Needle roller thrust bearing

Abstract

A needle roller thrust bearing comprises an outer ring and an inner ring, a retainer is arranged between the outer ring and the inner ring, a plurality of containing grooves are formed in the retainer in the circumferential direction, a needle roller is arranged in each containing groove in a sleeved mode, a part of the containing grooves are combined to form a first containing area, and the other parts of the containing grooves are combined to form a second containing area. The first placing area is located on the radial outer side of the retainer compared with the second placing area, and the placing grooves located in the first placing area and the second placing area are arranged in a staggered mode in the circumferential direction of the first placing area and the second placing area. The bearing has the beneficial effects that the first placing area and the second placing area which are distributed along the radial direction of the retainer are arranged, so that longer roller pins can be divided into two rows on the premise that the radial size of the bearing is not increased, and the bearing capacity of the bearing is further improved; and as the radial length of the roller pin is reduced, the centrifugal force difference between the two ends of the single roller pin is within a controllable range, and sliding friction is not increased to influence the actual operation efficiency of the bearing.

Description

Technical Field

[0001] The utility model relates to a bearing, in particular to a thrust needle roller bearing. Background Art

[0002] EMB, or Electro-Mechanical Braking, is an advanced braking technology that combines traditional mechanical braking systems with modern electronic control technology to provide a more efficient, reliable and intelligent braking solution.

[0003] The key components of EMB are ball screw and thrust, which are used in combination. After testing, it was found that the transmission efficiency of the ball screw is above 90%, while the efficiency of the EMB assembly is around 75%. Calculations show that the thrust roller has an impact of about 15% on the efficiency of the EMB assembly.

[0004] Chinese patent document CN116867980A discloses a thrust needle roller bearing comprising: a plurality of needle rollers; a raceway ring having an annular raceway surface on which the needle rollers roll; and a retainer capable of rollingly retaining the needle rollers, wherein portions of the raceway surface other than those in contact with the needle rollers are treated with an oil-repellent treatment to form an oil-repellent film.

[0005] The above solution is a conventional thrust needle roller bearing that uses a single row of needle rollers to achieve integral bearing operation. However, this solution has the following drawbacks: To increase load capacity and save axial space, the needle rollers must be lengthened. This not only increases the radial space required for the bearing, thereby deviating from the goal of reducing bearing space; more importantly, due to the increased length of the needle rollers, the different centrifugal forces at the leading and trailing ends of the needle rollers cause sliding friction, which can significantly affect the operation of the thrust needle roller bearing. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a thrust needle roller bearing which increases the bearing load capacity without changing the bearing size.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a thrust needle roller bearing, comprising an outer ring and an inner ring, a retaining frame is arranged between the outer ring and the inner ring, a plurality of placement grooves are arranged on the retaining frame along the circumferential direction, each of the placement grooves is sleeved with a needle roller, a part of the placement grooves are combined to form a first placement area, and the other part are combined to form a second placement area, the first placement area is located radially outward on the retaining frame compared to the second placement area, the placement grooves located in the first placement area have both adjacent sides in the circumferential direction of the placement grooves are the placement grooves of the second placement area, and the placement grooves located in the second placement area have both adjacent sides in the circumferential direction of the placement grooves are the placement grooves of the first placement area.

[0008] The beneficial effects of this utility model are as follows: by providing first and second placement areas distributed radially along the retainer, the longer needle rollers can be divided into two rows without increasing the radial dimensions of the bearing, thereby improving the bearing's load-bearing capacity. Furthermore, the reduced radial length of the needle rollers keeps the centrifugal force difference at both ends of a single needle roller within a controllable range, without increasing sliding friction and affecting the bearing's actual operating efficiency. Furthermore, the circumferential staggered arrangement of adjacent placement areas and internal placement slots effectively optimizes the spatial layout, ensuring that the bearing volume is not increased by the two rows of needle rollers.

[0009] Furthermore, the first placement area is provided with a first abutment ring and a second abutment ring at its two radial ends for forming a radial limit of the needle roller, and the second placement area is provided with a third abutment ring and a fourth abutment ring at its two radial ends for forming an axial limit of the needle roller. The second abutment ring is used to form an axial limit of the needle roller in the placement groove in the second placement area, and the third abutment ring is used to form an axial limit of the needle roller in the placement groove in the first placement area.

[0010] The abutment rings arranged in the retainer's radial direction effectively limit the radial position of the needle rollers within the placement grooves. Furthermore, the second abutment ring in the first placement zone axially limits the needle rollers in the second placement zone, while the third abutment ring in the second placement zone axially limits the needle rollers in the first placement zone. This interlaced arrangement of the two placement zones further optimizes the spatial layout and reduces the impact of the two rows of needle rollers on bearing size.

[0011] Furthermore, the first abutting ring and the second abutting ring are both provided with a bearing surface fitted on the outer ring, and the third abutting ring and the fourth abutting ring are both provided with a bearing surface fitted on the inner ring.

[0012] The abutment rings are divided into two groups, one for abutment against the outer ring and the other for abutment against the inner ring. This allows the outer surface of the retainer to be used outside the needle rollers, further enhancing the bearing's load-bearing capacity without changing the needle roller dimensions. As an optimization measure, the bearing surfaces abutting the outer and inner rings can be made equal in area to prevent uneven loads on one side due to different bearing areas.

[0013] Furthermore, the second abutment ring and the third abutment ring are respectively connected to their adjacent abutment rings via vertically arranged connecting feet, and are combined with their adjacent abutment rings to form an arch structure.

[0014] The vertically arranged connecting legs can further optimize the spatial structure, so as to improve the bearing load capacity while taking into account the impact on the bearing size, so as to avoid falling into the cycle of increasing the bearing size in order to increase the bearing load capacity.

[0015] Furthermore, an arc-shaped transition is formed between the connecting leg and the adjacent abutment ring.

[0016] The load-bearing force on the bearing can be effectively dispersed at the arc-shaped transition of the connecting leg, thereby preventing stress concentration at the connecting leg and the risk of fracture. At the same time, the problem of the connecting leg being too large can be effectively avoided by setting the arc-shaped transition. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an axonometric diagram of an embodiment of the present utility model;

[0018] Figure 2 A cross-sectional view of an embodiment of the present utility model;

[0019] Figure 3 An internal view of an embodiment of the present invention;

[0020] Figure 4 This is an axonometric view of a retainer according to an embodiment of the present utility model;

[0021] Figure 5 This is a front view of a retainer according to an embodiment of the present utility model;

[0022] Figure 6 This is a partial enlarged view of the connecting foot of the utility model. DETAILED DESCRIPTION

[0023] The utility model embodiment of a thrust needle roller bearing as Figure 1-6 As shown, the cage 3 comprises an outer ring 1, an inner ring 2, and a retainer 3 disposed therebetween for accommodating needle rollers 4. The retainer 3 is provided with a first accommodating area 31 and a second accommodating area 32. The first accommodating area 31 is radially outward of the second accommodating area 32, i.e., the first accommodating area 31 is located at the radial edge of the retainer 3, while the second accommodating area 32 is located at the radial center of the retainer 3. Each accommodating area is circumferentially provided with a plurality of accommodating grooves 33. A accommodating groove 33 in the first accommodating area 31 has circumferentially adjacent accommodating grooves 33 in the second accommodating area 32 on both sides thereof, and a accommodating groove 33 in the second accommodating area 32 has circumferentially adjacent accommodating grooves 33 in the first accommodating area 31 on both sides thereof. In other words, when viewed in a cross-section of the retainer 3, the accommodating grooves 33 in the first accommodating area 31 and the second accommodating area 32 are circumferentially offset.

[0024] The placement groove 33 in the first placement area 31 is provided with a first abutment ring 311 and a second abutment ring 312 at its radial ends, respectively, to cooperate and radially limit the needle rollers 4. The placement groove 33 in the second placement area 31 is provided with a third abutment ring 321 and a fourth abutment ring 322 at its radial ends, respectively, to cooperate and radially limit the needle rollers 4. The second abutment ring 312 in the first placement area 31 is used to axially limit the needle rollers 4 in the placement groove 33 of the second placement area 32, while the third abutment ring 321 in the second placement area 32 is used to axially limit the needle rollers 4 in the placement groove 33 of the first placement area 31. Furthermore, the radial limit provided by the first and second abutment rings 311 and 312 is located axially on the side of the bearing closer to the outer ring 1, while the radial limit provided by the third and fourth abutment rings 321 and 322 is located axially on the side of the bearing closer to the inner ring 2. This arrangement ensures both rows of needle rollers 4 are both axially and radially limited within the cage 3.

[0025] The first abutment ring 311 and the second abutment ring 312 within the first placement area 31 are each provided with a first bearing surface 313 that abuts against the outer ring 1. The third abutment ring 321 and the fourth abutment ring 322 within the second placement area 31 are each provided with a second bearing surface 323 that abuts against the inner ring 2. The second abutment ring 312 and the third abutment ring 321 are each connected to their adjacent abutment rings via vertically arranged connecting legs 34. The connecting legs 34 and the adjacent abutment rings form an arched structure, with an arcuate transition 341 formed between the connecting legs 34 and the adjacent abutment rings.

[0026] During use, this embodiment forms a load on the outer ring 1 by placing the needle roller 4 in the groove 33 and through the first bearing surface 313 on the first abutment ring 311 and the second abutment ring 312; and forms a load on the inner ring 2 by placing the needle roller 4 in the groove 33 and through the second bearing surface 323 on the third abutment ring 321 and the fourth abutment ring 322. As a result, this embodiment greatly enhances the load-bearing capacity without changing the outer circumference size of the bearing.

[0027] The above embodiment is only one preferred embodiment of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A thrust needle roller bearing comprising an outer ring and an inner ring, a retainer disposed between the outer ring and the inner ring, the retainer being provided with a plurality of placement grooves circumferentially, each of the placement grooves being sleeved with a needle roller, characterized in that: A part of the placement grooves are combined to form a first placement area, and the other part are combined to form a second placement area. The first placement area is located radially outward on the retaining frame compared to the second placement area. The placement grooves located in the first placement area have both adjacent sides in the circumferential direction of the placement grooves in the second placement area, and the placement grooves located in the second placement area have both adjacent sides in the circumferential direction of the placement grooves in the first placement area.

2. The thrust needle roller bearing according to claim 1, characterized in that: The first placement area is provided with a first abutment ring and a second abutment ring at its two radial ends for forming a radial limit of the needle roller, and the second placement area is provided with a third abutment ring and a fourth abutment ring at its two radial ends for forming two ends of the radial limit of the needle roller. The second abutment ring is used to form an axial limit of the needle roller in the placement groove in the second placement area, and the third abutment ring is used to form an axial limit of the needle roller in the placement groove in the first placement area.

3. The thrust needle roller bearing according to claim 2, characterized in that: The first abutting ring and the second abutting ring are both provided with a bearing surface affixed to the outer ring, and the third abutting ring and the fourth abutting ring are both provided with a bearing surface affixed to the inner ring.

4. The thrust needle roller bearing according to claim 2, characterized in that: The second abutment ring and the third abutment ring are respectively connected to their adjacent abutment rings via vertically arranged connecting feet, and are combined with their adjacent abutment rings to form an arched structure.

5. The thrust needle roller bearing according to claim 4, characterized in that: An arc-shaped transition is formed between the connecting foot and the adjacent abutting ring.

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