JPH0518463A - Power shifter - Google Patents

Abstract

PURPOSE:To accomplish a power shift with quick response by furnishing a lever, which has a shift cable mounting part and which couples the end of a valve to the end of a piston rod. CONSTITUTION:The rod side of a power cylinder 42 leads to an exhaust hole 47 and to the atmosphere via a rod side port 45 and a chamber fitted with a spring 32 situated in the center of a gap valve 22 between an O-ring 28 and a valve seat 26. A snap ring 10 fixes a piston 6 to piston rod 11. A lever 17 couples the outer end of the valve 22 to the end of the piston rod 11 through metal piece, etc., and a shift cable is mounted at a shift cable mounting part, and thereby the force and motion are transmitted. A holder 13 couples the end of the piston rod 11 to the lever 17. The piston 6 moves toward the rod being pushed by compressed air, and the rod 11 pushes right the lever 17 through the holder 13, and the shifting force is assisted by pulling right the shift cable. That is, the shifting force applied externally may be small.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to power shifters.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIGS. FIG. 2 is a vertical sectional view, and FIG. 3 is an operation explanatory view of a conventional example. In the figure, reference numeral 50 denotes a cylinder support, which supports the cylinder 51 on the vehicle body. A piston 52 slides in the cylinder 51. 53 is a right power cylinder chamber, 53a is a left power cylinder chamber, 54 is a shifter rod, and the piston 52 is fixed by a snap ring. 55 is a valve holder, 56
Is a right valve, 57 is the same valve seat, 56a is the left valve, 57a is the same valve seat, and 57 and 57a are formed near both ends of the valve holder 55. Reference numeral 58 denotes an air pipe into which high pressure air flows from an air tank (not shown). Reference numeral 59 is a right valve lifter, and 59a is a left valve lifter, which has a center hole and is moved by a change lever (not shown) to the left or right to open the right or left valve, and the tip end of the valve contacts the right or left valve to close and open the center hole.

Reference numeral 60 is a C-shaped retaining ring which is fitted into the groove of the air pipe 58 and pushes the right valve lifter 59 in the same direction when the air pipe 58 is moved leftward by the operation of the change lever. Reference numeral 61 is a pressure chamber to which high-pressure air is constantly introduced. 62 is a valve spring, 63 is a right valve lifter spring, 63
a is a left valve lifter spring, and a right or left valve lifter 59,
59a is biased toward the counter pressure chamber. Reference numeral 64 is a right reaction force chamber, and 64a is a left reaction force chamber, the internal pressure of which exerts a force resisting the movement of the change lever via the right valve lifter 59 or the left valve lifter 59a. 65 is a right exhaust chamber, 65a
Is a left exhaust chamber, 66 is a right exhaust gap, 66a is a left exhaust gap,
67 is an exhaust pipe, and 68 to 72 are communication holes.

Next, the operation of the conventional example will be described. (1) At the time of neutral Air from an air tank (not shown) flows into the pressure chamber 61 through the air pipe 58 and the hole 72. At that time, the left and right valves 5
6, 56a are pressed against the valve seats 57, 57a by the force of the valve spring 62, and the air does not flow out of the pressure chamber 61. The left and right valve lifters 59, 59a are the same spring 6
4, 64a are pressed in the direction opposite to the pressure chamber, and are in contact with a stopper or air pipe end crushed portion 58a (not shown).
Therefore, the left and right power cylinder chambers 53, 53a and the left and right reaction force chambers 64, 64a are all in communication with the outside air, and the piston 52 is located at the center of the cylinder 1.

(2) During operation (see FIG. 3) (b) When the change lever is operated in the direction A, the air tube 58 also moves to the left, and is fitted into the outer groove of the air pipe near the right end of the right valve lifter 59. C-shaped retaining ring 6
When pushed to 0, the valve lifter 59 moves to the left, the tip of the valve lifter 59 contacts the right valve 56, the right reaction force chamber 64 is shut off from the outside air, and when the right valve lifter 59 moves further to the left, the right valve 56 is separated from the valve seat 57, and the pressure chamber 61 and the right reaction force chamber 64 communicate with each other. In the right reaction force chamber 64, air flows into the right power cylinder chamber 53 through the holes 70 and 68 as shown by arrows, and the left The power cylinder chamber 53a communicates with the left reaction force chamber 64a through the holes 69 and 71, and exhausts to the atmosphere from the left exhaust chamber 65a through the left exhaust gap 66a.

Therefore, the piston 52 moves to the left and a force to move the shifter rod 54 to which the piston 52 is fixed to the left acts, so that the operating force of the change lever can be doubled. At this time, the force acting in the change lever operating direction is F ₁ = (piston 52 cross-sectional area) × (piston 52
Pressure difference between both sides), and at this time, since there is air pressure acting on the right reaction force chamber 64, F ₂ = (pressure difference between pressure inside right reaction force chamber 64 and atmospheric pressure) × (pressure receiving area of right valve lifter 59) The force F ₂ due to acts as an operation resistance of the change lever against the hand. (B) When the change lever is operated in the B direction, the booster operates in the B direction in almost the same manner because the device is made substantially symmetrical.

[0007]

Since the output of each conventional power shifter is constant, it is necessary to provide an adjusting mechanism on the way to change the force. Further, in the prior art, since the connection of the working compressed air source is a moving piston rod, it is necessary to use a flexible tube. In addition, the total length of the power shifter is long and inconvenient for equipment. An object of the present invention is to provide a power shifter that solves the above-mentioned problems, can adjust the output, does not require a flexible tube, and does not need to change the position of the shift cable when the power shifter is equipped, which is short, light, and has a quick response. is there.

[0008]

A valve cylinder provided in a case, a power cylinder provided in parallel with the valve cylinder and having two ports communicating with the valve cylinder, a piston provided in the power cylinder, and A piston rod, a cover that closes the end surfaces of the valve cylinder and the power cylinder, a pipe joint provided on the valve cylinder side of the cover, and two pieces each provided in the valve cylinder symmetrically with respect to the center in the longitudinal direction of the cylinder. A valve seat having a valve seat of

An O-ring is provided coaxially in the valve cylinder, extends outwardly through the rod-side cover and faces each valve seat of the valve seat, and has a hole in the center of the portion inside the valve cylinder. A valve that is opened to communicate both ends of the valve cylinder, a push spring that returns the valve to the central position, and a lever that connects the end of the valve and the end of the piston rod and that has a shift cable attachment portion. It is characterized by having.

[0010]

The valve 22 is in the central position by the spring and the spring seat in the free state in which the working compressed air is added and the shift lever is in the neutral position. When the valve is in the central position, the O-rings at both ends provided on the valve are in contact with the valve seat to block the passage of the working compressed air, and two O
The ring opens the passage away from the valve seat, and both ports of the power cylinder communicate with the atmosphere.

The piston 6 is located in the center of the power cylinder. Operate the shift lever to move the shift cable 49 to the position shown in FIG.
When the lever is moved to the right, the shift cable mounting position of the lever moves to the right, and the lever swings about the mounting point of the piston rod as an instantaneous rotation center and the valve 22 moves to the left while compressing and compressing the spring. Then, the second O-ring from the left end of the valve comes into contact with the valve seat to cut off communication with the atmosphere on the left side of the power cylinder.

Next, the O-ring at the left end of the valve 22 leaves the valve seat to open the passage of the working compressed air, and the working compressed air enters the left chamber of the left power cylinder. The right O-links 27 and 28 do not change. The piston moves to the right under the pressure of the working compressed air and moves the lever in the same direction as the movement of the shift cable via the piston rod to assist the shifting force. When the shift is finished, the shift cable stops and the shift cable attachment part of the lever also stops.

The force of the compressed spring pushes the valve back to the right. Therefore, the O-link at the left end contacts the valve seat to cut off the passage for the working compressed air. Next, the second O-ring from the left end leaves the valve seat, opens the passage, and connects the left port to the outside air, so the left power cylinder is exhausted to atmospheric pressure and the piston stops. The spring seat hits the valve cylinder and the valve returns to the center position and stops. The same applies when the cable is pulled to the left, which is the opposite of the above, and the description thereof is omitted.

[0014]

Embodiment An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of the embodiment. In the figure, 1 gives the whole case. Reference numeral 43 denotes a valve cylinder, which is a cylindrical hole provided in the case 1. Reference numeral 42 is a power cylinder, which is provided in parallel with the valve cylinder 43 and has a cylindrical hole provided with two ports 44 and 45 communicating with the valve cylinder 43, in which a liner is inserted. Reference numeral 2 is a cover that closes the end surfaces of the valve cylinder 43 and the power cylinder 42.
A piston 6 is provided in the power cylinder 42 and has a thick disk shape.

A piston rod 11 is fitted in the center of the piston 6 and penetrates the case 1 through a seal.
Reference numeral 10 is a snap ring which is fitted to the piston rod 11 outside the piston 6. A holder 13 is attached to the outer end of the piston rod 11. 1
Reference numeral 7 is an assembly lever, which is assembled into parts, and the central portion thereof is pin-connected to the holder 13. A valve 22 is provided concentrically at the center of the valve cylinder 43, penetrates the rod-side wall of the case 1 to the outside through a seal, and is coupled to the lever 17 via a metal member.

Reference numeral 26 denotes a valve seat having two valve seats, which is fitted to the rod side in the valve cylinder 43. An O-ring 27 is provided on the valve 22 on the most rod side. An O-ring 28 is provided on the valve 22 second from the rod side. An O-ring 30 is provided at the cover-side end of the valve 22. An O-ring 29 is provided on the valve 22 second from the end on the cover side. Reference numeral 32 denotes a spring, which is a pressing spring and is provided on the valve cylinder 43. A spring seat 33 is loosely fitted to the valve 22 and is fitted to the valve cylinder 43 to receive the spring 32. Reference numeral 20 denotes an E ring, which is provided on the valve 22 outside the spring seat 33. A valve seat 34 is fitted on the cover side of the valve cylinder 43, and O-rings 29, 30 engaging with the valve seat are provided on the cover side of the valve 22. A holder 36 is attached to the outer end of the valve 22 and is connected to the lever 17. A ball 37 is fitted in the holder 36, and the lever 17 is loosely fitted in the hole.

Reference numeral 44 denotes a cover side port, which is a hole penetrating the wall of the power cylinder 42 on the cover side. Reference numeral 45 denotes a rod side port, which is a hole penetrating the wall of the power cylinder 42 on the rod side. A pipe joint 46 is provided on the valve cylinder side of the cover 2. Reference numeral 47 denotes an exhaust port, which is a hole penetrating the central wall of the valve cylinder 43. Reference numeral 48 is a hole formed in the center from the cover side of the valve 22 and communicates with the tip of the valve cylinder 43 on the rod side. 49
Is a shift cable attachment portion and is provided on the lever 17.

The operation of the above embodiment will be described. Pipe joint 46
It is assumed that a compressed air pipe is connected to and a working compressed air of about 7.5 kgf / cm ² is added. When the shift lever (not shown) is in a neutral position and in a free state, the spring 32 stretches both spring seats 33 between steps of the valve cylinder so that the valve 22 is positioned between the spring seats 33 and is located in the center of the valve cylinder. The piston 6 is in the center. The O-ring 27 hits the valve seat 26, and the O-ring 30 hits the valve seat 34 to stop the compressed air at that position. O-ring 28 and O-ring 29
Have left the valve seat and opened the passage. Therefore, the cover side of the power cylinder is the cover side port 44,
The gap between the O-ring 29 and the valve seat 34, the valve 2
2 through the chamber with the spring 32 in the center of the exhaust port 4
It is connected to 7 and to the atmosphere.

The rod side of the power cylinder 42 is communicated with the atmosphere through the exhaust port 47 through the rod side port 45, the chamber having the spring 32 at the center of the clearance valve 22 between the O-ring 28 and the valve seat 26. The snap ring 10 fixes the piston 6 on the piston rod 11. The lever 17 connects the outer end of the valve 22 and the end of the piston rod 11 via metal fittings, and a shift cable (not shown) is attached to the shift cable attachment portion 49 to transmit force and movement therebetween. The holder 13 connects the end of the piston rod 11 and the lever 17.

The valve seat 26 has two valve seats, and when the O-ring abuts on the valve seat 26, the valve seat 26 becomes a seal, and the valve seat 26 effectively functions when the valve 22 moves to the rod side. The O-ring 27 is always fitted in the hole of the valve seat 26 to keep airtight. The O-ring 28 is always separated from the valve seat 26 and opens the passage. The O-ring 29 is always separated from the valve seat 34 and opens the passage. O-ring 30 is always valve seat 34
The hole is fitted to close the passage. The spring 32 always exerts a pushing force.

The spring seat 33 is constantly pushed by the spring 32. The valve seat 34 is kept airtight when the O-ring provided on the valve 22 comes into contact with the valve 22.
Works effectively when is moved to the cover side. The holder 36 loosely connects the valve 22 and the lever 17. The ball 37 allows the lever 17 fitted in the center thereof to tilt and slide in the axial direction.

When the shift lever (not shown) is operated to pull the shift cable (not shown) to the right in the figure, the lever 17
Rotates the pin at the small end of the holder 13 as an instantaneous center of rotation to move the valve 22 to the left while compressing the spring 32 to the left. Then, the O-ring 29 comes into contact with the taper portion of the valve seat 34 to cut off the communication between the cover side of the power cylinder 42 and the atmosphere, and then the O-ring 30 leaves the valve seat 34 to open the valve and the working compressed air to the cover-side port 44. Lead to.
The O-ring 27 contacts the valve seat 26 and remains closed.
The O-ring 28 moves further away from the valve seat 26.

The working compressed air passes between the valve seat 34 and the valve 22 and is blocked by the O-ring 29 at the end and enters the cover side of the power cylinder 42 from the cover side port 44.
The rod-side chamber of the power cylinder 42 is open to the outside air. The piston 6 is pushed by the compressed air to move to the rod side, and the piston rod 11 pushes the lever 17 to the right through the holder 13 to assist the shift force of pulling the shift cable (not shown) to the right. That is, the shift force applied from the outside may be small. When the shift is finished, the shift cable stops, and the movement of the shift cable mounting portion 49 of the stop lever 17 also stops.

Then, the valve 22 is pushed back by the force of the contracted spring 32 and moved to the rod side to move the O-ring 30.
Is in contact with the valve seat 34 and interrupts the passage of the working compressed air, the O-ring 29 leaves the valve seat 34, the port 44 on the cover side communicates with the atmosphere, and the cover side of the power cylinder 42 communicates with the atmosphere. Stop. Further, the spring seat 33 returns and hits the valve cylinder 43, and the valve 22 returns to the center position and stops. This completes the shift operation. In order to return the shift state to the neutral position, a shift lever (not shown) is operated to move the shift cable (not shown) to the left opposite to the shift.

The lever 17 rotates clockwise around the pin at the small end of the holder 13 as the center of instantaneous rotation, and moves the valve 22 to the right while compressing the spring 32 to the right. The O-ring 28 contacts the taper portion of the valve seat 26 to cut off the passage to the atmosphere, and the rod side port 45 is cut off from the atmosphere. Subsequently, the O-ring 27 leaves the valve seat 26 and opens the passage for working compressed air. The working compressed air communicating with the rod side of the valve cylinder 43 through the hole 48 passes between the valve 22 and the valve seat 26 and enters the rod side of the power cylinder 42 from the rod side port 45.

Since the cover side of the power cylinder 42 remains in communication with the atmosphere, the piston 6 is pushed to the cover side, and the piston rod 11 moves the lever 17 via the holder 13 to the cover side, that is, to the left to apply a force to move the shift cable. help. When the operation is finished, the shift cable (not shown) is stopped, and the shift cable attachment portion 49 of the lever 17 is stopped. The piston comes to the center of the power cylinder 42. The valve 22 moves to the left by the returning force of the spring 32 contracted to the right, and the O-ring 27 contacts the valve seat 26 to cut off the passage of the working compressed air to the rod side of the power cylinder 42.

Next, the O-ring 28 is attached to the valve seat 26.
And the rod side port 45 is communicated with the exhaust port 47 and the rod side of the power cylinder 42 is communicated with the atmosphere.
Stops. At this time, the piston 6 is located at the center of the power cylinder 42. The spring seat 33 hits the valve cylinder 43 and the valve 22 returns to the center position and stops. This completes the return of the shift lever to the neutral position.

The shift for moving the shift cable (not shown) to the left is the same as the action for returning from the right shift to the neutral position. The action of returning the state shifted from the left side to the neutral state is the same as that of moving the shift cable to the right side. In addition to the above embodiment, when the shift cable attachment portion 49 is provided in the middle of the attachment point of the holder 13 and the attachment point of the valve 22 with respect to the lever 17, the valve seat of the O-ring 27 of the valve seat 26 and the valve of the O-ring 28 are provided. The space between the seat and the rod-side port 45 is stopped, the space between the seat and the seat is communicated with the cover-side port 44 of the power cylinder 42, and between the valve seat of the O-ring 29 and the valve seat of the O-ring 30 of the valve seat 34. By stopping the communication with the cover side port 44 and communicating the space with the rod side port 45, the same operation and effect as in the first embodiment can be obtained.

[0029]

Since the present invention is constructed as described above, the output can be adjusted by changing the length ratio between the valve and piston rod mounting positions of the shift cable.
Since the difference between the shift cable mounting positions is small, the shift cable can be installed as it is. Moreover, the whole is short and light, and the mass of the moving part is small, and the exhaust passage is short and the response is fast. Therefore, the present invention can provide a power shifter which can adjust the output, does not need to change the arrangement of the shift cable, does not need a flexible tube for mounting the working compressed air source, and has a light response.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment according to the present invention.

FIG. 2 is a sectional view of a conventional example.

FIG. 3 is an operation explanatory view of a conventional example.

[Explanation of symbols]

 1 Case 2 Cover 6 Piston 11 Piston Rod 13 Holder 17 Lever 22 Valve 26 Valve Seat 27 O-ring 28 O-ring 29 O-ring 30 O-ring 32 Spring 33 Spring Seat 34 Valve-seat 42 Power Cylinder 43 Valve Cylinder 44 Cover Side Port 45 Rod Side port 48 Hole 47 Exhaust port 49 Shift cable attachment part

Claims (1)

Claims: 1. A valve cylinder (43) provided in a case (1), and two ports (4 provided in parallel with the valve cylinder (43) and communicating with the valve cylinder (43).
4) and a power cylinder (45) having (45), and a piston (6) provided in the power cylinder (42)
And a piston rod (11), a cover (2) for closing the end faces of the valve cylinder (43) and the power cylinder (42), and a pipe joint (46) provided on the valve cylinder side of the cover (2), Valve seats (26), (3) provided inside the valve cylinder (43) symmetrically with respect to the center in the longitudinal direction of the cylinder and each having two valve seats.
4) and the valve seat (26), which is coaxial with the valve cylinder (43) and extends outwardly through one cover.
An O-ring (27) is provided at a position facing each valve seat of (34),
A valve (22) having holes (48), (29), (30) in the center of the portion inside the valve cylinder and communicating both ends of the valve cylinder (43). ), A pressing spring (32) for returning the valve (22) to the central position, the end of the valve (22) and the end of the piston rod (11) are connected, and a shift cable attachment portion (4) is provided.
And a lever (17) having 9).