WO2019061464A1

WO2019061464A1 - Locking pin for use with locking spring of locking mechanical tensioner and mechanical tensioner

Info

Publication number: WO2019061464A1
Application number: PCT/CN2017/104909
Authority: WO
Inventors: 李鹏飞; 刘会粉
Original assignee: 舍弗勒技术股份两合公司; 李鹏飞
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2019-04-04
Also published as: CN110785583B; DE112017008106T5; CN110785583A

Abstract

A locking pin (3) for use with a spring (2) of a locking mechanical tensioner and a mechanical tensioner provided with the locking pin (3); the mechanical tensioner comprises a tensioner main body (1) and the spring (2) which is mounted on the tensioner main body (1), a fixed spring leg (22) of the spring (2) being fixedly mounted on the tensioner main body (1); the locking pin (3) comprises: an insertion portion (38), which is used for being inserted into a pin hole (12) of the tensioner main body (1) so as to mount the locking pin (3) onto the tensioner main body (1); a stopping portion (39), which is used for stopping a free spring leg (23) of the spring (2), thereby maintaining the spring in a compressed state; in a state wherein the locking pin (3) locks the spring (2), the insertion portion (38) and the stopping portion (39) are spaced apart in the compression and expansion direction of the free spring leg (23). The mechanical tensioner provided with the locking pin (3) reduces the material requirements for the spring (2) and is easy to assemble; meanwhile, the stress at the pin hole (12) is low, reducing the risk of failure.

Description

Locking pin and mechanical tensioner for locking the spring of the mechanical tensioner

Technical field

The present invention relates to a mechanical tensioner in a vehicle engine timing system, and more particularly to a locking pin for locking a spring of a mechanical tensioner and a mechanical tensioner incorporating the locking pin.

Background technique

As shown in FIGS. 1A and 1B, at present, a mechanical tensioner widely used in a chain drive system of a vehicle engine typically includes a spring (for example, a torsion spring) 2 and a tensioner body 1. The spring 2 is mounted on the tensioner body 1. The coil 21 of the spring 2 is mounted around the pivot 11 of the tensioner body 1 and is rotatable about the pivot 11. A fixed spring leg 22 of the spring 2 projecting from the coil 21 is fixedly mounted on the tensioner body 1. The free spring leg 23 of the spring 2 extending from the coil 21 can be pressed against the engine block (not shown). The torsion of the spring 2 presses the tensioner body 1 onto a chain (not shown) of the chain drive system.

The free spring legs 23 of the spring 2 are typically secured by locking pins 3 for pre-assembly and transport of the mechanical tensioners. The locking pin 3 generally includes an insertion portion 38 that is inserted into the pin hole 12 of the tensioner body 1 in a pre-assembled state of the mechanical tensioner; a blocking portion 39 that blocks the free spring leg 23; and the insertion portion 38 is connected to the grip portion 32 for gripping the locking pin 3 when the locking pin 3 is operated and may be formed, for example, in a substantially circular shape.

At present, the insertion portion 38 and the blocking portion 39 of the locking pin 3 are straight, that is, the insertion portion 38 and the blocking portion 39 extend in a straight line. However, since the position of the pin hole 12 of the tensioner body 1 is generally away from the position of the free spring leg 23 when the spring 2 is not compressed, in order to block the free spring leg 23 with the locking pin 3, the free spring leg 23 must be compressed with a high load. At a large angle, the insertion portion 38 of the locking pin 3 is inserted into the pin hole 12, and the free spring leg 23 is locked by the blocking portion 39.

Since the compression angle of the spring 2 (i.e., the free spring leg 23) is much larger than the working state of the spring 2 in the pre-assembled state, the spring 2 must be manufactured in accordance with the most severe compression conditions and high loads, so that It is difficult to assemble and is also detrimental to the normal function of the spring 2.

In addition, the material of the tensioner body 1 is preferably plastic. In this prior art, there is always a high stress at the pin hole 12 of the tensioner body 1, which is detrimental to the quality of the part and increases the failure. risk.

Another prior art is that the free spring legs 23 of the spring 2 are extended and bent several times so that the extension can extend into the vicinity of the pin hole 12. For example, referring to FIGS. 2A and 2B, the free spring leg 23 includes a straight portion 231 and a curved portion 232, and the tip end portion 232A of the curved portion 232 is blocked by the blocking portion 39 of the locking pin 3. The straight portion 231 and the end portion 232A are spaced apart from each other in the compression expansion direction of the free spring legs 23 about the coil 21. The distal end portion 232A is closer to the pin hole 12 of the tensioner body 1 than the linear portion 231, and the linear portion 231 is closer to the engine body than the distal end portion 232A. The straight portion 231 is for pressing against the engine block.

The design of such a spring is complicated, manufacturing difficulty and cost are high, and different application scenarios need to be designed separately.

Summary of the invention

It is an object of the present invention to find an effective way to lock a spring to the tensioner body such that the spring remains in a stable and reasonable condition during pre-assembly and transport.

The invention provides a locking pin and a mechanical tensioner equipped with the locking pin, which eliminates the pre-assembled state, that is, the excessive compression angle of the free spring leg in the spring-locked state, and reduces the tensioner body Stress near the pin hole.

A locking pin for locking a spring of a mechanical tensioner is provided, the mechanical tensioner including a tensioner body and a spring mounted to the tensioner body, the fixed spring leg of the spring being fixedly mounted to the The tensioner body, wherein the locking pin comprises:

An insertion portion for inserting into a pin hole of the tensioner body to mount the locking pin to the tensioner body;

a blocking portion for blocking a free spring leg of the spring to maintain the spring in a compressed state,

Wherein, in a state in which the locking pin locks the spring, the insertion portion and the blocking portion are spaced apart in a compression expansion direction of the free spring leg.

In at least one embodiment, the locking pin further includes a connecting portion that connects the insertion portion and the blocking portion.

In at least one embodiment, the locking pin has a generally U-shape and the connecting portion forms the bottom of the U-shape.

In at least one embodiment, the locking pin is substantially figured in the lower opening.

In at least one embodiment, a distance between the insertion portion and a distal end portion of the blocking portion away from the connecting portion is smaller than a proximal end portion of the insertion portion and the blocking portion adjacent to the connecting portion The distance between them.

In at least one embodiment, the insertion portion and the blocking portion are linear.

In at least one embodiment, the blocking portion is formed with a bend at a position to be in contact with the free spring leg.

In at least one embodiment, the locking pin further includes a grip portion between the grip portion and the insertion portion.

In at least one embodiment, the barrier appears as a bend.

In at least one embodiment, the mechanical tensioner is for tensioning a chain of a chain drive system, the locking pin for locking the spring at a first amount of compression, the first amount of compression being greater than the mechanical tension The second amount of compression of the spring is large when the tensioner is mounted to the chain drive system.

In at least one embodiment, the locking pin is bent from a metal wire.

The present invention also provides a mechanical tensioner assembled with a locking pin, comprising a tensioner body and a spring mounted to the tensioner body, the fixed spring leg of the spring being fixedly mounted to the tensioner body ,among them,

The insertion portion of the locking pin is inserted into a pin hole of the tensioner body, the locking pin The blocking portion blocks the free spring leg of the spring to maintain the spring in a compressed state.

In at least one embodiment, the tensioner body is made of plastic.

In at least one embodiment, the spring is a torsion spring.

In at least one embodiment, the free spring leg projects beyond the tensioner body.

It should be understood that, in the present application, "the insertion portion and the blocking portion are spaced apart in the compression expansion direction of the free spring leg in a state where the locking pin locks the spring" includes both the entire insertion And the entire blocking portion are spaced apart in the compression expansion direction, and also include at least the insertion of the insertion portion and the portion received in the pin hole and the portion of the blocking portion that is in contact with the free spring leg are spaced apart in the compression expansion direction .

In the lock pin and the mechanical tensioner of the present invention, in a state where the lock pin locks the spring, the insertion portion and the blocking portion are spaced apart in the compression expansion direction of the free spring leg. Compared with the case where the insertion portion and the blocking portion extend in a straight line, the compression amount of the spring is reduced in the pre-assembled state, or the compression amount of the spring in the pre-assembled state is closer to the mechanical tensioner installation. The amount of compression of the spring when it comes to the chain drive system. In this way, the design of the spring can be simplified, the material requirements for the spring can be reduced, and the assembly of the mechanical tensioner can be easily performed. At the same time, the stress at the pin holes is small, reducing the risk of failure.

DRAWINGS

1A and 1B show schematic views of a locking pin for locking a free spring leg and a mechanical tensioner assembled with the locking pin according to the prior art.

2A and 2B show a schematic view of another spring according to the prior art and a mechanical tensioner including the spring and assembled with the locking pin of Fig. 1A.

3A and 3B show schematic views of a locking pin for locking a free spring leg and a mechanical tensioner assembled with the locking pin according to a first embodiment of the present invention.

4A and 4B illustrate a lock for a free spring leg in accordance with a second embodiment of the present invention. A schematic view of a locking pin and a mechanical tensioner incorporating the locking pin.

5A and 5B are schematic views showing a locking pin for locking a free spring leg and a mechanical tensioner assembled with the locking pin according to a third embodiment of the present invention.

Description of the reference numerals

1 tensioner body, 11 pivots, 12 pin holes, 2 springs, 21 coils, 22 fixed spring legs, 23 free spring legs, 231 free spring leg straight part, 232 free spring leg bending part, 232A curved part End portion, 3 locking pin, 32 gripping portion, 37 connecting portion, 38 inserting portion, 39 blocking portion.

Detailed ways

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings.

First embodiment

3A and 3B, the mechanical tensioner of the present embodiment includes a spring (e.g., a torsion spring) 2 and a tensioner body 1 made of, for example, plastic. The spring 2 is mounted on the tensioner body 1. The coil 21 of the spring 2 is mounted around the pivot 11 of the tensioner body 1 and is rotatable about the pivot 11. A fixed spring leg 22 of the spring 2 projecting from the coil 21 is fixedly mounted on the tensioner body 1. The free spring leg 23 of the spring 2 extending from the coil 21 projects beyond the tensioner body 1 and is pressed against the engine block (not shown) when the tensioner is in operation. The portion of the tensioner body 1 on the opposite side of the side of the fixed spring leg 22 on which the free spring legs 23 are located may be pressed against a chain (not shown) of the chain drive system. The torsion of the spring 2 presses the tensioner body 1 onto the chain of the chain drive system.

The locking pin 3 includes an insertion portion 38 that is inserted into the pin hole 12 of the tensioner body 1 in a pre-assembled state of the mechanical tensioner; a blocking portion 39 that blocks the free spring leg 23; and a connection insertion portion 38 And a connecting portion 37 of the blocking portion 39, which can also serve as a gripping portion for gripping the locking pin 3 when the locking pin 3 is operated. The locking pin 3 locks the spring 2 at a first amount of compression which is preferably greater than the second amount of compression of the spring 2 when the mechanical tensioner is mounted to the chain drive system.

The locking pin 3 has a substantially U-shape, and the connecting portion 37 constitutes the bottom of the U-shape.

In order to further prevent the free spring leg 23 from being detached from the blocking portion 39, the distance D1 between the insertion portion 38 and the distal end portion of the blocking portion 39 away from the connecting portion 37 may be smaller than the proximal end of the insertion portion 38 and the blocking portion 39 close to the connecting portion 37. The distance between the parts is D2. It is possible to satisfy the case where D1 is smaller than D2 only in the case where the lock pin 3 is not mounted to the mechanical tensioner, and it is preferable to satisfy the case where D1 is smaller than D2 after the lock pin is mounted to the mechanical tensioner.

The locking pin 3 of the present embodiment can be formed by bending a metal wire.

As described above, the insertion portion 38 and the blocking portion 39 of the locking pin 3 are not in a straight line, but are spaced apart from each other in the direction of compression expansion of the free spring legs 23 about the coil 21 (see double arrow F in Fig. 3B). open. Thus, in the pre-assembled state, the amount of compression of the spring 2 is reduced, or the amount of compression of the spring 2 in the pre-assembled state is closer to the machine than in the case where the insertion portion and the blocking portion extend in a straight line. The amount of compression of the spring 2 when the tensioner is mounted to the chain drive system. In this way, the design of the spring 2 can be simplified, the material requirements for the spring 2 can be reduced, and the assembly of the mechanical tensioner can be easily performed. At the same time, the stress at the pin hole 12 is small, reducing the risk of failure.

Second embodiment

A locking pin and a mechanical tensioner incorporating the same according to a second embodiment of the present invention will now be described with reference to Figs. 4A and 4B. The same or similar components as those of the first embodiment are denoted by the same reference numerals, and detailed description of these structures will be omitted.

The structure of the lock pin 3 in the present embodiment is different from that of the lock pin 3 in the first embodiment.

In the present embodiment, the locking pin 3 includes an insertion portion 38 that is inserted into the pin hole 12 of the tensioner body 1 in a pre-assembled state of the mechanical tensioner; a blocking portion 39 that blocks the free spring leg 23 And a connecting portion 37 connecting the insertion portion 38 and the blocking portion 39, which can also serve as a grip portion for gripping the locking pin 3 when the locking pin 3 is operated.

The entire locking pin 3 has a "8" shape with a lower unsealed shape, and the connecting portion 37 has a substantially circular shape. The insertion portion 38 and the blocking portion 39 of the locking pin 3 are not in a straight line, but are wound around the free spring leg 23. The compression expansion directions of the rings 21 are spaced apart from each other.

As in the first embodiment, the locking pin 3 of the present embodiment can be formed by bending a single metal wire.

The other structure of this embodiment is basically the same as that of the first embodiment. This embodiment can obtain the same effects as those of the first embodiment.

Third embodiment

A locking pin and a mechanical tensioner incorporating the same according to a third embodiment of the present invention will now be described with reference to Figs. 5A and 5B. The same or similar components as those of the first embodiment are denoted by the same reference numerals, and detailed description of these structures will be omitted.

In the present embodiment, the locking pin 3 includes an insertion portion 38 that is inserted into a pin hole in the tensioner body 1 in a pre-assembled state of the mechanical tensioner, and a blocking portion 39 that blocks the free spring leg 23 And a grip portion 32 coupled to the blocking portion 39, the grip portion 32 being substantially annular for gripping the locking pin 3 when the locking pin 3 is operated.

The blocking portion 39 is located between the insertion portion 38 and the grip portion 32. The blocking portion 39 is formed in a curved shape such that the top of the blocking portion 39 (i.e., the portion for contacting the free spring leg 23) and the insertion portion 38 are not in a straight line, but around the coil 21 of the free spring leg 23. The compression expansion directions are spaced apart from each other.

The locking pin of the present invention provides an effective solution for spring fixing, that is, the spring can be pre-assembled on the tensioner body with a non-linear locking pin easily and qualitatively, and the result of the pre-assembly can be reasonably lowered. Risk of failure.

Of course, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made to the above-described embodiments of the present invention without departing from the scope of the invention.

(1) In the above embodiment, the structure of the tensioner body 1, including the pin holes 12, is not the same, however, this does not hinder the application of the locking pin of the present invention. The locking pin in one embodiment can in principle also be applied to the tensioner body 1 of other embodiments.

(2) The insertion portion and the blocking portion may each be linear or non-linear. For example, the blocking portion 39 in the first and second embodiments may include a curved portion similar to the blocking portion 39 of the third embodiment for receiving the free spring leg 23. This further prevents the free spring leg 23 from being detached from the blocking portion 39.

Claims

a locking pin for locking a spring of a mechanical tensioner, the mechanical tensioner comprising a tensioner body and a spring mounted to the tensioner body, the fixed spring leg of the spring being fixedly mounted to the a tensioner body, wherein the locking pin comprises:

An insertion portion for inserting into a pin hole of the tensioner body to mount the locking pin to the tensioner body;

a blocking portion for blocking a free spring leg of the spring to maintain the spring in a compressed state,

Wherein, in a state in which the locking pin locks the spring, the insertion portion and the blocking portion are spaced apart in a compression expansion direction of the free spring leg.
The locking pin according to claim 1, wherein the locking pin further includes a connecting portion that connects the insertion portion and the blocking portion.
The locking pin according to claim 2, wherein said locking pin has a substantially U-shape, and said connecting portion forms a bottom of said U-shape.
The locking pin according to claim 2, wherein the locking pin has a substantially figure-eight shape with a lower opening.
The locking pin according to any one of claims 2 to 4, wherein a distance between the insertion portion and a distal end portion of the blocking portion away from the connecting portion is smaller than the insertion portion and the The distance between the base end of the blocking portion that is close to the connecting portion.
The lock pin according to any one of claims 1 to 5, wherein the insertion portion and the blocking portion are linear.
The lock pin according to any one of claims 1 to 5, wherein the blocking portion is formed with a bent portion at a position to be in contact with the free spring leg.
The locking pin according to claim 1, wherein the locking pin further comprises a grip portion, the blocking portion being located between the grip portion and the insertion portion.
The locking pin according to claim 8, wherein the blocking portion is presented as a bent portion.
A locking pin according to any one of claims 1 to 9, wherein the mechanical tensioner is used to tension a chain of a chain drive system for locking the spring in a first compression The first amount of compression is greater than a second amount of compression of the spring when the mechanical tensioner is mounted to the chain drive system.
A locking pin according to any one of claims 1 to 10, wherein the locking pin is bent from a metal wire.
A mechanical tensioner assembled with a locking pin, comprising a tensioner body and a spring mounted to the tensioner body, the fixed spring leg of the spring being fixedly mounted to the tensioner body, wherein ,

The locking pin is a locking pin according to any one of claims 1 to 11, the insertion portion of the locking pin being inserted into a pin hole of the tensioner body, the blocking of the locking pin The free spring leg of the spring is blocked to maintain the spring in a compressed state.
A mechanical tensioner assembled with a locking pin according to claim 12, wherein the tensioner body is made of plastic.
A mechanical tensioner assembled with a locking pin according to claim 12 or 13, wherein the spring is a torsion spring.
A mechanical tensioner assembled with a locking pin according to any one of claims 12 to 14, wherein the free spring leg projects beyond the tensioner body.