CN217481878U

CN217481878U - Hydraulic tensioner with internal circulation structure

Info

Publication number: CN217481878U
Application number: CN202221586375.7U
Authority: CN
Inventors: 汪恭兵; 邢建恒; 包翔; 陈腾霄; 张柏成
Original assignee: Hangzhou Donghua Automobile Power Technology Co ltd
Current assignee: Hangzhou Donghua Automobile Power Technology Co ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-09-23
Anticipated expiration: 2032-06-23

Abstract

The utility model relates to a hydraulic pressure tensioning ware especially relates to a hydraulic pressure tensioning ware of inner loop structure. The method comprises the following steps: a tensioner housing; a plunger slidably inserted into a plunger receiving hole of the tensioner housing, one end of the plunger extending from the plunger receiving hole and an end of the plunger extending to contact the vibrating object; one end of the plunger spring extends into the hollow part of the plunger and applies force to the plunger in the direction that the plunger extends out of the plunger accommodating hole, and the other end of the plunger spring is in contact with the one-way valve at the bottom of the plunger accommodating hole; an oil storage cavity is arranged in the tensioner shell and is communicated with the one-way valve through an oil inlet channel at the bottom of the plunger accommodating hole. The problem that the hydraulic tensioner is difficult to arrange in an industrial production line without a hydraulic system is solved by arranging the oil storage cavity in the tensioner shell.

Description

Hydraulic tensioner with internal circulation structure

Technical Field

The utility model relates to a hydraulic pressure tensioning ware especially relates to a hydraulic pressure tensioning ware of inner loop structure.

Background

The existing tensioner is mainly divided into a mechanical tensioner and an external circulation hydraulic tensioner, the mechanical tensioner is mainly applied to a motorcycle timing system or an industrial production line, and when the mechanical tensioner provides tension for a chain transmission mechanism in a motorcycle or the industrial production line, the damping effect is realized only through a spring, and the damping capacity is weak; the external circulation hydraulic tensioner is mostly applied to high-end motorcycle and passenger car engines, and if the external circulation hydraulic tensioner is applied to an industrial production line, the problem of poor damping effect of the mechanical tensioner is solved, but the external circulation hydraulic tensioner needs external oil supply, so the external circulation hydraulic tensioner is difficult to arrange in the industrial production line without a hydraulic system.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a hydraulic tensioner with an internal circulation structure to solve the above problems in the prior art.

To achieve the above object, the present invention provides a hydraulic tensioner of an internal circulation structure, including: a tensioner housing; a plunger slidably inserted into a plunger receiving hole of the tensioner housing, one end of the plunger extending from the plunger receiving hole and an end of the plunger extending to contact the vibrating object; one end of the plunger spring extends into the hollow part of the plunger and applies force to the plunger in the direction that the plunger extends out of the plunger accommodating hole, and the other end of the plunger spring is in contact with the one-way valve at the bottom of the plunger accommodating hole; an oil storage cavity is formed in the tensioner shell and is communicated with the one-way valve through an oil inlet channel at the bottom of the plunger accommodating hole. Through set up the oil storage chamber in the tensioning ware casing, realize the purpose from the oil feed to solve hydraulic tensioning ware and hardly arrange the problem that does not have hydraulic system's industrial assembly line.

The plunger comprises an upper part and a lower part, wherein the upper part is in clearance fit with the plunger accommodating hole, and the diameter of the lower part is smaller than that of the upper part and is matched with the lower end of the plunger accommodating hole to form a leakage channel; the lower part of the plunger is provided with an annular pressure reducing groove, one side of the annular pressure reducing groove is provided with a backflow hole, and the backflow hole is communicated with the oil storage cavity; the oil storage chamber is provided with upward extending parts close to two sides of the lower part of the plunger, and one of the upward extending parts of the oil storage chamber is communicated with the plunger accommodating hole through a backflow hole on one side of the annular decompression groove on the plunger.

When the vibrating object moves upwards, the plunger spring pushes the plunger to move upwards, the one-way valve is opened, and the hydraulic oil in the oil storage cavity is pumped into the plunger; when the vibration object compresses downwards, the check valve is closed rapidly, a high-pressure oil cavity is formed inside the plunger, high-pressure liquid oil enters an annular pressure release area of the plunger through a leakage channel to form a low-pressure oil cavity, then enters an oil storage cavity through a backflow hole, partial hydraulic oil can enter a gap between the plunger accommodating hole and the plunger, the oil pressure is reduced rapidly after the pressure of the annular groove is released, the partial hydraulic oil cannot leak out from the gap between the plunger accommodating hole and the plunger, and meanwhile, the sealing ring can effectively prevent the hydraulic oil from leaking out.

It is further provided that the width of the leakage channel is 0.07 mm.

The utility model discloses further set up, seted up annular groove on the lateral wall of plunger upper portion, this recess endotheca is equipped with the sealing washer, can reduce hydraulic oil and accomodate the clearance between the hole from plunger and leak to can also place during outside dust gets into the working chamber.

The utility model discloses following beneficial effect has: through set up the oil storage chamber in the tensioning ware casing, realize the purpose from the oil feed to solve hydraulic tensioning ware and hardly arrange the problem that does not have hydraulic system's industrial assembly line.

Drawings

Fig. 1 is a sectional view showing a use state of the present invention when a vibrating object vibrates downward.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Fig. 3 is a sectional view showing a use state of the present invention when the vibrating object vibrates upward.

Reference numerals are as follows: a tensioner housing 10, a plunger accommodating hole 11, an oil inlet passage 12, an oil storage chamber 13, an upward extending portion 130, a return hole 15;

plunger 20, hollow part 21, plunger spring 22, annular decompression groove 23, groove 24 and sealing ring 25;

a check valve 30;

the object 50 is vibrated.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

The embodiment of the utility model is as follows

Referring to fig. 1 and 3, the present invention provides a hydraulic tensioner with an internal circulation structure, including: tensioner housing 10, plunger 20, plunger spring 22, check valve 30, and oil reservoir 13.

Wherein the plunger 20 is slidably inserted into the plunger receiving hole 11 of the tensioner housing 10, one end of the plunger 20 extends from the plunger receiving hole 11 and the end of the plunger 20 extending out is in contact with the vibrating object 50; one end of the plunger spring 22 extends into the hollow part 21 of the plunger 20 and applies force to the plunger 20 towards the direction that the plunger 20 extends out of the plunger accommodating hole 11, and the other end thereof is contacted with the one-way valve 30 at the bottom of the plunger accommodating hole 11; further, an oil reservoir chamber 13 is provided in the tensioner housing 10, and the oil reservoir chamber 13 communicates with the check valve 30 through an oil inlet passage 12 at the bottom of the plunger accommodating hole 11.

When the vibrating object 50 moves upward, the plunger spring 22 pushes the plunger 20 to move upward, the check valve 30 opens, the hydraulic oil in the oil storage chamber 13 is drawn into the plunger 20, and in the process, a small negative pressure exists in the hollow part 21 of the plunger 20, so that the upward thrust force applied to the plunger 20 is slightly smaller than the spring force.

As an embodiment of the present invention, referring to fig. 2, the plunger 20 is divided into an upper portion and a lower portion, wherein the upper portion of the plunger 20 is in clearance fit with the plunger accommodating hole 11, the lower portion of the plunger 20 has a diameter smaller than the upper portion of the plunger 20 and is fitted with the lower end of the plunger accommodating hole 11 to form a leakage passage 26, and the width of the leakage passage 26 is 0.07 mm; an annular groove 24 is formed in the side wall of the upper portion of the plunger 20, and a sealing ring 25 is sleeved in the groove 24; and the lower portion of the plunger 20 is provided with an annular pressure-reducing groove 23, and one side of the annular pressure-reducing groove 23 is provided with a return hole 15, the return hole 15 being located on the left or right side of the annular pressure-reducing groove 23 while the return hole 15 communicates with the oil storage chamber 13.

In this embodiment, when the vibrating object 50 is compressed downward, the check valve 30 is closed rapidly, a high pressure oil chamber is formed inside the plunger 20, oil in the high pressure oil chamber enters the annular pressure reducing groove 23 of the plunger 20 through the leakage passage 26, and the annular pressure reducing groove 23 and the inner wall of the plunger receiving hole 11 form a low pressure oil chamber, while the oil enters the oil storage chamber 13 through the return hole 15 on the side of the annular pressure reducing groove 23, so that the self-sufficient effect is achieved.

In the process, although a part of hydraulic oil enters between the tensioner housing 10 and the plunger 20, after the hydraulic oil is decompressed through the annular groove, the oil pressure entering the gap between the plunger accommodating hole 11 and the plunger 20 is reduced, and the leakage of the hydraulic oil in the gap can be effectively prevented through the sealing ring 25; due to the annular groove 24 and the sealing ring 25, external dust is prevented from entering the chamber from the gap when the plunger 20 moves up and down.

As an embodiment of the present invention, the upward extending portion 130 near the lower portion of the plunger 20 is disposed on the oil storage chamber 13, one of the upward extending portions 130 of the oil storage chamber 13 is communicated with the plunger accommodating hole 11 through the return hole 15 on one side of the annular pressure reducing groove 23 on the plunger 20, wherein the return hole 15 may be one side of the upward extending portion on the left side or one side of the upward extending portion on the right side.

When the vibration object 50 vibrates, the vibration object 50 applies force downwards, at the moment, the one-way valve is closed quickly, a high-pressure oil cavity is formed in the hollow part 21 of the plunger 20, the pressure of the high-pressure oil cavity is mainly determined by the downward compression speed of the plunger 20, liquid oil enters an annular pressure relief area of the plunger 20 through a leakage channel to form a low-pressure oil cavity and then enters the oil storage cavity 13 through the return hole 15, part of the hydraulic oil enters a gap between the plunger accommodating hole 11 and the plunger 20, but the oil pressure is quickly reduced after passing through the annular pressure relief groove 23, the part of the hydraulic oil cannot leak out from the gap between the plunger accommodating hole 11 and the plunger 20, meanwhile, because the annular groove 24 is formed in the upper part of the plunger 20 and the sealing ring 25 is sleeved in the groove 24, through the matching of the sealing ring 25 and the plunger accommodating hole 11, not only can the leakage of the hydraulic oil between the plunger 20 and the plunger receiving hole 11 be prevented, but also external dust can be prevented from entering the working chamber; when the vibrating object 50 moves upward, the plunger spring 22 pushes the plunger 20 to move upward, the check valve 30 is opened, and the hydraulic oil in the oil chamber 13 is drawn into the hollow portion 21 of the plunger 20, at which time, the end of the plunger 20 contacts the vibrating object 50 and provides tension to the vibrating object 50, thereby achieving the effect of first damping the transmission of the vibrating object 50.

The above, only be the embodiment of the preferred of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, which are designed to be replaced or changed equally, all should be covered within the protection scope of the present invention.

Claims

1. A hydraulic tensioner of internal circulation construction comprising: a tensioner housing (10); a plunger (20) slidably inserted into the plunger receiving hole (11) of the tensioner housing (10), wherein one end of the plunger (20) extends from the plunger receiving hole (11) and the extended end of the plunger (20) is in contact with the vibrating object (50); a plunger spring (22), wherein one end of the plunger spring extends into the hollow part (21) of the plunger (20) and applies force to the plunger (20) towards the direction that the plunger (20) extends out of the plunger accommodating hole (11), and the other end of the plunger spring is contacted with a one-way valve (30) at the bottom of the plunger accommodating hole (11); the tensioner is characterized in that an oil storage cavity (13) is arranged in the tensioner shell (10), and the oil storage cavity (13) is communicated with the one-way valve (30) through an oil inlet channel (12) at the bottom of the plunger accommodating hole (11).

2. The hydraulic tensioner of an internal circulation structure as claimed in claim 1, wherein the upper portion of the plunger (20) is in clearance fit with the plunger receiving hole (11), and the lower portion of the plunger (20) has a smaller diameter than the upper portion of the plunger (20) and forms the leakage passage (26) in cooperation with the lower end of the plunger receiving hole (11).

3. The hydraulic tensioner of an internal circulation structure as claimed in claim 2, wherein the lower portion of the plunger (20) is provided with an annular pressure relief groove (23), and one side of the annular pressure relief groove (23) is provided with a return hole (15), the return hole (15) being located at the left or right side of the annular pressure relief groove (23) while the return hole (15) communicates with the oil reservoir chamber (13).

4. A hydraulic tensioner of an internal circulation structure as claimed in claim 3, wherein the oil reservoir chamber (13) is provided with an upward extending portion (130) near a lower portion of the plunger (20), and one of the upward extending portions (130) of the oil reservoir chamber (13) communicates with the plunger accommodating hole (11) through a return hole (15) at a side of the annular pressure relief groove (23) of the plunger (20).

5. The hydraulic tensioner as claimed in claim 2, wherein the width of the leakage path (26) is 0.07 mm.

6. The hydraulic tensioner as claimed in claim 1, wherein the plunger (20) has an annular groove (24) formed in an upper side wall thereof, and the groove (24) is fitted with a sealing ring (25).