JPH0567833B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid pressure actuator, and particularly to an actuator suitable for shifting operations in a vehicle transmission.

For example, when shifting an automatic transmission using a fluid pressure actuator, the operation is simple if only a shift actuator is used, but as the number of gears in the transmission increases, the number of actuators increases.

By the way, in manual gear shifting operations, multiple gears are changed by operating in two directions, select and shift. Therefore, by using two actuators, select and shift, gear shifting can be performed regardless of the number of gears. can.

However, what is the select direction and shift direction?
There is a 90° phase difference, and it is mechanically difficult to transmit movement in these two directions to the internal lever that operates the shift rod of the transmission.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shift actuator that has a simple structure and is highly efficient in that the operating forces of the two actuators can be applied directly to the internal lever.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In FIGS. 1 to 3, 1a and 1b are casings consisting of two blocks, and one casing 1a has a first actuator 2 (referred to as a select actuator in this embodiment) and a clutch actuator 3. A second actuator 4 (referred to as a shift actuator in this embodiment) is disposed in the other casing 1b in a direction perpendicular to the select actuator 2.

As shown in FIG. 2, the select actuator 2 includes a stepped cylinder 20 formed in the casing 1a and consisting of a small diameter portion 21 and a large diameter portion 22, and is slidably disposed within the small diameter portion 21. A first piston 23 and a piston rod 231 protruding from one side of the first piston 23 are slidably fitted, and the small diameter portion 21 and the large diameter portion 22 of the cylinder 20 are connected to each other.
A cylindrical second piston 24 consisting of a small diameter portion 241 and a large diameter portion 242 that are slidably disposed therein.
It is made up of. The pressure receiving area of the first piston 23 on the side of the hydraulic chamber 21a, that is, the annular area obtained by subtracting the cross-sectional area of the other piston rod 232, is larger than the cross-sectional area of the one piston rod 231. Therefore, when hydraulic pressure is applied to the hydraulic chambers 21a and 22a of the stepped cylinder 20,
The large diameter portion 242 of the second piston 24 comes into contact with the shoulder 20a of the stepped cylinder 20, and the first piston 23 comes into contact with the second piston 24 as shown in FIG. 2, and only the hydraulic chamber 21a When hydraulic pressure is applied to the hydraulic chamber 22, the first piston 23 and the second piston 24 move to the right in the figure.
When hydraulic pressure is applied only to a, the state shown in the diagram changes to the first
Only the first piston 23 is actuated to the left, allowing the first piston 23 to be actuated into three positions.

Reference numeral 5 designates an internal lever disposed within the casing 1b, which has a hole 5a formed in its intermediate portion, and a stepped small diameter portion 25a of the rod 25 screwed to the piston rod 232 of the first piston 23. It is rotatably mounted on the Note that one end of the internal lever 5 is for 1st-2nd speed and 3rd-speed.
It is designed to engage appropriately with shift blocks 6a, 6b, and 6c attached to shift rods for 4th speed and 5th speed-reverse, respectively.

7a, 7b, and 7c are select position switches disposed at the ends of the rods 25, and select position switches 7a, 7b, and 7c for selecting the first piston position, that is, the third position of the internal lever 5.
It detects two operating positions.

The shift actuator 4 has the same structure as the select actuator 2, and is a stepped cylinder consisting of a small diameter part 41 and a large diameter part 42 formed in the casing 1b, as shown in FIG. 40
a first piston 43 that is slidably disposed within the small diameter portion 41; and a piston rod 431 that protrudes from one side of the first piston 43 and is slidably fitted into the small diameter portion of the cylinder 20. A small diameter portion 44 slidably disposed within the portion 41 and the large diameter portion 42.
1 and 442, and similarly to the select actuator 2, by applying hydraulic pressure to the hydraulic chambers 41a and 42a, the hydraulic chamber 41a is moved to the neutral position shown in the figure. By applying hydraulic pressure only to the hydraulic chamber 42a, the first piston 43 is moved to the right in the figure, and by applying hydraulic pressure only to the hydraulic chamber 42a, the first piston 43 is moved to the left in the figure. I'm starting to be able to do it.

Reference numeral 8 denotes an actuating member that is screwed to the end of the piston rod 432 that protrudes from the other side of the first piston 43 of the shift actuator 4, and has a gap that engages with the other end of the internal lever 5. As shown in FIG. 2, the gap 8a is configured to allow operation of the internal lever 5 operated by the select actuator 2 without interfering with the lever. .

9 is a rod whose one end is fixed to the actuating member 8;
Shift position switches 11a, 11b, and 11c are provided at the other end of the rod 9 and detect the position of the first piston 43, that is, the three rotational positions of the internal lever 5.

The clutch actuator 3 includes a cylinder 31 formed in the casing 1a as shown in FIG.
A piston 32 slidably disposed within the cylinder, a piston rod 33 connected to the piston, and a position detection sensor 35 such as a potentiometer that detects the movement of the rod 34 connected to the piston 32. The piston rod 33 is connected to a clutch release lever via a link (not shown) or the like.

The shift actuator according to the present invention is constructed as described above, and its operation will be explained below.

In the illustrated state, both the select and shift actuators are in the neutral position, and the internal lever 5 is in the neutral position.
As shown in the figure, one end is engaged with the shift block 6b of the 3rd-4th speed shift rod. From this state, by applying hydraulic pressure to the hydraulic chamber 42a or 41a of the shift actuator 4, the first piston 43 moves to the left or right in FIG.
2, the internal lever 5 is rotated counterclockwise or clockwise about the rod 25, and the shift block 6b engaged with the internal lever 5 is rotated to the right. Alternatively, it can be moved to the left to shift to third or fourth gear.

When shifting from the third or fourth gear to, for example, the fifth gear, first apply hydraulic pressure to the hydraulic chambers 41a and 42a of the shift actuator 4 to move the first piston 43 as shown in the figure. Then, the first piston 23 is moved to the left in FIG. 2 by applying hydraulic pressure to the hydraulic chamber 22a of the select actuator 2, and the piston rod 232 of the first piston 23 is The internal lever 5 attached to the connected rod 25 is moved to the left in the figure to operate the shift block 6c provided on the 5th speed-reverse shift rod.

When the internal lever 5 is operated to the position corresponding to the shift block 6c, hydraulic pressure is applied to the hydraulic chamber 42a of the shift actuator 4 to move the first piston 43 to the left in FIG. By rotating the null lever 5 counterclockwise about the rod 25, the shift block 6c can be moved to the right in FIG. 3 to complete the shift to the fifth speed.

In this way, by alternately operating the shift actuator 4 and the select actuator 2, it is possible to perform a disguise operation to each gear stage.

The clutch actuator 3 is operated by applying hydraulic pressure to the hydraulic chamber 31a and moving the piston 31 to the right, thereby operating the clutch release lever in the clutch disengagement direction via the piston rod 33 and a link mechanism (not shown). and hydraulic chamber 31
By releasing the hydraulic pressure acting in a, the piston 32 is moved to the right in FIG. 2 by a clutch spring (not shown) to engage the clutch. This clutch disconnection operation is performed by piston 3.
The movement of the rod 34 connected to the clutch 2 can be detected by a potentiometer 35, and the engaged state of the clutch can be detected electrically.

By configuring the clutch actuator 3 integrally with the select actuator 2 and the shift actuator 4 in this way, the shift actuator and clutch actuator for an automatic transmission can be configured compactly. can.

As described above, the shift operation actuator according to the present invention includes first and second actuators that are perpendicular to each other, an internal lever that is attached to the piston rod of the first actuator, and an internal lever that is attached to the piston rod of the second actuator. and an actuating member having a recess that engages with the inner lever and allows the first actuator to operate the internal lever.
With a simple structure, it is possible to perform multi-speed gear shifting operations using two actuators.

Further, since the internal lever is directly operated by the first and second actuators without using a link mechanism or the like, it is possible to obtain a shift operation actuator with high operating efficiency.

In this embodiment, the first actuator 2 is a select actuator and the second actuator is a shift actuator, but the first actuator 2 is a shift actuator and the second actuator is a shift actuator. may also be used as a select actuator, in this case 90° on the horizontal plane.
Place it in a rotated position.

FIG. 4 shows another embodiment of the sector actuator and shift actuator.

In the figure, 50 is a cylinder with a stepped portion 50 in the center.
It is provided with cylinder holes 51 and 52 having diameters a. A first piston 53 is slidably disposed in the cylinder hole 51, and a piston rod 54 is integrally formed therein. A second piston 55 is slidably disposed in the cylinder hole 52, and a piston rod 56 is integrally formed with the piston rod 56, so that the piston rod 56 comes into contact with the first piston 53 as appropriate. There is. The cylinder 50
is provided with three hydraulic chambers 57a, 57b, and 57c, and by applying hydraulic pressure to the hydraulic chamber 57a, the first piston 53 is moved to the second piston 5.
5 to the right in the figure, and the hydraulic chamber 57
By applying hydraulic pressure to b, the first piston 5
3 to the left in the figure and apply hydraulic pressure to the hydraulic chambers 57a and 57c to move the first and second pistons to the illustrated neutral position,
The first piston 53 can be operated to three positions, and the same effects as the select actuator 2 and shift actuator 4 shown in the above embodiment can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an actuator for speed change operation according to the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line -- in FIG.
FIG. 4 is a sectional view of a main part showing another embodiment of the present invention. 1a, 1b...Casing, 2...Select actuator, 4...Shift actuator, 5
...Internal lever, 6a, 6b, 6c...
Shift block, 8... Operating member.

Claims (1)

[Claims] 1 a first actuator consisting of a cylinder and a piston, and a first actuator consisting of a cylinder and a piston;
a second actuator disposed perpendicular to the actuator; an internal lever rotatably attached to the piston rod of the first actuator; and an internal lever attached to the piston rod of the second actuator. A shift block attached to a reverse shift rod is engaged with an operating member having a recess that engages and allows the first actuator to operate the internal lever, and one end of the internal lever is engaged with a shift block attached to a reverse shift rod. Characteristic fluid pressure actuator.