Wear-resistant oscillating bar bearing

Abstract

The utility model discloses a wear-resistant oscillating bar bearing which comprises an outer ring and an inner ring, and the inner ring is provided with a middle hole; the inner ring is provided with an end ring communicated with the middle hole, the end ring is connected with a spline, the spline is provided with an extension part, the extension part is provided with a positioning bulge, the end ring is provided with a positioning groove corresponding to the extension part, the end ring is provided with a fixed screw pin in a penetrating manner along the radial direction, and the positioning bulge is provided with a limiting screw groove corresponding to the fixed screw pin, so that the inner ring is detachably connected with the spline. The spline assembly is novel in structure, the spline and the inner ring can be detached and separated, the damaged spline can be replaced conveniently, flexibility and convenience are achieved, the connection mode that the spline and the inner ring are welded and fixed in the prior art is replaced, and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of rocker bearings, and in particular relates to a wear-resistant rocker bearing. Background Art

[0002] The rocker bearing is a type of spherical bearing. It is widely used in low-speed swinging, tilting and rotating motions. It is a common part in hammer drill tools and can rotate in multiple directions compared to traditional round bearings.

[0003] In the existing rocker bearing, the inner ring is meshed with the matching gear through a spline, and the spline is fixed to the inner ring by welding. When the teeth of the spline are cracked or damaged, the spline cannot be disassembled and replaced, and only the inner ring can be replaced, which increases maintenance costs.

[0004] The existing patent document (publication number: CN218542951U) discloses "a single-row rocker bearing", which also has the above-mentioned technical problems. Summary of the invention

[0005] The utility model aims to solve the above-mentioned technical problems existing in the prior art and provides a wear-resistant rocker arm bearing with novel structure. The spline and the inner ring can be detachably separated to facilitate replacement of damaged splines. It is flexible and convenient and replaces the welding and fixing connection method of the spline and the inner ring in the prior art, thereby reducing maintenance costs.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A wear-resistant rocker bearing comprises: an outer ring and an inner ring, wherein the inner ring is provided with a central hole; the inner ring is characterized in that: the inner ring is provided with an end ring communicating with the central hole, a spline is connected to the end ring, the spline is provided with an extension, a positioning protrusion is provided on the extension, the end ring is provided with a positioning groove corresponding to the extension, a fixing screw pin is radially penetrated through the end ring, and a limiting screw groove corresponding to the fixing screw pin is provided on the positioning protrusion, so that the inner ring can be disassembled and connected to the spline. The rocker bearing has a novel structure, the spline and the inner ring can be disassembled and separated, and the damaged spline is easy to replace, which is flexible and convenient, and replaces the welding and fixing connection method of the spline and the inner ring in the prior art, thereby reducing the maintenance cost.

[0008] Furthermore, an oil injection hole is provided on the outer ring, and an oil guide channel is connected between the oil injection hole and the inner raceway of the outer ring. Lubricating oil is injected from the oil injection hole, and the lubricating oil flows into the inner raceway of the outer ring through the oil guide channel, lubricating the inner raceway of the outer ring, the balls, and the outer raceway of the inner ring, slowing down wear and extending the service life.

[0009] Furthermore, a sealing plug is plugged on the oil filling hole, which blocks the oil filling hole to prevent the lubricating oil from flowing out of the oil filling hole, and is convenient to disassemble and assemble, has reliable connection, and is not easy to fall off freely.

[0010] Furthermore, the spline is provided with an external spline portion, and the cross-sectional diameter of the external spline portion is larger than the cross-sectional diameter of the spline. When there is a size difference between the spline and the gear to be connected, the contact between the two is not sufficient, which will affect the reliability of the transmission. By connecting the external spline portion with the gear, the contact is more sufficient and the connection is more reliable. The provision of the external spline portion improves the connection adaptability of the spline.

[0011] Furthermore, the spacing between adjacent limiting screw grooves is 5-10mm. By connecting the fixing screw pin with the limiting screw grooves at different horizontal positions, the length of the extension portion entering the positioning groove can be changed, thereby changing the spacing between the outer spline portion and the inner ring to adapt to the gear connected to the outer spline portion during actual use, which is conducive to full contact between the outer spline portion and the gear, ensuring the reliability of transmission.

[0012] Furthermore, a keyway is provided on the inner hole wall of the spline to facilitate the connection with the flat key on the rotating shaft, thereby reducing the difficulty of docking.

[0013] Furthermore, the surfaces of the outer ring and the inner ring are coated with a wear-resistant layer, which can be made of a copper-zinc alloy layer with good wear resistance and is not easy to wear and rust, thereby extending the service life of the outer ring and the inner ring.

[0014] The utility model has the following beneficial effects due to the adoption of the above technical solution:

[0015] 1. The spline and the inner ring are detachable and separable, which is convenient for replacing damaged splines. It is flexible and convenient, replacing the welding and fixing connection method between the spline and the inner ring in the prior art, reducing maintenance costs. During installation, the positioning protrusion is embedded in the positioning groove to realize the rapid positioning of the spline on the inner ring, and then a fixing screw is passed through the end ring, and the fixing screw is screwed into the limiting screw groove. The extension part is locked by the fixing screw pin to limit the extension part from freely escaping from the positioning groove, so that the spline is fixed on the inner ring, which is reliable and stable.

[0016] 2. When there is a size difference between the spline and the mating gear, the contact between the two is not sufficient, which will affect the reliability of the transmission. By mating and connecting with the gear through the external spline part, the contact is more sufficient and the connection is more reliable. The setting of the external spline part improves the connection adaptability of the spline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the connection between the outer ring and the inner ring in Example 1;

[0020] Figure 3It is a structural schematic diagram of the spline in the first embodiment;

[0021] Figure 4 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of the outer ring in the second embodiment.

[0023] In the figure: 1-outer ring; 2-inner ring; 3-cage; 4-ball; 5-end ring; 6-spline; 7-keyway; 8-extension part; 9-positioning protrusion; 10-positioning groove; 11-fixing screw pin; 12-limiting screw groove; 13-external spline part; 14-oil filling hole; 15-oil guide channel; 16-sealing plug. DETAILED DESCRIPTION

[0024] like Figures 1 to 3 As shown, this is an embodiment of the present utility model

[0025] A wear-resistant rocker bearing comprises: an outer ring 1, an inner ring 2, a retainer 3 and a ball 4, wherein the ball 4 is embedded in the retainer 3, the outer ring 1 is provided with an inner raceway corresponding to the ball 4, the inner ring 2 is provided with an outer raceway corresponding to the ball 4, the inner ring 2 is provided with a center hole, the inner ring 2 is provided with an end ring 5 communicated with the center hole, the end ring 5 is connected with a spline 6, and a keyway 7 is provided on the inner hole wall of the spline 6, which is convenient for matching and connecting with a flat key on a rotating shaft, thereby reducing the difficulty of docking.

[0026] The spline 6 is provided with an extension portion 8, the extension portion 8 is provided with a positioning protrusion 9, the end ring 5 is provided with a positioning groove 10 corresponding to the extension portion 8, the end ring 5 is radially penetrated by a fixing screw pin 11, and the positioning protrusion 9 is provided with a limiting screw groove 12 corresponding to the fixing screw pin 11.

[0027] The spline 6 is detachable from the inner ring 2, which is convenient for replacing damaged splines 6. It is flexible and convenient, and replaces the welding and fixing connection method between the spline 6 and the inner ring 2 in the prior art, thereby reducing maintenance costs. During installation, the positioning protrusion 9 is embedded in the positioning groove 10 to achieve rapid positioning of the spline 6 on the inner ring 2, and then a fixing screw 11 is passed through the end ring 5, and the fixing screw 11 is screwed into the limiting screw groove 12. The extension part 8 is locked by the fixing screw 11, and the extension part 8 is limited from freely escaping from the positioning groove 10, so that the spline 6 is fixed on the inner ring 2, which is reliable and stable.

[0028] The spline 6 is provided with an external spline portion 13, and the cross-sectional diameter of the external spline portion 13 is larger than the cross-sectional diameter of the spline 6. When there is a size difference between the spline 6 and the gear to be connected, the contact between the two is not sufficient, which will affect the reliability of the transmission. By connecting the external spline portion 13 with the gear, the contact is more sufficient, and the setting of the external spline portion 13 improves the connection adaptability of the spline 6.

[0029] The spacing between two adjacent limiting screw grooves 12 is 5-10mm. By connecting the fixing screw pin 11 with the limiting screw grooves 12 at different horizontal positions, the length of the extension portion 8 entering the positioning groove 10 can be changed, thereby changing the spacing between the external spline portion 13 and the inner ring 2 to adapt to the gear connected to the external spline portion 13 during actual use, which is conducive to the external spline portion 13 fully contacting the gear and ensuring the reliability of transmission.

[0030] The surfaces of the outer ring 1 and the inner ring 2 are coated with a wear-resistant layer. The wear-resistant layer can be made of a copper-zinc alloy layer, which has good wear resistance and is not easy to wear and rust, thereby extending the service life of the outer ring 1 and the inner ring 2.

[0031] like Figure 4 and Figure 5 As shown, this is the second embodiment of the utility model

[0032] In the technical solution based on the first embodiment, an oil injection hole 14 is provided on the outer ring 1, and an oil guide channel 15 is connected between the oil injection hole 14 and the inner raceway of the outer ring 1. Lubricating oil is injected from the oil injection hole 14, and the lubricating oil flows into the inner raceway of the outer ring 1 through the oil guide channel 15, lubricating the inner raceway of the outer ring 1, the balls 4, and the outer raceway of the inner ring 2, thereby reducing wear and extending the service life.

[0033] The oil filling hole 14 is plugged with a sealing plug 16. The sealing plug 16 blocks the oil filling hole 14 to prevent the lubricating oil from flowing out of the oil filling hole 14, and is convenient to disassemble and assemble, has reliable connection, and is not easy to fall off freely.

[0034] The above are only specific embodiments of the utility model, but the technical features of the utility model are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the utility model to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the utility model.

Claims

1. A wear-resistant rocker bearing, comprising: An outer ring and an inner ring, wherein the inner ring is provided with a central hole; Features: The inner ring is provided with an end ring communicated with the central hole, the end ring is connected with a spline, the spline is provided with an extension portion, the extension portion is provided with a positioning protrusion, the end ring is provided with a positioning groove corresponding to the extension portion, the end ring is radially penetrated with a fixing screw pin, the positioning protrusion is provided with a limiting screw groove corresponding to the fixing screw pin, so that the inner ring can be detachably connected to the spline.

2. The wear-resistant rocker bearing according to claim 1, characterized in that: An oil filling hole is provided on the outer ring, and an oil guide channel is connected between the oil filling hole and the inner raceway of the outer ring.

3. The wear-resistant rocker bearing according to claim 2, characterized in that: The oil filling hole is plugged with a sealing plug.

4. The wear-resistant rocker bearing according to claim 1, characterized in that: The spline is provided with an outer spline portion, and the cross-sectional diameter of the outer spline portion is larger than the cross-sectional diameter of the spline.

5. The wear-resistant rocker bearing according to claim 4, characterized in that: The spacing between adjacent limiting screw grooves is 5-10 mm.

6. The wear-resistant rocker bearing according to claim 1, characterized in that: A keyway is arranged on the inner hole wall of the spline.

7. The wear-resistant rocker bearing according to claim 1, characterized in that: The surfaces of the outer ring and the inner ring are both coated with a wear-resistant layer.

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