CN201627886U

CN201627886U - Hydraulic automobile tensioner

Info

Publication number: CN201627886U
Application number: CN2009202024058U
Authority: CN
Inventors: 徐台日; 卓炳
Original assignee: NEWSUN (NINGBO) BEARING MANUFACTURING Co Ltd
Current assignee: NEWSUN (NINGBO) BEARING MANUFACTURING Co Ltd
Priority date: 2009-12-14
Filing date: 2009-12-14
Publication date: 2010-11-10
Anticipated expiration: 2019-12-14

Abstract

The utility model relates to a hydraulic automobile tensioner, which comprises a tensioner body. The tensioner body is provided with a push rod which can extend externally and internally under external force. The push rod is sleeved with a spring. The bottom of a cavity of the body is provided with a cylinder sleeve. In the cavity of the cylinder sleeve hydraulic oils exerting the oil pressure on the push rod are packaged, and a throttle valve for adjusting the oil pressure is arranged. The hydraulic one-way throttle valve replaces the prior mechanical detent spring, thus providing the steady constant tension for the belt. The hydraulic automobile tensioner has the advantages of long service life, automatic compensation, simple assembly structure, light weight, strong impact resistance and the like.

Description

A kind of hydraulic type automobile stretcher

Technical field

The utility model relates to a kind of automobile stretcher, with automobile Timing Belt and the supporting use of Idle wheel, is used for the tightness of tightening belt.

Background technique

The automobile stretcher is to be used for the tightness of tightening belt, makes the belt can be not elongated as time passes or tension part wearing and tearing and cause tensioning inefficacy belt slack or come off.And existing such design of tensioners is to provide tension force by the mechanical detent spring type, as notification number CN2296937Y disclosed a kind of " automobile automatic tensioner " and CN2338205Y disclosed a kind of " motor car engine chain tensioning device " employing all is such design, the common issue with that they exist is to occur early stage fatigue easily, the tension force instability, and assembling is also more loaded down with trivial details.

And at present the component of car industry are to light, and therefore the miniaturization development need provide a kind of stretcher that enough big tension force can be provided in enough little space, and can keep tension stability, long service life.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of stable tension force that can provide at the prior art present situation, can play the hydraulic type automobile stretcher of automatic compensation and damping vibration attenuation function again.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: hydraulic type automobile stretcher, the body that comprises stretcher, be equipped with in the body one under external force can be inside and outside flexible push rod, be with cylindrical spring on the push rod, a cylinder sleeve is equipped with in the bottom that it is characterized in that described chamber body, be packaged with the hydraulic oil that push rod is imposed the oil pressure effect in the inner chamber of cylinder sleeve, and in inner chamber, be provided with the throttle valve that is used for regulating the oil pressure size.

The stretcher of aforementioned structure, its described throttle valve is located at the bottom of push rod, hydraulic oil in the cylinder sleeve inner chamber connects the pressure relief opening of throttle valve by oil circuit, steel ball is housed on the pressure relief opening, the throttle valve top is provided with throttling cap, effect has a volute spring under the throttling cap, and volute spring, throttling cap and throttle valve are loaded in the cylinder sleeve.

The stretcher of aforementioned structure is fixed with the guide sleeve that can pass for push rod on its described cylinder sleeve, describedly be enclosed within cylindrical spring one crown on the push rod on guide sleeve, and the other end withstands on the fixed plate that fixes with push rod.

Compared with prior art, advantage of the present utility model is:

1, hydraulic pressure adds the one-way throttle valve design and replaces existing mechanical ratchet spring type, can provide stable constant-tension for belt, and the life-span is longer.

2, by the automatic compensation of hydraulic pressure realization to the tension part wearing and tearing.

3, assembly structure is simple, and is in light weight, strong shock resistance.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is that the A of Fig. 1 is to view.

Embodiment

As shown in Figure 1 and Figure 2, the utility model hydraulic type automobile stretcher mainly is made of body 11, push rod 4, throttle valve 7, oil sealing 2, jump ring 1 and spring 5,9 etc., wherein, the body 11 of stretcher has a cylindrical cavity, a cylinder sleeve 10 is equipped with in the bottom of inner chamber, in order to hold throttle valve 7 and hydraulic oil 13 etc.

Throttle valve 7 is the sizes that are used for regulating oil pressure, and its below is covered with a throttling cap 8, is provided with a volute spring 9 between the diapire of throttling cap 8 and cylinder sleeve 10, and elastic force-applying is made in the outside of throttling cap.Be fixed with a guide sleeve 6 on the end of cylinder sleeve 10, this guide sleeve 6 can pass for push rod 4, plays the effect to push rod 4 guiding.Hydraulic oil 13 in cylinder sleeve 10 inner chambers is equipped with steel ball 12 by the pressure relief opening of oil circuit perforation throttle valve on the pressure relief opening.

Push rod 4 is located in the body 11, can make inside and outside fore and aft motion.One cylindrical spring 5 is housed on the push rod 4, and these cylindrical spring 5 one crowns are on guide sleeve 6, and the other end withstands on the fixed plate 3, and fixed plate 3 is fixed on the push rod 4.

Be contained in the push rod 4 in the body 11, the one end withstands on the throttle valve 7, contacts with it, and the other end stretches out outside the body 11, and locks together by lock pin 14 and body 11, and this lock pin 14 can be extracted.

Working principle: the motive force of the push rod of stretcher is to provide after the pressure by oil acts on throttle valve.When tension force acts on power size that power and oil pressure on the push rod provide when consistent, push rod maintenance balance; When power that the tension force power on the push rod that acts on provides greater than oil pressure, the power that oil pressure provides must increase just can reach new balance.Diminish along with moving down of push rod causes the space of fluid, it is big that oil pressure becomes, and so can reach new balance.If the power of push rod is too big, will cause the pressure of fluid to gather rising, can open a small ball in the throttle valve, be used for oil circuit is carried out drain charge, reached simultaneously the phenomenon of avoiding the excessive infringement belt of tension force that stretcher provides Timing Belt again.When tension force acts on power on the push rod little the time, push rod is elongation upwards, and the combination container space that contain hydraulic oil this moment increases at once, and the pressure that can provide this moment also will reduce rapidly.To cause throttle valve to separate owing to the instantaneous negative pressure that forms in action of gravity and the hydraulic container with inferior while steel ball, in the hydraulic container below the hydraulic oil that makes seepage above throttle valve is got back to by the hole of push rod bottom, as a kind of compensation of pressure with steel ball.The continual conversion of above-mentioned plurality of processes when motor racing like this realizes the tensioning to the automobile Timing Belt.

The utility model comes the flow direction of controlling liquid by one-way valve, one-way valve is closed gradually when bearing immense pressure, can not influence too soon or too slowly with the active force of outside, the anti-power of being hit is played good damping vibration attenuation effect, increase working life greatly.

Claims

1. hydraulic type automobile stretcher, the body that comprises stretcher, be equipped with in the body one under external force can be inside and outside flexible push rod, be with cylindrical spring on the push rod, it is characterized in that: a cylinder sleeve is equipped with in the bottom of described chamber body, be packaged with the hydraulic oil that push rod is imposed the oil pressure effect in the inner chamber of cylinder sleeve, and in inner chamber, be provided with the throttle valve that is used for regulating the oil pressure size.

2. hydraulic type automobile stretcher as claimed in claim 1, it is characterized in that: described throttle valve is located at the bottom of push rod, hydraulic oil in the cylinder sleeve inner chamber connects the pressure relief opening of throttle valve by oil circuit, steel ball is housed on the pressure relief opening, the throttle valve below is provided with throttling cap, effect has a volute spring under the throttling cap, and volute spring, throttling cap and throttle valve are loaded in the cylinder sleeve.

3. hydraulic type automobile stretcher as claimed in claim 2, it is characterized in that: be fixed with the guide sleeve that can supply push rod to pass on the described cylinder sleeve, describedly be enclosed within cylindrical spring one crown on the push rod on guide sleeve, the other end withstands on the fixed plate that fixes with push rod.