Anti-fretting-fatigue press-fitting axle of motor train unit

Abstract

The utility model discloses an anti-fretting fatigue motor train unit press-fitting axle which comprises an axle, a wheel is arranged on one side of the axle, a through hole is formed in the middle of the wheel, fan-shaped limiting grooves are formed in the upper side and the lower side of the through hole respectively, and the axle is integrally provided with limiting blocks matched with the through hole and the fan-shaped limiting grooves. The axle is inserted into the through holes of the wheels and the fan-shaped limiting grooves through the limiting blocks to achieve insertion connection. The utility model relates to the technical field of axles, an axle and a wheel are connected in an inserting mode, a first end cover and a second end cover are respectively added on two sides of the wheel, so that the connection stability between the axle and the wheel is improved, and a positioning column, a limiting O-shaped ring, an abutting block and a blocking ring are respectively added. Therefore, tiny relative sliding between the wheel and the axle is reduced, and the purposes of resisting fretting fatigue and prolonging the service life of the axle are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel axles, in particular to a motor vehicle unit press-fitted wheel axle which is resistant to fretting fatigue. Background Art

[0002] During the operation of the EMU, a slight relative sliding will occur between the wheels and the axles. The amplitude of this sliding is usually very small, but long-term action will lead to micro-motion fatigue problems, which can easily cause cracks, wear and other damages at the edges of the wheel-axle mating parts, thereby affecting the service life and safety of the wheel-axle. Utility Model Content

[0003] The utility model aims to provide a motor vehicle unit press-fitted wheel axle which is resistant to micro-motion fatigue, and can improve the service life and safety of the wheel axle through structural improvement.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions: a press-fit wheel axle of an EMU with anti-fretting fatigue, comprising an axle, a wheel is arranged on one side of the axle, a through hole is arranged in the middle part of the wheel, fan-shaped limit grooves are opened on both the upper and lower sides of the through hole, a limit block matching the through hole and the fan-shaped limit groove is arranged on the axle, and the axle is inserted into the through hole and the fan-shaped limit groove of the wheel through the limit block to achieve plug-in connection;

[0005] The wheel is provided with a first end cover groove and a second end cover groove at both inner and outer sides, respectively. The first end cover groove is connected to the first end cover by bolts, and the second end cover groove is connected to the second end cover by bolts.

[0006] Preferably, a positioning column is fixedly provided inside the fan-shaped limiting groove, and the positioning column is a hexagonal column.

[0007] Preferably, a positioning groove matching the positioning column is formed on the end surface of the limiting block.

[0008] Preferably, a limiting O-ring is disposed on the inner side of the second end cover and is in close contact with the limiting block.

[0009] Preferably, the positioning column is integrally arranged on the stop block, and the stop block is press-fitted into the fan-shaped limiting groove of the wheel.

[0010] Preferably, a blocking ring is provided at the joint between the first end cover and the axle, and the blocking ring is designed to be truncated cone-shaped.

[0011] The utility model has the following beneficial effects: in the technical scheme, the axle and the wheel are connected by plugging, and a first end cover and a second end cover are respectively added on both sides of the wheel, so as to increase the connection stability between the axle and the wheel, and further add positioning columns, limiting O-rings, blocks and blocking rings, so as to reduce the slight relative sliding between the wheel and the axle, thereby achieving the purpose of resisting micro-motion fatigue and increasing the service life of the axle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the front view of the utility model.

[0013] Figure 2 It is a side view of the utility model.

[0014] Figure 3 It is a schematic diagram of the three-dimensional structure of the limit block of the utility model.

[0015] In the figure: 1, axle, 2, wheel, 3, limit block, 4, first end cover, 5, second end cover, 6, positioning column, 7, positioning groove, 8, limit O-ring, 9, stop block, 10, blocking ring. DETAILED DESCRIPTION

[0016] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0017] like Figure 1-3 As shown, a fretting fatigue-resistant EMU press-fitted axle comprises an axle 1, a wheel 2 is arranged on one side of the axle 1, a through hole is arranged in the middle part of the wheel 2, fan-shaped limit grooves are opened on the upper and lower sides of the through hole, and a limit block 3 matching the through hole and the fan-shaped limit groove is integrally arranged on the axle 1, and the axle 1 is inserted into the through hole and the fan-shaped limit groove of the wheel 2 through the limit block 3 for plug-in connection.

[0018] A first end cover groove is formed on the outer side of the wheel 2, and a second end cover groove is formed on the inner side thereof. The first end cover groove is connected to the first end cover 4 by bolts, and the second end cover groove is connected to the second end cover 5 by bolts.

[0019] A positioning column 6 is fixedly arranged inside the sector-shaped limiting groove, and the positioning column 6 is a hexagonal column. A positioning groove 7 matching the positioning column 6 is opened on the end surface of the limiting block 3.

[0020] Furthermore, a limiting O-ring 8 is provided on the inner side of the second end cover 5 and is in close contact with the limiting block 3 .

[0021] The positioning column 6 is integrally arranged on the stop block 9 , and the stop block 9 is press-fitted into the fan-shaped limiting groove of the wheel 2 .

[0022] A blocking ring 10 is provided at the plug-in connection between the first end cover 4 and the axle 1 , and the blocking ring 10 is designed to be in a truncated cone shape.

[0023] It should be noted that when assembling the wheel 2 and the axle 1, the stopper 9 is first pressed into the fan-shaped limit groove of the wheel 2, the two sides of the limit block 3 are aligned with the fan-shaped limit groove, and the limit block 3 is inserted into the through hole of the wheel 2 through the fan-shaped limit groove. At this time, the positioning column 6 is plugged into the positioning groove 7, and the stopper 9 is tightly attached to the limit block 3, so that the position of the limit block 3 can be limited;

[0024] After the plugging is completed, the second end cover 5 is placed inside the second end cover groove, and the second end cover 5 is connected to the inner side of the wheel 2 by bolts. At this time, the limiting O-ring 8 will be tightly attached to the limiting block 3, and the stop block 9 can further increase the tightness of the connection between the wheel 2 and the limiting block 3 on the axle 1, thereby reducing the relative sliding between the wheel 2 and the axle 1, and further reducing the occurrence of micro-motion fatigue;

[0025] Then, the first end cover 4 is placed inside the first end cover groove, and the first end cover 4 is fixed to the other side of the wheel 2 by bolts. At the same time, a blocking ring 10 is provided at the joint between the first end cover 4 and the axle 1. The blocking ring 10 is set in a truncated cone shape. During the operation of the EMU, small stones are easy to enter the connection between the wheel 2 and the axle 1, causing wear of the connection between the wheel 2 and the axle 1. The blocking ring 10 can block the stones and further increase the service life of the wheel axle.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A press-fit wheel axle for a train set that resists fretting fatigue, comprising an axle, a wheel is arranged on one side of the axle, a through hole is arranged in the middle part of the wheel, and the characteristics are: The through hole is provided with fan-shaped limit grooves on both the upper and lower sides, and the axle is provided with a limit block matching the through hole and the fan-shaped limit groove, and the axle is inserted into the through hole and the fan-shaped limit groove of the wheel through the limit block to achieve plug-in connection; The wheel is provided with a first end cover groove and a second end cover groove at both inner and outer sides, respectively. The first end cover groove is connected to the first end cover by bolts, and the second end cover groove is connected to the second end cover by bolts.

2. The anti-fretting fatigue EMU press-fit wheel axle according to claim 1 is characterized in that: A positioning column is fixedly arranged inside the fan-shaped limiting groove, and the positioning column is a hexagonal column.

3. The anti-fretting fatigue EMU press-fit wheel axle according to claim 2 is characterized in that: The end surface of the limit block is provided with a positioning groove matching the positioning column.

4. The anti-fretting fatigue EMU press-fit wheel axle according to claim 3 is characterized in that: A limiting O-ring is arranged on the inner side of the second end cover and is in close contact with the limiting block.

5. The anti-fretting fatigue EMU press-fit wheel axle according to claim 4 is characterized in that: The positioning column is integrally arranged on the stop block, and the stop block is pressed into the fan-shaped limiting groove of the wheel.

6. The anti-fretting fatigue EMU press-fit wheel axle according to claim 5 is characterized in that: A blocking ring is provided at the joint between the first end cover and the axle, and the blocking ring is in a truncated cone shape.

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