JPH0510849U - Hydraulic auto tensioner - Google Patents

Hydraulic auto tensioner

Info

Publication number
JPH0510849U
JPH0510849U JP5875191U JP5875191U JPH0510849U JP H0510849 U JPH0510849 U JP H0510849U JP 5875191 U JP5875191 U JP 5875191U JP 5875191 U JP5875191 U JP 5875191U JP H0510849 U JPH0510849 U JP H0510849U
Authority
JP
Japan
Prior art keywords
spring
cylinder
return spring
piston
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.)
Pending
Application number
JP5875191U
Other languages
Japanese (ja)
Inventor
久 早川
Original Assignee
エヌテイエヌ株式会社
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 エヌテイエヌ株式会社 filed Critical エヌテイエヌ株式会社
Priority to JP5875191U priority Critical patent/JPH0510849U/en
Publication of JPH0510849U publication Critical patent/JPH0510849U/en
Pending legal-status Critical Current

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
    • F16H7/0848Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
    • F16H2007/0859Check valves

Abstract

(57) [Summary] [Purpose] To increase the spring force of the return spring for tension adjustment without increasing the cylinder length or spring constant. [Composition] Return spring 12 is provided outside cylinder 1.
The spring force of the spring 12 is
To the piston rod 9 via. Since the cylinder 1 and the return spring 12 overlap each other in the length direction, only the total length of the spring can be set large.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic auto tensioner used for adjusting tension of an engine timing belt or the like.

[0002]

[Prior Art]

 Conventionally, as a hydraulic autotensioner that realizes a lightweight cylinder, as shown in Fig. 3, a separate sleeve 2'is provided inside a cylinder 1'made of a light alloy, and inside the sleeve 2 '. It has been proposed that the piston 3 is slidably inserted.

In this structure, the hydraulic oil chamber 4 inside the cylinder 1 ′ is divided into a pressure chamber 5 and a reservoir chamber 6 by the piston 3, and the piston 3 is provided with a passage 7 that connects the pressure chamber 5 and the reservoir chamber 6 to each other. A check valve 8 for opening and closing the passage 7 is provided at the outlet of the passage.

Further, a piston rod 9 is connected to the piston 3, and a step portion 10 formed on the piston rod 9 is engaged with a bearing 11 that slides on the inner peripheral surface of the cylinder 1 ′ and its bearing 11 and A return spring 12 'is incorporated between the sleeve 2'and the upper end of the sleeve 2'to apply a spring force to the piston 3 and the piston rod 9 in the outward projecting direction.

In the figure, 13 is a retainer, 14 is a coupling spring for connecting the piston 3 and the piston rod 9, 15 is an oil seal, 16 is a tension pulley, 17 is a supporting arm thereof, 18 is a supporting shaft, and 19 is a tension adjusting device. Belt for.

[0006]

[Problems to be solved by the device]

 In the hydraulic autotensioner having the above structure, the belt tension is adjusted by changing the spring force of the return spring 12 ', but in order to increase the spring force of the return spring 12', the spring 12 'is increased. It is necessary to either increase the total length of the spring or increase the spring constant.

However, in the conventional auto tensioner shown in FIG. 3, since the return spring 12 ′ is incorporated between the sleeve 2 ′ and the bearing 11, when the total length of the return spring 12 ′ is increased, the cylinder 1 There is a problem that the total length of the 'is too large and it becomes difficult to attach it to the engine.

On the other hand, when the spring constant of the return spring 12 ′ is increased in order to suppress the increase in the cylinder length, it is difficult to keep the spring force of the entire return spring within a predetermined range, and the required belt is required. There is a problem that it is difficult to match the spring force with the tension of the.

Therefore, the present invention intends to provide a structure in which the spring force of the return spring can be set large without increasing the cylinder length or changing the spring constant.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, this invention is one in which a return spring is fitted to the outside of the cylinder.

[0011]

[Action]

 In the above structure, since the cylinder and the return spring overlap each other in the length direction, only the total length of the spring can be increased without increasing the cylinder length.

Further, since the spring length can be increased, the spring force can be set large without changing the spring constant.

[0013]

Embodiment FIG. 1 shows a hydraulic type automatic tensioner of an embodiment. The basic structure of this autotensioner is the same as that of the conventional one shown in FIG. 2, so the same parts are designated by the same reference numerals and the description thereof is omitted.

The difference of this embodiment from the conventional one is that the return spring 12 is fitted on the outer side of the outer peripheral surface of the cylinder 1.

That is, the return spring 12 is formed by a coil spring wound around the outer peripheral surface of the cylinder 1 with a gap, and one end of the return spring 12 is engaged with a flange 20 provided on the outer peripheral bottom of the cylinder 1.

A spring seat 21 that extends outward from the outer circumference of the cylinder 1 is attached to the peripheral surface of the piston rod 9, and the other end of the return spring 12 is engaged with the spring seat 21. A spring force is always applied to the rod 9 so as to project outward.

In the above structure, since the cylinder 1 and the return spring 12 overlap each other in the length direction, the total length of the return spring 12 can be increased without increasing the cylinder length, and a large spring force can be set. can do.

Further, since the total length of the return spring 12 can be increased, the spring force of the entire spring can be set large without changing the spring constant or in a state where the spring constant is decreased. Therefore, the spring force of the spring can be accurately matched to the required belt tension.

Further, since the return spring 12 is provided outside the cylinder 1, the inner diameter of the cylinder 1 and the volume of the hydraulic oil chamber 4 can be made the same as those of the conventional structure shown in FIG. Therefore, the amount of hydraulic oil is not increased, and the parts such as the sleeve 2, the piston 3, and the bearing 11 can be shared with the conventional parts.

In the automatic tensioner having the above structure, when the tension of the belt 19 increases, the tension pulley 16 swings and the pressing force acting on the piston rod 9 increases. As a result, when the piston 3 is pushed in, the hydraulic oil in the pressure chamber 5 leaks from the gap between the piston 3 and the cylinder 1 into the reservoir chamber 6 and buffers the movement of the piston 3. Therefore, the tension pulley 16 swings slowly to cope with the increase in belt tension.

On the contrary, when the tension of the belt 19 decreases, the piston rod 9 projects outward due to the spring force of the return spring 12, and when the piston 3 moves up following this movement, the pressure in the pressure chamber 5 increases. And the check valve 8 opens the passage 7. Therefore, the hydraulic oil in the reservoir chamber 6 moves to the pressure chamber 5 through the passage 7, and the piston rod 9 rapidly projects to swing the tension pulley 16 in accordance with the movement of the belt. At this time, the piston 3 stops at the balance point between the pressing force acting on the piston rod 9 and the spring force of the return spring 12.

Although the sleeve 2 is provided inside the cylinder 1 in the above embodiment, the sleeve 2 may be omitted and the piston 3 may be slid directly on the inner peripheral surface of the cylinder.

[0023]

【effect】

 As described above, according to the present invention, the return spring is fitted on the outside of the cylinder, and the both are overlapped in the length direction. Therefore, it is possible to increase only the entire length of the return spring without increasing the cylinder length. The compact shape can increase the spring force.

Further, since the total length of the return spring can be increased, the spring force can be set large without changing the spring constant or with a small spring constant, and the spring force of the spring can be adjusted accurately. There is an advantage.

Further, since it is not necessary to increase the inner diameter of the cylinder, the volume of the hydraulic oil chamber does not increase, and in addition, since the internal parts such as the piston can be shared with the conventional structure, the manufacturing cost can be reduced. is there.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Cylinder 2 Sleeve 3 Piston 4 Hydraulic Oil Chamber 9 Piston Rod 12 Return Spring 20 Flange 21 Spring Seat

Claims (1)

  1. [Claims for utility model registration] [Claim 1] A hydraulic fluid chamber in the cylinder is divided into a pressure chamber and a reservoir chamber by a piston slidably inserted into the cylinder, and the pressure chamber and the reservoir are provided in the piston. A check valve that forms a passage that connects the chambers and closes the passage when the hydraulic oil pressure on the pressure chamber side increases from the reservoir chamber is provided in the passage. A hydraulic autotensioner in which a return spring that applies a spring force in a protruding direction is connected, wherein the return spring is fitted to the outside of a cylinder.
JP5875191U 1991-07-25 1991-07-25 Hydraulic auto tensioner Pending JPH0510849U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5875191U JPH0510849U (en) 1991-07-25 1991-07-25 Hydraulic auto tensioner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5875191U JPH0510849U (en) 1991-07-25 1991-07-25 Hydraulic auto tensioner
JP20171498A JPH11148540A (en) 1991-07-25 1998-07-16 Hydraulic automatic tensioner

Publications (1)

Publication Number Publication Date
JPH0510849U true JPH0510849U (en) 1993-02-12

Family

ID=13093247

Family Applications (2)

Application Number Title Priority Date Filing Date
JP5875191U Pending JPH0510849U (en) 1991-07-25 1991-07-25 Hydraulic auto tensioner
JP20171498A Pending JPH11148540A (en) 1991-07-25 1998-07-16 Hydraulic automatic tensioner

Family Applications After (1)

Application Number Title Priority Date Filing Date
JP20171498A Pending JPH11148540A (en) 1991-07-25 1998-07-16 Hydraulic automatic tensioner

Country Status (1)

Country Link
JP (2) JPH0510849U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005071288A1 (en) 2004-01-27 2005-08-04 Ntn Corporation Auto-tensioner for accessories
KR101326336B1 (en) * 2012-11-23 2013-11-11 지엠비코리아 주식회사 Hydraulic type auto-tensioner
DE102005027597B4 (en) * 2005-06-15 2016-10-13 Schaeffler Technologies AG & Co. KG Hydraulic tensioning element

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005071288A1 (en) 2004-01-27 2005-08-04 Ntn Corporation Auto-tensioner for accessories
EP1710472A1 (en) * 2004-01-27 2006-10-11 Ntn Corporation Auto-tensioner for accessories
CN100441913C (en) * 2004-01-27 2008-12-10 Ntn株式会社 Auto-tensioner for accessories
EP1710472A4 (en) * 2004-01-27 2010-04-21 Ntn Toyo Bearing Co Ltd Auto-tensioner for accessories
DE102005027597B4 (en) * 2005-06-15 2016-10-13 Schaeffler Technologies AG & Co. KG Hydraulic tensioning element
KR101326336B1 (en) * 2012-11-23 2013-11-11 지엠비코리아 주식회사 Hydraulic type auto-tensioner

Also Published As

Publication number Publication date
JPH11148540A (en) 1999-06-02

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