WO2010044520A1

WO2010044520A1 - Hydraulic auto-tensioner for vehicle

Info

Publication number: WO2010044520A1
Application number: PCT/KR2009/001231
Authority: WO
Inventors: 김남수; 오임식
Original assignee: 지엠비코리아 주식회사
Priority date: 2008-10-15
Filing date: 2009-03-12
Publication date: 2010-04-22
Also published as: KR101085293B1; KR20100042008A

Abstract

The present invention which relates to the structure of a check valve and an oil seal in an auto-tensioner comprises a cylinder, the check valve, and the oil seal. A piston coupled with a piston housing is inserted into the cylinder which is press-fitted into an outer housing filled with hydraulic fluid. The check valve composed of a check ball supported by a check valve spring installed in a check valve cover is installed on a check valve sheet installed at the lower end of the piston. A fluid path is formed in the check valve sheet and the piston. The oil seal is installed between the outer housing and the piston housing and has two surfaces which respectively contact the outer and piston housings, wherein the surface contacting the outer housing is corrugated and the surface contacting the piston housing has a lattice-shaped groove thereon. A spiral air vent path is formed at the upper part of the lattice-shaped groove in order to connect the lattice-shaped groove to an air vent groove formed at the lower part of a fixed end.

Description

Automotive Hydraulic Auto Tensioner

The present invention relates to an actuator of a hydraulic auto-tensioner for automobiles, and more particularly, to simplify the configuration of the actuator internal structure and the damping mechanism, thereby facilitating the processing of the ball seat and the flow path in which the ball blocks the oil flow. In addition, the present invention relates to preventing the oil from leaking when the air is discharged because the oil and the air are separated when the expanded air is discharged from the air vent of the oil seal which discharges the expanded compressed air in the oil storage chamber.

In the Front End Accessory Drive System (FEADS), the Hydraulic Auto Tensioner is a device that automatically adjusts the tension of the engine belt drive system. To reduce noise and maintain tension in the situation, autotensioners meet the longevity of belt drive systems and engine reliability.

Tension control device for vehicle engine is installed in the engine of the car, and there is a tension belt adjustment device for timing belt for interlocking rotation of the crankshaft, camshaft, etc. and belt tensioner for bogies for adjusting the belt tension of engine accessories, and each belt tensioner Has a mechanical autotensioner by mechanical spring and a hydraulic autotensioner that combines mechanical spring and hydraulic force.

In the conventional hydraulic autotensioner, US Pat. No. 6,106,424 (registered on Aug. 22, 2008), a pivot bushing 11, which is press-fitted into the piston housing 10, is connected to the tensioner roller by bolts, and the piston 8 is a piston. As integrally connected to the housing 10, the piston makes an up or down stroke reciprocation in the cylinder as a load is added or removed from the belt.

In other words, the piston is slid through the gap that is loosely fitted in the cylinder 6 arranged in the outer housing 2.

When the piston is downstroked, the volume in the cylinder decreases and the pressure in the pressure chamber becomes high, causing the ball of the check valve 15 installed in the cylinder to block the oil flow path so that the oil does not flow out and close the cylinder 6 and the piston clearance. Exit the storeroom.

When the piston 8 is upstroked, the volume in the cylinder is increased, the pressure chamber is lowered in pressure, and the check valve ball installed in the cylinder rises to form an oil flow path so that oil flows from the storage chamber 4 of the outer housing.

In another prior art, KR Patent Publication No. 2000-34652 (2000.06.26) discloses that a sleeve 14 is mounted in a body 11 filled with hydraulic oil, as shown in FIG. It forms a reservoir chamber (14b) for storing the hydraulic oil and the lower portion forms a high-pressure chamber (14c) receiving the hydraulic fluid is introduced into the hydraulic chamber, the hole 15a penetrated up and down in the center of the plunger 15 is formed. The lower end of the plunger 15 is provided with a plunger spring 15d for exerting a compressive or stretching force and a check ball 15b that opens and closes the hole 15a when the plunger moves up and down. A rod 12 is provided to move the plunger 15 up and down by interlocking with the tension pulley 10b according to the tension of 70. A flange portion 12b is formed at an upper end of the rod 12. At the bottom, the hole 15a of the plunger 15 An actuator of a hydraulic hydraulic tensioner for an automobile in which a hole 14a is formed, the rod inserting portion 16a inserted into the rod 12 and surrounding the outer circumferential surface of the rod 12; A fixed flange 16b fixed to the flange portion 12b, and a compression flange 16c embedded in the sleeve 14 to apply a compressive force to the hydraulic oil in the reservoir chamber 14b when the rod 12 moves. An actuator of a hydraulic autotensioner is known, characterized in that the member 16 is provided.

The present invention is to provide a check valve that is a problem with US6106424 in the bottom surface of the outer housing to form a flow path on the bottom surface of the outer housing and to solve the difficulty of precisely processing the ball seat contacting the ball KR2000- As shown in No. 34652, the check valve is provided at the lower end of the check valve seat coupled to the end of the piston, but the structural complexity of the patent is simplified to improve the reliability of the hydraulic autotensioner and to reduce the processing and assembly costs. It is an object to provide a configuration.

In addition, the present invention is the oil seal that maintains the airtight of the storage compartment in which the operating oil is stored is separated from the expanded air and the oil when the operating oil and the air in the storage compartment is expanded through the air vent by the friction heat generated by the up / down stroke of the piston To provide a configuration that prevents oil from leaking.

According to the present invention, a cylinder-shaped lower end portion is sealed in the outer housing and an upper end portion is press-fitted to the cylinder, and a check valve seat having a check valve is inserted into the cylinder so that the check valve seat is coupled to the piston, and the flow path of the check valve Are formed on the check valve seat and the piston.

In addition, a spring embedded between the piston and the outer housing is configured to generate a restoring force upon loading between the piston housing and the outer housing.

In addition, the oil seal connecting the piston housing and the outer housing is sealed to prevent the leakage of oil filled in the storage compartment in the outer housing and to prevent the inflow of dust, and the air is discharged when the oil and air sealed in the outer housing are expanded. An air vent is provided so that it can be.

The present invention has the effect of facilitating the processing of the hydraulic automatic tensioner and simplifying the configuration to improve the reliability of the tensioner and to reduce the cost.

1 is a side cross-sectional view of US6106424;

2 is a side sectional view of KR2000-34652;

Figure 3 is a side cross-sectional view of the present invention hydraulic automatic tensioner

Figure 4 is a detailed view of the check valve of the present invention

5 is a cross-sectional plan view of the present invention piston

Figure 6 is a side cross-sectional view of the oil seal of the present invention

Figure 7 is a detailed cross-sectional view of the present invention oil seal coupled to the piston housing

※ Explanation of code for main part of drawing

101. Outer housing 102. Cylinder

103. Return spring 104. Piston

105. Check valve seat 106. Piston housing

107. Oil Seal 108. Storage Room

109. Pivot Bushing 110. Pivot Ring

111. Check valve 113. Check valve cover

114. Check Valve Spring 115. Check Ball

116. Euro 117. Swelling

118,118 '. Groove 119. Fixed End

120. Grid groove 121. With air vent

The piston 104 coupled with the piston housing 106 is inserted into the cylinder 102 press-fitted into the outer housing 101 filled with the hydraulic oil, and a check valve (105) is provided in the check valve seat 105 provided at the lower end of the piston 104. In the hydraulic hydraulic tensioner for an automobile provided with a 111 to tension the belt by the interaction of the operating oil flowing from the check valve 111 and the return spring 103, the check valve provided at the end of the piston (104) The seat 105 is provided with a check valve 111 composed of a check ball 115 supported by a check valve spring 114 embedded in the check valve cover 113, and includes a check valve seat 105 and a piston 104. The hydraulic hydraulic tensioner for an automobile characterized in that the flow path 116 is formed in the best form.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a side cross-sectional view of the present invention hydraulic automatic tensioner, Figure 4 is a detailed view of the check valve of the present invention, Figure 5 is a cross-sectional view of the piston of the present invention, Figure 6 is a side cross-sectional view of the oil seal of the present invention, Figure 7 is Detailed sectional view of the oil seal of the present invention coupled to a piston housing.

As shown in the drawing, the present invention is a cylinder 102 disposed in the outer housing 101 is press-fit or integrated in the outer housing 101, the return spring 103 and the piston 104, the check valve seat 105 It is built in, the piston 104 is integrally coupled with the piston housing 106.

The piston housing 106 and the outer housing are coupled to the oil seal 107 to seal the hydraulic oil storage chamber 108 formed in the outer housing 101.

At the ends of the piston housing 106 and the outer housing 101, a pivot bushing 109 and a pivot ring 110 are provided to be bolted to the tension pulley (not shown) and the engine body (not shown). Consists of.

The cylinder 102 embedded in the outer housing 101 is press-fitted into the outer housing 101 in a sealed bottom surface and open at the top thereof, and includes a check valve seat having a check valve 111 in the cylinder 102. 105 is inserted and engaged with piston 104.

The check valve 111 is coupled by the check valve cover 113 at the bottom of the check valve seat 105, the check valve cover 113 and the check valve spring 114 and the check ball 115 is built-in check ball It is configured to open and close the flow path formed in the check valve seat 105 by 115.

The piston 104 and the cylinder 102 are fixed to the check valve seat ring 124 so as not to be separated after engagement.

The flow path of the check valve 111 is formed in the check valve seat 105 and the piston 104 coupled to the check valve seat 105.

The flow path 116 is formed in the longitudinal direction of the piston 104 in the center of the check valve seat 105, the portion where the check ball 115 is in contact with the piston 104 is formed so that the oil flows.

A return spring 103 is inserted between the outer side of the piston 104 and the cylinder 102 and the outer housing 101 so that the outer housing 101 and the piston housing 106 exert a tension force at a constant pressure. Make sure the tension is generated in the pulley.

A storage chamber 108 in which oil is stored is formed in an inner space of the outer housing 101 into which the return spring 103 is inserted.

The oil stored in the storage compartment 108 flows between the interior of the cylinder 102 and the storage compartment 108 through the check valve 111.

An oil seal 107 is provided between the piston housing 106 and the outer housing 101 to prevent leakage of oil stored in the storage compartment 108 and to prevent intrusion of foreign substances such as dust.

The oil seal 107 has a bulge 117 formed at the bottom thereof is coupled to the groove 118 formed at the outer circumference of the outer housing 101, and the end of the top bulge is formed at the groove 118 ′ formed in the piston housing 106. 117 and the fixed end 119 is inserted.

The oil in the reservoir 108 is easily elevated in temperature due to friction caused by the reciprocating motion of the piston 104, and the increase in temperature of the oil expands the air in the reservoir 108 to inflate the oil seal 107.

Therefore, the air that is expanded in the storage compartment 107 needs to be discharged to the outside of the storage compartment 108.

Since oil is also discharged during air discharge, it is necessary to separate oil and air from the air discharge passage so that only air is discharged and oil discharge is suppressed.

In the present invention, the oil seal 107 is coupled to the oil seal 107 and the outer housing 101 so that the oil seal 107 is expanded by the air expansion of the storage compartment 108 so that oil does not leak between the piston and the

outer housing

106 and 101. The lower end of the) thicker than the other parts of the oil seal 107, and the inner and outer surfaces to make the inner wrinkles to increase the close contact with the outer housing 101 by the folds and configured to easily increase the length when inflated do.

In addition, a portion of the oil seal 107 coupled with the upper piston housing 106 forms a grid groove 120 intersecting with each other in the circumferential direction and the axial direction of the piston housing 106 to increase the temperature of the storage compartment 108 and the imposing load. By the displacement of the oil seal 107 according to the movement of the piston housing 106 by the circumferential and axial direction can be easily expanded to increase the fatigue life of the oil seal 107 is configured.

A spiral air vent 121 is formed at a portion of the grating groove 120 in contact with the circumference of the upper piston housing 106, and is coupled to the end groove 122 of the piston housing 106 at the end of the oil seal 107. It is configured to communicate with the air vent groove 123 formed in the fixed end 119 is separated from the air and oil while the high-pressure air that is expanded in the storage compartment 108 and discharged to the outside passes through the air vent 121 Therefore, only low viscosity air can be discharged.

In addition, the fixed end portion 119 formed on the upper portion of the oil seal 107 and inserted into the end groove 122 of the piston housing 106 has an upper swelling of the oil seal 107 even when air and oil in the storage compartment 108 expand. The gap between the outlet 117 and the piston housing 106 prevents oil or air from leaking.

The operation of the present invention will be described below.

In the present invention, the hydraulic automatic tensioner has a large gap between the piston housing 106 and the outer housing 101 by the built-in return spring 103, and in this case, a negative pressure acts inside the cylinder 102, so that the check valve 111 is fixed. The oil in the storage compartment 108 flows into the cylinder 102 as is opened.

When the compression force by the belt acts on the piston housing 106, the pressure in the cylinder 102 increases and the check valve 111 is closed and the oil in the cylinder 102 is separated between the check valve seat 105 and the cylinder 102. It slowly returns through the gap and returns to the storage compartment 108.

As the vibration exerted by the belt is absorbed by the oil leaking into the gap between the check valve seat 105 and the cylinder 102, the hydraulic automatic tensioner imparts a constant tension to the belt by the elasticity of the return spring 103.

At this time, since the friction between the check belt seat 105 and the cylinder 102 continues to occur, the temperature of the oil increases as time passes, and when the temperature of the oil rises, the oil and air stored in the storage compartment 108 expand and the oil seal 107. ) Is expanded together with the expanded air of the storage compartment 108 is discharged to the air vent groove 123 through the spiral air vent 121.

The present invention can be used as an automatic tension control device for vehicle engine timing belt and engine accessory drive belt.

Claims

The piston 104 coupled with the piston housing 106 is inserted into the cylinder 102 press-fitted into the outer housing 101 filled with the hydraulic oil, and a check valve (105) is provided in the check valve seat 105 provided at the lower end of the piston 104. In the hydraulic hydraulic tensioner for an automobile provided with a 111 to give tension to the belt by the interaction of the hydraulic fluid flowing from the check valve 111 and the return spring 103,

The check valve seat 105 provided at the end of the piston 104 is provided with a check valve 111 composed of a check ball 115 supported by a check valve spring 114 embedded in the check valve cover 113. Check valve seat 105 and the piston 104 is a hydraulic auto-tensioner for automobiles, characterized in that the flow path 116 is formed.
In the hydraulic hydraulic tensioner for an automobile provided with an oil seal 107 between the outer housing 101 and the piston housing 106 filled with the hydraulic oil to prevent the leakage of the hydraulic oil and to prevent the intrusion of foreign substances,

Wrinkles are formed on the inner and outer surfaces of the oil seal 101 on the surface where the oil seal 107 and the outer housing 101 contact, and the circumference of the oil seal 107 on the surface where the piston housing 106 and the oil seal 107 contact The grid groove 120 is formed to cross in the axial direction and the axial direction, and the spiral air vent 121 is formed in the oil seal 107 that is in contact with the circumference of the piston housing 106 in the upper portion of the grid groove 120 Hydraulic auto-tensioner for automobiles, characterized in that configured to communicate with the air vent groove 123 formed on the lower end of the fixed end portion 119 is coupled to the end groove 122 of the piston housing 106.