Thin-walled deep groove ball bearing with outer diameter injection molding

Abstract

The utility model relates to bearing technical field especially is related to a kind of thin-wall type deep groove ball bearing of outer diameter injection molding, including inner ring and outer ring, retaining cage is arranged between the inner ring and outer ring, a plurality of ball are arranged on the retaining cage, injection slot is opened in the outer ring, the injection slot is circumferentially arranged around outer ring, nylon resin rubber is arranged in the injection slot, and the nylon resin rubber is used for abutting motor housing. The injection slot is opened in the outer ring, and the nylon resin rubber is arranged in the injection slot, the thermal expansion coefficient of the nylon resin rubber is relatively large, the outer ring of bearing can still be able to with aluminum shell interference fit after aluminum shell thermal expansion, so as to avoid the situation that bearing appears skidding when working, reduce the situation that noise appears.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to a thin-walled deep groove ball bearing with an outer diameter injection molded. Background Technology

[0002] Bearings are common mechanical components, and their working principle is very easy to understand. When a bearing is installed on a car brake motor, the fit is an interference fit between the shaft and the bearing inner diameter, and a transition fit between the bearing outer diameter and the housing. The bearing outer ring is fixed to the housing by a wave spring. Since the working temperature is -40 degrees Celsius to 120 degrees Celsius, and the housing material is usually ADC12, the thermal expansion coefficient of ADC12 is much greater than that of bearing steel. Therefore, the aluminum housing expands when heated, and the transition fit between the bearing outer ring and the housing bore is transformed into a clearance fit. When the bearing is working, the outer ring slips, which causes noise from the brake motor. Utility Model Content

[0003] To address the problem of slippage in the bearings of automotive brake motors due to housing deformation during use, this application provides a thin-walled deep groove ball bearing with an outer diameter injection molded, as detailed below.

[0004] A thin-walled deep groove ball bearing with outer diameter injection molding includes an inner ring and an outer ring. A cage is provided between the inner ring and the outer ring, and a plurality of balls are provided on the cage. An injection groove is formed on the outer ring and is arranged circumferentially around the outer ring. Nylon resin rubber is provided in the injection groove and is used to abut against the motor housing.

[0005] By adopting the above technical solution, an injection groove is opened on the outer ring, and nylon resin rubber is placed in the injection groove. The nylon resin rubber has a large coefficient of thermal expansion, which can ensure that the outer ring of the bearing can still be interference-fitted with the aluminum housing after the aluminum housing is heated and expanded, thereby avoiding the bearing slipping during operation and reducing noise.

[0006] Optionally, the nylon resin rubber injection molding is performed within an injection molding groove.

[0007] By adopting the above technical solution, the nylon resin rubber is set in the injection molding groove through injection molding, and the nylon resin rubber is fixed more firmly and is not easy to fall off during deformation.

[0008] Optionally, the injection groove has a circular arc cross-section.

[0009] By adopting the above technical solution, since the strength of the outer ring of a thin-walled bearing is reduced after slotting, there is a risk of breakage during use. Therefore, setting the injection groove to be arc-shaped can effectively increase the effective thickness of the outer ring, thereby reducing the risk of breakage.

[0010] Optionally, the center of the injection groove is located on the outer diameter of the outer ring.

[0011] By adopting the above technical solution, setting the center of the injection molding groove on the outer diameter can also reduce the area of ​​the injection molding groove cross-section, thereby further increasing the effective thickness and reducing the risk of breakage.

[0012] Optionally, the radius of the injection groove is greater than or equal to 0.8 mm and less than or equal to 1.2 mm.

[0013] By adopting the above technical solutions, the radius of the injection molding groove is set within this range, making it less prone to breakage, and enabling the nylon resin rubber to effectively maintain an interference fit with the shell.

[0014] Optionally, the thickness of the outer ring is greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

[0015] By adopting the above technical solution, since the grooved ring is prone to breakage, thickening the outer ring to a certain extent can further increase the effective thickness of the outer ring and reduce the occurrence of breakage.

[0016] Optionally, two injection molding grooves are provided, and each injection molding groove is filled with nylon resin rubber.

[0017] By adopting the above technical solution, setting two injection grooves can disperse the thinner parts of the outer ring, effectively solving the problem that a single injection groove is too large and prone to breakage. At the same time, the interference fit between the two injection grooves is better.

[0018] Optionally, the injection groove is symmetrically arranged along the centerline of the bearing.

[0019] By adopting the above technical solutions, the injection groove is symmetrically arranged along the centerline of the bearing, which can make the outer ring more uniformly stressed in the motor housing and ensure the stability of the bearing operation.

[0020] In summary, this application has at least the following beneficial effects: 1. This application solves the problem of slippage of the bearing on the automotive brake motor due to the deformation of the housing during use under the prior art. This application provides nylon resin rubber on the outer ring. Since nylon resin rubber has a larger coefficient of thermal expansion, when the aluminum housing is heated and expanded, the nylon resin rubber can also expand accordingly, thereby maintaining an interference fit, reducing slippage and lowering noise during use.

[0021] 2. By using an arc-shaped injection groove and increasing the thickness of the outer ring, this application can effectively increase the effective thickness of the outer ring and reduce the possibility of damage to the outer ring caused by grooving. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of this embodiment.

[0023] Figure 2 This is a cross-sectional view of the outer ring in this embodiment.

[0024] Explanation of reference numerals in the attached figures: 1. Inner ring; 11. Cage; 111. Ball bearings; 2. Outer ring; 21. Injection groove; 211. Nylon resin rubber. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] A thin-walled deep groove ball bearing with an injection-molded outer diameter, such as Figure 1 and Figure 2 As shown, the motor includes an inner ring 1 and an outer ring 2. A retainer 11 is provided between the inner ring 1 and the outer ring 2, and multiple balls 111 are provided on the retainer 11. An injection groove 21 is formed on the outer ring 2, and the injection groove 21 is arranged circumferentially around the outer ring 2. Nylon resin rubber 211 is provided in the injection groove 21, which is used to abut against the motor housing. In specific implementation, the nylon resin rubber 211 is injection molded into the injection groove 21. First, the injection groove 21 needs to be machined around the outer ring 2, and then the nylon resin rubber 211 is injected into the injection groove 21 by injection molding. When the motor is in use, the aluminum housing material is usually ADC12, which will expand when heated. The transition fit between the aluminum housing and the bearing will change to a clearance fit. However, the coefficient of thermal expansion of the nylon resin rubber 211 is greater than that of the aluminum housing. Therefore, after the nylon rubber resin expands, it will maintain the interference fit between the bearing and the aluminum housing.

[0027] like Figure 1 and Figure 2 As shown, the injection groove 21 has a circular arc cross-section. The center of the injection groove 21 is located on the outer diameter of the outer ring 2. The radius of the injection groove 21 is greater than or equal to 0.8 mm and less than or equal to 1.2 mm. In practical implementation, this type of bearing is typically a thin-walled deep groove ball bearing of the 618 or 619 series. Therefore, setting the injection groove 21 to 0.8 mm and 1.2 mm can effectively increase the effective thickness of the outer ring 2, thereby reducing the possibility of bearing breakage.

[0028] like Figure 1 and Figure 2As shown, the thickness of the outer ring 2 is greater than or equal to 1.5 mm and less than or equal to 2.5 mm. In practice, the thickness of the outer ring 2 of conventional 618 and 619 series bearings is in the range of 1 mm to 2 mm. By shifting the center radial inner ring 1 by 1 mm in the diameter direction, the finite wall thickness of the outer ring 2 is increased by 0.5 mm, which can effectively increase the strength of the bearing and further reduce the possibility of outer ring 2 breaking.

[0029] like Figure 1 and Figure 2 As shown, two injection grooves 21 are provided, each containing nylon resin rubber 211. The injection grooves 21 are symmetrically arranged along the centerline of the bearing. In practice, the two injection grooves 21 are identical in shape and size, which can disperse the thinner area of ​​the outer ring 2, thereby reducing the possibility of the outer ring 2 breaking due to grooving.

[0030] Working principle: By setting nylon resin rubber 211 on the outer ring 2, since nylon resin rubber 211 has a larger coefficient of thermal expansion, when the aluminum housing expands due to heat, nylon resin rubber 211 can also expand accordingly, thereby maintaining an interference fit, reducing bearing slippage, reducing noise during use, and improving user comfort.

[0031] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A thin-walled deep groove ball bearing with an outer diameter injection molded, characterized in that: The device includes an inner ring (1) and an outer ring (2). A retainer (11) is provided between the inner ring (1) and the outer ring (2). A plurality of balls (111) are provided on the retainer (11). An injection groove (21) is provided on the outer ring (2). The injection groove (21) is arranged circumferentially around the outer ring (2). Nylon resin rubber (211) is provided in the injection groove (21). The nylon resin rubber (211) is used to abut against the motor housing.

2. The thin-walled deep groove ball bearing with outer diameter injection molding according to claim 1, characterized in that: The nylon resin rubber (211) is injection molded in the injection groove (21).

3. A thin-walled deep groove ball bearing with outer diameter injection molding according to claim 2, characterized in that: The injection groove (21) has a circular arc cross-section.

4. A thin-walled deep groove ball bearing with outer diameter injection molding according to claim 3, characterized in that: The center of the injection groove (21) is located on the outer diameter of the outer ring (2).

5. A thin-walled deep groove ball bearing with outer diameter injection molding according to claim 4, characterized in that: The radius of the injection groove (21) is greater than or equal to 0.8 mm and less than or equal to 1.2 mm.

6. A thin-walled deep groove ball bearing with outer diameter injection molding according to claim 5, characterized in that: The thickness of the outer ring (2) is greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

7. A thin-walled deep groove ball bearing with outer diameter injection molding according to claim 1, characterized in that: Two injection molding grooves (21) are provided, and each injection molding groove (21) is provided with nylon resin rubber (211).

8. A thin-walled deep groove ball bearing with outer diameter injection molding according to claim 7, characterized in that: The injection groove (21) is symmetrically arranged along the centerline of the bearing.

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