JPH0680950U - Booster for transmission operation - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent water from entering through the exhaust hole that opens on the end face of the piston rod. A hollow piston rod 2 is slidably arranged in a cylinder 4, an operating rod 1 is inserted from one end of the piston rod 2, and the tip of the operating rod 1 is further inside the piston rod 2. A switching valve 5 is installed further back than the above, and the operating rod 1 is pushed into the piston rod 2 to operate the switching valve 5, and the piston 2a of the piston rod 2 defines the inside of the cylinder 4. Of the two pressure chambers, compressed air is supplied to the pressure chamber on the insertion side of the operation rod 1 to activate the piston 2a, and the air in the other pressure chamber is opposite to that on the insertion side of the operation rod 1 of the piston rod 2. In a transmission booster configured to discharge to the outside through an exhaust hole 28 that opens at the end face of the valve member, a valve member that opens in the exhaust hole 28 only in the air discharge direction It is characterized by wearing 31.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a booster device for operating a transmission, which boosts an operating force by a fluid pressure such as compressed air when operating a transmission such as an automobile.

[0002]

[Prior art]

 The operation of the transmission generally requires a larger force for the shift operation than the select operation. For this reason, especially in buses and trucks with large transmissions, a booster is attached to the transmissions to enable smooth shift operations with a light force.

An example of this type of booster is shown in FIG. In this booster, the 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 the outer circumference 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 movement of the piston rod 2, and the shift operation of the transmission is performed.

More specifically, the booster includes a hollow piston rod 2 slidably arranged in a cylinder 4, and an operation rod 1 inserted from one end of the piston rod 2 into the piston rod 2. A switching valve 5 is installed in the inner part of the operation rod 2 at a position deeper than the tip of the operation rod 1. The switching valve 5 urges the pair of floating valves 6 and 7 in opposite directions by a compression spring 8 to press them against the fixed valve seats 9 and 10, and the valve lifter 11 is provided outside the floating valves 6 and 7. , 12 are arranged, and these are biased by compression springs 13 and 14 in directions opposite to each other.

On the other hand, inside the piston rod 2, an air pipe 16 having a passage 15 for compressed air is arranged on the side opposite to the operation rod 1, and one end side of this air pipe 16 is operated. It is connected to the end portion of the rod 1, and the other end side is in communication with the compressed air supply port 17. A port 18 is formed in the air pipe 16 in the radial direction, and the passage 15 communicates with the hollow chamber 19 formed in the piston rod 2 through the port 18. Then, compressed air is supplied to the hollow chamber 19 via the air pipe 16. Reference numerals 20 and 21 are slits formed on the end faces of the valve lifters 11 and 12.

Now, when the operating rod 1 is moved leftward in FIG. 4, for example, by a change lever (not shown), the tip of the operating rod pushes the slit end surface of the valve lifter 12, so that the valve lifter 12 moves leftward. Moving. As a result, the floating valve 7 is pressed by the valve lifter 12 and moves leftward in FIG. 4, and a gap is created between the floating valve 7 and the fixed valve seat 10. On the other hand, since compressed air is constantly supplied into the air pipe 16 from the direction of the arrow in FIG. Flows into the pressure chamber 24 on the right side of. In this way, pressure is applied to the piston 2a of the piston rod 2, 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 exhausted from the end surface 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. Reference numeral 29 is a filter for preventing dust from entering the inside through the exhaust hole 28.

[0007]

[Problems to be solved by the device]

 By the way, this booster is installed outside the transmission. For this reason, there is a possibility that water may enter the interior from the exhaust hole 28 during car washing, resulting in malfunction.

[0008]

[Means for Solving the Problems]

 The present invention is intended to solve such a problem, and its gist is to arrange a hollow piston rod slidably in a cylinder and insert an operation rod into the inside from one end of the piston rod. In addition, a switching valve is installed inside the piston rod farther than the tip of the operating rod, and the operating rod is pushed into the piston rod to operate the switching valve. Of the two pressure chambers defined in the cylinder, compressed air is supplied to the pressure chamber on the insertion side of the operating rod to operate the piston, and the air in the other pressure chamber is used to operate the piston rod. In a transmission booster in which air is exhausted to the outside through an exhaust hole that opens on the end surface opposite to the rod insertion side, air is exhausted into the exhaust hole. In transmission steering action booster, characterized in that mounted a valve member which is opened only in direction.

[0009]

[Action]

 In the booster of the present invention, the air in the cylinder is discharged to the outside by opening the valve member, but the invasion of water from the exhaust hole is blocked by this valve member.

[0010]

【Example】

 FIG. 1 shows the booster of the present invention. In this booster, a plug 30 having a plurality of exhaust passages 28 is screwed into the end of the output rod 2. A valve member 31 that opens only in the air discharge direction is attached to each exhaust passage 28. The valve member 31 is made of a flexible material such as rubber. Specifically, as shown in FIG. 2, the distal end is narrowed to form a slit 31a and the proximal end is formed. The flange 31b is extended. The valve member 31 is fitted into the exhaust hole 28 of the plug 30 with its tip facing outward, and the flange 31b is housed in the recess 32 formed in the end surface of the plug 30, and the flange 31b is sandwiched between the plug 30 and the collar 33. Is. As shown in FIG. 3, the valve member 34 may be used in which the tip is narrowed into a cross shape and the slit 34a is formed therein, and the flange 34b is extended at the base end. The other members are configured in the same manner as the device of FIG.

Since the present embodiment is configured in this way, when the piston 2a moves to the left side in the figure, the air pressure in the left pressure chamber 25 rises and the slit 31a of the valve member 31 is pushed and expanded. The air in the pressure chamber 25 is discharged into the atmosphere through the through holes 26 and 27, the exhaust passage 11a of the valve lifter 11, the slit 20 of the valve lifter 11, the inside of the collar 33, the valve member 31, and the exhaust passage 28. It 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 will not be blown off even if water is directly sprayed onto the exhaust hole 28 during car washing.

[0012]

[Effect of device]

 According to the present invention, there is no possibility that water may enter the inside of the vehicle from the exhaust passage that opens at the end surface of the piston rod when washing the vehicle, and it is possible to completely prevent malfunctions. Further, this valve member also has an effect of playing a role of a filter 29 for preventing dust from entering.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a booster according to 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 modified example of FIG.

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

[Explanation of symbols]

 1 Operation Rod 2 Piston Rod 3 Striker 4 Cylinder 5 Switching Valve 16 Air Pipe 17 Compressed Air Supply Port 28 Exhaust Hole 30 Plug 31 Valve Member 31a Slit 31b Flange 32 Recess 33 Color

Claims (1)

[Scope of utility model registration request] 1. A hollow piston rod is slidably arranged in a cylinder, an operating rod is inserted from one end of the piston rod, and the operating rod is further inside the piston rod than the tip of the operating rod. One of the two pressure chambers defined in the cylinder by the piston of the piston rod is used to push the operating rod into the inside of the piston rod. Compressed air is supplied to the pressure chamber on the insertion side to operate the piston, and the air in the other pressure chamber is exhausted to the outside from the exhaust hole opened on the end surface of the piston rod opposite to the operation rod insertion side. In the transmission booster, a valve member for opening the transmission is installed in the exhaust hole only in the air discharge direction. apparatus.