WO2022151548A1

WO2022151548A1 - Wear-resistant crankshaft structure

Info

Publication number: WO2022151548A1
Application number: PCT/CN2021/075489
Authority: WO
Inventors: 李成志; 潘祥; 应杰; 许一齐; 赵崇碧; 师文广; 张红娟; 胡品容
Original assignee: 宁波斯达弗液压传动有限公司
Priority date: 2021-01-18
Filing date: 2021-02-05
Publication date: 2022-07-21
Also published as: CN215110036U

Abstract

A wear-resistant crankshaft structure, comprising a shaft sleeve (1), a crankshaft body (2), and a plurality of cylindrical roller groups. The crankshaft body (2) comprises an eccentric section (21); the shaft sleeve (1) is fitted over the eccentric section (21); the plurality of cylindrical roller groups are mounted between the shaft sleeve (1) and the eccentric section (21); a gasket (4) is arranged between every two adjacent cylindrical roller groups; the gasket (4) is fitted over the eccentric section (21). The wear-resistant crankshaft structure can effectively avoid wear between end faces of cylindrical rollers, and prolong the service life.

Description

A wear-resistant crankshaft structure

technical field

The invention relates to a crankshaft structure, in particular to a wear-resistant crankshaft structure.

Background technique

Crankshaft connecting rod hydraulic motor is a hydraulic actuator that converts hydraulic energy into mechanical energy and outputs rotary motion. It is composed of bearings, in which the crankshaft structure plays an extremely important role. Generally speaking, the crankshaft structure consists of a shaft sleeve, a crankshaft body and cylindrical rollers. A spacer ring is fixed circumferentially in the middle of the shaft sleeve, and the shaft sleeve is sleeved on the crankshaft body. On the top, multiple sets of cylindrical rollers are arranged between the shaft sleeve and the crankshaft body,

When the hydraulic system runs for a long time, if the hydraulic oil is not replaced within the specified time, the cleanliness of the oil at this time is poor, and there are many internal impurities. The extrusion wear and skin peeling between the two will directly affect the service life of the motor. In severe cases, the cylindrical roller will be directly stuck, resulting in damage to the crankshaft body and the shaft sleeve, resulting in motor failure.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a wear-resistant crankshaft structure, which can effectively avoid the wear between the end faces of the cylindrical rollers and prolong the service life.

The technical solution adopted by the present invention to solve the above technical problems is: a wear-resistant crankshaft structure, comprising a shaft sleeve, a crankshaft body and a plurality of sets of cylindrical roller groups, the crankshaft body includes an eccentric section, and the shaft sleeve sleeve Set on the eccentric section, multiple groups of the cylindrical roller groups are installed between the shaft sleeve and the eccentric section, and a washer is arranged between the adjacent cylindrical roller groups, so The washer is sleeved on the eccentric section.

The number of the cylindrical roller groups is four, from front to back are the first cylindrical roller group, the second cylindrical roller group, the third cylindrical roller group and the fourth cylindrical roller group. A spacer ring is fixed circumferentially on the inner side wall of the middle part of the shaft sleeve, the first cylindrical roller group and the second cylindrical roller group are located on one side of the spacer ring, and the third cylindrical roller group is located on one side of the spacer ring. The subgroup and the fourth cylindrical roller group are located on the other side of the spacer ring, between the first cylindrical roller group and the second cylindrical roller group and the third cylindrical roller group The washers are respectively arranged between the cylindrical roller group and the fourth cylindrical roller group. In this structure, the number of cylindrical roller sets is four, the first cylindrical roller set and the second cylindrical roller set are located on one side of the spacer ring, the third cylindrical roller set and the fourth cylindrical roller set Located on the other side of the spacer ring, the spacer supports the second and third cylindrical roller sets for ease of assembly and also prevents the second and third cylindrical roller sets The end face contact of the second cylindrical roller group and the third cylindrical roller group protects the second cylindrical roller group from wear and tear. The washer is arranged between the first cylindrical roller group and the second cylindrical roller group and the third cylindrical roller group. group and the fourth cylindrical roller group to avoid end face wear between them.

The hardness of the washer is smaller than the hardness of the cylindrical roller group. The advantage is to reduce the end face wear when the cylindrical roller set is in contact with the washer, and to protect the cylindrical roller set.

A gap for oil flow is left between the washer and the eccentric section. In this structure, there is a gap between the washer and the eccentric section, which can facilitate the passage of oil, so that the cylindrical roller is cooled and lubricated to ensure the smooth operation of the cylindrical roller.

The end face of the eccentric section is provided with a plurality of flow channel holes that pass through the front and rear, the side wall of the eccentric section is provided with side holes that communicate with the corresponding flow channel holes, and the flow channel holes A channel for oil flow is formed between the side hole and the side hole. The arrangement of the runner holes and the side holes reduces the weight of the entire crankshaft structure and can reduce the rotational inertia of the crankshaft structure during the operation of the motor; the runner holes are connected with the side holes, and a channel for oil flow is formed between them. , During the operation of the motor, the oil can be introduced into the crankshaft structure. On the one hand, the cylindrical roller can be cooled and lubricated to ensure the smooth operation of the cylindrical roller. On the other hand, the impurity particles inside the crankshaft structure can be taken out. , with the oil flowing back to the oil tank at the motor drain port for filtering, avoiding the extrusion wear between the cylindrical rollers, thereby extending the service life.

The side wall of the eccentric section is provided with a groove in the circumferential direction, the position of the groove corresponds to the position of the spacer ring, and the side hole is opened in the groove. In this structure, limited by the position of the spacer ring, the cylindrical rollers are evenly distributed on both sides of the spacer ring, and the grooves are arranged so that there are more gaps between the spacer ring and the side wall of the eccentric section, and the oil flows from the flow channel. After the hole enters, it flows out from the side hole to the outside of the groove, and the impurity particles inside the crankshaft structure are brought out, and the oil flows back to the oil tank at the motor drain port for filtering, avoiding the extrusion wear between the cylindrical rollers and increasing the use of life.

The crankshaft body further includes an output shaft section, a front bearing section and a rear bearing section, the output shaft section, the front bearing section, the eccentric section and the rear bearing section are connected and fixed in sequence, and The axes of the output shaft segment, the front bearing segment and the rear bearing segment are on the same line, and the eccentric segment and the axis of the front bearing segment are not on the same line.

The front and rear ends of the eccentric section are respectively coaxially extended and fixed with a first limit ring and a second limit ring, and a first gap is formed between the first limit ring and the shaft sleeve , a second gap is formed between the second limit ring and the shaft sleeve, the end face of the first cylindrical roller group is in contact with the end face of the first limit ring, the The end face of the fourth cylindrical roller group is in contact with the end face of the second limiting ring. In this structure, the arrangement of the first limiting ring and the second limiting ring serves to limit the axial movement of the first cylindrical roller group and the fourth cylindrical roller group, thereby ensuring the normal operation of the crankshaft structure.

Compared with the prior art, the present invention has the advantages that the arrangement of the washers separates multiple groups of cylindrical roller groups, so that the end face wear between adjacent cylindrical roller groups can be avoided, and the service life of the cylindrical roller groups can be prolonged. , At the same time, due to the existence of the washer, the cylindrical roller string will not occur between the adjacent cylindrical roller groups, which can avoid the adjacent cylindrical roller groups caused by the machining error of the cylindrical roller group (when the length is inconsistent). The stuck situation greatly improves the stability during operation. In addition, the cylindrical roller set can be changed from full to one less, so that the cylindrical roller will not fall to the next row, which is convenient for assembly and also The extrusion wear between the cylindrical rollers and the cylindrical rollers between each group of cylindrical rollers can be effectively avoided under the stress state; the invention can effectively avoid the wear between the end faces of the cylindrical rollers and prolong the service life.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is the side view of the present invention;

3 is a cross-sectional view of the present invention;

FIG. 4 is a schematic three-dimensional structure diagram of the crankshaft body in the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments of the accompanying drawings.

Embodiment 1: As shown in the figure, a wear-resistant crankshaft structure includes a shaft sleeve 1, a crankshaft body 2 and multiple groups of cylindrical rollers. The crankshaft body 2 includes an eccentric section 21, and the shaft sleeve 1 is sleeved on the eccentric section. 21 , multiple sets of cylindrical rollers are installed between the shaft sleeve 1 and the eccentric section 21 , a washer 4 is arranged between adjacent cylindrical roller sets, and the washer 4 is sleeved on the eccentric section 21 .

Embodiment 2: As shown in the figure, other structures are the same as Embodiment 1. The difference is that the number of cylindrical roller groups is four, and from front to back are the first cylindrical roller group 31 and the second cylindrical roller group. The roller group 32, the third cylindrical roller group 33 and the fourth cylindrical roller group 34, the inner side wall of the middle part of the shaft sleeve 1 is fixed with the spacer ring 11 in the circumferential direction, the first cylindrical roller group 31 and the second cylindrical roller group 31. The group 32 is located on one side of the spacer ring 11, the third cylindrical roller group 33 and the fourth cylindrical roller group 34 are located on the other side of the spacer ring 11, and the first cylindrical roller group 31 and the second cylindrical roller group 32 are located on the other side. Washers 4 are respectively provided between the third cylindrical roller group 33 and the fourth cylindrical roller group 34 . In this structure, the number of cylindrical roller sets is four, the first cylindrical roller set 31 and the second cylindrical roller set 32 are located on one side of the spacer ring 11, the third cylindrical roller set 33 and the fourth cylindrical roller set The group 34 is located on the other side of the spacer ring 11, and the spacer ring 11 plays a supporting role for the second cylindrical roller group 32 and the third cylindrical roller group 33, which is convenient for assembly, and also prevents the second cylindrical roller group 32. It is in contact with the end face of the third cylindrical roller group 33 to protect the second cylindrical roller group 32 and the third cylindrical roller group 33 and prevent wear. The washer 4 is arranged on the first cylindrical roller group 31 and the second cylindrical roller group 31. Between the cylindrical roller group 32 and the third cylindrical roller group 33 and the fourth cylindrical roller group 34, the end face wear between them is avoided.

The hardness of the washer 4 is smaller than that of the cylindrical roller set. The advantage is that the end face wear when the cylindrical roller group is in contact with the washer 4 is reduced, and the cylindrical roller group is protected.

A gap for oil flow is left between the washer 4 and the eccentric section 21 . In this structure, there is a gap between the washer 4 and the eccentric section 21, which can facilitate the passage of oil, so that the cylindrical roller is cooled and lubricated to ensure the smooth operation of the cylindrical roller.

Embodiment 3: As shown in the figure, other structures are the same as Embodiment 2. The difference is that the end face of the eccentric section 21 is provided with a plurality of flow channel holes 51 that pass through the front and rear, and the side wall of the eccentric section 21 is provided with The side hole 52 communicated with the corresponding flow channel hole 51 forms a channel for oil flow between the flow channel hole 51 and the side hole 52 . In this structure, the arrangement of the flow channel hole 51 and the side hole 52 reduces the weight of the entire crankshaft structure, which can reduce the rotational inertia of the crankshaft structure during the operation of the motor; the flow channel hole 51 and the side hole 52 are connected, and the other A channel for the flow of oil is formed between the two parts. During the operation of the motor, the oil can be led to the inside of the crankshaft structure. On the one hand, the cylindrical roller can be cooled and lubricated to ensure the smooth operation of the cylindrical roller. The impurity particles inside the crankshaft structure are brought out, and the oil flows back to the oil tank at the motor drain port for filtering, avoiding the extrusion wear between the cylindrical rollers, thereby prolonging the service life.

The side wall of the eccentric section 21 is provided with a groove 22 in the circumferential direction. In this structure, limited by the position of the spacer ring 11, the cylindrical rollers are evenly distributed on both sides of the spacer ring 11, and the setting of the groove 22 leaves more space between the spacer ring 11 and the side wall of the eccentric section 21, After the oil enters from the runner hole, it flows out from the side hole to the outside of the groove 22, and the impurity particles inside the crankshaft structure are carried out, and the oil flows back to the oil tank at the motor drain port for filtration to avoid friction between the cylindrical rollers. Squeeze wear and increase service life.

The crankshaft body 2 also includes an output shaft section 23, a front bearing section 24 and a rear bearing section 25. The output shaft section 23, the front bearing section 24, the eccentric section 21 and the rear bearing section 25 are connected and fixed in sequence, and the output shaft section 23, the front bearing section The axes of the segment 24 and the rear bearing segment 25 are on the same line, and the axes of the eccentric segment 21 and the front bearing segment 24 are not on the same line.

The front and rear ends of the eccentric section 21 are respectively coaxially extended and fixed with a first limit ring 26 and a second limit ring 27. A first gap 28 is formed between the first limit ring 26 and the shaft sleeve 1, and the second A second gap 29 is formed between the limit ring 27 and the shaft sleeve 1 , the end face of the first cylindrical roller set 31 is in contact with the end face of the first limit ring 26 , and the end face of the fourth cylindrical roller set 34 is in contact with the second The end faces of the stop ring 27 are in contact with each other. In this structure, the arrangement of the first limiting ring 26 and the second limiting ring 27 can limit the axial movement of the first cylindrical roller set 31 and the fourth cylindrical roller set 34, thereby ensuring the normal operation of the crankshaft structure. .

It is worth noting that the above descriptions are only the preferred embodiments of the present invention, and do not limit the scope of patent protection of the present invention. Technical equivalents are substituted. Therefore, all equivalent structural changes made by using the descriptions and illustrations of the present invention, or directly or indirectly applied to other related technical fields, are all included within the scope of the present invention.

Claims

A wear-resistant crankshaft structure includes a shaft sleeve, a crankshaft body and multiple sets of cylindrical rollers, the crankshaft body includes an eccentric section, the shaft sleeve is sleeved on the eccentric section, and the multiple sets of the The cylindrical roller group is installed between the shaft sleeve and the eccentric section, and is characterized in that a washer is arranged between the adjacent cylindrical roller groups, and the washer is sleeved on the on the eccentric section.
The wear-resistant crankshaft structure according to claim 1, wherein the number of the cylindrical roller groups is four, and from front to back are the first cylindrical roller group and the second cylindrical roller group. group, the third group of cylindrical rollers and the fourth group of cylindrical rollers, the inner side wall of the middle part of the bushing is fixed with a spacer ring in the circumferential direction, the first group of cylindrical rollers and the second group of cylindrical rollers The subgroup is located on one side of the spacer ring, the third cylindrical roller group and the fourth cylindrical roller group are located on the other side of the spacer ring, and the first cylindrical roller group The washers are respectively arranged between the group and the second cylindrical roller group and between the third cylindrical roller group and the fourth cylindrical roller group.
A wear-resistant crankshaft structure according to claim 1, wherein the hardness of the washer is smaller than the hardness of the cylindrical roller set.
A wear-resistant crankshaft structure according to claim 1, wherein a gap for oil flow is left between the washer and the eccentric section.
A wear-resistant crankshaft structure according to claim 2, characterized in that: the end face of the eccentric section is provided with a plurality of flow passage holes that pass through the front and rear, and the side wall of the eccentric section is provided with Corresponding to the side holes communicated with the flow channel holes, a channel for oil flow is formed between the flow channel holes and the side holes.
The wear-resistant crankshaft structure according to claim 5, wherein a groove is provided on the side wall of the eccentric section in the circumferential direction, and the position of the groove is the same as the position of the spacer ring. Correspondingly, the side holes are opened in the grooves.
A wear-resistant crankshaft structure according to claim 1, wherein the crankshaft body further comprises an output shaft section, a front bearing section and a rear bearing section, the output shaft section, the front bearing The shaft section, the eccentric section and the rear bearing section are connected and fixed in sequence, and the axes of the output shaft section, the front bearing section and the rear bearing section are on the same straight line, and the eccentric section The axis of the segment is not aligned with the axis of the front bearing segment.
A wear-resistant crankshaft structure according to claim 2, wherein the front and rear ends of the eccentric section are respectively coaxially extended and fixed with a first limit ring and a second limit ring. A first gap is formed between the first limit ring and the shaft sleeve, a second gap is formed between the second limit ring and the shaft sleeve, and the first cylindrical roller The end face of the group is in contact with the end face of the first limiting ring, and the end face of the fourth cylindrical roller group is in contact with the end face of the second limiting ring.