Protective tool for press fitting of bearings of motor train unit

Abstract

The utility model discloses a motor train unit bearing press fitting protection tool which comprises a protection contact part, a shaft end connecting part and a movable tray, the protection contact part is of a blocky structure, and the left end face and the right end face of the protection contact part are vertical faces capable of being attached to the pushing end of a bearing press fitting machine or the end face of a motor train unit axle. The shaft end connecting part is at least one columnar rod embedded with a porous structure at the axle end of the motor train unit, the movable tray comprises a movable base, a telescopic rod arranged on the movable base and a tray body arranged at the end of the telescopic rod, and the upper end face of the tray body can make contact with the bottom face of the protection contact part by adjusting the height and play a supporting role. The shaft end protection tool has the advantages of being easy to assemble and disassemble and improving the installation efficiency of the shaft end protection tool.

Description

Technical Field

[0001] The utility model relates to a protective tool, in particular to a press-fit protective tool for a bearing of an EMU. Background Art

[0002] The quality of bearing press-fitting is the key to ensure the safe and smooth operation of EMUs. Poor bearing press-fitting quality is one of the reasons for hot axle and axle cutting accidents in trains. The bearing press-fitting station will match the axle box bearing and use the bearing press to install the bearing on the axle neck. The bearing press-fitting protective tooling is suitable for the core link of the bearing press-fitting process, which helps to ensure and improve the quality and efficiency of bearing press-fitting. The bearing press-fitting process is to cold press the bearing onto the axle neck through the bearing press, and a large pressure is generated during the press-fitting process (NTN / NSK press-fitting force: 95-225kN; NTN / NSK final fitting force: 350-400kN). When pressing, use a matching axle end protection tooling and place it between the press and the axle section to avoid the pressure end of the press directly acting on the axle end and prevent damage to the axle end face during the press-fitting process. The axle end structure of Fuxing EMU is different from that of Harmony EMU. The axle end of Harmony EMU adopts a large thread locking structure; the axle end of Fuxing EMU adopts a multi-hole small bolt locking structure, which is equipped with a multi-hole structure with four small holes in the circumference and a large hole in the middle (see Figure 1 ). The existing shaft end protection tooling cannot meet the requirements of Fuxing EMU bearing press-fitting. Utility Model Content

[0003] In order to solve this technical problem, the utility model aims to solve the problem that in the prior art, the axle end of the "Fuxing" EMU adopts a porous small bolt locking structure. The existing axle end protection tooling cannot meet the needs of the Fuxing EMU bearing press-fitting.

[0004] The technical solution adopted by the utility model is: a kind of EMU bearing press-fitting protective tooling, including a protective contact part, an axle end connecting part and a movable tray, the protective contact part is a block structure and the left and right end faces are vertical surfaces that can fit with the push end of the bearing press or the end face of the EMU axle, and a bell mouth is also provided on the vertical surface of the protective contact part close to one end of the bearing press, and the bell mouth is just engaged with the ejector provided at the push end of the bearing press; the axle end connecting part is at least one columnar rod engaged with the porous structure of the EMU axle end, and the movable tray includes a movable base, a telescopic rod arranged on the movable base and a tray arranged at the end of the telescopic rod, and the upper end face of the tray can contact with the bottom face of the protective contact part by adjusting the height and play a supporting role.

[0005] Furthermore, the shaft end connecting portion is a single columnar rod arranged in the middle of the right end surface of the protective contact portion, and the single columnar rod can be embedded in the middle large hole of the porous structure.

[0006] Furthermore, the shaft end connecting portion is provided with four columnar rods which are evenly arranged circumferentially on the right end surface of the protective contact portion, and the four columnar rods can be embedded in four small holes in the circumferential direction of the porous structure.

[0007] Furthermore, the protective contact portion is a cylindrical structure with a hollow middle portion.

[0008] Furthermore, the protective contact portion is a cylindrical structure with a hollow middle portion and provided with a reinforcing material.

[0009] Furthermore, the base is a flatbed trolley with rollers, and the telescopic rod comprises a basic rod with a bottom fixed on the flatbed trolley and a telescopic sliding rod which is sleeved in the basic rod and can be telescoped.

[0010] Furthermore, an elastic rubber pad with holes may be sleeved on the side of the protective contact portion.

[0011] The beneficial effects and features of the utility model are:

[0012] The EMU bearing press-fitting protection tooling of the utility model uses a single columnar rod or four columnar rods to form a mounting hole support, and the lightweight design allows the tooling to be directly inserted into the porous structure of the shaft end, which is easy to install and remove, thereby improving the installation efficiency of the shaft end protection tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the installation of a preferred embodiment of the utility model (single columnar rod);

[0014] Figure 2 This is a schematic diagram of the overall structure of a preferred embodiment of the utility model (single columnar rod);

[0015] Figure 3 This is a schematic diagram of the installation structure of another preferred embodiment of the utility model (with a trolley and four columnar rods);

[0016] Figure 4 This is a schematic diagram of the overall structure of another preferred embodiment of the utility model (with reinforcement material);

[0017] Figure 5 yes Figure 4 A schematic diagram of the structure from another angle;

[0018] Figure 6 This is a schematic structural diagram of an elastic rubber pad in another preferred embodiment of the utility model;

[0019] The meanings of the accompanying numbers are as follows: 1-protective contact part, 11-reinforcement material, 12-bell mouth, 2-axial end connecting part, 3-movable tray, 31-movable base, 32-telescopic rod, 321-base rod, 322-telescopic slide rod, 33-tray, 4-EMU axle end, 41-small bolt hole, 5-bearing press, 6-position line, 7-elastic rubber pad. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings:

[0021] Please refer to Figure 1~Figure 4 , a EMU bearing press-fitting protective tooling, comprising a protective contact portion 1, an axle end connection portion 2 and a movable tray 3, the protective contact portion is a block structure and the left and right end faces are vertical surfaces that can fit with the push end of the bearing press or the end face of the EMU axle, and a bell mouth 12 is also provided on the vertical surface of the protective contact portion close to the end of the bearing press 5, and the bell mouth 12 is just engaged with the ejector 51 provided at the push end of the bearing press 5 to form a stable push structure; the axle end connection portion 2 is at least one columnar rod engaged with the porous structure 41 of the EMU axle end 4, and the movable tray 3 includes a movable base 31, a telescopic rod 32 arranged on the movable base and a tray 33 arranged at the end of the telescopic rod, and the upper end surface of the tray 33 can contact with the bottom surface of the protective contact portion 1 by adjusting the height and play a supporting role;

[0022] Please refer to Figure 2 In one embodiment, the shaft end connection part 2 is a single columnar rod arranged in the middle of the right end surface of the protective contact part, and the single columnar rod can be embedded in the middle large hole of the porous structure 41. In another embodiment, the shaft end connection part 2 can also be four columnar rods arranged evenly in the circumferential direction on the right end surface of the protective contact part, and the four columnar rods can be embedded in the four small holes in the circumferential direction of the porous structure 41; these two schemes can also be combined, with columnar rods arranged in the middle and around, or one in the middle and two on both sides.

[0023] As a modified solution, the protective contact portion is a cylindrical structure with a hollow center to reduce the weight of the structure and facilitate operation by staff.

[0024] Please refer to Figure 3 As a specific solution, the base is a flatbed trolley with rollers, and the telescopic rod includes a basic rod 321 whose bottom is fixed on the flatbed trolley and a telescopic sliding rod 322 which is sleeved in the basic rod and can be telescoped.

[0025] As a preferred solution, one or more position lines 6 can be set on the side surface of the protective contact part 1 and the upper end surface of the tray 33. When the position lines on the side surface of the protective contact part 1 and the tray 33 are aligned, it means that the protective contact part 1 is properly positioned and the axle end connection part 2 can be connected with the axle end 4 of the EMU.

[0026] Please refer to Figure 4 , Figure 5 As a variation, the protective contact portion is a cylindrical structure with a hollow middle portion and provided with a reinforcing material 11.

[0027] Please refer to Figure 6 An elastic rubber pad 7 with a hole can also be set on the side of the protective contact part 1. When there is a single columnar rod, one hole is set to match the single columnar rod; when there are four columnar rods, four holes are set to match the single columnar rod. This design allows a layer of elastic buffer to be provided between the protective contact part 1 and the EMU axle end 4, thereby better protecting the EMU axle end.

[0028] Situation and achievements:

[0029] During the installation and removal process of the tooling, only one operator is required to align the porous structure 41 (the installation hole of the plastic screw plug at the shaft end) to insert or pull out (a flatbed trolley is used for auxiliary support and positioning when necessary). It takes about 3-10 seconds to press-fit the protective tooling for the bearing of a wheelset, which greatly improves the efficiency of the bearing press-fit protective tooling.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the description only illustrate the structural relationship and principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A press-fitting protective tool for EMU bearings, characterized in that: The invention comprises a protective contact part (1), an axle end connection part (2) and a movable tray (3); the protective contact part is a block structure and its left and right end faces are vertical faces that can be fitted with the push end of a bearing press or the end face of an EMU axle; a bell mouth (12) is provided on the vertical face of the protective contact part close to the end of the bearing press (5); the bell mouth (12) is fitted with a pin (51) provided at the push end of the bearing press (5); the axle end connection part (2) is at least one columnar rod fitted with a porous structure (41) of the EMU axle end (4); the movable tray (3) comprises a movable base (31), a telescopic rod (32) arranged on the movable base and a tray (33) arranged at the end of the telescopic rod; the upper end face of the tray (33) can be in contact with the bottom face of the protective contact part (1) by adjusting the height and play a supporting role.

2. The EMU bearing press-fitting protective tooling according to claim 1 is characterized in that: The shaft end connecting portion (2) is a single columnar rod arranged in the middle of the right end surface of the protective contact portion, and the single columnar rod can be embedded in the middle large hole of the porous structure (41).

3. The EMU bearing press-fitting protective tooling according to claim 1 is characterized in that The shaft end connection portion (2) is provided with four columnar rods evenly arranged in the circumferential direction on the right end surface of the protective contact portion, and the four columnar rods can be embedded in four small holes in the circumferential direction of the porous structure (41).

4. The EMU bearing press-fitting protective tooling according to claim 1 is characterized in that The protective contact portion (1) is a cylindrical structure with a hollow center.

5. The EMU bearing press-fitting protective tooling according to claim 1 is characterized in that The protective contact portion (1) is a cylindrical structure with a hollow middle portion and provided with a reinforcing material (11).

6. The EMU bearing press-fitting protective tooling according to claim 1 is characterized in that The base is a flat trolley with rollers, and the telescopic rod (32) includes a base rod (321) whose bottom is fixed on the flat trolley and a telescopic sliding rod (322) which is sleeved in the base rod and can be telescoped.

7. The EMU bearing press-fitting protective tooling according to any one of claims 1 to 6 is characterized in that An elastic rubber pad (7) with holes may also be placed on the side of the protective contact portion (1) close to the axle end of the EMU.

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