Track chassis loading wheel torsion bar suspension bearing and axial loading test tool

Abstract

The utility model discloses a track chassis loading wheel torsion bar suspension bearing and an axial loading test tooling, a double conical surface and O-shaped ring combined structure is adopted between an inner ring and an outer ring of the track chassis loading wheel torsion bar suspension bearing, and the double conical surfaces apply pre-pressing to the O-shaped ring, so that the sealing under the working condition of higher fording depth is solved through the pre-pressing of the O-shaped ring, and the axial loading test of the track chassis loading wheel torsion bar suspension bearing is realized. And a certain axial load is provided through the double conical surfaces, so that the sealing requirement of the torsion bar suspension bearing of the loading wheel of the crawler chassis under the special use working condition is met.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing structure design, in particular to a crawler chassis road wheel torsion bar suspension bearing and an axial loading test tool. Background Art

[0002] When the torsion bar suspension bearing of the track chassis road wheel is working, its radial load is extremely large, while the axial load is relatively small and it needs to bear axial loads in two directions. The use of rolling ball bearings cannot meet its radial load requirements, so the use of roller bearing structure is a better solution; in addition, the working environment of the torsion bar suspension bearing of the track chassis road wheel is harsh and has extremely high requirements for sealing. It is necessary to ensure the reliability and long service life of the bearing seal under conditions of high wading depth and high water pressure. The lip seal structure commonly used in roller bearings cannot meet this requirement at high wading depth and pressure, so the sealing structure of the existing roller bearings must be improved. Utility Model Content

[0003] In order to overcome the deficiencies in the background technology, the utility model discloses a crawler chassis road wheel torsion bar suspension bearing and an axial loading test fixture, which are used to solve the problems of waterproof sealing and service life of the crawler chassis road wheel torsion bar suspension bearing under special working conditions.

[0004] A crawler chassis road wheel torsion bar suspension bearing comprises an inner ring, an outer ring and a roller. The inner ring is provided with an inner ring raceway, the outer ring is provided with an outer ring raceway, and the roller is rotatably arranged between the inner ring raceway and the outer ring raceway; a double-lip skeleton sealing ring is provided at one end of the inner ring and the outer ring, and a retaining ring A is floatingly provided at the other end; an O-ring is provided between the retaining ring A and the outer ring, and the O-ring is provided with pre-load.

[0005] Furthermore, the contact surfaces of the outer ring, the retaining ring A and the O-ring are all conical surfaces.

[0006] Furthermore, a retaining ring B is fixedly provided on the outside of the retaining ring A.

[0007] Furthermore, raceway ribs are provided on both sides of the inner ring raceway of the inner ring, and the rollers are provided between the raceway ribs.

[0008] Furthermore, the rollers are arranged in pairs, with adjacent end faces in contact with each other; adjacent pairs of rollers are isolated by roller cages.

[0009] Furthermore, the inner ring is provided with an O-ring side raceway rib, and the outer end portion is provided with a retaining ring mounting neck, which is interference fit with the inner hole of retaining ring B; a gap is provided between retaining ring A and the outer cylindrical surface of the inner ring side raceway rib.

[0010] Furthermore, the O-ring is made of hydrogenated nitrile butadiene rubber; and the double-lip skeleton sealing ring is made of fluororubber.

[0011] The invention discloses an axial loading test fixture for a track chassis road wheel torsion bar suspension bearing, which is used for loading test of the track chassis road wheel torsion bar suspension bearing after assembly, and comprises an outer ring locating seat, an inner ring loading platform, and a dial indicator, wherein both the outer ring locating seat and the inner ring loading platform are provided with locating rings; when the track chassis road wheel torsion bar suspension bearing is subjected to loading test, the tool is arranged between the outer ring locating seat and the inner ring loading platform, the outer ring is positioned on the upper end face of the outer ring locating seat by the locating ring, and the inner ring loading platform is positioned on the outer end face of the retaining ring B by the locating ring; a plurality of dial indicators are provided, which are evenly distributed between the outer ring locating seat and the inner ring loading platform around the axis of the track chassis road wheel torsion bar suspension bearing via magnetic seats.

[0012] Due to the adoption of the technical solution as described above, the utility model has the following beneficial effects: the utility model discloses a crawler chassis road wheel torsion bar suspension bearing and an axial loading test fixture, and a double-conical surface and O-ring combined sealing structure is adopted between the inner and outer rings of the crawler chassis road wheel torsion bar suspension bearing. The double-conical surface applies pre-pressure to the O-ring, which not only solves the sealing problem under high wading depth conditions through the pre-pressure of the O-ring, but also provides a certain axial load through the double-conical surface, thereby solving the sealing requirements of the crawler chassis road wheel torsion bar suspension bearing under special operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the cross-sectional structure of the torsion bar suspension bearing of the track chassis road wheel;

[0014] Figure 2 Schematic diagram of the inner ring cross-section structure;

[0015] Figure 3 Schematic diagram of the cross-sectional structure of the outer ring;

[0016] Figure 4 Schematic diagram of the cross-sectional structure of retaining ring A;

[0017] Figure 5 Schematic diagram of the cross-sectional structure of retaining ring B;

[0018] Figure 6 This is a cross-sectional diagram of the assembly structure of the track chassis road wheel torsion bar suspension bearing in use;

[0019] Figure 7 Schematic diagram of the cross-sectional structure of the axial loading test fixture.

[0020] In the figure: 1. Inner ring; 1.1. Inner ring raceway; 1.2. Raceway rib; 1.3. Retaining ring mounting neck; 2. Outer ring; 2.1. Outer ring raceway; 2.2. Outer ring O-ring mounting surface; 3. Roller; 4. Double-lip skeleton seal; 5. Retaining ring A; 5.1. Retaining ring O-ring mounting surface; 6. O-ring; 7. Retaining ring B; 8. Torsion bar suspension shaft; 9. Torsion bar; 9.1. Torsion bar spacer; 10. Spacer; 11. End baffle; 12. Outer ring locating seat; 13. Inner ring loading platform. DETAILED DESCRIPTION

[0021] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0022] The structure of the present invention is further described below in conjunction with the accompanying drawings. Figure 1-6 :

[0023] A crawler chassis road wheel torsion bar suspension bearing comprises an inner ring 1, an outer ring 2 and a roller 3, wherein the inner ring 1 is provided with an inner ring raceway 1.1, the outer ring 2 is provided with an outer ring raceway 2.1, and the roller 3 is rotatably arranged between the inner ring raceway 1.1 and the outer ring raceway 2.1; a double-lip skeleton sealing ring 4 is provided at one end of the inner ring 1 and the outer ring 2, and a retaining ring A5 is floatingly provided at the other end, an O-ring 6 is provided between the retaining ring A5 and the outer ring 2, and the O-ring 6 is provided with a pre-load; the floating design of the retaining ring A5 enables the O-ring 6 to automatically adjust its position when the pre-load is applied, thereby ensuring that the pre-load applied to the O-ring 6 is uniform; in addition, the O-ring 6 will wear during the operation of the crawler chassis road wheel torsion bar suspension bearing, and the floating design of the retaining ring A5 will make the O-ring 6 wear evenly, thereby extending the service life of the crawler chassis road wheel torsion bar suspension bearing.

[0024] Furthermore, the contact surfaces of the outer ring 2, the retaining ring A5 and the O-ring 6 are all conical surfaces. When an O-ring sealing structure is usually adopted, the O-ring adopts a radial preload method. To ensure that the O-ring is not damaged during the assembly process, the diameter and preload of the O-ring are relatively small, the preload amount is also fixed, and it cannot provide axial load, which obviously cannot meet the special operating conditions of the crawler chassis road wheel torsion bar suspension bearing. However, in this crawler chassis road wheel torsion bar suspension bearing, in order to enable the O-ring 6 to provide axial load and reliable sealing effect, the diameter of the O-ring 6 is relatively large (up to 10 mm or more), the preload amount is also large, and the preload changes with the axial load. Therefore, a double-conical contact preload sealing structure of the outer ring 2, the retaining ring A5 and the O-ring 6 is adopted. This not only solves the assembly problem of the O-ring 6 with a large diameter and large preload amount, but also can withstand the axial load and waterproof seal through the preload of the O-ring 6, thereby fully meeting the special operating conditions of the crawler chassis road wheel torsion bar suspension bearing.

[0025] Furthermore, a retaining ring B7 is fixedly provided on the outside of the retaining ring A5; the retaining ring B7 is used to fix and limit the position of the retaining ring A5 on the axis to prevent the retaining ring A5 and the O-ring 6 from falling off during transportation of the crawler chassis road wheel torsion bar suspension bearing.

[0026] Furthermore, raceway ribs 1.2 are provided on both sides of the inner ring raceway 1.1 of the inner ring 1, and the rollers 3 are provided between the raceway ribs 1.2.

[0027] Furthermore, the rollers 3 are arranged in pairs, and the adjacent end faces abut against each other. The use of rollers 3 arranged in pairs correspondingly shortens the length of each roller 3, thereby improving the contact condition between the rollers 3 and the raceway in the length direction, reducing the contact stress between the rollers 3 and the raceway, and extending the service life of the torsion bar suspension bearings of the crawler chassis road wheels; adjacent pairs of rollers 3 are isolated by roller retainers.

[0028] Furthermore, the inner ring 1 is provided with an O-ring 6 on one side of the raceway rib 1.2, and the outer end thereof is provided with a raceway mounting neck 1.3, and the raceway mounting neck 1.3 is interference fit with the inner hole of the raceway B7; a gap is provided between the outer cylindrical surface of the raceway rib 1.2 on the side of the inner ring 1 on which the O-ring 6 is provided, so that the raceway A5 is in a floating state.

[0029] Furthermore, the O-ring 6 is made of hydrogenated nitrile butadiene rubber, which has excellent properties such as high strength, high tear resistance, high wear resistance, and high heat resistance, and can fully meet the use requirements of the crawler chassis road wheel torsion bar suspension bearing; the double-lip skeleton seal ring 4 is made of fluororubber.

[0030] See the instructions attached Figure 7 :

[0031] An axial loading test fixture for a crawler chassis road wheel torsion bar suspension bearing comprises an outer ring locating seat 12, an inner ring loading platform 13, and a dial indicator, wherein both the outer ring locating seat 12 and the inner ring loading platform 13 are provided with locating rings; when the crawler chassis road wheel torsion bar suspension bearing is subjected to a loading test, the fixture is arranged between the outer ring locating seat 12 and the inner ring loading platform 13, the outer ring 2 is positioned on the upper end face of the outer ring locating seat 12 by the locating ring, and the inner ring loading platform 13 is positioned on the outer end face of the retaining ring B7 by the locating ring; a plurality of dial indicators are provided, which are evenly distributed between the outer ring locating seat 12 and the inner ring loading platform 13 around the axis of the crawler chassis road wheel torsion bar suspension bearing via a magnetic seat. Specific embodiments

[0032] See the instructions attached Figure 1 :A crawler chassis road wheel torsion bar suspension bearing, including an inner ring 1, an outer ring 2, a roller 3, a double-lip skeleton seal ring 4, a retaining ring A5, an O-ring 6, and a retaining ring B7; see the attached manual Figure 2:The inner ring 1 is a thin-walled ring with an inner ring raceway 1.1 on the outer surface. There are raceway ribs 1.2 on both sides of the inner ring raceway 1.1. Overrun grooves are provided at the roots of the inner surface of the inner ring raceway 1.1 and the raceway rib 1.2. A retaining ring mounting neck 1.3 is provided on the outer side of the left raceway rib 1.2. Figure 3 :The outer ring 2 is a thin-walled ring, and the inner surface is the outer ring raceway 2.1. The outer ring O-ring mounting surface 2.2 is provided on the left side of the outer ring raceway 2.1. The outer ring O-ring mounting surface 2.2 is a conical surface with a cone angle of 10°; the circumferential surface R5 is provided on the left side of the conical surface; see the appendix of the instruction manual Figure 4 : The retaining ring A5 is in the shape of a segmented ring, and the outer surface is provided with a retaining ring O-ring mounting surface 5.1, which is a conical surface with a cone angle of 22°; there are ribs on both sides of the conical surface, and the ribs and the retaining ring O-ring mounting surface 5.1 are transitioned through an arc angle; see the attached manual Figure 5 : The retaining ring B7 is a short circular ring;

[0033] See the instructions attached Figure 1 : The rollers 3 are arranged in pairs of two, with adjacent end faces lightly in contact, and are rotatably arranged between the inner ring raceway 1.1 and the outer ring raceway 2.1. The ends of the rollers 3 on both sides lightly in contact with the raceway rib 1.2, and the adjacent pairs of rollers 3 are isolated by roller cages; the double-lip skeleton seal ring 4 made of fluororubber is arranged on the right side of the roller 3, and the inner and outer circular surfaces of the double-lip skeleton seal ring 4 respectively in contact with the outer circular surface of the raceway rib 1.2 and the outer ring raceway 2.1; the retaining ring A5 is floatingly arranged on the outer circle of the left raceway rib 1.2, and the O-ring 6 made of hydrogenated nitrile rubber is arranged between the outer ring O-ring mounting surface 2.2 and the retaining ring O-ring mounting surface 5.1; the retaining ring B7 is fixedly arranged on the left side of the retaining ring A5, and the inner circular surface of the retaining ring B7 has an interference fit with the retaining ring mounting neck 1.3, and the retaining ring B7 in contact with the adjacent surface of the retaining ring A5.

[0034] See the instructions attached Figure 6 : When the track chassis road wheel torsion bar suspension bearings are in use, two are in a group and are arranged on the torsion bar suspension shaft 8 in a manner that the double lip skeleton sealing ring 4 is opposite to each other. A spacer ring 10 is arranged between the adjacent surfaces of the two inner rings 1, and the mounting hole of the torsion bar 9 is arranged outside the outer ring 2 of the track chassis road wheel torsion bar suspension bearing. A torsion bar spacer ring 9.1 is provided in the mounting hole of the torsion bar 9, and the torsion bar spacer ring 9.1 is arranged between the adjacent surfaces of the two outer rings 2; an end baffle 11 is fixedly provided on the left end of the torsion bar suspension shaft 8, and the inner end face of the baffle 11 conflicts with the outer end face of the baffle ring B7 of the left track chassis road wheel torsion bar suspension bearing, and the outer end face of the baffle ring B7 of the right track chassis road wheel torsion bar suspension bearing conflicts with the shaft shoulder of the torsion bar suspension shaft 8; during assembly, the thickness of the spacer ring 10 and the torsion bar spacer ring 9.1 are set to make the O-ring 6 reach the set preload value.

[0035] See the instructions attached Figure 7:An axial loading test fixture for the crawler chassis road wheel torsion bar suspension bearing, comprising an outer ring positioning seat 12, an inner ring loading platform 13, and a dial indicator, both of which are provided with positioning rings; when the crawler chassis road wheel torsion bar suspension bearing is subjected to a loading test, it is set between the outer ring positioning seat 12 and the inner ring loading platform 13, the outer ring 2 is positioned on the upper end face of the outer ring positioning seat 12 through the positioning ring, and the inner ring loading platform 13 is positioned on the outer end face of the retaining ring B7 through the positioning ring; there are four dial indicators, which are arranged around the axis of the crawler chassis road wheel torsion bar suspension bearing through a magnetic seat. Place it between the outer ring positioning seat 12 and the inner ring loading platform 13. Before the loading test, the four dial indicators are adjusted to zero. During the loading test, a loading force of 38 kg is first applied to the middle of the upper end of the inner ring loading platform 13. Then, the four dial indicator readings are read and their average value h1 is calculated. Increase the loading force in the middle of the upper end of the inner ring loading platform 13 to 185 kg, read the four dial indicator readings again, and calculate their average value h2. Calculate the difference between h1 and h2, which is the elastic deformation △h of the O-ring 6 under light and heavy load conditions. If △h is within the set range, the crawler chassis road wheel torsion bar suspension bearing is judged to be qualified.

[0036] Those skilled in the art should understand that they can implement variations by combining the prior art and the above embodiments. Such variations do not affect the essence of this solution and are not described in detail here.

[0037] It should be understood that this solution is not limited to the specific implementation methods described above. Devices and structures not described in detail should be understood to be implemented in a common manner in the art. Any person skilled in the art can, without departing from the scope of this solution, use the methods and technical content disclosed above to make many possible changes and modifications to this solution, or modify it into equivalent embodiments with equivalent changes, without affecting the essence of this solution. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this solution without departing from the content of this solution are still within the scope of protection of this solution.

[0038] The parts not described in detail in this utility model are prior art.

Claims

1. A crawler chassis road wheel torsion bar suspension bearing, comprising an inner ring, an outer ring, and a roller, wherein the inner ring is provided with an inner ring raceway, the outer ring is provided with an outer ring raceway, and the roller is rotatably disposed between the inner and outer ring raceways; wherein the roller is characterized by: A double-lip skeleton sealing ring is provided at one end of the inner ring and the outer ring, and a retaining ring A is provided floatingly at the other end. An O-ring is provided between the retaining ring A and the outer ring, and the O-ring is provided with pre-pressure.

2. The crawler chassis road wheel torsion bar suspension bearing according to claim 1, characterized in that: The contact surfaces of the outer ring, retaining ring A and O-ring are all conical surfaces.

3. The crawler chassis road wheel torsion bar suspension bearing according to claim 1, characterized in that: A retaining ring B is fixedly arranged on the outside of the retaining ring A.

4. The crawler chassis road wheel torsion bar suspension bearing according to claim 1, characterized in that: Both sides of the inner ring raceway of the inner ring are provided with raceway ribs, and the rollers are arranged between the raceway ribs.

5. The crawler chassis road wheel torsion bar suspension bearing according to claim 4, characterized in that: The rollers are arranged in pairs, with adjacent end faces in contact; adjacent pairs of rollers are isolated by roller cages.

6. The crawler chassis road wheel torsion bar suspension bearing according to claim 4, characterized in that: The inner ring is provided with an O-ring on one side of the raceway rib, and the outer end of the raceway rib is provided with a raceway mounting neck, which is interference fit with the inner hole of the raceway rib B; a gap is provided between the raceway rib A and the outer cylindrical surface of the raceway rib on the inner ring on the side of the O-ring.

7. The crawler chassis road wheel torsion bar suspension bearing according to claim 1, characterized in that: The O-ring is made of hydrogenated nitrile butadiene rubber; the double-lip skeleton sealing ring is made of fluororubber.

8. An axial loading test fixture for the crawler chassis road wheel torsion bar suspension bearing according to claim 1, characterized in that: It includes an outer ring locating seat, an inner ring loading platform, and a dial indicator. Both the outer ring locating seat and the inner ring loading platform are provided with locating rings. When the crawler chassis road wheel torsion bar suspension bearing is subjected to a loading test, it is arranged between the outer ring locating seat and the inner ring loading platform. The outer ring is positioned on the upper end face of the outer ring locating seat through the locating ring, and the inner ring loading platform is positioned on the outer end face of the retaining ring B through the locating ring. There are several dial indicators, which are evenly distributed between the outer ring locating seat and the inner ring loading platform around the axis of the crawler chassis road wheel torsion bar suspension bearing through a magnetic seat.

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