A wiper motor with a new type of oil-impregnated bearing

Abstract

The utility model relates to the field of automobile parts discloses a wiper motor with novel oil bearing, including casing, armature shaft and oil bearing, armature shaft is worn and is established on oil bearing, the bottom of casing is equipped with the support wall for supporting oil bearing in, the bottom of oil bearing and the bottom of casing form closed cavity between, be equipped with exhaust groove on oil bearing, exhaust groove links to each other closed cavity and the upper space of oil bearing, to discharge the gas in closed cavity, make oil bearing and armature shaft install in place. The wiper motor with novel oil bearing in the utility model, through setting up exhaust groove on oil bearing, discharge the compressed air in closed cavity, reduce the air pressure that armature shaft received when installing, avoid the problem that armature shaft is not installed in place or is stressed to bend, increase the installation reliability of armature shaft, avoid the unbalance of armature shaft operation and make the wiper motor operation produce the abnormal sound.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and more specifically, to a wiper motor with a novel oil-impregnated bearing. Background Technology

[0002] During the assembly of the wiper motor armature shaft into the oil-impregnated bearing at the bottom of the wiper motor housing, the housing is already magnetized. The armature shaft is quickly attracted to the oil-impregnated bearing's assembly position. The oil-impregnated bearing has a spherical structure and contains a certain amount of oil. Over time, grease will seep out onto its outer surface, filling the gap between the bearing's outer surface and the housing's inner wall. Furthermore, the armature shaft itself is coated with a certain amount of grease. When the armature shaft is installed into the oil-impregnated bearing support wall, the grease quickly fills the gap between the armature shaft and the support wall. This creates a closed cavity at the bottom of the housing, consisting of the armature shaft, grease, the oil-impregnated bearing support wall, the outer surface of the oil-impregnated bearing, and the housing's inner wall, preventing air from escaping. As the oil-impregnated bearing continues to move downwards, the closed cavity shrinks, causing a sudden increase in pressure. This can lead to problems such as improper installation or bending of the armature shaft. During operation, uneven stress can result in unbalanced armature shaft operation, causing abnormal noise from the wiper motor. Utility Model Content

[0003] To address at least one of the aforementioned problems, this utility model first provides a wiper motor with a novel oil-impregnated bearing, comprising a housing, an armature shaft, and an oil-impregnated bearing. The armature shaft passes through the oil-impregnated bearing. The bottom of the housing has a support wall for supporting the oil-impregnated bearing. A closed cavity is formed between the bottom of the oil-impregnated bearing and the bottom of the housing. The oil-impregnated bearing has an exhaust groove that connects the closed cavity and the space above the oil-impregnated bearing to discharge gas from the closed cavity, thereby allowing the oil-impregnated bearing and the armature shaft to be installed in place.

[0004] Optionally, the venting groove is provided on the side wall of the oil-impregnated bearing, and the venting groove connects the upper and lower ends of the oil-impregnated bearing.

[0005] Optionally, it also includes a bearing pressure plate, which is sleeved on the oil-impregnated bearing and abuts against the housing to limit the upward movement of the oil-impregnated bearing.

[0006] Optionally, the bearing pressure plate is provided with a mounting port suitable for installing the oil-impregnated bearing. The side wall of the mounting port is provided with a plurality of circumferentially spaced limiting plates. The limiting plates abut against the upper end side wall of the oil-impregnated bearing to restrict the upward movement of the oil-impregnated bearing.

[0007] Optionally, a cavity is formed between the bearing pressure plate, the housing, and the oil-impregnated bearing, and a vent is provided between two adjacent limiting plates. The vent is used to discharge gas in the cavity so that the bearing pressure plate and the oil-impregnated bearing are installed in place.

[0008] Optionally, two exhaust channels are symmetrically arranged, and the exhaust channels are aligned with the vent in the radial direction.

[0009] Optionally, the bearing pressure plate has an upwardly extending flange on its peripheral wall, and the inner wall of the housing has a radially protruding limiting block. The flange can undergo elastic deformation to fit into the lower part of the limiting block, and the limiting block is used to restrict the upward movement of the bearing pressure plate.

[0010] Optionally, the flange is provided with a plurality of protruding teeth, which are adapted to penetrate the inner wall of the housing or the limiting block to prevent loosening.

[0011] Optionally, the support wall is arc-shaped, and the curvature of the arc matches the curvature of the lower end of the side wall of the oil-impregnated bearing.

[0012] Optionally, it also includes a gearbox and a first positioning snap ring, wherein the armature shaft is fixed to the gearbox by the first positioning snap ring.

[0013] Compared with the prior art, the wiper motor with a novel oil-impregnated bearing in this utility model discharges compressed air from the closed cavity by setting an exhaust groove on the oil-impregnated bearing, reducing the air pressure on the armature shaft during installation, avoiding problems such as improper installation or bending of the armature shaft under force, increasing the installation reliability of the armature shaft, and preventing abnormal noise from the wiper motor caused by unbalanced operation of the armature shaft. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of a wiper motor with a novel oil-impregnated bearing according to an embodiment of the present invention;

[0015] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0016] Figure 3 This is a partial connection structure diagram of the armature shaft, oil-impregnated bearing, and bearing pressure plate according to an embodiment of the present utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Housing; 101. Support wall; 102. Enclosed cavity; 103. Cavity; 104. Limiting block; 2. Armature shaft; 3. Oil-impregnated bearing; 301. Exhaust groove; 4. Bearing pressure plate; 401. Limiting piece; 402. Vent; 403. Flange; 404. Tooth; 5. Gearbox; 6. Adjusting screw; 7. Gear; 8. First positioning circlip; 9. Positioning cylinder; 10. Rolling bearing; 11. Second positioning circlip. Detailed Implementation

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] This utility model embodiment provides a wiper motor with a novel oil-impregnated bearing, combined with... Figures 1 to 3 As shown, the device includes a housing 1, an armature shaft 2, and an oil-impregnated bearing 3. The armature shaft 2 passes through the oil-impregnated bearing 3. The bottom of the housing 1 is provided with a support wall 101 for supporting the oil-impregnated bearing 3. A closed cavity 102 is formed between the bottom of the oil-impregnated bearing 3 and the bottom of the housing 1. The oil-impregnated bearing 3 is provided with an exhaust groove 301, which connects the closed cavity 102 and the upper space of the oil-impregnated bearing 3 to discharge the gas in the closed cavity 102, so that the oil-impregnated bearing 3 and the armature shaft 2 can be installed in place.

[0021] Compared with the prior art, the wiper motor with a novel oil-impregnated bearing in this utility model discharges compressed air from the closed cavity 102 by setting an exhaust groove 301 on the oil-impregnated bearing 3, thereby reducing the air pressure on the armature shaft 2 during installation, avoiding problems such as improper installation or bending of the armature shaft 2, increasing the installation reliability of the armature shaft 2, and preventing abnormal noise from the wiper motor caused by unbalanced operation of the armature shaft 2.

[0022] Optionally, the venting groove 301 is provided on the side wall of the oil-impregnated bearing 3, and the venting groove 301 connects the upper and lower ends of the oil-impregnated bearing 3.

[0023] like Figure 3 As shown, in this embodiment, the oil-impregnated bearing 3 is approximately spherical, and the exhaust groove 301 is arc-shaped. When the oil-impregnated bearing 3 is installed on the support wall 101, a channel for gas flow is formed between the exhaust groove 301 and the support wall 101, allowing the gas in the closed cavity 102 to be discharged upward.

[0024] like Figure 2 and 3 As shown, optionally, it also includes a bearing pressure plate 4, which is sleeved on the oil-impregnated bearing 3 and abuts against the housing 1 to limit the upward movement of the oil-impregnated bearing 3.

[0025] Optionally, the bearing pressure plate 4 is provided with an installation port suitable for installing the oil-impregnated bearing 3. The side wall of the installation port is provided with a plurality of circumferentially spaced limiting pieces 401. The limiting pieces 401 abut against the upper end side wall of the oil-impregnated bearing 3 to restrict the upward movement of the oil-impregnated bearing 3.

[0026] like Figure 3 As shown, in this embodiment, the bearing pressure plate 4 is approximately circular in shape, the mounting opening is the inner ring of the ring, and there are 8 evenly spaced limiting pieces 401. The limiting pieces 401 are in contact with the arc-shaped sidewall of the oil-impregnated bearing 3. The limiting pieces 401 can undergo rigid elastic deformation, which restricts the upward movement of the oil-impregnated bearing 3 while playing a buffering role.

[0027] like Figure 2 and 3 As shown, optionally, a cavity 103 is formed between the bearing pressure plate 4, the housing 1, and the oil-impregnated bearing 3. A vent 402 is provided between two adjacent limiting plates 401. The vent 402 is used to discharge gas from the cavity 103 so that the bearing pressure plate 4 and the oil-impregnated bearing 3 can be installed in place. The exhaust groove 301 connects the closed cavity 102 and the cavity 103, and the gas in the cavity 103 can be discharged upward through the vent 402 and the exhaust groove 301.

[0028] like Figure 3 As shown, optionally, two exhaust channels 301 are symmetrically arranged, and the exhaust channels 301 are aligned with the vent 402 in the radial direction. This arrangement reduces the obstruction of the exhaust channels 301 by the limiting piece 401, resulting in better exhaust performance.

[0029] like Figure 2 and 3 As shown, optionally, the bearing pressure plate 4 has an upward flange 403 on its peripheral wall, and the inner wall of the housing 1 has a radially protruding limiting block 104. The flange 403 can undergo rigid elastic deformation to fit into the lower part of the limiting block 104. The limiting block 104 is used to restrict the upward movement of the bearing pressure plate 4.

[0030] In this embodiment, the number of limiting blocks 104 is even, and they are evenly distributed circumferentially. This arrangement provides a more uniform limiting effect on the bearing pressure plate 4, and the limiting effect transmitted from the bearing pressure plate 4 to the oil-impregnated bearing 3 is also more uniform, making the armature shaft 2 run smoothly and reducing the likelihood of abnormal noise from the wiper motor. During installation, the bearing pressure plate 4 is inserted from top to bottom. After contacting the limiting block 104, the sidewall of the flange 403 is pressed inward. After reaching below the limiting block 104, the flange 403 elastically extends outward, creating a tight abutment with the inner wall of the housing 1.

[0031] like Figure 2 and3 As shown, optionally, the flange 403 is provided with a plurality of protruding teeth 404, which are adapted to penetrate the inner wall of the housing 1 or the limiting block 104 to prevent loosening. While increasing the frictional force, the protruding teeth 404 can also slightly penetrate the side wall of the housing 1 to prevent loosening, thereby improving the reliability of the bearing pressure plate 4 in fixing the oil-impregnated bearing 3.

[0032] like Figure 2 As shown, optionally, the support wall 101 is arc-shaped, and the curvature of the arc is adapted to the curvature of the lower end of the side wall of the oil-impregnated bearing 3.

[0033] like Figure 1 As shown, optionally, it also includes a gearbox 5, an adjusting screw 6, a gear 7, a first positioning snap ring 8, a positioning cylinder 9, a rolling bearing 10, a gap spring (not shown), and a second positioning snap ring 11, wherein the armature shaft 2 is fixed to the gearbox 5 by the first positioning snap ring 8.

[0034] The armature shaft 2 is fixed to the gearbox 5 by a first positioning snap ring 8, and is further fixed to the upper part of the armature shaft 2 by an adjusting screw 6 and the housing 1. The worm gear of the armature shaft 2 meshes with the gear 7. A rolling bearing 10 is mounted on the armature shaft 2, and a positioning cylinder 9 is mounted between the rolling bearing 10 and the first positioning snap ring 8. A clearance spring is mounted on the other side of the rolling bearing 10, and is used to adjust the clearance and is limited and fixed by a second positioning snap ring 11. The armature shaft 2 passes through the oil-impregnated bearing 3 in the lower part of the housing 1, and air in the lower part of the housing 1 is discharged from the exhaust groove 301.

[0035] Similarly, the components included in the "components," "mechanisms," and "devices" of this disclosure can also be flexibly combined. They can be modularly produced according to actual needs and assembled as an independent module; or they can be assembled separately to form a module in this device. The division of the above-mentioned components in this disclosure is only one embodiment for ease of reading and is not intended to limit the scope of protection of this disclosure. Any technical solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this disclosure.

[0036] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0037] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0039] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.

Claims

1. A wiper motor with a novel oil-impregnated bearing, characterized in that, The assembly includes a housing (1), an armature shaft (2), and an oil-impregnated bearing (3). The armature shaft (2) passes through the oil-impregnated bearing (3). The bottom of the housing (1) is provided with a support wall (101) for supporting the oil-impregnated bearing (3). A closed cavity (102) is formed between the bottom of the oil-impregnated bearing (3) and the bottom of the housing (1). The oil-impregnated bearing (3) is provided with an exhaust groove (301). The exhaust groove (301) connects the closed cavity (102) and the space above the oil-impregnated bearing (3) to discharge the gas in the closed cavity (102) so that the oil-impregnated bearing (3) and the armature shaft (2) can be installed in place.

2. The wiper motor with a novel oil-impregnated bearing according to claim 1, characterized in that, The venting groove (301) is provided on the side wall of the oil-impregnated bearing (3), and the venting groove (301) connects the upper and lower ends of the oil-impregnated bearing (3).

3. The wiper motor with a novel oil-impregnated bearing according to claim 1, characterized in that, It also includes a bearing pressure plate (4), which is sleeved on the oil-impregnated bearing (3) and abuts against the housing (1) to limit the upward movement of the oil-impregnated bearing (3).

4. The wiper motor with a novel oil-impregnated bearing according to claim 3, characterized in that, The bearing pressure plate (4) is provided with an installation port suitable for installing the oil-impregnated bearing (3). The side wall of the installation port is provided with a plurality of circumferentially spaced limiting pieces (401). The limiting pieces (401) abut against the upper end side wall of the oil-impregnated bearing (3) to restrict the upward movement of the oil-impregnated bearing (3).

5. The wiper motor with a novel oil-impregnated bearing according to claim 4, characterized in that, A cavity (103) is formed between the bearing pressure plate (4), the housing (1) and the oil-impregnated bearing (3). A vent (402) is provided between two adjacent limiting plates (401). The vent (402) is used to discharge the gas in the cavity (103) so that the bearing pressure plate (4) and the oil-impregnated bearing (3) can be installed in place.

6. The wiper motor with a novel oil-impregnated bearing according to claim 5, characterized in that, Two exhaust channels (301) are symmetrically arranged, and the exhaust channels (301) are aligned with the vent (402) in the radial direction.

7. The wiper motor with a novel oil-impregnated bearing according to claim 3, characterized in that, The bearing pressure plate (4) has an upward flange (403) on its peripheral wall, and the inner wall of the housing (1) has a radially protruding limiting block (104). The flange (403) can undergo elastic deformation to fit into the lower part of the limiting block (104). The limiting block (104) is used to restrict the upward movement of the bearing pressure plate (4).

8. The wiper motor with a novel oil-impregnated bearing according to claim 7, characterized in that, The flange (403) is provided with a plurality of protruding teeth (404), which are adapted to insert into the inner wall of the housing (1) or the limiting block (104) to prevent loosening.

9. The wiper motor with a novel oil-impregnated bearing according to claim 1, characterized in that, The support wall (101) is arc-shaped, and the curvature of the arc is adapted to the curvature of the lower end of the side wall of the oil-impregnated bearing (3).

10. The wiper motor with a novel oil-impregnated bearing according to claim 1, characterized in that, It also includes a gearbox (5) and a first positioning snap ring (8), wherein the armature shaft (2) is fixed to the gearbox (5) by the first positioning snap ring (8).

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