JP2003343670A - Hydraulic auto tensioner - Google Patents

Hydraulic auto tensioner

Info

Publication number
JP2003343670A
JP2003343670A JP2002156494A JP2002156494A JP2003343670A JP 2003343670 A JP2003343670 A JP 2003343670A JP 2002156494 A JP2002156494 A JP 2002156494A JP 2002156494 A JP2002156494 A JP 2002156494A JP 2003343670 A JP2003343670 A JP 2003343670A
Authority
JP
Japan
Prior art keywords
piston
piston rod
chamber
side
oil passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002156494A
Other languages
Japanese (ja)
Other versions
JP3707447B2 (en
Inventor
Katsushi Tanaka
勝志 田中
Original Assignee
Showa Corp
株式会社ショーワ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Showa Corp, 株式会社ショーワ filed Critical Showa Corp
Priority to JP2002156494A priority Critical patent/JP3707447B2/en
Publication of JP2003343670A publication Critical patent/JP2003343670A/en
Application granted granted Critical
Publication of JP3707447B2 publication Critical patent/JP3707447B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0802Actuators for final output members
    • F16H2007/0806Compression coil springs

Abstract

<P>PROBLEM TO BE SOLVED: To lock a compressing stroke and to compact the entire length in a hydraulic auto tensioner. <P>SOLUTION: In the hydraulic auto tensioner 10: a piston rod side chamber 15A and a piston side oil chamber 15B are partitioned in an inner cylinder 12; an oil sump chamber 16 that communicates with the piston rod side chamber 15A and comprises a gas chamber 16A and an oil chamber 16B is disposed between an outer cylinder 11 and the inner cylinder 12; a pressure side damping oil passage 31 for communicating the piston side oil chamber 15B with the piston rod side chamber 15A is disposed in a piston 13 or a piston rod 14; an expansion side oil passage 42 for communicating the oil sump chamber 16 with the piston side oil chamber 15B is disposed; a first check valve 32 to be closed in an expansion time is disposed in the pressure side damping oil passage 31; a second check valve 43 to be closed in a compression time is disposed in the expansion side oil passage 42; and a valve operating member 37 for closing the first check valve 32 is disposed in the piston rod 14. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic autotensioner for applying tension to a belt or a chain stretched between driving wheels and driven wheels.

[0002]

2. Description of the Related Art A hydraulic autotensioner applies a tension to a belt or a chain (hereinafter referred to as a belt). Therefore, when the tension of the belt rapidly increases and the piston rod is about to be compressed, a damping force for the compression is generated. Let
When the tension of the belt is suddenly reduced and the piston rod is about to extend, the extension is accelerated.

By the way, there is a hybrid vehicle in which two drive sources, which are an engine and an electric motor, are wound around one belt and the drive sources are switched appropriately. In some of such hybrid vehicles, a hydraulic autotensioner for adjusting the tension of the belt is arranged at a position on the downstream side of the engine and on the upstream side of the electric motor. However, when the engine is started by the electric motor while the engine is stopped, the auto tensioner compresses and slips on the belt. Therefore, it is necessary to lock the compression stroke of the hydraulic auto tensioner in order to keep the belt from slipping.

[0004]

In the hydraulic autotensioner of Patent 2537547, a damping force on the pressure side is generated by causing the working oil to flow in the clearance passage between the piston portion 13 of the piston rod 8 and the inner circumference of the cylinder 14. Therefore, the gap flow path cannot be closed. Therefore, it is difficult to provide a compression stroke locking mechanism.

The hydraulic autotensioner of Japanese Patent Laid-Open No. 1-106924 has the following problems although it has a compression stroke locking mechanism. That is, also in the embodiments of FIGS. 1 to 3, since the piston rod compensation chamber (gas chamber) 13 is provided in series with the working chamber 12, the total length of the hydraulic autotensioner becomes longer in the axial direction, and the narrow engine is used. Installation in the room becomes difficult. Further, in the embodiment of FIG. 2, since the compensation chamber 13 is provided in the pressure pipe 11 in series with the working chamber 12, the shock absorber 26 (provided on the lower end face of the piston during extension operation of the piston rod) The plate valve) is opened, and the gas in the compensation chamber 13 directly flows into the working chamber 1 below the piston 18.
It is easy to get caught in 2. As a result, when the valve operating member 22 closes the overflow opening 25 when the compression stroke is locked,
The bubbles in the working chamber 12 may be crushed and the piston may drop, which may cause a phenomenon that the compression stroke is not locked.

An object of the present invention is to lock the compression stroke and make the overall length compact in a hydraulic autotensioner.

[0007]

According to a first aspect of the present invention, in a hydraulic type automatic tensioner for applying tension to a belt or a chain stretched between a driving wheel and a driven wheel, an inner cylinder is provided inside an outer cylinder. From the opening of the inner cylinder, insert a piston rod with a piston that slides inside the inner cylinder attached to the tip end,
A chamber on the piston rod side that accommodates the piston rod and an oil chamber on the piston side that does not accommodate the piston rod are defined in the inner cylinder, and between the outer cylinder and the inner cylinder, the chamber on the piston rod side and An oil reservoir chamber including a gas chamber and an oil chamber is provided in communication with the piston or the piston rod, and a pressure side damping oil passage that connects the piston side oil chamber and the piston rod side chamber is provided. An expansion-side oil passage that connects the reservoir chamber and the piston-side oil chamber is provided, a first check valve that is closed during expansion is provided in the compression-side damping oil passage, and a second check valve that is closed during compression is provided in the expansion-side oil passage. A check valve is provided, and a valve operating member for closing the first check valve is provided in the piston rod.

According to a second aspect of the present invention, in addition to the first aspect of the invention, the first check valve is a ball valve, and the valve operating member is a push rod provided adjacent to the ball valve. A solenoid that presses the ball valve via the push rod and closes the compression side damping oil passage at the time of energization is provided at the base end portion of the piston rod.

According to a third aspect of the invention, in addition to the first or second aspect of the invention, an inclined oil passage is converged on the lower end surface of the piston from the outer peripheral edge portion of the lower end surface toward the compression side damping oil passage. Alternatively, an inclined surface is provided so that bubbles in the oil chamber on the piston side can escape.

According to a fourth aspect of the present invention, in addition to the invention according to any one of the first to third aspects, an orifice member having the compression side damping oil passage is replaceably provided in the piston or the piston rod.

According to a fifth aspect of the present invention, in addition to any one of the first to fourth aspects, the first check valve is a ball valve, and the ball valve is an elastic member at the opening of the compression side damping oil passage. It was urged.

According to a sixth aspect of the present invention, in addition to the fifth aspect of the present invention, a recess for restricting lateral movement of the ball valve is provided in the opening of the compression side damping oil passage, and the ball valve is provided in the recess. It has been packaged.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing a hydraulic type autotensioner of a first embodiment, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a schematic view showing a rod guide, and FIG. 4 is a piston rod. 5 is a schematic diagram showing a piston, FIG. 6 is a schematic diagram showing an orifice member, FIG. 7 is a schematic diagram showing an elastic member, FIG. 8 is a schematic diagram showing a push rod, and FIG. 9 is a bottom piece. 10 is a schematic view showing the hydraulic autotensioner of the second embodiment, FIG. 11 is a schematic view showing a piston rod assembly, and FIG. 12 is a schematic view showing an operating state of a valve operating member.

(First Embodiment) (FIGS. 1 to 9) The hydraulic automatic tensioner 10 is, for example, in a hybrid vehicle, by pressing an idler pulley against a belt stretched between driving wheels and driven wheels. Tension is applied to the belt.

As shown in FIGS. 1 and 2, the automatic tensioner 10 is provided with an inner cylinder 12 inside an outer cylinder 11, and a piston 13 sliding in the inner cylinder 12 from the opening of the inner cylinder 12 at the tip. The piston rod side chamber 15 which inserts the attached piston rod 14 and accommodates the piston rod 14 in the inner cylinder 12
A and a piston side oil chamber 15B that does not house the piston rod 14 are defined, and the piston rod side chamber 15A is communicated between the outer cylinder 11 and the inner cylinder 12, and the gas chamber 16A and the oil chamber 16B are connected.
Is provided with an oil storage chamber 16.

In the auto tensioner 10, the rod guide 1 is inserted into the opening of the outer cylinder 11 with the inner cylinder 12 fitted with a bottom piece 41, which will be described later, seated inside the outer cylinder 11.
7. The seal member 18 is inserted, and the rod guide 17 and the seal member 18 are sandwiched between the cap 19 screwed into the opening of the outer cylinder 11 and the end surface of the inner cylinder 12.

As shown in FIG. 3, the rod guide 17 has an outer peripheral portion 17A fitted to the outer cylinder 11, an annular recess 17B fitted to the inner cylinder 12, and an inner peripheral portion 17C slidably supporting the piston rod 14. An oil passage 17D is formed by cutting out at a plurality of circumferential positions (four positions) of the outer peripheral portion 17A so as to connect the piston rod 14 side chamber 15A and the oil reservoir chamber 16 to each other.

The seal member 18 is made of an oil seal, is arranged outside the rod guide 17, and seals the piston rod 14 side chamber 15A and the oil reservoir chamber 16.

The autotensioner 10 is provided with one end mounting portion 21 on the outer cylinder 11 side and another end mounting portion 22 on the piston rod 14 side. The mounting member 24 is fixed to the base end portion of the piston rod 14 protruding from the inner cylinder 12 with a lock nut 23, and the mounting housing 25 screwed to the mounting member 24 is provided with the above-mentioned other end mounting portion 22.

In the auto tensioner 10, a spring receiver 26 is formed on the outer circumference of the outer cylinder 11, and a spring receiver 27 is formed on the outer circumference of the mounting member 24 on the piston rod 14 side.
A coil spring 28 for urging the piston rod 14 in the extending direction is provided between the spring receiver 26 and the spring receiver 27.
Is intervening. Further, a cylindrical protective cover 29 is provided on the outer circumference of the coil spring 28, and an annular mounting portion 29A provided at the end of the protective cover 29 is held between the spring receiver 27 and the coil spring 28 with a pressing force.

The automatic tensioner 10 includes a piston 13
The piston rod 14 is provided with a compression side damping force generating device 30. That is, the piston 13 is provided with the pressure side damping oil passage 31 that communicates the piston side oil chamber 15B and the piston rod side chamber 15A, and the pressure side damping oil passage 31 is provided with the first check valve 32 that is closed when the piston rod 14 is compressed. . That is, the piston 13 has a threaded portion 14A at the tip of the piston rod 14.
An orifice member 33, which is screwed to (FIG. 4) and is exchangeably loaded in the recess of the piston 13, is held by the tip end surface of the piston rod 14, and the opening of the compression side damping oil passage 31 formed in the orifice member 33 is A check valve 32 of 1 is provided. In this embodiment, the first check valve 32 is a ball valve 32A.

As shown in FIG. 5, the piston 13 includes an oil passage 13A for communicating the pressure side damping oil passage 31 of the orifice member 33 with the piston rod side chamber 15A and a piston side oil chamber 15B.
Is provided with an oil passage 13B communicating with the compression side damping oil passage 31 of the orifice member 33. O on the outer circumference of the lower end of the piston 13
The ring 34 and the piston ring 35 are attached, and the outer periphery on the upper end side has a small outer diameter portion that opens the oil passage 13A to the piston rod side chamber 15A. The oil passage 13B provided at the lower end surface of the piston 13 is composed of a plurality of radial oil passages, and has an inclined shape that converges from the annular groove 13C provided at the lower end surface toward the compression side damping oil passage 31 of the orifice member 33. And functions to collect air bubbles in the piston side oil chamber 15B and escape them to the piston rod side chamber 15A side.

The orifice member 33, as shown in FIG.
Recessed portion 3 with a tapered guide at the opening of the compression side damping oil passage 31
3A is provided, and the first check valve 32 (ball valve 32
(A) is housed in the recess 33A to regulate the lateral movement of the ball valve 32A. The orifice member 33 includes a cutout groove 33B that connects the compression side damping oil passage 31 to the oil passage 13A of the piston 13.

The first check valve 32 (ball bubble 32
A) is urged by the elastic member 36 so as to seal the opening of the compression side damping oil passage 31. As shown in FIG. 7, the elastic member 36 is composed of, for example, a conical coil spring, its large diameter end is back-supported by a spring receiver 14B provided on the tip surface of the piston rod 14, and its small diameter end is a ball valve 32A.
Abut.

The automatic tensioner 10 includes a first check valve 32 (ball valve 32) inside the piston rod 14.
A valve operating member 37 for closing A) is provided. Valve operating member 37
Is provided adjacent to the first check valve 32 (ball valve 32A) as shown in FIG.
It consists of 7A. The auto tensioner 10 has a solenoid 38 built in a mounting member 24 and a mounting housing 25 provided at the base end of the piston rod 14. When energized, the solenoid 38 presses the first check valve 32 (ball valve 32A) via the push rod 37A by the pressing element 38A, and closes the compression side damping oil passage 31 of the orifice member 33.

An end cap 39 is press-fitted into the base end portion of the piston rod 14 into which the push rod 37A is inserted, and the O-ring 39 with which the push rod 37A is slidably contacted.
Equipped with A. With the solenoid 38 de-energized, the oil in the piston-side oil chamber 15B remains in the first check valve 32.
Push (ball valve 32A) open and push rod 3
When 7A is lifted to the raised position, the push rod 37A can be held at the raised position by the frictional force of the O-ring 39A.

The automatic tensioner 10 includes a bottom piece 41 fitted to the inner cylinder 12, and an oil chamber 15B on the piston 13 side.
The extension side oil passage 42 (annular oil passage 42
Second, which is provided with A) and is closed when the piston rod 14 is compressed
The check valve 43 is provided in the extension side oil passage 42. The second check valve 43 is composed of an annular plate valve 43A, and a disc spring 45 backed up by a retaining ring 44 attached to the inner circumference of the inner cylinder 12 can apply a closing direction force to the plate valve 43A.

The auto tensioner 10 operates as follows. (1) The auto tensioner 10 presses the idler pulley against the belt by the biasing force of the coil spring 28 to apply a predetermined tension to the belt.

(2) When the tension of the belt is suddenly reduced and the piston rod 14 is about to extend due to the coil spring 28, the piston side oil chamber 15B becomes a negative pressure, but the second check valve 43 (plate valve 43A ) Is immediately opened, and the oil in the oil reservoir 16 is quickly supplied to the piston side oil chamber 15B.

(3) When the tension of the belt suddenly increases and the piston rod 14 is about to be compressed by the belt,
The second check valve 43 (plate valve 43A) is closed and the piston side oil chamber 15B becomes high pressure. The high-pressure oil in the piston-side oil chamber 15B is supplied to the first check valve 32 in the pressure-side damping oil passage 31 of the orifice member 33 provided in the piston 13.
(Ball valve 32A) is pushed open and the compression side damping oil passage 3
1 to the piston rod side chamber 15A, and by extension the oil sump chamber 16
Flow slowly to this, which produces a damping force on the compression side.

In the automatic tensioner 10, in order to prevent the belt from slipping, the piston rod 14
When it is necessary to lock the compression stroke of No. 3, the solenoid 38 is energized to operate the valve operating member 37 (push rod 37A) to stop the opening of the first check valve 32 (ball valve 32A) described in (3) above. . As a result, both the second check valve 43 (plate valve 43A) and the first check valve 32 (ball valve 32A) are closed,
The oil in the piston side oil chamber 15B is trapped and locks the compression stroke of the piston rod 14.

According to this embodiment, there are the following effects. (Operation corresponding to claim 1) The compression side damping oil passage 31 is provided in the piston 13 (or the piston rod 14) that defines the chambers 15A and 15B on both sides of the piston 13, and the first damping oil passage 31 is provided with the compression side damping oil passage 31. The valve operating member 37 for closing the check valve 32 is connected to the piston rod 1
It was installed in 4. Therefore, the compression stroke of the automatic tensioner 10 can be locked, and the slippage of the belt due to the change in the tension of the belt can be suppressed.

When the piston rod 14 is extended,
Since the first check valve 32 of the piston 13 is closed, the air mixed in the piston rod side chamber 15A does not enter the piston side oil chamber 15B. Further, the working oil in the oil reservoir 16 between the outer cylinder 11 and the inner cylinder 12 is not agitated by the operation of the piston 13, so that air is less mixed. Therefore, when the second check valve 43 provided at the bottom of the oil sump chamber 16 is opened, the piston side oil chamber 15B in the inner cylinder 12 is opened.
Less air is mixed in. Therefore, the piston rod 14
When the compression stroke is locked, the piston 13 is not lowered and the compression stroke can be reliably locked.

A unidirectional flow of the hydraulic fluid from the piston side oil chamber 15B to the piston side oil chamber 15B through the piston rod side chamber 15A and the oil reservoir chamber 16 regardless of whether the piston rod 14 is compressed or extended. become. This allows
The hydraulic oil is not agitated, and air is rarely mixed in the hydraulic oil. Therefore, when the compression stroke of the piston rod 14 is locked, the piston 13 is not lowered, and the compression stroke can be reliably locked.

Compensation chamber for piston rod 14 (oil reservoir chamber 1
Since 6) is provided between the outer cylinder 11 and the inner cylinder 12, the working chamber (the chambers 15A and 15B on both sides of the piston 13) and the compensation chamber 1
6 are arranged side by side, and the total length of the auto tensioner 10 does not increase in the axial direction.

(Operation corresponding to claim 2) Since the ball valve 32A is used as the first check valve 32, it is possible to ensure the sealing. Further, since the ball valve 32A is pressed by the push rod 37A driven by the solenoid 38, the structure for locking the compression stroke of the piston rod 14 can be simplified.

(Operation corresponding to claim 3) Since the inclined oil passage (or conical inclined concave surface) 13B is provided on the lower end surface of the piston 13 facing the piston side oil chamber 15B, the bubbles in the piston side oil chamber 15B are removed. Easy to pull out. Therefore,
When the compression stroke of the piston rod 14 is locked, the piston 13 is not lowered, and the compression stroke can be reliably locked.

(Operation corresponding to claim 4) Since the orifice member 33 in which the compression side damping oil passage 31 is formed is provided in the piston 13 (or piston rod 14) in a replaceable manner, it is easy to set and change the compression side damping force. Become.

(Operation corresponding to claim 5) The elastic member (coil spring) 36 allows the ball valve 32A constituting the first check valve 32 to be always positioned at the opening of the compression side damping oil passage 31. , The piston rod side chamber 15 when the piston rod 14 is extended.
The air mixed in A is prevented from entering the piston side oil chamber 15B.

(Operation corresponding to claim 6) The ball valve 32A is installed in the recess 33 of the orifice member 33.
Since the ball valve 32A is housed in A, the ball valve 32A is centered in the axial direction of the compression side damping oil passage 31 and is free to move in the axial direction without losing the check function.

(Second Embodiment) (FIGS. 10 to 12) The hydraulic automatic tensioner 10A of the second embodiment is the first.
The difference from the hydraulic autotensioner 10 of the embodiment is the structure of the compression side damping force generator 30 provided on the piston 13 and the piston rod 14. The piston 13 is crimped and held on the outer periphery of the tip of the piston rod 14.

As shown in FIGS. 10 and 11, the compression side damping force generating device 30 of the automatic tensioner 10A is provided with a compression side damping oil passage 51 on the piston rod 14, and the compression side damping oil passage 5 is provided.
1 is provided with a first check valve 32 (ball valve 32A). That is, the orifice member 52 is caulked and held in the stepped hole formed in the tip end surface of the piston rod 14, and the first side is formed in the opening of the compression side damping oil passage 51 formed in the orifice member 52.
Check valve 32 is provided. First check valve 32
The ball valve 32A can be seated on a tapered seat 52A provided at the opening of the compression side damping oil passage 51.

The piston rod 14 is the piston side oil chamber 1
5B, which opens the compression side damping oil passage 51 and connects the compression side damping oil passage 51 to the piston rod side chamber 15A.
3 is provided.

The automatic tensioner 10A also includes a valve operating member 37 (push rod 37A) and a solenoid 38 similar to those of the automatic tensioner 10. When the piston rod 14 is compressed while the solenoid 38 is not energized, the first check valve 32 (ball valve 32A)
Is pushed open by the oil in the piston side oil chamber 15B (Fig. 1
2 (A)). On the other hand, when the solenoid 38 is energized, the first
Check valve 32 (ball valve 32A) is pressed by the valve operating member 37 (push rod 37A) to close the compression side damping oil passage 51 of the orifice member 52 (FIG. 12).
(B)).

Even in the automatic tensioner 10A, like the automatic tensioner 10, the compression stroke of the piston rod 14 can be locked and the overall length can be made compact.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the gist of the present invention. Etc. are included in the present invention.

[0047]

As described above, according to the present invention, in the hydraulic automatic tensioner, the compression stroke can be locked and the overall length can be made compact.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a hydraulic auto tensioner of a first embodiment.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a schematic view showing a rod guide.

FIG. 4 is a schematic view showing a piston rod.

FIG. 5 is a schematic diagram showing a piston.

FIG. 6 is a schematic view showing an orifice member.

FIG. 7 is a schematic view showing an elastic member.

FIG. 8 is a schematic view showing a push rod.

FIG. 9 is a schematic view showing a bottom piece.

FIG. 10 is a cross-sectional view showing a hydraulic auto tensioner of a second embodiment.

FIG. 11 is a schematic view showing a piston rod assembly.

FIG. 12 is a schematic diagram showing an operating state of a valve operating member.

[Explanation of symbols] 10, 10A hydraulic auto tensioner 11 outer cylinder 12 inner cylinder 13 pistons 14 Piston rod 15A Piston rod side chamber 15B Piston side oil chamber 16 oil reservoir 16A gas chamber 16B oil chamber 30 Pressure side damping force generator 31, 51 Pressure side damping oil passage 32 First check valve 32A ball valve 33,52 Orifice member 36 Elastic member 37 Valve operating member 37A bush rod 38 Solenoid 42 Extension side oil passage 43 Second check valve

Claims (6)

[Claims]
1. A hydraulic autotensioner for applying tension to a belt or a chain stretched between a driving wheel and a driven wheel, wherein an inner cylinder is provided in an outer cylinder, and the inner cylinder is opened from an opening of the inner cylinder. A piston rod having a piston that slides inside is attached to the tip end is inserted, and a chamber on the piston rod side that accommodates the piston rod and an oil chamber on the piston side that does not accommodate the piston rod are defined in the inner cylinder. Between the outer cylinder and the inner cylinder, an oil storage chamber that is in communication with the chamber on the piston rod side and includes a gas chamber and an oil chamber is provided, and in the piston or the piston rod, an oil chamber on the piston side and A compression-side damping oil passage that communicates with the piston rod-side chamber is provided, an extension-side oil passage that communicates with the oil reservoir chamber and the piston-side oil chamber is provided, and the compression-side damping oil passage is closed at the time of extension. Check valve provided, The side oil passage, the second check valve to close at the time of compression provided in the piston rod, hydraulic auto-tensioner which is characterized in that a first check valve to close the valve operating member.
2. The first check valve comprises a ball valve, the valve operating member comprises a push rod provided adjacent to the ball valve, and the push end is provided at a base end portion of the piston rod when energized. The hydraulic auto tensioner according to claim 1, further comprising a solenoid that presses the ball valve via a rod and closes the compression side damping oil passage.
3. An inclined oil passage or an inclined surface that converges from an outer peripheral edge portion of the lower end surface toward the compression side damping oil passage is provided on the lower end surface of the piston to prevent bubbles in the piston side oil chamber. The hydraulic auto tensioner according to claim 1 or 2, wherein the hydraulic auto tensioner is released.
4. The hydraulic automatic tensioner according to claim 1, wherein an orifice member having the compression side damping oil passage is provided in the piston or the piston rod in a replaceable manner.
5. The hydraulic system according to claim 1, wherein the first check valve is a ball valve, and the ball valve is biased to an opening of the compression side damping oil passage by an elastic member. Auto tensioner.
6. The hydraulic autotensioner according to claim 5, wherein a recess for restricting lateral movement of the ball valve is provided at an opening of the compression side damping oil passage, and the ball valve is housed in the recess. .
JP2002156494A 2002-05-29 2002-05-29 Hydraulic auto tensioner Expired - Fee Related JP3707447B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002156494A JP3707447B2 (en) 2002-05-29 2002-05-29 Hydraulic auto tensioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002156494A JP3707447B2 (en) 2002-05-29 2002-05-29 Hydraulic auto tensioner

Publications (2)

Publication Number Publication Date
JP2003343670A true JP2003343670A (en) 2003-12-03
JP3707447B2 JP3707447B2 (en) 2005-10-19

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006258269A (en) * 2005-03-18 2006-09-28 Showa Corp Hydraulic tensioner
JP2006258268A (en) * 2005-03-18 2006-09-28 Showa Corp Damping force generating structure for hydraulic tensioner
EP1710472A1 (en) * 2004-01-27 2006-10-11 Ntn Corporation Auto-tensioner for accessories
EP2101082A3 (en) * 2008-03-13 2009-10-14 Ntn Corporation Hydraulic auto-tensioner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104235293A (en) * 2014-09-11 2014-12-24 绵阳富临精工机械股份有限公司 Engine accessory belt hydraulic tensioner

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1710472A1 (en) * 2004-01-27 2006-10-11 Ntn Corporation Auto-tensioner for accessories
EP1710472A4 (en) * 2004-01-27 2010-04-21 Ntn Toyo Bearing Co Ltd Auto-tensioner for accessories
JP2006258269A (en) * 2005-03-18 2006-09-28 Showa Corp Hydraulic tensioner
JP2006258268A (en) * 2005-03-18 2006-09-28 Showa Corp Damping force generating structure for hydraulic tensioner
EP2101082A3 (en) * 2008-03-13 2009-10-14 Ntn Corporation Hydraulic auto-tensioner

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