One-way clutch and hub motor with gear

Abstract

The present invention discloses a one-way clutch, comprising an outer ring, an inner ring and a rolling support structure; the inner wall of the outer ring is provided with a plurality of curved grooves evenly arranged along the circumferential direction, the rolling support structure is arranged between the outer ring and the inner ring, the rolling support structure comprises a retaining frame, a needle roller and a spring, the retaining frame is provided with a plurality of retaining grooves evenly arranged along the circumferential direction, and the retaining grooves correspond to the curved grooves one by one; a needle roller and a spring are arranged in the retaining groove, the length directions of the needle roller and the spring both extend along the axial direction, and the spring is arranged on one side of the needle roller. The present invention also discloses a hub motor with a gear. The present invention adopts a structure similar to a needle roller bearing, with a large number of needle rollers, a small diameter, and a compact radial direction, which is conducive to reducing friction torque and extending service life.

Description

Technical Field

[0001] The invention relates to the technical field of motors, in particular to a small high-speed hub motor with gears for bicycles, and specifically to a one-way clutch and a hub motor with gears. Background Art

[0002] The existing bicycle small high-speed gear hub motor one-way clutch is composed of rollers, springs, curved grooves, inner ring, outer ring and left and right baffles. Due to the use of large diameter rollers, the one-way clutch has a large outer diameter, large volume, and heavy weight, and the friction between the left and right baffles and the inner ring is large, which is easy to cause damage. Summary of the invention

[0003] In order to solve the problems of large size, heavy weight and high friction of the one-way clutch of the small high-speed gear hub motor of the traditional bicycle, the present invention provides a one-way clutch, and the specific technical solution is as follows:

[0004] A one-way clutch comprises an outer ring, an inner ring and a rolling support structure;

[0005] The inner wall of the outer ring is provided with a plurality of curved grooves evenly arranged along the circumferential direction; the rolling support structure is arranged between the outer ring and the inner ring;

[0006] The rolling support structure includes a retaining frame, a needle roller and a spring. The retaining frame is provided with a plurality of retaining grooves evenly arranged along the circumferential direction, and the retaining grooves correspond one to one with the curved surface grooves. A needle roller and a spring are accommodated in the retaining grooves. The length directions of the needle roller and the spring both extend along the axial direction, and the spring is arranged on one side of the needle roller.

[0007] Furthermore, the radial cross-section of the curved groove is a sloped curve, one side of the sloped curve is close to the spring, the other side of the sloped curve is far from the spring, and the curvature of one side of the sloped curve is greater than the curvature of the other side of the sloped curve.

[0008] Furthermore, a keyway extending in the axial direction is provided on the inner wall of the inner ring.

[0009] Further, the spring is a V-shaped spring, the open end of the V-shaped spring faces the needle roller, and the closed end of the V-shaped spring is connected to the retaining frame;

[0010] Alternatively, the spring is a Z-shaped spring, one end of the Z-shaped spring is in contact with the needle roller, and the other end of the Z-shaped spring is connected to the retaining frame.

[0011] Furthermore, the maximum width of the V-shaped spring groove is smaller than the diameter of the needle roller.

[0012] Furthermore, the outer ring is a stamped part or a machined part.

[0013] Furthermore, the outer ring and the inner ring are inseparable.

[0014] Furthermore, it also includes at least two baffles, which are axially arranged on both sides of the inner ring and are used to clamp the inner ring.

[0015] Furthermore, the outer ring and the inner ring are separate structures.

[0016] The present invention also provides a hub motor with a gear, and the specific technical solution is as follows:

[0017] A hub motor with a gear comprises the one-way clutch mentioned above.

[0018] The implementation of the present invention has the following beneficial effects:

[0019] 1. The present invention adopts a structure similar to a needle roller bearing, with a large number of needle rollers, a small diameter, and a compact radial direction.

[0020] 2. The present invention adopts a structure similar to a needle roller bearing. Due to the reduction in the diameter of the needle roller, the friction between the flange of the outer ring and the end face of the inner ring is also reduced compared with the traditional one-way clutch, which is beneficial to reducing the friction torque and extending the service life.

[0021] 3. The present invention adopts the form of separating the inner and outer rings, and does not need to set a baffle, thus completely avoiding the friction between the baffle and the inner ring.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a radial cross-sectional view of a one-way clutch provided by an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a one-way clutch provided in an embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of an outer ring of a one-way clutch provided in an embodiment of the present invention;

[0027] Figure 4 It is a cross-sectional view of a gear hub motor provided in an embodiment of the present invention.

[0028] Among them, 1-outer ring, 2-inner ring, 3-curved groove, 4-cage, 5-needle roller, 6-spring, 7-keyway, 8-spindle, 9-hub shell, 10-motor power cord, 11-motor stator, 12-motor rotor, 13-bearing, 14-one-way clutch, 15-sun gear, 16-connecting parts. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, fixed connection, detachable connection, or integrated; mechanical connection, or electrical connection; direct connection, or indirect connection through an intermediate medium, or internal connection between two elements or interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example:

[0033] Figure 1 is a radial cross-sectional view of a one-way clutch provided by an embodiment of the present invention, Figure 2 is a schematic diagram of the structure of the one-way clutch provided by the embodiment of the present invention, please refer to Figure 1 and Figure 2 The one-way clutch provided in this embodiment includes an outer ring 1, an inner ring 2 and a rolling support structure; a plurality of curved grooves 3 uniformly arranged along the circumferential direction are provided on the inner wall of the outer ring 1; and a rolling support structure is provided between the outer ring 1 and the inner ring 2.

[0034] Please continue to refer to Figure 1and Figure 2 In an optional implementation of the present embodiment, a keyway 7 extending in the axial direction is provided on the inner wall of the inner ring 2, so that the inner ring 2 and the shaft can be fixedly connected together in the form of a key connection, such as a flat key, a spline, etc.

[0035] In another optional implementation of the present embodiment, the inner ring 2 is fixedly connected to the shaft in a non-key connection form, such as interference fit, pin connection, etc. In this case, no groove is provided on the inner wall of the inner ring 2.

[0036] Please continue to refer to Figure 1 The rolling support structure includes a cage 4, a needle roller 5 and a spring 6. The cage 4 is provided with a plurality of retaining grooves evenly arranged along the circumferential direction, and the retaining grooves correspond to the curved grooves 3 one by one. A needle roller 5 and a spring 6 are arranged in the retaining grooves. The length directions of the needle roller 5 and the spring 6 are both extended along the axial direction, and the spring 6 is arranged on one side of the needle roller 5. It should be pointed out that the one-way clutch provided in this embodiment adopts a structure similar to a needle roller bearing. Compared with the traditional one-way clutch using a roller design, the needle roller 5 has a large number and a small diameter, and is more compact in the radial direction.

[0037] Figure 3 This is a schematic diagram of the structure of the outer ring of the one-way clutch provided by an embodiment of the present invention. Figure 3 The radial cross-sectional shape of the curved groove 3 is a sloped curve, one side of the sloped curve is close to the spring 6, and the other side of the sloped curve is far away from the spring 6. The curvature of the one side of the sloped curve is greater than the curvature of the other side of the sloped curve. That is to say, the side of the sloped curve close to the spring 6 is relatively steeper and has a smaller curvature radius than the side far away from the spring 6.

[0038] Please continue to refer to Figure 1 The radial cross-section of the curved groove 3 is a sloped curve, and the spring 6 is arranged on the clockwise side of the needle roller 5. The spring 6 is a V-shaped spring, the open end of the V-shaped spring faces the needle roller 5, and the closed end of the V-shaped spring is connected to the retainer 4. The maximum width of the V-shaped spring is smaller than the diameter of the needle roller 5.

[0039] Alternatively, the spring 6 is a Z-shaped spring (not shown), one end of which contacts the needle roller 5, and the other end of which is connected to the retainer 4. It should be noted that those skilled in the art may also use other forms of springs according to actual needs, and this embodiment is not limited thereto.

[0040] Optionally, the outer ring 1 is a stamped part or a machined part.

[0041] In an optional implementation of this embodiment, the outer ring 1 is inseparable from the inner ring 2. The one-way clutch further includes a left baffle and a right baffle (not shown) arranged along the axial direction, the left baffle is arranged on one side of the inner ring 2, and the right baffle is arranged on the other side of the inner ring 2, and the left baffle and the right baffle are used to clamp the inner ring 2. Due to the reduction in the diameter of the needle roller 5, the friction between the flange of the outer ring 1 and the end face of the inner ring 2 is also reduced compared with the traditional one-way clutch, which is conducive to reducing the friction torque and extending the service life.

[0042] In a preferred implementation of this embodiment, the outer ring 1 and the inner ring 2 are separated structures. Since the inner and outer rings 1 are separated, the one-way clutch does not need to be provided with a baffle, so the friction between the baffle and the inner ring 2 can be completely avoided.

[0043] Please continue to refer to Figure 1 The working principle of the one-way clutch provided in this embodiment is as follows: the needle roller 5 is preloaded by the spring 6 to ensure continuous contact with the inner ring 2 and the outer ring 1. In the direction shown in the figure, when the outer ring 1 is fixed and the inner ring 2 has a tendency to rotate counterclockwise, the clutch is locked, and the inner and outer rings 1 cannot rotate relative to each other, but can rotate relative to each other; when the inner ring 2 is fixed and the outer ring 1 has a tendency to rotate clockwise, the clutch is locked, and the inner and outer rings 1 cannot rotate relative to each other, but can rotate relative to each other.

[0044] Example:

[0045] Figure 4 is a cross-sectional view of a hub motor with gears provided in an embodiment of the present invention, please refer to Figure 4 The geared hub motor provided in this embodiment includes a main shaft 8, a hub shell 9 rotatably mounted on the main shaft 8, a driving mechanism and a gear reduction mechanism arranged inside the hub shell 9. Preferably, a wire outlet hole is provided on the left side of the hub shell 9, and the left side of the hub shell 9 is an integral structure with the hub shell 9.

[0046] Alternatively, an end cover is provided on the left side of the hub shell 9, a wire outlet hole is provided on the end cover, and the end cover is connected to the hub shell 9 (not shown).

[0047] The motor power line 10 passes through the outlet hole and enters the inner cavity of the hub shell 9, and is connected to the winding outlet terminal of the inner stator.

[0048] The driving mechanism includes a coaxially arranged motor stator 11 and a motor rotor 12. The motor stator 11 is fixedly mounted on the main shaft. The motor rotor 12 includes a rotor part and a sleeve part. The rotor part is supported and mounted on the main shaft 8 by a bearing 13. The inner ring of the sleeve part is clearance-matched with the main shaft 8. The rotor part and the sleeve part are integrally formed, which is conducive to reducing the number of parts and components, improving the position of the rotor bearing and the concentricity of the sun gear, thereby improving the overall performance.

[0049] The gear reduction mechanism includes the one-way clutch 14, the double planetary gear, the planetary carrier assembly, the ring gear assembly and the sun gear 15 provided in the above embodiment. The sun gear 15 is sleeved on the outer ring of the sleeve part of the outer rotor, and the sun gear 15 is fixedly connected to the sleeve part through a connecting member 16.

[0050] For specific examples of the one-way clutch in this embodiment, reference may be made to the examples described in the above embodiments, and this embodiment will not be described in detail herein.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. A one-way clutch, characterized in that: It comprises an outer ring (1), an inner ring (2) and a rolling support structure; The inner wall of the outer ring (1) is provided with a plurality of curved grooves (3) uniformly arranged along the circumferential direction; the rolling support structure is arranged between the outer ring (1) and the inner ring (2); the radial cross-sectional shape of the curved groove (3) is a slope curve, one side of the slope curve is close to the spring (6), the other side of the slope curve is far from the spring (6), and the curvature of the one side of the slope curve is greater than the curvature of the other side of the slope curve; The rolling support structure comprises a retaining frame (4), a needle roller (5) and a spring (6); the retaining frame (4) is provided with a plurality of retaining grooves evenly arranged along the circumferential direction, and the retaining grooves correspond to the curved surface grooves (3) one by one; the retaining grooves contain a needle roller (5) and a spring (6); the length directions of the needle roller (5) and the spring (6) both extend along the axial direction, and the spring (6) is arranged on one side of the needle roller (5); the outer ring (1) and the inner ring (2) are separated structures.

2. The one-way clutch according to claim 1, characterized in that: The inner wall of the inner ring (2) is provided with a keyway (7) extending in the axial direction.

3. The one-way clutch according to claim 1, characterized in that: The spring (6) is a V-shaped spring, the open end of the V-shaped spring faces the needle roller (5), and the closed end of the V-shaped spring is connected to the retaining frame (4); Alternatively, the spring (6) is a Z-shaped spring, one end of the Z-shaped spring is in contact with the needle roller (5), and the other end of the Z-shaped spring is connected to the retaining frame (4).

4. The one-way clutch according to claim 3, characterized in that: The maximum width of the V-shaped spring groove is smaller than the diameter of the needle roller (5).

5. The one-way clutch according to claim 1, characterized in that: The outer ring (1) is a stamped part or a machined part.

6. The one-way clutch according to claim 1, characterized in that: The outer ring (1) and the inner ring (2) are inseparable.

7. The one-way clutch according to claim 6, characterized in that: It also comprises at least two baffles, which are axially arranged on both sides of the inner ring (2) and are used to clamp the inner ring (2).

8. A gear hub motor, characterized in that: It comprises the one-way clutch described in any one of claims 1-7.

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