JPH0712758Y2 - Hydraulic actuator for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a hydraulic actuator for an automatic transmission that is compact and can be provided at low cost.

(Prior Art) A conventional automatic transmission is provided with a hydraulic control device for shift control. This hydraulic control device is provided with a plurality of spool valve type shift valves that operate according to a shift level.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional example, since a plurality of shift valves are provided according to the shift level, the hydraulic circuit is complicated and it is difficult to reduce the size. It was

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a shift cylinder rod that is rotatably inserted into a housing and that rotates during a shift, and a cylinder rod that is axially attached to the outer circumference of the cylinder rod. A select boss that rotates integrally with the rod, a hydraulic chamber that is formed in the housing and has a fan-shaped cross section that forms a part of a concentric circle from the outer peripheral surface of the select boss, and an inner side is formed on the outer periphery of the select boss. A vane that fits in a slit and has an outer periphery slidingly contacting the arcuate surface of the hydraulic chamber so as to traverse the inside of the hydraulic chamber in the radial direction, and withdraws from a predetermined position of the arcuate surface of the hydraulic chamber. A piston rod that is movably provided in the housing and is urged in the protruding direction; a first oil injection port that communicates with one of the hydraulic chambers partitioned by the vane; A second lubrication port communicating with the other of the hydraulic chambers partitioned by the valve
It is provided with a third oil supply port which communicates with the accommodating chamber of the piston rod and which, when a predetermined hydraulic pressure is applied, causes the piston rod to retract from the arcuate surface of the hydraulic chamber against the biasing force thereof.

(Operation) In the present invention, by applying the hydraulic pressure from the first and second oil injection ports to the vane, a rotational force is applied to the select boss to rotate the cylinder rod. Due to the change in the hydraulic pressure at this time, the rotational position of the vane is restricted, and the rotational amount of the select boss changes according to the rotational position to perform shift selection. Further, the pivot position of the vane can be regulated by retracting and retracting the piston rod due to the change in hydraulic pressure from the third oil supply port, whereby the pivot position of the select boss can be further regulated by one device. It is possible to set multiple shift levels.

(Embodiment) FIG. 1 is a front sectional view of a hydraulic actuator according to an embodiment of the present invention, and FIG. 2 is a side sectional view thereof.

A cylinder rod 2 for shifting is provided in a housing 1 provided in a hydraulic control device (not shown) of an automatic transmission (not shown).
Is rotatably inserted, and both ends thereof are oil-tightly sealed by O-rings 3 and 4. A concentric cylindrical select boss 5 is axially movably mounted by spline fitting on a part of the outer periphery of the cylinder rod 2 in the housing 1. Therefore, the select boss 5 rotates integrally with the cylinder rod 2.

A hydraulic chamber 6 having a fan-shaped cross section forming a part of a concentric circle from the outer peripheral surface of the select boss 5 is formed in the housing 1. Then, inside the hydraulic chamber 6, the inner side is fitted into the slit 7 formed on the outer periphery of the select boss 5, and the outer side is slidably contacted with the arcuate surface 8 of the hydraulic chamber 6 to form the hydraulic chamber 6. A vane 9 is provided which is arranged so as to traverse the inside in the radial direction. This vane 9 has an internal space 10
The outer side of the spring 11 is pressed into contact with the arcuate surface 8 by the spring 11 inserted in.

A housing chamber 12 is provided above the hydraulic chamber 6 of the housing 1.
The storage chamber 12 is provided with a spring 13
The piston rod 14 is urged downward by. The tip of the piston rod 14 can be retracted in an oiltight state from an opening 15 formed at a predetermined position (a position displaced to the right of the center in FIG. 2) of the arcuate surface 8 of the hydraulic chamber 6. Is.

Then, a first oil injection port communicating with one of the hydraulic chambers 6 partitioned by the vanes 9 (left side in FIG. 2).
16, a second oil filling port 17 communicating with the other, and a third oil filling port 18 communicating with the accommodating chamber 12 of the piston rod are penetratingly formed. The first oil filling port 16 is open to the left wall 19 of the hydraulic chamber 6, and the second oil filling port 17 is to the right wall.
It is open to 20. The third oil filling port 18 is open at the lower end side surface of the piston rod housing chamber 12.

Next, the operation of this embodiment will be described.

The number of hydraulic actuators of this embodiment is one and two,
It is possible to perform 3 shift selections of 3rd, 4th and 5th.

First, when selecting the 1st or 2nd speed, the drain pressure is applied to the first oil inlet 16 and the operating pressure is applied to the second oil inlet 17. As a result, the vane 9 is pressed against the left wall 19, and the select boss 5 rotates as the vane 9 rotates, and the integral cylinder rod 2 rotates. The turning position of the cylinder rod 2 at this time corresponds to the select positions for the first and second speeds.

At this time, the third oil supply port 18 has a drain pressure, and the tip of the piston rod 14 projects from the opening 15 by the urging force of the spring 13.

Next, when selecting the 3rd or 4th speed, the operating pressure is supplied to the first oil filling port 16 and the second oil filling port 17 is set to the drain pressure. Also, the third
The oil injection port 18 also causes the piston rod 14 to project into the oil injection chamber 6 as a drain pressure. As a result, the vane 9 has a wall 20 on the right side.
Rotate in the direction of. At this time, since the outer side of the vane 9 comes into contact with the tip of the projecting piston rod 14, rotation of the vane 9 is prevented at that position. The cylinder rod 2 also rotates with the rotation of the vane 9 at this time, and the rotation position of the cylinder rod 2 is restricted at a position where the rotation position of the vane 9 is restricted by the piston rod 14. This restricted rotational position corresponds to the 3rd and 4th speed select positions.

Next, at the time of selecting the fifth speed, the operating pressure is supplied to the third oil filling port 18 from the state at the time of selecting the third and fourth speeds. This third
The operating pressure supplied to the oil filling port 18 of the piston rod
The reference numeral 14 moves upward, and its tip is immersed in the opening 15. As a result, the vane 9 whose rotation has been restricted until then is released and rotates to a position where it comes into contact with the right wall 20. The cylinder rod 2 rotates with the rotation of the vane 9 at this time, and the rotation position of the cylinder rod 2 at this time corresponds to the fifth speed select position.

(Effect of the Invention) As described in detail above, according to the present invention, the rotational position of the vane for rotating the shift cylinder rod can be restricted to a plurality of positions by switching the pressures of a plurality of oil inlets. This makes it possible to set a plurality of different shift levels with one device.

Therefore, according to the present invention, the number of parts of the hydraulic control device can be reduced, and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a front sectional view showing the construction of an embodiment of the present invention, and FIG. 2 is a side sectional view thereof. 1 ... Housing, 2 ... Cylinder rod 5 ... Select boss, 6 ... Hydraulic chamber 7 ... Slit, 8 ... Arc surface 9 ... Vane, 12 ... Storage chamber 14 ... Piston rod, 16 ... … First lubrication port 17 …… Second lubrication port, 18 …… Third lubrication port

Claims (1)

[Scope of utility model registration request] 1. A shift cylinder rod that is rotatably inserted in a housing and that rotates during a shift, a select boss that is axially attached to the outer periphery of the cylinder rod, and that rotates integrally with the cylinder rod, and that is formed in the housing. A hydraulic chamber having a fan-shaped cross section forming a part of a concentric circle from the outer peripheral surface of the select boss, and an inner side fitted into a slit formed on the outer periphery of the select boss, and an outer side being an arcuate surface of the hydraulic chamber. A vane that is arranged so as to slide and cross the inside of the hydraulic chamber in a radial direction, and a vane that can be retracted from a predetermined position on an arcuate surface of the hydraulic chamber and that is urged in a protruding direction. A piston rod, a first oil inlet communicating with one of the hydraulic chambers partitioned by the vanes, and a second oil inlet communicating with the other of the hydraulic chambers partitioned by the vanes. An oil port and a third oil port communicating with the accommodating chamber of the piston rod and allowing the piston rod to retract from the arcuate surface of the hydraulic chamber against a biasing force when a predetermined hydraulic pressure is applied. A hydraulic actuator for an automatic transmission, which is characterized in that