One-way clutch of hub motor

Abstract

The one-way clutch comprises an outer ring and an inner ring which are concentrically arranged, and a rolling body is arranged between the outer wall of the inner ring and the inner wall of the outer ring; a plurality of curved-surface grooves are uniformly formed in the outer wall of the inner ring, and the rolling bodies are arranged in the curved-surface grooves; the curved surface groove is not a regular arc groove and comprises a separation groove section and a meshing groove section which are connected with each other, the separation groove section is an arc groove, the meshing groove section comprises an oblique line section and a logarithmic spiral curve section, and the oblique line section is transited to the logarithmic spiral curve section. The device is simple in structure, free of a rolling body supporting structure and a spring in the prior art, convenient to install and maintain and low in manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of clutch technology for electric motors, specifically a one-way clutch for a hub motor. Background Technology

[0002] A one-way clutch is a fundamental transmission component widely used in various machines for power transmission, backstop, and indexing. It is widely applied in automatic transmissions, hydraulic torque converter guide wheel supports, and other applications. It features rotation in one direction and backstop in the other. Existing one-way clutches generally include an outer ring, an inner ring, rolling elements, a rolling element support structure, and a spring. For example, Chinese invention patent CN 110513404B discloses a one-way clutch and a geared hub motor. The one-way clutch includes an outer ring, an inner ring, and a rolling support structure. The inner wall of the outer ring has multiple curved grooves evenly distributed circumferentially. The rolling support structure is disposed between the outer ring and the inner ring. The rolling support structure includes a cage, a needle roller, and a spring. The cage has multiple retaining grooves evenly distributed circumferentially, and the retaining grooves correspond one-to-one with the curved grooves. A needle roller and a spring are placed in the retaining groove. The length direction of the needle roller and the spring both extend axially. The spring is disposed on one side of the needle roller. The radial cross-sectional shape of the curved groove is a sloped curve. One side of the sloped curve is close to the spring, and the other side of the sloped curve is far from the spring. The curvature of one side of the sloped curve is greater than the curvature of the other side of the sloped curve.

[0003] This technical solution solves the problems of large size, heavy weight, and high friction of the original one-way clutch, and has a more compact structure, replacing the baffle with a rolling support structure.

[0004] However, the structure of this technical solution is still too complex. The machining accuracy requirements for the rolling support structure are no less than those for the curved groove. It is inconvenient to assemble, time-consuming, labor-intensive, and difficult to maintain.

[0005] In summary, existing one-way clutches have many parts, complex structures, and the torque transmitted by the clutch is geometrically proportional to its size, resulting in high costs. Furthermore, improper spring selection or inconsistent spring force among springs in the same group can easily lead to only some rollers working, increasing the probability of clutch failure. Summary of the Invention

[0006] The purpose of this invention is to provide a one-way clutch for a hub motor, which solves the problems of existing one-way clutches having many parts, complex structure, and inconvenient assembly and maintenance.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A one-way clutch for a hub motor includes an outer ring and an inner ring arranged concentrically. The outer ring and the inner ring are separate structures. The inner ring is fitted inside the outer ring. A rolling element is disposed between the outer wall of the inner ring and the inner wall of the outer ring. The outer wall of the inner ring is uniformly provided with multiple curved grooves, and the rolling element is disposed in the curved grooves.

[0009] The curved groove includes an interconnected release groove section and an engagement groove section. The release groove section is an arc groove, and the engagement groove section includes a slanted line section and a logarithmic spiral curve section, transitioning from the slanted line section to the logarithmic spiral curve section. The arc of the release groove section is connected to the slanted line section of the engagement groove section. The rolling element rolls from the release groove section to the engagement groove section with the relative movement between the outer ring and the inner ring, thereby gradually locking the inner ring and the outer ring together, and finally causing the outer ring to rotate with the inner ring. The rolling element rolls from the engagement groove section to the release groove section (31) with the relative movement between the outer ring and the inner ring until the rolling element rolls into the release groove, at which point the inner ring and the outer ring are unlocked, and the outer ring and the inner ring are in a state of independent movement.

[0010] The curved groove runs through the left and right sides of the outer wall of the inner ring; the rolling elements are rollers.

[0011] The arc of the disengagement groove is tangent to the oblique line of the engagement groove. This point of tangency is the wedging point between the curved groove and the roller. The roller rolls from the wedging point to the engagement groove, gradually locking the inner and outer rings together. The roller rolls from the wedging point to the disengagement groove, gradually unlocking the inner and outer rings together.

[0012] The radius of the detachment groove is 1.05-1.1 times the radius of the roller.

[0013] The maximum depth of the curved groove is 0.7-0.75 times the diameter of the roller. The lowest point of the curved groove is located in the detachment section, and the wedge point is higher than the lowest point of the curved groove.

[0014] The outer wall of the inner ring has at least 15 curved grooves, and a roller is installed in each curved groove.

[0015] The inner wall of the inner ring is provided with a keyway.

[0016] The inner ring has protective plates on both the left and right sides, and bolt holes are provided on both the left and right side walls of the inner ring. The protective plates on the left and right sides are fixed to the left and right sides of the inner ring by bolts respectively.

[0017] The advantages of this invention are as follows: 1. This invention eliminates the need for existing rolling element support frames and springs, achieving one-way clutch function through the design of the disengagement groove. 2. The unique arc-shaped disengagement and engagement groove design of the curved groove is a special groove formed by the combination of curved surfaces and straight lines at specific angles. The friction between the rolling element and the outer ring causes the rolling element to roll towards the engagement or disengagement groove, thereby locking or unlocking the outer and inner rings. A single curved groove achieves the functions of grooves, springs, and rolling element supports found in existing technologies, reducing the number of parts, facilitating installation, and lowering costs. 3. The engagement groove is designed with a logarithmic spiral curve, eliminating the need for springs in the rolling element's movement within the clutch. 4. This invention eliminates the need for springs and rolling element support structures, employing a structure similar to roller bearings. This facilitates the machining of the inner and outer rings of the clutch, ensuring good precision control. It utilizes a large number of rollers, resulting in a compact radial structure. During clutch operation, all rollers are simultaneously stressed, improving the clutch's torque transmission and significantly extending its service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a cross-sectional view of the present invention.

[0020] Figure 3 This is a schematic diagram of the inner ring structure of the present invention.

[0021] Figure 4 yes Figure 3 An enlarged structural diagram of the central circle portion.

[0022] Figure 5 This is a schematic diagram of the structure when the inner and outer rings are in the unlocked state in this invention.

[0023] Figure 6 This is a schematic diagram of the structure when the inner and outer rings are in a locked state in this invention.

[0024] In the diagram: 1-Outer ring; 12-Inner wall of outer ring; 2-Inner ring; 21-Outer wall of inner ring; 22-Inner wall of inner ring; 3-Curved groove; 31-Disengagement groove section; 32-Meshing groove section; 321-Sloping line section; 322-Logarithmic spiral curve section; 4-Roller; 5-Keyway; 6-Guard plate; 7-Wedge point; 8-Bolt hole. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0026] To simplify the description of this embodiment, some components that are well-known to those skilled in the art but are not related to the main content of this invention may be omitted in the accompanying drawings or description. Additionally, for ease of description, some components in the drawings may be omitted, enlarged, or reduced, but these do not represent the actual product dimensions or the complete structure.

[0027] The present invention provides a one-way clutch for a hub motor, such as... Figure 1 As shown, it includes an outer ring 1 and an inner ring 2 arranged concentrically. The outer ring 1 and the inner ring 2 are separate structures. The inner ring 2 is fitted inside the outer ring 1. A rolling element is arranged between the outer wall 21 of the inner ring and the inner wall 12 of the outer ring. The outer wall 21 of the inner ring is uniformly provided with multiple curved grooves 3, and the rolling element is arranged in the curved grooves 3.

[0028] Preferably, such as Figure 2 As shown, the curved groove 3 penetrates the left and right sides of the outer wall 21 of the inner ring; the rolling element is a roller 4, and the curved groove 3 does not require the rolling element support structure of the prior art.

[0029] Furthermore, protective plates 6 are provided on both the left and right sides of the inner ring 2, and bolt holes 8 are provided on both the left and right side walls of the inner ring 2. The protective plates 6 on the left and right sides are fixed to the left and right sides of the inner ring 2 by bolts, respectively. The protective plates 6 ensure that the roller 4 will not fall out of the curved groove 3.

[0030] like Figure 3 , Figure 4 As shown, the curved groove 3 is not a regular arc; it includes an interconnected release groove section 31 and an engagement groove section 32. The release groove section 31 is an arc groove, and the depth between the lowest point of the release groove section 31 and the inner wall 12 of the outer ring is greater than the diameter of the roller 4. When the roller 4 is located within the release groove section 31, the outer ring 1 and the inner ring 2 are in an unlocked state, and the rotation of the outer ring 1 and the rotation of the inner ring 2 do not interfere with each other.

[0031] Preferably, the radius of the arc of the detachment from the groove 31 is 1.05-1.1 times the radius of the roller 4.

[0032] like Figure 4 As shown, the meshing groove section 32 includes a sloping section 321 and a logarithmic spiral curve section 322. The sloping section 321 is a very short transition section, from which the groove transitions to the logarithmic spiral curve section 322. Thus, as the groove extends from the sloping section 321 to the logarithmic spiral curve section 322, the depth between the bottom of the meshing groove section 32 and the inner wall 12 of the outer ring gradually decreases in a gradient and becomes smaller than the diameter of the roller 4. When the roller 4 rolls into the logarithmic spiral curve section 322, it is wedged between the inner ring 2 and the outer ring 1 to transmit torque. As the roller 4 weds tighter, the outer ring 1 and the inner ring 2 are gradually locked together, and eventually the outer ring 1 rotates with the inner ring 2.

[0033] like Figure 4As shown, the arc of the disengagement groove 31 connects to the inclined line segment 321 of the engagement groove 32. The arc of the disengagement groove 31 is tangent to the inclined line segment 321 of the engagement groove 32. This tangency point is the wedging point 7 between the curved groove 3 and the roller 4. At the wedging point 7, the depth between the bottom of the engagement groove 32 and the inner wall 12 of the outer ring is equal to the diameter of the roller 4. Extending from the wedging point 7 towards the logarithmic spiral curve segment 322, the depth between the bottom of the engagement groove 32 and the inner wall 12 of the outer ring decreases in a certain gradient. This design of the engagement groove 32 eliminates the need for the springs of the prior art in the one-way clutch of the present invention. When the outer ring 1 and the inner ring 2 are locked, the roller 4 will not roll in the opposite direction, but will only be tightly wedged between the bottom of the engagement groove 32 and the inner wall 12 of the outer ring as the inner ring 2 rotates.

[0034] The maximum depth of the curved groove 3 is 0.7-0.75 times the diameter of the roller 4, such as... Figure 4 As shown, the lowest point of the curved groove 3 is located at the disengagement groove section 31, and the wedge point 7 is higher than the lowest point of the curved groove 3.

[0035] As the rolling element moves relative to the outer ring 1 and the inner ring 2, it rolls from the disengagement groove 31 towards the engagement groove 32, gradually locking the inner ring 2 and the outer ring 1 together, ultimately causing the outer ring 1 to rotate following the inner ring 2; Figure 6 As shown, when the inner ring 2 rotates in the direction from the engagement groove section 32 toward the disengagement groove section 31, it drives the roller 4 to roll in the direction of the engagement groove section 32. The roller 4 rolls from the wedging point 7 toward the engagement groove section 32 and gradually weds into the space between the bottom of the engagement groove section 32 and the inner wall 12 of the outer ring, thereby gradually locking the inner ring 2 and the outer ring 1 together, and finally causing the outer ring 1 to rotate with the inner ring 2.

[0036] As the rolling element moves relative to the outer ring 1 and the inner ring 2, it rolls from the engagement groove 32 towards the disengagement groove 31 until it enters the disengagement groove 31. At this point, the inner ring 2 unlocks from the outer ring 1, and the outer ring 1 and inner ring 2 move independently. Figure 5 As shown, when the inner ring 2 rotates along the direction from the disengagement groove 31 toward the engagement groove 32, it drives the roller 4 to roll toward the disengagement groove 31. The roller 4 rolls from the engagement groove 32 toward the wedge point 7 and finally rolls into the disengagement groove 31. When the roller 4 rolls into the disengagement groove 31, because the depth between the lowest point of the disengagement groove 31 and the inner wall 12 of the outer ring is greater than the diameter of the roller 4, the inner ring 2 and the outer ring 1 are completely unlocked, and the outer ring 1 and the inner ring 2 move independently. The rotation of the inner ring 2 no longer affects the outer ring 1.

[0037] Furthermore, the outer wall 21 of the inner ring is provided with at least 15 curved grooves 3, and a roller 4 is provided in each curved groove 3.

[0038] The inner wall 22 of the inner ring is provided with a keyway 5.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes and modifications made within the scope of the claims of this invention should be considered within the technical scope of this invention.

Claims

1. A one-way clutch for a hub motor, comprising an outer ring (1) and an inner ring (2) arranged concentrically, the outer ring (1) and the inner ring (2) being a separable structure, the inner ring (2) being fitted inside the outer ring (1), and a rolling element being disposed between the outer wall (21) of the inner ring and the inner wall (12) of the outer ring; characterized in that: Multiple curved grooves (3) are evenly arranged on the outer wall (21) of the inner ring, and the rolling element is arranged in the curved groove (3); The curved groove (3) includes a disengagement groove section (31) and an engagement groove section (32) that are connected to each other. The disengagement groove section (31) is a circular arc groove. The engagement groove section (32) includes a sloping line section (321) and a logarithmic spiral curve section (322), and transitions from the sloping line section (321) to the logarithmic spiral curve section (322). The circular arc of the disengagement groove section (31) is connected to the sloping line section (321) of the engagement groove section (32). The rolling element moves with the relative motion between the outer ring (1) and the inner ring (2). The inner ring (2) rolls from the disengagement groove (31) towards the engagement groove (32), thereby gradually locking the outer ring (1) together, and finally causing the outer ring (1) to rotate with the inner ring (2). The rolling element rolls from the engagement groove (32) towards the disengagement groove (31) with the relative movement between the outer ring (1) and the inner ring (2) until the rolling element rolls into the disengagement groove (31), at which point the inner ring (2) and the outer ring (1) are unlocked, and the outer ring (1) and the inner ring (2) move independently.

2. The one-way clutch for the hub motor according to claim 1, characterized in that: The curved groove (3) runs through the left and right sides of the outer wall (21) of the inner ring; the rolling element is a roller (4).

3. The one-way clutch for the hub motor according to claim 2, characterized in that: The arc of the disengagement groove (31) is tangent to the oblique line segment (321) of the engagement groove (32), and the point of tangency is the wedging point (7) of the curved groove (3) and the roller (4); the roller (4) rolls from the wedging point (7) to the engagement groove (32), so that the inner ring (2) and the outer ring (1) are gradually locked; the roller (4) rolls from the wedging point (7) to the disengagement groove (31), so that the inner ring (2) and the outer ring (1) are gradually unlocked.

4. The one-way clutch for the hub motor according to claim 3, characterized in that: The radius of the detachment groove (31) is 1.05-1.1 times the radius of the roller (4).

5. The one-way clutch for the hub motor according to claim 3, characterized in that: The maximum depth of the curved groove (3) is 0.7-0.75 times the diameter of the roller (4). The lowest point of the curved groove (3) is located in the detachment groove section (31), and the wedge point (7) is higher than the lowest point of the curved groove (3).

6. The one-way clutch for the hub motor according to claim 2, characterized in that: The outer wall (21) of the inner ring is provided with at least 15 curved grooves (3), and a roller (4) is provided in each curved groove (3).

7. The one-way clutch for the hub motor according to claim 1, characterized in that: A keyway (5) is provided on the inner wall (22) of the inner ring.

8. The one-way clutch for the hub motor according to claim 1, characterized in that: The inner ring (2) is provided with guard plates (6) on both the left and right sides. Bolt holes (8) are provided on both the left and right side walls of the inner ring (2). The guard plates (6) on the left and right sides are fixed to the left and right sides of the inner ring (2) respectively by bolts.

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