the piston of the piston rod, of the operating rod, The piston is operated by supplying compressed air to the pressure chamber on the insertion side, and the air in the other pressure chamber is discharged to the outside from the exhaust passage of the plug provided at the end of the piston rod opposite to the operation rod insertion side. in transmission steering action booster apparatus that, the plug
A seating surface facing the air exhaust direction upstream in the exhaust passage of
A valve member that opens only in the air discharge direction is fitted into the seat hole, and the plug is connected to the piston lock.
A booster for operating a transmission, which is screwed into an end of the gearbox.