CN217234288U - Pawl matching structure of tensioner - Google Patents

Abstract

The utility model discloses a tensioning ware's pawl cooperation structure, include with the pawl of rack joint, the pawl passes through the pin to be fixed on the tensioning ware body, the middle part tight fit of pawl and pin, the both ends joint of pin just is clearance fit on the tensioning ware body. By adopting the utility model, the pawl is tightly matched with the middle part of the pin, and the two ends of the pin are in clearance fit on the tensioner body; analysis shows that when the size of the clearance fit clearance is the same, the larger the axial length of the clearance is, the smaller the bouncing angle of the pawl is; therefore, for original round pin axle, pawl clearance fit, round pin axle both ends tight fit structure on tensioning ware body, axial length is the pawl thickness that current design was got, and this application is then the cooperation total length at pin both ends, therefore this application has increased the axial length of clearance department effectively, has reduced the angle of beating of pawl effectively, has improved the stability of pawl in the use.

Description

Pawl matching structure of tensioner

Technical Field

The utility model relates to a tensioning ware, especially a pawl cooperation structure of tensioning ware.

Background

The pawl and the pawl pin are matched in the rack-type chain adjusting device of the motorcycle engine, the rack is arranged in a rack hole on the adjusting device, when the adjusting device assembly works in the engine, the rack outwards props against a gas distribution tensioning strip and a chain of the engine under the action of a rack spring, the shaking (tensioning) of the gas distribution chain can generate a retraction force on the rack in the adjusting device during the work, the pawl assembled in a pawl groove of an adjusting device body props against the rack under the action of a pawl spring to prevent the rack from retracting, meanwhile, the continuous work of the gas distribution chain can also enable the chain to stretch to generate slack, and at the moment, the rack in the adjusting device outwards extends out under the action of the rack spring to restore the slack caused by the stretching of the chain to enable the rack to recover the tight working state. Current round pin axle and pawl are clearance fit, and round pin axle then tight fit installs on adjusting device, and the pawl rotates round pin axle relatively when using, and this kind of structure makes rocking of pawl big, leads to the reliability reduction of pawl.

Disclosure of Invention

The utility model aims to provide a: the ratchet matching structure of the tensioner can reduce the shaking amount of the ratchet under the same clearance state.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

the utility model provides a pawl cooperation structure of tensioning ware, includes the pawl with the rack joint, and the pawl passes through the pin to be fixed on the tensioning ware body, the middle part tight fit of pawl and pin, the both ends joint of pin just is clearance fit on the tensioning ware body.

By adopting the technical scheme, the utility model has the advantages that the pawl is tightly matched with the middle part of the pin, and the two ends of the pin are in clearance fit on the tensioner body; analysis shows that when the size of the clearance fit clearance is the same, the larger the axial length of the clearance is, the smaller the angle of the pawl capable of jumping is; therefore, for original round pin axle, pawl clearance fit, round pin axle both ends tight fit structure on tensioning ware body, axial length is the pawl thickness that current design was got, and this application is then the cooperation total length at pin both ends, therefore this application has increased the axial length of clearance department effectively, has reduced the angle of beating of pawl effectively, has improved the stability of pawl in the use.

Further, the pin is a cylindrical pin. The cylindric lock simple to operate is swift.

Furthermore, one end of the pawl is provided with a clamping tooth which is clamped with the rack. The pawl and the rack are clamped and fixed through the clamping teeth.

Furthermore, the other end of the pawl is provided with a pawl spring, and the pawl spring is abutted with the plane of the side edge of the pawl. The pawl spring is tightly propped against the plane of the pawl, so that the pawl is conveniently pushed to rotate.

Further, the end of the pawl is provided with a protruding clamping part towards the pawl spring. The pawl spring is convenient to push the pawl to rotate, and meanwhile, the clamping part can avoid the pawl spring from slipping.

Furthermore, the rack is provided with a blind hole, one end of a rack spring is accommodated in the blind hole, and the other end of the rack spring is abutted to the screw plug of the tensioner body. The rack spring provides power for the outward movement of the rack.

Further, the plug screw is provided with a cylindrical hole and accommodates the other end of the rack spring. The both ends of rack spring all block in corresponding downthehole, it is better to the fixed effect of rack spring.

Furthermore, the pawl is made of powder metallurgy, and the rack is made of steel.

Furthermore, the interference between the pawl and the pin is 0.002mm-0.02 mm. The proper interference magnitude facilitates the assembly of the pawl and the pin and plays a role in tight fit.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

the pawl is tightly matched with the middle part of the pin, and two ends of the pin are in clearance fit with the tensioner body; analysis shows that when the size of the clearance fit clearance is the same, the larger the axial length of the clearance is, the smaller the bouncing angle of the pawl is; therefore, for original round pin axle, pawl clearance fit, round pin axle both ends tight fit structure on tensioning ware body, axial length is got for pawl thickness to current design, and this application is then for the cooperation total length at pin both ends, therefore this application has increased the axial length of clearance department effectively, has reduced the angle of beating of pawl effectively, has improved the stability in the pawl use.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic view of a pawl engagement structure of a tensioner of the present invention.

Figure 2 shows a partial cross-sectional view of the pawl and pin connection of figure 1.

Figure 3 shows the engagement of a pawl with a pin in the prior art.

Fig. 4 shows the engagement of the pawl with the pin in the present application.

Wherein the figures include the following reference numerals:

10. a rack; 20. a pawl; 21. clamping teeth; 22. a clamping part; 30. a pin; 40. a detent spring; 50. a plug screw; 60. a rack spring.

Detailed Description

It is to be noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1 and 2, a pawl matching structure of a tensioner comprises a pawl 20 clamped with a rack 10, wherein the pawl 20 is fixed on a tensioner body through a pin 30, the pawl 20 is tightly matched with the middle part of the pin 30, and two ends of the pin 30 are clamped on the tensioner body and are in clearance fit.

By adopting the technical scheme, the utility model has the advantages that the pawl 20 is tightly matched with the middle part of the pin 30, and the two ends of the pin 30 are in clearance fit on the tensioner body; analysis shows that when the size of the clearance fit clearance is selected to be the same, the larger the axial length of the clearance, the smaller the angle at which the pawl 20 can jump; therefore, for original round pin axle, 20 clearance fit of pawl, round pin axle both ends tight fit structure on the tensioning ware body, axial length is 20 thickness of pawl to the axial length of taking of current design, and this application then is the cooperation total length at pin 30 both ends, therefore this application has increased the axial length of clearance department effectively, has reduced pawl 20's the angle of beating effectively, has improved the stability of pawl 20 in the use.

Further, the pin 30 is a cylindrical pin. Cylindric lock simple to operate is swift.

Further, one end of the pawl 20 is provided with a catching tooth 21, and is caught to the rack 10 by the catching tooth 21. The pawl 20 and the rack 10 are fixed by snap-in teeth 21.

Further, a click spring 40 is provided at the other end of the click 20, and the click spring 40 abuts against a flat surface on the side of the click 20. Detent spring 40 abuts against the flat surface of detent 20 to facilitate urging detent 20 to rotate.

Further, the end of the click 20 is provided with a protruding gripping part 22 toward the click spring 40. It is convenient for detent spring 40 to urge detent 20 to rotate while retaining portion 22 prevents detent spring 40 from slipping.

Further, the rack 10 is provided with a blind hole, and one end of the rack spring 60 is accommodated in the blind hole, and the other end of the rack spring 60 abuts against the screw plug 50 of the tensioner body. Rack spring 60 powers the outward movement of rack 10.

Further, the plug screw 50 is opened with a cylindrical hole and receives the other end of the rack spring 60. Both ends of the rack spring 60 are clamped into the corresponding holes, so that the rack spring 60 is better fixed.

Further, the pawl 20 is made of powder metallurgy, and the rack 10 is made of steel.

Further, the interference between the pawl 20 and the pin 30 is 0.002mm-0.02 mm. The appropriate interference facilitates assembly of the pawl 20 with the pin 30 while providing a tight fit.

Fig. 3 shows a state where the pawl 20 is clearance-fitted with the pin 30, and both ends of the pin 30 are tightly fitted with the tensioner body, so that when the clearance is H, the axial length (hole length) of the clearance of the pawl 20 is L1, and the runout angle of the pawl 20 is a 1;

fig. 4 shows a state where the pawl 20 is tightly fitted to the pin 30 and both ends of the pin 30 are loosely fitted to the tensioner body, so that when the clearance is H, the axial length (hole length) of the clearance of the pawl 20 is L2, and the angle at which the pawl 20 can jump is a 2;

comparison shows that L1 is less than L2, and a1 is more than a 2;

that is, when the fitting manner of the present application is adopted (the pawl 20 and the pin 30 are tightly fitted, and both ends of the pin 30 and the tensioner body are in clearance fit), the jumping angle of the pawl 20 is smaller.

The scope of the present invention is defined not by the above-described embodiments but by the appended claims and equivalents thereof.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (9)

1. The utility model provides a pawl cooperation structure of tensioning ware, its characterized in that includes pawl (20) with rack (10) joint, pawl (20) are fixed on the tensioning ware body through pin (30), pawl (20) with the middle part tight fit of pin (30), the both ends joint of pin (30) is in on the tensioning ware body and be clearance fit.

2. The pawl engagement structure for a tensioner according to claim 1, wherein said pin (30) is a cylindrical pin.

3. The pawl engagement structure of a tensioner according to claim 1, wherein said pawl (20) is provided at one end with an engagement tooth (21) and is engaged with said rack (10) via said engagement tooth (21).

4. The pawl engagement structure of a tensioner according to claim 3, wherein the other end of the pawl (20) is provided with a pawl spring (40), and the pawl spring (40) abuts against a flat surface of a side of the pawl (20).

5. The pawl engagement structure of a tensioner according to claim 4, wherein an end of the pawl (20) is provided with a protruding gripping portion (22) toward the pawl spring (40).

6. The pawl engagement structure of a tensioner according to claim 1, wherein the rack (10) is provided with a blind hole, and one end of a rack spring (60) is received in the blind hole, and the other end of the rack spring (60) abuts against a plug screw (50) of the tensioner body.

7. The pawl engagement structure for a tensioner according to claim 6, wherein said plug screw (50) is bored with a cylindrical hole and receives the other end of said rack spring (60).

8. The pawl engagement structure for a tensioner according to claim 1, wherein said pawl (20) is powder metallurgy and said rack (10) is made of steel.

9. The pawl engagement structure of a tensioner according to claim 1, wherein the interference of the pawl (20) with the pin (30) is 0.002mm-0.02 mm.

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