CN106286527B

CN106286527B - High-power engine transmission chain pin shaft and method for assembling chain

Info

Publication number: CN106286527B
Application number: CN201610870372.9A
Authority: CN
Inventors: 刘毅; 付振明; 李存志; 金玉谟
Original assignee: Qingdao Choho Industrial Co Ltd
Current assignee: Qingdao Choho Industrial Co Ltd
Priority date: 2016-10-07
Filing date: 2016-10-07
Publication date: 2023-12-01
Anticipated expiration: 2036-10-07
Also published as: CN106286527A

Abstract

The invention relates to a high-power engine transmission chain pin shaft and a method for assembling a chain. When the chain is assembled, the conical die is pressed into the expanding central hole to expand and deform the head end of the pin shaft, and the expanded head end and the shoulder of the pin shaft realize accurate positioning of the chain plate, so that the pin shaft is effectively prevented from moving in the chain plate hole. The connecting mode is 50% -150% larger than the traditional four-corner riveting force, the weight of the pin shaft is reduced by 5% -10%, and the interference magnitude of the pin shaft and the chain plate hole is uniformly distributed along the circumferential direction.

Description

High-power engine transmission chain pin shaft and method for assembling chain

Technical Field

The invention relates to an engine accessory, in particular to a high-power engine transmission chain pin shaft and a method for assembling a chain.

Background

The chain often produces side mill and collision with the teeth of a cogwheel in the use, has the danger that makes the link joint drag rivet the frame under the axial force. Therefore, the chain riveting must be firm.

Two-corner riveting and four-corner riveting are common in the engine chain industry. The axial positioning of the traditional rivet head mode is not firm, the impact load on a high-power engine is large, the pin shaft is easy to generate fretting wear in the link plate hole, and after long-time working, the pin shaft can obviously rotate relative to the link plate. In this state, the chain plate shears and wears the pin shaft, and the connection strength is reduced, thereby affecting the service life of the chain. The two-angle riveting or the four-angle riveting is the regional expansion of the pin head end, so that the contact force between the link plate hole and the pin is unevenly distributed along the circumferential direction, local stress concentration occurs, and the fatigue performance of the link plate is affected.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a pin shaft connection mode of a high-power engine transmission chain, which improves the fastening strength of a pin shaft, reduces stress concentration, prolongs the service life of the chain and reduces the weight of the chain.

Theoretical analysis and experiments prove that the pin shaft is in interference fit with the chain plate hole, and the fastening strength is adjusted by controlling the interference. The traditional connection mode of the engine transmission chain pin shaft is double-angle riveting or four-angle riveting, and the interference magnitude is different along the circumferential direction of the chain plate hole, so that stress concentration is easy to occur, and the fatigue life of the chain plate is influenced. In the traditional connection mode, the chain plate is not reliably positioned axially on the pin shaft, when the axial force borne by the pin shaft is larger than the fastening force under the condition of heavy load use, the pin shaft can axially move, drag riveting is easy to occur, and chain frame scattering is caused.

Aiming at the situation, the invention provides a pin shaft connection mode of a transmission chain of a high-power engine. The diameter of the two ends of the pin shaft is smaller than that of the middle part, the diameters of the two ends are 80% -90% of that of the middle part, and the height of the small-diameter part of the head end is 155% -185% of the thickness of the matched chain plate. The end face of the pin shaft head is provided with a swelling central hole, the aperture of the pin shaft end is 20% -40% of the outer diameter of the head end, and the depth of the pin shaft end hole is 85% -110% of the thickness of the link plate matched with the pin shaft end hole.

The assembly method comprises the following steps: the pin shaft is inserted into the link plate hole, and the pin shaft shoulder is attached to the link plate. The conical die is pressed into the hole at the end part of the pin shaft, the hole is expanded and everted, and the everted part is flattened.

The pin shaft connecting mode firmly fixes the pin shaft and the chain plate together through the deformation of the head end of the pin shaft, the interference magnitude of the pin shaft shoulder and the pin shaft and the hole, and effectively prevents the pin shaft from moving in the hole of the chain plate. The interference magnitude of the pin shaft and the link plate hole in the connecting mode is uniformly distributed along the circumferential direction, so that stress concentration is effectively avoided. The connecting mode is 50% -150% greater than the traditional four-corner riveting fastening strength. Meanwhile, the weight of the pin shaft is reduced by 5% -10% due to the change of the structure of the pin shaft.

Drawings

FIG. 1 is a pin block diagram;

fig. 2 is a front view of the pin shaft.

Detailed Description

The invention is described in further detail below with reference to the attached drawings and examples:

the pin shaft in the pin shaft connection mode of the high-power engine transmission chain comprises a pin shaft main body 1, a pin shaft head end 2 and a pin shaft hole 3. The main technical characteristics are that the diameter of the pin head end 1 is 85% of the diameter of the pin main body 1, the height of the small diameter part of the pin head end 2 is 160% of the thickness of a link plate matched with the small diameter part, the aperture of the pin hole 3 is 30% of the outer diameter of the head end, and the depth of the pin head 3 is 100% of the thickness of the link plate matched with the small diameter part.

The pin shaft connecting mode firmly fixes the pin shaft and the chain plate together through the deformation of the head end of the pin shaft, the interference magnitude of the pin shaft shoulder and the pin shaft and the hole, and effectively prevents the pin shaft from moving in the hole of the chain plate. The interference magnitude of the pin shaft and the link plate hole in the connecting mode is uniformly distributed along the circumferential direction, so that stress concentration is effectively avoided. The connecting mode is 123% greater than the traditional four-corner riveting fastening strength. Meanwhile, the weight of the pin shaft is reduced by 6% due to the change of the structure of the pin shaft.

Example 2

The diameters of the two ends of the pin shaft are smaller than the diameter of the middle part, and the end surfaces of the two ends of the pin shaft are provided with expansion center holes. The diameters of the two ends are 83% of the diameter of the middle part. The height of the small diameter part of the enlarged central hole is 172% of the thickness of the matched chain plate. The diameter of the enlarged central hole is 25% of the outer diameter of the two ends. The depth of the enlarged central hole is 98% of the thickness of the matched chain plate. The connecting mode is 132% higher than the traditional four-corner riveting fastening strength. Meanwhile, the weight of the pin shaft is reduced by 8% due to the change of the structure of the pin shaft.

Example 3

The diameters of the two ends of the pin shaft are smaller than the diameter of the middle part, and the end surfaces of the two ends of the pin shaft are provided with expansion center holes. The diameters of the two ends are 87% of the diameter of the middle part. The height of the small diameter part of the enlarged central hole is 175 percent of the thickness of the matched chain plate. The diameter of the enlarged central hole is 35% of the outer diameter of the two ends. The depth of the enlarged central hole is 100% of the thickness of the matched chain plate. The connecting mode is 142% stronger than the traditional four-corner riveting fastening strength. Meanwhile, the weight of the pin shaft is reduced by 5.5% due to the change of the structure of the pin shaft.

Claims

1. The utility model provides a high-power engine drive chain round pin axle which characterized in that: the diameters of the two ends of the pin shaft are smaller than the diameter of the middle part, and the end surfaces of the two ends of the pin shaft are provided with expansion center holes;

the diameters of the two ends are 80% -90% of the diameter of the middle part;

the height of the small diameter part of the enlarged central hole is 155-185% of the thickness of the matched chain plate;

the diameter of the enlarged central hole is 20% -40% of the outer diameter of the two ends;

the depth of the enlarged central hole is 85% -110% of the thickness of the matched chain plate;

the pin shaft is inserted into the link plate hole, the pin shaft shoulder is attached to the link plate, the conical die is pressed into the expanding central hole at the end part of the pin shaft, the hole is expanded and everted, and the everting part is flattened;

the pin shaft and the chain plate are firmly fixed together through deformation of the head end of the pin shaft, the shaft shoulder of the pin shaft and the interference magnitude of the pin shaft and the hole, so that the pin shaft is prevented from moving in the hole of the chain plate, the interference magnitude of the pin shaft and the hole of the chain plate is uniformly distributed along the circumferential direction, and stress concentration is effectively avoided.

2. A high power engine drive chain pin as defined in claim 1, wherein: before assembly, the pin shaft is subjected to end annealing.