CN210134983U

CN210134983U - Locking structure of camshaft phaser

Info

Publication number: CN210134983U
Application number: CN201920970172.XU
Authority: CN
Inventors: 刘佑杰; 王川; 何马力; 杨韬; 张�林
Original assignee: Mianyang Fulin Precision Machinery Co Ltd
Current assignee: Mianyang Fulin Precision Machinery Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-03-10
Anticipated expiration: 2029-06-25

Abstract

The utility model provides a locking structure of camshaft phaser, including sprocket, casing, rotor and lockpin, the rotor pass through rotor blade and separate into hysteresis back chamber and advance chamber with the casing inner chamber, lockpin and sprocket between form normal unblock oil pocket, normal unblock oil pocket and advance chamber and communicate with each other, the sprocket on form the sprocket oil groove, the rotor on form the rotor oil groove, the lockpin on form reverse unblock stress surface, lockpin and rotor between form reverse unblock oil pocket, reverse unblock stress surface be located reverse unblock oil pocket, rotor oil groove, sprocket oil groove, the hysteresis chamber between communicate and form the reverse unblock oil duct of lockpin. The utility model discloses can realize that the lockpin lifts up the unblock fast to prevent lockpin unblock difficulty or unblock effectively, and be favorable to alleviateing and avoid even leading to part abnormal wear because of the friction contact between lockpin and the rotor.

Description

Locking structure of camshaft phaser

Technical Field

The utility model belongs to the technical field of camshaft phaser locking design and specifically relates to a locking structure of camshaft phaser is related to.

Background

The existing camshaft phaser is designed with a lock pin mechanism to meet the timing purpose before assembly.

However, in the conventional lock pin structure, under the condition of low temperature and high pressure, the lifting speed of the lock pin is lower than the speed of the rotor completely rotating the gap of the lock pin, so that the lock pin is abutted against the lock pin hole, the lock pin is subjected to the rotating force of the rotor, the lock pin cannot be lifted, and then the camshaft phaser cannot be adjusted, namely the lock pin is difficult to unlock or cannot be unlocked easily. In addition, when the conventional lock pin structure works, the end part of the lock pin is in long-term stress friction contact with the end surface of the part where the lock pin hole is located due to the acting force of the lock pin spring, and abnormal abrasion of the part where the lock pin hole is located can be caused due to high hardness of the lock pin.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: to the problem that prior art exists, provide a locking structure of camshaft phaser, prevent that the lockpin unblock is difficult or not unblock.

The to-be-solved technical problem of the utility model adopts following technical scheme to realize: a locking structure of a camshaft phaser comprises a chain wheel, a shell, a rotor and a lock pin, wherein the rotor divides an inner cavity of the shell into a back delay cavity and an advance cavity through a rotor blade, a normal unlocking oil cavity is formed between the lock pin and the chain wheel and is communicated with the advance cavity, a chain wheel oil groove is formed on the chain wheel, a rotor oil groove is formed on the rotor, a reverse unlocking stress surface is formed on the lock pin, a reverse unlocking oil cavity is formed between the lock pin and the rotor, the reverse unlocking stress surface is positioned in the reverse unlocking oil cavity, and a lock pin reverse unlocking oil passage is formed by the communication among the reverse unlocking oil cavity, the rotor oil groove, the chain wheel oil groove and the delay cavity.

Preferably, the spring cover further comprises a spring seat, the spring seat is fixedly connected with the cover plate, and a lock pin spring is arranged between the spring seat and the lock pin.

Preferably, the spring seat is in a T-shaped cross section, and a relatively smaller end of the spring seat and one end of the locking pin spring form a sleeving structure.

Preferably, the rotor is provided with an exhaust hole, a lock pin stroke cavity is formed between the cover plate and the lock pin, and the exhaust hole is communicated with the lock pin stroke cavity.

Preferably, the cover plate is fixedly connected with the positioning pin, and the positioning pin is connected with one end of the return spring.

Preferably, the other end of the return spring is connected with the rotor positioning sleeve, one end of the rotor positioning sleeve is fixedly connected with the rotor, and a clearance fit structure is formed between the other end of the rotor positioning sleeve and the cover plate.

Preferably, a fixed connection structure is formed between one end of the rotor positioning sleeve and the rotor in an interference fit mode.

Preferably, the return spring is a flat spiral spring.

Preferably, the rotor oil groove on the rotor is a T-shaped structural groove.

Compared with the prior art, the beneficial effects of the utility model are that: in the working process of the camshaft phaser, because oil pressure exists in the advance cavity and the retard cavity, engine oil output by the advance cavity enters the normal unlocking oil cavity along the normal unlocking oil passage and acts on the end part of the lock pin through the oil pressure to realize quick lifting and unlocking of the lock pin, engine oil output by the retard cavity enters the reverse unlocking oil cavity along the reverse unlocking oil passage, and the oil pressure of the engine oil acts on a reverse unlocking stress surface in the reverse unlocking oil cavity to realize the purpose of lifting and unlocking the lock pin. Therefore, the utility model discloses can prevent lockpin unblock difficulty or unblock effectively, simultaneously, also make to reduce frictional contact between the lockpin mounting hole on lockpin and the rotor, be favorable to alleviateing and avoid even leading to part abnormal wear because of frictional contact between lockpin and the rotor.

Drawings

Fig. 1 is a side view of a camshaft phaser.

Fig. 2 is a front view of a camshaft phaser.

Fig. 3 is a front view of a locking structure of a camshaft phaser of the present invention.

Fig. 4 is a cross-sectional view (a-a view in fig. 2) of a locking structure of a camshaft phaser of the present invention.

Fig. 5 is a partially enlarged view of B in fig. 4.

Part label name in the figure: 1-chain wheel, 2-shell, 3-return spring, 4-rotor positioning sleeve, 5-positioning pin, 6-cover plate, 7-rotor, 8-exhaust hole, 9-lagging cavity, 10-rotor oil groove, 11-chain wheel oil groove, 12-advance cavity, 13-normal unlocking oil cavity, 14-lock pin, 15-reverse unlocking oil cavity, 16-spring seat, 17-lock pin spring, 18-reverse unlocking stress surface and 19-lock pin stroke cavity.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The camshaft phaser shown in fig. 1, 2 and 3 mainly comprises a chain wheel 1, a shell 2, a return spring 3, a rotor positioning sleeve 4, a cover plate 6 and a rotor 7, wherein a locking structure further comprises a lock pin 14. The chain wheel 1 is fixedly connected with the shell 2, the cover plate 6 is fixedly connected with the positioning pin 5, and the positioning pin 5 is connected with one end of the reset spring 3; the other end of the reset spring 3 is connected with the rotor positioning sleeve 4, one end of the rotor positioning sleeve 4 is fixedly connected with the rotor 7, and a clearance fit structure is formed between the other end of the rotor positioning sleeve and the cover plate 6. Usually, a fixed connection structure is formed between one end of the rotor positioning sleeve 4 and the rotor 7 in an interference fit manner, and the return spring 3 is preferably a flat spiral spring.

As shown in fig. 3, 4 and 5, lock pin mounting holes are respectively formed on the sprocket 1 and the rotor 7, a lock pin 14 is mounted in the lock pin mounting holes, a lock pin stroke cavity 19 is formed between the lock pin 14 and the cover plate 6, a lock pin spring 17 is arranged in the lock pin stroke cavity 19, and the lock pin spring 17 is used for providing lock pin locking force. The lock pin 14 forms a clearance fit structure with a lock pin mounting hole on the chain wheel 1 and a lock pin mounting hole on the rotor 7 respectively, so that the lock pin 14 can axially slide relative to the chain wheel 1 and the rotor 7, a normal unlocking oil cavity 13 is formed between the lock pin 14 and the chain wheel 1, and a reverse unlocking oil cavity 15 is formed between the lock pin 14 and the rotor 7. The rotor 7 divides the inner cavity of the shell 2 into a back cavity 9 and an advance cavity 12 through rotor blades, a chain wheel oil groove 11 is formed on the chain wheel 1, a rotor oil groove 10 is formed on the rotor 7, and the rotor oil groove 10 preferably adopts a T-shaped structure groove; a reverse unlocking force-bearing surface 18 is formed on the lock pin 14, and the reverse unlocking force-bearing surface 18 is located in the reverse unlocking oil chamber 15. Generally, the outer circle of the lock pin 14 can be provided with a convex structure to form a reverse unlocking force bearing surface 18. The normal unlocking oil cavity 13 is communicated with the advance cavity 12, and the reverse unlocking oil cavity 15, the rotor oil groove 10, the sprocket oil groove 11 and the lag cavity 9 are communicated to form a lock pin reverse unlocking oil passage.

When the camshaft phaser is in an initial state, the electromagnetic valve is powered off, a certain oil pressure exists in the hysteresis cavity 9, and a lock pin reverse unlocking oil passage is formed by communicating the reverse unlocking oil cavity 15, the rotor oil groove 10, the sprocket oil groove 11 and the hysteresis cavity 9, so that the engine oil output by the hysteresis cavity 9 enters the reverse unlocking oil cavity 15 along the lock pin reverse unlocking oil passage, the oil pressure of the engine oil acts on a reverse unlocking stress surface 18 in the reverse unlocking oil cavity 15, the lock pin 14 is in a lifted state, the purpose of lifting and unlocking the lock pin 14 is achieved, and the rotor 7 is pressed at the initial position by the engine oil.

When the camshaft phaser carries out phase adjustment, the electromagnetic valve is electrified and switched to a normal unlocking oil passage for oil feeding. At this time, because there is oil pressure in the advance chamber 12, and the advance chamber 12 is communicated with the normal unlocking oil chamber 13 to form a normal unlocking oil passage, the engine oil output from the advance chamber 12 enters the normal unlocking oil chamber 13 along the normal unlocking oil passage, and acts on the end of the lock pin 14 through the oil pressure, so that the lock pin 14 compresses the lock pin spring 17, and the lock pin 14 is quickly lifted up to be unlocked, and further the phase adjuster of the camshaft is used for adjusting the phase.

In addition, in the working process of the camshaft phaser, due to the existence of oil pressure in the advance chamber 12 and the retard chamber 9, when oil enters the lock pin reverse unlocking oil passage, the lock pin 14 is in a lifting state through the oil pressure of the oil, so that the lock pin 14 is not in friction contact with the lock pin mounting holes on the sprocket 1 and the rotor 7 or the friction contact is reduced, the problem that the camshaft phaser cannot adjust the phase due to the collision between the lock pin 14 and the rotor 7 can be avoided, and meanwhile, abnormal abrasion caused by the friction contact of parts such as the lock pin 14, the rotor 7 and the sprocket 1 can be reduced or even avoided. The rotor 7 can be provided with an exhaust hole 8, and the exhaust hole 8 is communicated with the lock pin stroke cavity 19, so that oil and gas in the lock pin stroke cavity 19 can be timely exhausted through the exhaust hole 8 in the lock pin unlocking process, and the motion sensitivity of the lock pin 14 and the rotor 7 is ensured.

As shown in fig. 4 and 5, a spring seat 16 may be additionally disposed between the lock pin 14 and the cover plate 6, the spring seat 16 is fixedly connected with the cover plate 6, and a lock pin spring 17 is disposed between the spring seat 16 and the lock pin 14. Generally, the cross section of the spring seat 16 is in a T-shaped structure, and a relatively smaller end of the spring seat and one end of the lock pin spring 17 form a socket structure, so that the lock pin spring 17 can be prevented from moving and shifting in the working process of the camshaft phaser on one hand, and the lock pin spring 17 can be prevented from wearing the cover plate 6 on the other hand.

The above description is only exemplary of the present invention and should not be taken as limiting, and all changes, equivalents, and improvements made within the spirit and principles of the present invention should be understood as being included in the scope of the present invention.

Claims

1. A locking structure of a camshaft phaser comprises a chain wheel (1), a shell (2), a rotor (7) and a lock pin (14), wherein the rotor (7) divides an inner cavity of the shell (2) into a retarding cavity (9) and an advancing cavity (12) through a rotor blade, a normal unlocking oil cavity (13) is formed between the lock pin (14) and the chain wheel (1), and the normal unlocking oil cavity (13) is communicated with the advancing cavity (12), and the camshaft phaser is characterized in that: the chain wheel (1) is provided with a chain wheel oil groove (11), the rotor (7) is provided with a rotor oil groove (10), the lock pin (14) is provided with a reverse unlocking stress surface (18), a reverse unlocking oil cavity (15) is formed between the lock pin (14) and the rotor (7), the reverse unlocking stress surface (18) is positioned in the reverse unlocking oil cavity (15), and the reverse unlocking oil cavity (15), the rotor oil groove (10), the chain wheel oil groove (11) and the hysteresis cavity (9) are communicated to form a lock pin reverse unlocking oil channel.

2. A locking structure of a camshaft phaser as set forth in claim 1, wherein: the novel anti-theft door lock further comprises a spring seat (16), the spring seat (16) is fixedly connected with the cover plate (6), and a lock pin spring (17) is arranged between the spring seat (16) and the lock pin (14).

3. A locking structure of a camshaft phaser as set forth in claim 2, wherein: the section of the spring seat (16) is in a T-shaped structure, and the relatively smaller end of the spring seat and one end of the lock pin spring (17) form a sleeving structure.

4. A locking structure of a camshaft phaser as set forth in claim 2, wherein: the rotor (7) is provided with an exhaust hole (8), a lock pin stroke cavity (19) is formed between the cover plate (6) and the lock pin (14), and the exhaust hole (8) is communicated with the lock pin stroke cavity (19).

5. A locking structure of a camshaft phaser as set forth in claim 2, wherein: the cover plate (6) is fixedly connected with the positioning pin (5), and the positioning pin (5) is connected with one end of the reset spring (3).

6. A locking structure of a camshaft phaser as set forth in claim 5, wherein: the other end of the reset spring (3) is connected with the rotor positioning sleeve (4), and one end of the rotor positioning sleeve (4) is fixedly connected with the rotor (7), and a clearance fit structure is formed between the other end of the rotor positioning sleeve and the cover plate (6).

7. A locking structure of a camshaft phaser as set forth in claim 6, wherein: one end of the rotor positioning sleeve (4) and the rotor (7) form a fixed connection structure in an interference fit mode.

8. A locking structure of a camshaft phaser as set forth in claim 5, wherein: the reset spring (3) is a flat spiral spring.

9. A locking structure of a camshaft phaser as set forth in any one of claims 1-8, wherein: and a rotor oil groove (10) on the rotor (7) is a T-shaped structural groove.