JPH1144361A - Pressure regulator valve for automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure regulator valve which is not influenced by a temperature change. SOLUTION: A spool 1 is inserted into a spool hole 9 of a control valve body 30, and a hollow cylindrical sleeve 4 brought into close contact with its inner peripheral surface is arranged in a plug valve hole 8. A first seal member 7 existing on the opening side of the plug valve hole 8 is constituted of the same aluminium material as the control valve body 30, and seals the plug valve hole 8. In a second seal member 5, a circumferential surface is brought into close contact with the inner peripheral surface of the plug valve hole 8, and an end surface receives a spring 3, and the other end surface is brought into close contact with an end surface of the sleeve 4 by reaction of the spring. A plug 20 is slidably installed in the sleeve 4, and its tip is constituted so as to capable of coming into contact with the spool 1. Therefore, the first seal member 7 can seal an opening of the plug valve hole 8 without being influenced by a temperature change, and a line pressure drop brought about by reduction in driving force applied to the plug by leakage of oil can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a pressure regulator valve for an automatic transmission.

[0002]

2. Description of the Related Art Automatic transmissions have various friction elements (clutch,
The automatic transmission is switched by switching the power transmission path by the selection operation of a brake or the like. A hydraulic device is used to operate these friction elements. The hydraulic device includes a pump for generating pressure oil and various pressure valves for adjusting hydraulic pressure. The pressure valve controls the hydraulic pressure generated by the pump in accordance with the running state of the vehicle and the selected friction element to generate an appropriate frictional force. The pressure regulator valve connected to the discharge side of the pump performs such a function, and regulates the line pressure of the piping including the friction element and leading to the entire automatic transmission. FIG. 3 shows the configuration.

A spool 51 provided in the control valve body 50 receives a hydraulic pressure from an oil pump (not shown) on an end face 62 and applies an urging force in a direction to increase the opening of an orifice formed between the land 60 and the port 61. obtain. On the other hand, the spring 53 applies a force against the hydraulic pressure to the spool 5.
1 to balance the spool 51 to keep the opening area of the orifice constant.

A plug valve 63 which operates upon receiving a signal pressure
Outputs a force corresponding to the signal pressure and applies a force opposing the hydraulic pressure to the spool 51. That is, when the pressure oil having the signal pressure flows from the first oil hole 57 into the oil chamber 59 in the sleeve 55, the pressure and the thrust converted by the pressure receiving area are converted to the pressure by the plug 5.
2 and transmitted to the spool 51. This thrust causes the spool 51 to move rightward in the drawing, resulting in a narrower opening of the orifice.

[0005] Since the orifice is connected to a pipe on the control piston side that adjusts the output flow rate of the oil pump, when the opening area of the orifice is reduced, the oil pressure applied to the control piston is reduced, and the pump is operated more. Pressure oil will be output to the piping. As a result, the line pressure increases. The increase in line pressure leads to an increase in hydraulic pressure acting on the end face 62 of the spool 51, and the spool 5
A new force balance is brought to 1 and a line pressure is generated in the pipe which corresponds to the signal pressure. The second oil hole 58 is used in the case of a reverse (R range) requiring a larger line pressure.

[0006] Since high precision is required for the sliding surface, the sleeve 55 and the plug 52 are made of the same iron alloy.
Therefore, even if the temperature changes, the sleeve 55 and the plug 5
The clearance between the oil chambers 59 and 64 is prevented from being increased without increasing the clearance between the oil chambers 2 and hindering sliding.

[0007]

However, the clearance between the control valve body 50 made of aluminum alloy and the sleeve 55 made of iron alloy increases as the temperature rises due to the difference in the thermal expansion coefficient. The bottom wall of the sleeve 55 functions as a stopper when the plug 52 is pushed by the spool 51 and retreats. The first oil hole 57 allows the oil to flow smoothly without being affected by the retraction of the plug 52. It must be provided close to the bottom wall. Therefore, the length of the seal between the first oil hole 57 and the external space is only the thickness of the bottom wall. If the clearance is enlarged, oil leakage occurs, and a predetermined thrust cannot be generated in the plug 52. , Resulting in a decrease in line pressure.

As for the workability, since the sleeve 55 is a cylinder having a bottom wall, counterbore processing is used.
It takes time and effort. The pin 56, which determines the mounting depth when the sleeve 55 is mounted on the control valve body 50, requires high precision in the dimensions of the inner surface of the bottom wall as a stopper, but there is also a problem that it is difficult to guarantee the precision. . In view of the above-mentioned conventional problems, the present embodiment has an object to provide a pressure regulator valve which has a structure which is easy to process, eliminates oil leakage due to a change in temperature, and is not affected by a change in temperature.

[0009]

According to a first aspect of the present invention, a spool is inserted into a spool hole formed in a control valve body, and is disposed on a circumferential surface on an opening side of the spool hole. A hollow cylindrical sleeve having an oil hole that opens into an oil passage formed in the control valve body is provided, seal members are provided at both ends of the sleeve, and a first disc-shaped sleeve is provided on the opening side of the spool hole. A seal member seals the spool hole, and is fixed to the control valve body by a retainer. A second seal member on the spool side has a circumferential surface in close contact with an inner circumferential surface of the spool hole, and an end surface of the spool member. The other end face is brought into close contact with the end of the sleeve by the reaction force of the spring, and the sleeve is actuated by inflow of pressure oil from the oil hole into the sleeve. That the plug is provided, and as the tip of the plug is configured to contact with the spool projecting the second sealing member.

According to a second aspect of the present invention, the sleeve is a hollow cylinder having a diameter different from that of a substantially central portion, and four first oils are formed by partially cutting out a small-diameter end portion at an equal distance in a circumferential direction. A hole is formed, a part is cut out annularly from inside and outside of the cylindrical wall including the oil hole to form a thin portion, and a through-hole is formed in the large-diameter and small-diameter joints to form a second oil hole. The second oil hole was formed, and a part was cut out from inside and outside of the cylindrical wall so as to form a thin portion. The first seal member can function as a stopper when the plug is pushed back. Preferably, the first seal member and the control valve body are made of the same aluminum material.
The sleeve and the plug are preferably made of the same iron alloy.

[0011]

According to the first aspect of the present invention, the first seal member seals the opening of the spool hole, thereby preventing oil leakage from the inner peripheral surface of the spool hole even when a hollow cylindrical sleeve is used. If stopped, an oil chamber for driving the plug is formed. Because of the long contact surface between the sleeve and the spool hole, the clearance for sealing oil leakage is large. Thus, the sleeve and the plug can be made of the same material, and the first seal member and the control valve body can be made of the same material. Therefore, the clearance between the plug and the sleeve can maintain good sliding characteristics without a change in temperature, and a sealing effect that is not affected by the change in temperature can be obtained.

Further, since the spool has a hollow cylindrical configuration, the counterbore processing is not required, and the effect of reducing labor and processing cost can be obtained. Furthermore, when the plug is operated, the oil port through which the pressure oil passes can be cut out and machined.
The processing is simplified, and the oil hole is formed at the end of the sleeve, so that even if the plug retreats, the plug is not interrupted and the effect of smoothly flowing the pressure oil can be obtained.

[0013]

Embodiments of the present invention will be described below with reference to embodiments. FIG. 1 is a sectional view showing the configuration of the present embodiment. The spool 1 is slidably inserted into the spool hole 9 of the control valve body 30 made of an aluminum alloy. The spool 1 has lands 12, 13, 14, and 15, between which oil chambers a, b, and c are formed. Oil chamber a formed between land 12 and land 13 is port A
Through an oil pump (not shown) to a pressure oil supply pipe leading to the transmission. An orifice 17 is provided in the oil passage.

An oil chamber b formed between the land 13 and the land 14 communicates with the reservoir through a port B. The oil chamber c formed between the land 14 and the land 15 is a port C
Through the pressure oil supply pipe leading to the transmission.
The port D is a port for performing a sequence control for supplying pressure oil entering the port C to the torque converter when the spool 1 is displaced leftward in the drawing. The land 12 has a smaller diameter than the other lands, and the hydraulic pressure from the port A generates an urging force corresponding to the area difference on the spool 31. A spring 3 is provided at the left end of the spool

The valve hole 8 which communicates with the spool hole 9 and has an enlarged diameter.
The second sealing member 5 is inserted through the opening, and then the sleeve 4 having the slidable plug 20 mounted therein and the first
The sealing member 7 is also pressed into a predetermined position. The second seal member 5 has a circumferential surface in close contact with the inner peripheral surface of the valve hole 8, an end surface receiving the spring 3, and a close contact with the sleeve 4 by the reaction force. Thereby, the sleeve 4 and the valve hole 8 are sealed.

On the other hand, the first seal member 7 is made of the same aluminum alloy as the control valve body 30, and its circumferential surface is in close contact with the inner peripheral surface of the valve hole 8 to seal the opening of the valve hole 8. Outside the plate is a plate-shaped retainer 6.
It is fixed to the control valve body 30 in a state where it abuts on the seal member 7. This prevents the first seal member 7 from moving outward and prevents the oil from leaking out when the plug 20 is driven.

The sleeve 4 and the plug 20 are connected to the plug valve 2
The sleeve 4 has a first oil hole 10 and a second oil hole 10 in the circumferential direction.
The control valve body 3 having an oil hole 11 and an outer peripheral surface
The control valve body 30 is provided so that the oil hole is in close contact with the oil passage. The plug 20 has pistons 18 and 19 having different diameters and is slidable in the sleeve 4. An oil chamber 31 having a second oil hole is formed between the small-diameter piston 18 and the large-diameter piston 19. And
An oil chamber 32 having a first oil hole is formed between the end of the small-diameter piston 18 and the first seal member 7.

FIG. 2 shows the detailed structure of the sleeve 4. Thick portion 2 of hollow cylinder 70 having thick portion 26 and thin portion 27
A thin ring-like shape in which four notches 10 are formed as first oil holes at equal distances in the circumferential direction at the end of 6, and the cut-outs 10 are partially cut from inside and outside of the wall to form the cut-outs. The oil groove 21 is formed inside the protrusion 25 and the oil groove 22 is formed outside. These oil grooves evenly distribute the pressure oil to each of the first oil holes to reduce the resistance at the time of inflow and outflow. Four through holes 11 are formed at substantially the center of the hollow cylinder 70 at equal distances in the circumferential direction as second oil holes. Ring-shaped oil grooves 23 and 24 are formed from inside and outside the wall including the through hole 11. The oil grooves 23 and 24 divide pressure oil equally into each of the second oil holes to reduce resistance at the time of inflow and outflow.

The first oil hole 10 is communicated with a signal pressure output side of a pressure modulating file valve for generating a signal pressure by an oil passage formed in the control valve body 30. The second oil hole 11 is connected to a valve that controls generation of line pressure by an oil passage formed in the control valve body 30. When a signal pressure is output from the pressure modi? Ed valve, pressure oil having a signal pressure flows from the? Rst oil hole 10 into the oil chamber 32. The plug 20 is pushed by the pressure oil and moves rightward in the figure, and pushes back the spool 1 which is balanced by the oil pressure from the port A and the urging force of the spring 3 with the thrust converted by the pressure receiving area. As a result, the opening area of the orifice formed between the land 14 and the port C decreases, and the amount of oil drained from the port B to the reservoir decreases.

As the amount of drained oil decreases, the energy loss decreases and the line pressure generated in the piping increases. Due to the increase in the line pressure, the balance of the force is restored in the spool 1, and a line pressure corresponding to the signal pressure is generated in the pipe. When the vehicle is in reverse (R range), oil having line pressure flows into the oil chamber 31 from the second oil hole 11,
The plug 20 displaces the spool 1 with a larger driving force, and generates a larger line pressure. Then, even if the discharge pressure of the oil pump fluctuates, the spool 1
Is displaced to absorb the fluctuation, the line pressure follows the signal pressure in a unified manner.

The present embodiment is constructed as described above, and since the sleeve is formed in a hollow cylindrical shape, counterbore processing is unnecessary and simple processing can be performed. In addition, since the first oil hole is formed by notching, the processing is simplified, and the first oil hole is most notably formed.
Pressure oil can flow into the oil chamber 32 from a position close to the seal member 7. As a result, the plug 20 is connected to the spool 1
Even when pushed back and in contact with the first seal member 7, the pressure oil spreads over the end face of the plug 20, and the plug can be moved smoothly.

Further, a plurality of oil holes are provided in the sleeve, and the oil grooves inside and outside the oil holes disperse the flowing pressure oil into other oil holes and flow into the oil chamber. The quality is improved and good quality pressure control can be performed. In addition, since the first seal member and the control valve body are made of the same aluminum material, and the plug and the sleeve are made of the same iron alloy, even if the temperature changes, the clearance does not expand at the contact portion, and stable adjustment can be achieved. Pressure is applied. In the present embodiment, the line pressure adjustment is described based on the amount of drained oil. However, the present invention is not limited to this, and the pressure adjustment method of the control piston adjustment method can be used.

[0023]

According to the present invention, since the first sealing member seals the opening of the spool hole, the sleeve can be formed as a hollow cylinder. As a result, the same material can be used for the first seal member and the control valve body, and a sealing effect that is not affected by temperature changes can be obtained. Further, since the same material can be used for the sleeve and the plug, smooth sliding and prevention of oil leakage are maintained as in the related art. Also, counterboring is not required, and the processing cost is reduced.

Also, the first seal member can function as a stopper when the plug is pushed back to the spool. In this case, since the processing of the disk is simple and the processing accuracy is easily guaranteed, an effect of not increasing the processing cost can be obtained. In addition, when the plug is operated, the oil port through which the pressure oil passes can be cut out to perform the processing, so that the processing is simplified, and even if the plug retreats due to the oil hole being formed at the end of the sleeve. The effect of smoothly flowing the pressure oil without interruption is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment.

FIG. 2 is a diagram showing a configuration of a sleeve.

FIG. 3 is a diagram showing a conventional example.

[Explanation of symbols]

 1, 51 Spool 2, 63 Plug valve 3, 52 Spring 4, 55 Sleeve 5 Second seal member 6 Retainer 7 First seal member 8 Valve hole 9 Spool hole 10, 57 First oil hole 11, 58 Second oil hole 13 , 14, 15, 15 Land 17 Orifice 18 Small Diameter Piston 19 Large Diameter Piston 20 Plug 30, 50 Control Valve Body 70 Hollow Cylinder 21, 22, 23, 24 Oil Groove 25 Projection 26 Thick Part 27 Thin Part 31 Second Oil Chamber 32 First oil chamber 56 Pin 59 Oil chamber

Claims (5)

[Claims] 1. A spool is inserted into a spool hole formed in a control valve body and arranged.
A hollow cylindrical sleeve having an oil hole that opens to an oil passage formed in the control valve body is provided on a circumferential surface on an opening side of the spool hole, and a seal member is provided at both ends of the sleeve. A first disc-shaped seal member on the opening side of the seals the spool hole, and is fixed to the control valve body by a retainer,
The second seal member on the spool side has a circumferential surface in close contact with the inner circumferential surface of the spool hole, an end surface of which receives a spring that applies a biasing force to the spool, and the other end surface of the sleeve is reacted with a spring by the spring. The sleeve is provided with a plug which is actuated by the inflow of pressure oil from the oil hole in the sleeve, so that the tip of the plug can protrude from the second seal member and come into contact with the spool. A pressure regulator valve for an automatic transmission. 2. The sleeve is a hollow cylinder having a diameter different from a substantially center, and is partially notched at an end of a small diameter at an equal distance in a circumferential direction to form four first oil holes. A part is cut out annularly from inside and outside of the cylindrical wall to include the first oil hole to form a thin portion, and a through hole is formed in the large diameter and small diameter joint to form a second oil hole. 2. The pressure regulator valve for an automatic transmission according to claim 1, wherein a part is cut out from inside and outside of the cylindrical wall to include the second oil hole to form a thin portion. 3. The pressure regulator valve for an automatic transmission according to claim 1, wherein the first seal member functions as a stopper when the plug is pushed back. 4. The pressure regulator valve for an automatic transmission according to claim 1, wherein said first seal member and said control valve body are made of the same aluminum material. 5. The pressure regulator valve for a transmission according to claim 1, wherein the sleeve and the plug are made of the same iron alloy.