One-way needle bearing

Abstract

The utility model discloses a one-way needle roller bearing which comprises a bearing inner ring and a bearing outer ring, the bearing outer ring is sleeved on the periphery of the bearing inner ring, the bearing outer ring and the bearing inner ring are in clearance fit, and a one-way stop device and a plurality of needle rollers are arranged on the bearing inner ring. The one-way stop device and the roller pin are integrated on the same radial plane of the bearing inner ring, the roller pin is in clearance rolling fit with the bearing inner ring and the bearing outer ring, and the one-way stop device can be connected with the bearing outer ring. And the one-way stop device is used for controlling whether the bearing inner ring and the bearing outer ring synchronously rotate or not. The needle roller and the one-way stop device are integrated on the same radial plane of the bearing inner ring, traditional height limitation is broken through through single-layer layout, the overall thickness of the one-way needle roller bearing can be effectively reduced, and the one-way needle roller bearing can be suitable for being installed and used in places with small axial space.

Description

Technical Field

[0001] This utility model relates to the field of needle roller bearing technology, specifically to a one-way needle roller bearing. Background Technology

[0002] Needle roller bearings are roller bearings with cylindrical rollers that are both thin and long relative to their diameter. These rollers are called needles. Despite their small cross-section, these bearings have a high load-carrying capacity, making them particularly suitable for applications where radial space is limited. One-way needle roller bearings are those that can rotate freely in one direction but are locked in the other; they are also known as needle roller clutches.

[0003] One-way needle roller bearings mainly consist of an inner ring and an outer ring, with needle rollers and a clutch mechanism positioned between them. In existing one-way needle roller bearings, the needle rollers and clutch mechanism are typically arranged in two layers, requiring both the inner and outer rings to have two layers, which inevitably increases the overall thickness of the bearing. Therefore, existing one-way needle roller bearings are generally quite thick, making them unsuitable for installations with limited axial space, especially for precision equipment or instruments. Based on this, it is necessary to improve the structure of existing one-way needle roller bearings. Utility Model Content

[0004] To address some or all of the problems existing in the prior art, this utility model provides a one-way needle roller bearing, including an inner bearing ring and an outer bearing ring. The outer bearing ring is sleeved around the inner bearing ring, and the two are in clearance fit. The inner bearing ring is provided with a one-way stop device and a plurality of needle rollers. The one-way stop device and the needle rollers are integrated on the same radial plane of the inner bearing ring. The needle rollers are in clearance rolling fit with the inner bearing ring and the outer bearing ring respectively. The one-way stop device can be connected to the outer bearing ring. The one-way stop device is used to control whether the inner bearing ring and the outer bearing ring rotate synchronously.

[0005] As a further improvement of this utility model, a first mounting groove is provided on the front end face of the bearing inner ring at a position corresponding to the needle roller. The first mounting groove extends to the outer side wall of the bearing inner ring, and the needle roller is respectively disposed in the corresponding first mounting groove and is movably engaged with the first mounting groove.

[0006] As a further improvement of this utility model, the needle rollers are divided into three groups of two, and the three groups of needle rollers are distributed in a circumferential array along the inner ring of the bearing.

[0007] As a further improvement of this utility model, the one-way stop device includes a stop pin and an elastic element. The elastic element is connected to the inner ring of the bearing, the stop pin is movably disposed on the inner ring of the bearing, and the elastic element is connected to the stop pin. The elastic element is used to drive the stop pin to abut against the outer ring of the bearing.

[0008] As a further improvement of this utility model, a second mounting groove is provided on the front end face of the bearing inner ring at a position corresponding to the stop pin. The second mounting groove extends to the outer side wall of the bearing inner ring. The stop pin is movably disposed in the second mounting groove. One end of the elastic member is connected to the side wall of the second mounting groove, and the other end abuts against the stop pin.

[0009] As a further improvement of this utility model, the second mounting groove has a wedge-shaped structure, and the maximum depth of the second mounting groove is greater than the cross-sectional diameter of the stop pin.

[0010] As a further improvement of this utility model, the elastic element is a metal helical spring.

[0011] As a further improvement of this utility model, there are three one-way stop devices, and the three one-way stop devices are distributed in a circumferential array on the inner ring of the bearing.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention integrates needle rollers and a one-way stop device on the same radial plane of the bearing inner ring. By breaking through the traditional height limitation through a single-layer layout, it can effectively reduce the overall thickness of the one-way needle roller bearing. Actual measurements show that the thickness is reduced by 30%-40% compared to existing one-way needle roller bearings, making it suitable for installation and use in places with limited axial space. This expands the applicability of one-way needle roller bearings and has high market value and application prospects. Attached Figure Description

[0014] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the bearing inner ring in an embodiment of this utility model. Detailed Implementation

[0017] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0018] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] like Figure 1-2 As shown, a one-way needle roller bearing includes an outer ring 1 and an inner ring 2. The outer ring 1 is fitted around the inner ring 2 with a clearance fit. The inner ring 2 is equipped with a one-way stop device and multiple needle rollers 3. The one-way stop device and the needle rollers 3 are integrated on the same radial plane of the inner ring 2. The needle rollers 3 have a clearance rolling fit with both the inner ring 2 and the outer ring 1. The one-way stop device can be connected to the outer ring 1 and is used to control whether the inner ring 2 and the outer ring 1 rotate synchronously. In practical use, an external drive device can be connected to either the inner ring 2 or the outer ring 1 to drive them to rotate. The one-way stop device can control the inner ring 2 and the outer ring 1 to rotate synchronously in one direction of rotation, while preventing them from rotating synchronously in the other direction. For example, in a specific implementation, an external drive device is connected to the outer ring 1 of the bearing, which can drive the outer ring 1 of the bearing to rotate clockwise or counterclockwise. When the external drive device drives the outer ring 1 of the bearing to rotate counterclockwise, the one-way stop device is connected to the inner ring 2 of the bearing, so the counterclockwise rotation of the inner ring 2 of the bearing can drive the inner ring 2 of the bearing to rotate synchronously. When the external drive device drives the outer ring 1 of the bearing to rotate clockwise, the one-way stop device will disengage from the inner ring 2 of the bearing, so the inner ring 2 of the bearing will not rotate synchronously with the outer ring 1 of the bearing clockwise.

[0021] This one-way needle roller bearing integrates the needle rollers 3 and the one-way stop device on the same radial plane of the inner ring 2 of the bearing. By breaking through the traditional height limitation through a single-layer layout, it can effectively reduce the overall thickness of the one-way needle roller bearing. Actual measurements show that the thickness is reduced by 30%-40% compared to existing one-way needle roller bearings, making it suitable for installation and use in places with limited axial space. This expands the applicability of the one-way needle roller bearing and gives it high market value and application prospects.

[0022] A first mounting groove 21 is provided on the front end face of the inner ring 2, corresponding to the position of the needle roller 3. The first mounting groove 21 extends to the outer wall of the inner ring 2. The needle rollers 3 are respectively disposed in the first mounting groove 21 and are movably engaged with the first mounting groove 21. When the outer ring 1 of the bearing is driven to rotate by an external drive device, the outer ring 1 of the bearing will drive the needle rollers 3 to rotate in the first mounting groove 21. If the outer ring 1 of the bearing rotates but the inner ring 2 of the bearing does not rotate, the needle rollers 3 will roll on the inner wall of the outer ring 1 of the bearing. By setting the needle rollers 3, the transmission loss between the inner ring 2 and the outer ring 1 of the bearing can be reduced, and the transmission efficiency can be improved.

[0023] Specifically, in this embodiment, the needle rollers 3 are divided into three groups of two, with the first mounting groove 21 corresponding to each needle roller 3, and the three groups of needle rollers 3 are arranged in a circumferential array along the inner ring 2 of the bearing. By arranging the six needle rollers 3 in a circumferential array on the inner ring 2 of the bearing, the inner ring 2 and the outer ring 1 of the bearing can be stably matched, ensuring concentricity during rotation, reducing losses, and improving transmission efficiency. In other embodiments, the number of needle rollers 3 can be any other number or any group, as long as the needle rollers 3 in each group are arranged in a circumferential array.

[0024] In this embodiment, there are three one-way stop devices, arranged in a circular array on the inner ring 2 of the bearing, and staggered with the three sets of needle rollers 3. By providing three one-way stop devices, the outer ring 1 and the inner ring 2 of the bearing can be connected at three points, ensuring stable synchronous rotation between them and improving transmission efficiency and stability. In other embodiments, the number and distribution of the one-way stop devices can be any other form, as long as they can control the connection or disconnection between the inner ring 2 and the outer ring 1.

[0025] Specifically, the one-way stop device includes a stop pin 4 and an elastic element 5. The stop pin 4 has a cylindrical structure, and the elastic element 5 is fixedly installed on the inner ring 2 of the bearing. The stop pin 4 is movably disposed on the inner ring 2 of the bearing. One end of the elastic element 5 is connected to the inner ring 2 of the bearing, and the other end is connected to the stop pin 4. The elastic element 5 is used to drive the stop pin 4 to abut against the outer ring 1 of the bearing.

[0026] During operation, when the external drive device drives the outer ring 1 of the bearing to rotate clockwise, the outer ring 1 pushes the stop pin 4 towards the elastic element 5, thereby compressing the elastic element 5. At this time, the inner ring 2 of the bearing will not connect with the outer ring 1, so the clockwise rotation of the outer ring 1 cannot drive the inner ring 2 to rotate synchronously. When the external drive device drives the outer ring 1 of the bearing to rotate counterclockwise, the elastic force of the elastic element 5 will push the stop pin 4 away from the elastic element 5 until the stop pin 4 abuts against the outer ring 1, thereby limiting the connection between the inner ring 2 and the outer ring 1. Then, the counterclockwise rotation of the outer ring 1 will drive the inner ring 2 to rotate synchronously.

[0027] To facilitate assembly, a second mounting groove 22 is provided on the front end face of the bearing inner ring 2 at a position corresponding to the stop pin 4. The second mounting groove 22 extends to the outer side wall of the bearing inner ring 2. The stop pin 4 is movably disposed within the second mounting groove 22. One end of the elastic member 5 is fixedly connected to the second mounting groove 22, and the other end abuts against the stop pin 4. By providing the second mounting groove 22, it is easy to movably install the stop pin 4 onto the bearing inner ring 2, thereby improving the stability of the transmission.

[0028] Specifically, the second mounting groove 22 has a wedge-shaped structure, and the maximum depth of the second mounting groove 22 is greater than the cross-sectional diameter of the stop pin 4. The wedge shape of the second mounting groove 22 allows the stop pin 4 to abut or separate from the outer ring 1 of the bearing during its rolling motion within the groove. The maximum depth of the second mounting groove 22 is greater than the cross-sectional diameter of the stop pin 4 to allow the stop pin 4 to disengage from the outer ring 1 of the bearing, preventing the inner ring 2 of the bearing from rotating synchronously with the outer ring 1. In operation, when the external drive device drives the outer ring 1 to rotate clockwise, the outer ring 1 pushes the stop pin 4 towards the elastic element 5, compressing the elastic element 5. The stop pin 4 rolls from a shallower position to a deeper position within the second mounting groove 22 until it disengages from the inner wall of the outer ring 1, at which point the outer ring 1 will not drive the inner ring 2 to rotate. When the external drive device drives the outer ring 1 of the bearing to rotate counterclockwise, the elastic force of the elastic element 5 pushes the stop pin 4 to roll from a deeper position to a shallower position in the second mounting groove 22 until the stop pin 4 abuts against the inner wall of the outer ring 1 of the bearing, thereby limiting and fixing the inner ring 2 of the bearing to the outer ring 1 of the bearing. At this time, the counterclockwise rotation of the outer ring 1 of the bearing will drive the inner ring 2 of the bearing to rotate counterclockwise synchronously.

[0029] In this embodiment, the elastic element 5 is a metal helical spring; in other embodiments, the elastic element 5 may also be a spring sheet or other elastic device or structure.

[0030] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A one-way needle roller bearing, characterized in that: The bearing includes an inner ring and an outer ring. The outer ring is fitted around the inner ring with a clearance fit. The inner ring has a one-way stop device and multiple needle rollers. The one-way stop device and the needle rollers are integrated on the same radial plane of the inner ring. The needle rollers have a clearance rolling fit with both the inner and outer rings. The one-way stop device can be connected to the outer ring and is used to control whether the inner and outer rings rotate synchronously.

2. The one-way needle roller bearing according to claim 1, characterized in that: The bearing inner ring has a first mounting groove at a position corresponding to the needle roller on its front end surface. The first mounting groove extends to the outer side wall of the bearing inner ring. The needle roller is respectively disposed in the corresponding first mounting groove and is movably engaged with the first mounting groove.

3. The one-way needle roller bearing according to claim 2, characterized in that: The needle rollers are divided into three groups of two, and the three groups of needle rollers are distributed in a circumferential array along the inner ring of the bearing.

4. The one-way needle roller bearing according to claim 1, characterized in that: The one-way stop device includes a stop pin and an elastic element. The elastic element is connected to the inner ring of the bearing. The stop pin is movably disposed on the inner ring of the bearing. The elastic element is connected to the stop pin. The elastic element is used to drive the stop pin to abut against the outer ring of the bearing.

5. The one-way needle roller bearing according to claim 4, characterized in that: The bearing inner ring has a second mounting groove at a position corresponding to the stop pin on its front end face. The second mounting groove extends to the outer side wall of the bearing inner ring. The stop pin is movably disposed in the second mounting groove. One end of the elastic member is connected to the side wall of the second mounting groove, and the other end abuts against the stop pin.

6. The one-way needle roller bearing according to claim 5, characterized in that: The second mounting groove has a wedge-shaped structure, and the maximum depth of the second mounting groove is greater than the cross-sectional diameter of the stop pin.

7. The one-way needle roller bearing according to claim 4, characterized in that: The elastic element is a metal helical spring.

8. The one-way needle roller bearing according to any one of claims 1-7, characterized in that: There are three one-way stop devices, and the three one-way stop devices are arranged in a circumferential array on the inner ring of the bearing.

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