A gear transmission assembly and a gear box

Abstract

The utility model discloses a gear drive assembly and gear box, include: fixed base, fixed base has contact surface, gear, gear is equipped with center hole, and center hole is along the axial direction and penetrates gear, along the axial direction, gear and fixed base interval arrangement, axial limiting device is equipped with arc convex, connecting portion, along the axial direction, connecting portion has first end and second end, and arc convex is located at first end, and with contact surface point contact, connecting portion is located in center hole, and the inner wall interference fit of center hole, and the end surface of first end is flush with the upper surface of gear. The utility model can solve the problem of axial movement and big friction in the operation process of gear.

Description

Technical Field

[0001] This utility model relates to the field of gear transmission technology, and in particular to a gear transmission assembly and gearbox. Background Technology

[0002] Gear transmission is one of the most common transmission methods in modern machinery, widely used in various industrial equipment, automobiles, aerospace, and other fields. In common gearbox designs, a certain clearance is usually reserved between the end face of the gear and the gearbox housing to ensure that the gear avoids contact with the housing during rotation, thereby reducing unnecessary friction. However, this design often overlooks the axial force generated by the gear when it operates at high speed or under alternating loads. Due to the lack of an effective axial positioning and limiting mechanism, the gear is prone to axial movement during operation.

[0003] This axial movement causes the gear end face to collide with the housing, generating not only a harsh impact noise but also creating a large area of ​​surface or boundary friction between them. This friction significantly increases the load and energy loss of the transmission system and causes abnormal wear in the contact area. After long-term operation, it may lead to damage to the gear tooth surface, housing wear, or even failure, severely reducing the reliability, efficiency, and service life of the gear transmission system.

[0004] Therefore, there is a need for a gear transmission assembly and gearbox that can suppress axial movement of gears and maintain low frictional resistance during gear operation. Utility Model Content

[0005] The purpose of this invention is to solve the problems of axial movement and high friction during gear operation.

[0006] To solve the above-mentioned technical problems, the present invention discloses a gear transmission assembly, comprising: a fixed base having a contact surface; a gear having a central hole through which the gear passes in an axial direction; the gear being spaced apart from the fixed base along the axial direction; an axial limiting device having an arc-shaped protrusion and a connecting portion, the connecting portion having a first end along the axial direction, the arc-shaped protrusion being disposed at the first end and making point contact with the contact surface; the connecting portion being disposed within the central hole, the connecting portion being interference-fitted with the inner wall of the central hole, and the end face of the first end being flush with the upper surface of the gear.

[0007] By employing the above technical solution, an axial limiting device is installed between the fixed base and the gear. One part of the axial limiting device is interference-fitted with the gear, while the surface of the other part contacts the fixed base, filling the gap between the fixed base and the gear. This creates an axial constraint on the gear, effectively limiting its axial displacement during operation and preventing contact between the gear and the fixed base, thus achieving axial positioning of the gear. Because the connecting part is interference-fitted with the center hole, the gear rotation drives the axial limiting device to rotate, forming a point contact structure with the fixed base through the arc-shaped protrusion. When the gear rotates, this point contact replaces the surface contact between the gear and the fixed base in existing technologies, reducing frictional resistance and improving transmission efficiency. By setting the end face of the first end of the connecting part flush with the upper surface of the gear, it is easy to accurately determine whether the connecting part is properly installed.

[0008] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a gear transmission assembly, wherein the arc-shaped protrusion is hemispherical.

[0009] According to another specific embodiment of the present invention, the present invention discloses a gear transmission assembly, wherein the axial limiting device further includes an extension portion, the extension portion extending along the axial direction, one end of the extension portion being connected to the arc-shaped protrusion, and the other end being connected to the first end.

[0010] By adopting the above technical solution and adding an extension that extends axially, the axial distance between the fixed base and the gear can be adapted without changing the size of the arc protrusion. Compared with changing the diameter of the arc protrusion to adapt to the distance between the fixed base and the gear, if the distance between the two is large, the diameter of the arc protrusion needs to be increased accordingly to meet the distance requirements. This will result in a decrease in the curvature of the arc protrusion and an overly flat arc surface, which may change the point contact between the arc protrusion and the fixed base into a surface contact, increasing frictional resistance and wear risk.

[0011] According to another specific embodiment of the present invention, a gear transmission assembly is disclosed, wherein the cross-sectional area of ​​the extension is larger than the cross-sectional area of ​​the connecting part, and the other end of the extension has a limiting surface, which is in contact with the upper surface of the gear.

[0012] By adopting the above technical solution, the cross-sectional area of ​​the extension is set to be larger than that of the connecting part, and a limiting surface is formed at its end to fit against the upper surface of the gear. The limiting surface further limits the gear axially to prevent the gear from moving axially.

[0013] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a gear transmission assembly, wherein the contact surface is a plane.

[0014] By adopting the above technical solution, the stability of the point contact position with the arc-shaped protrusion is ensured by setting the contact surface as a plane. Compared with the curved surface structure, the planar structure can effectively maintain the point contact state when the arc-shaped protrusion deflects. For example, when the arc-shaped protrusion deflects, it may make line contact or surface contact with the curved contact surface, thereby increasing the frictional resistance and aggravating wear.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a gear transmission assembly, which further includes a gear shaft, a part of which is located in the central hole and is clearance-fitted with the central hole; another part of the gear shaft protrudes from the gear and is located on the side of the gear away from the fixed base; the connecting part has a second end, and along the axial direction, the gear shaft and the second end are spaced apart.

[0016] By adopting the above technical solution, and by setting the second end of the gear shaft and the connecting part to be spaced apart, collisions, impacts and friction wear caused by contact between the gear shaft and the connecting part are avoided, thereby reducing operating noise and energy loss.

[0017] According to another specific embodiment of the present invention, a gear transmission assembly is disclosed, wherein the second end is provided with a chamfer.

[0018] By adopting the above technical solution, a chamfer can be set at the second end of the connecting part to effectively guide the connecting part into the center hole of the gear, avoiding jamming or damage to components caused by edge interference during assembly.

[0019] According to another specific embodiment of the present invention, a gear transmission assembly is disclosed, wherein the arc-shaped protrusion, the extension, and the connecting part are integrally formed.

[0020] By adopting the above technical solution, the arc-shaped protrusion, extension and connecting part are made into an integral structure, which improves the integrity and structural strength of the axial limiting device, eliminates the assembly error and connection gap in the split design, and ensures that the force transmission path is more direct and reliable.

[0021] An embodiment of this utility model also discloses a gearbox, comprising: a gear transmission assembly as described in any of the above embodiments; and a housing, wherein the fixed base of the gear transmission assembly is fixedly mounted on the housing. Attached Figure Description

[0022] Figure 1 This diagram shows a structural schematic of the gearbox according to an embodiment of the present invention.

[0023] Figure 2 This shows a front view of the gear transmission assembly according to an embodiment of the present invention;

[0024] Figure 3 Show Figure 2 The gear transmission assembly shown is a cross-sectional view along the AA direction;

[0025] Figure 4 Show Figure 3 An enlarged schematic diagram of section D in the middle;

[0026] Figure 5 This shows a front view of a gear transmission assembly including an extension according to an embodiment of the present invention;

[0027] Figure 6 Show Figure 5 The gear transmission assembly shown is a cross-sectional view along the BB direction;

[0028] Figure 7 A perspective view of the axial limiting device according to an embodiment of the present invention is shown. Attached image description:

[0030] Gear transmission assembly 100;

[0031] Fixed base 110; Contact surface 111;

[0032] Gear 120; Center hole 121; First hole 1211; Second hole 1212; Upper surface 122;

[0033] Axial limiting device 130; arc-shaped protrusion 131; connecting part 132; first end 1321; end face 13211; second end 1322; chamfer 1323; extension part 133; limiting surface 1331;

[0034] Gear shaft 140;

[0035] Gearbox 200;

[0036] Casing 210. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0038] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model 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 the utility model.

[0040] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0041] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0043] refer to Figure 1This application provides a gearbox 200, including: a gear transmission assembly 100 and a housing 210. The gear transmission assembly 100 includes a fixed base 110, which is fixedly mounted on the housing 210.

[0044] For ease of subsequent description, the X direction is first defined by way of example in this application embodiment. For example... Figure 2 As shown, the X direction is the axial direction of the center hole 121.

[0045] refer to Figure 2 , Figure 3 The gear transmission assembly 100 further includes: a gear 120, an axial limiting device 130, and a gear shaft 140. The fixed base 110 has a contact surface 111. In this embodiment, the contact surface 111 is a plane. In some possible implementations, the contact surface 111 may include, but is not limited to, a plane, and can achieve point contact with the arc-shaped protrusion 131; for example, the contact surface 111 may be a curved surface, an arc surface, etc.

[0046] By setting the contact surface 111 as a plane, the stability of the point contact position with the arc-shaped protrusion 131 is ensured. Compared with the curved surface structure, the planar structure can effectively maintain the point contact state when the arc-shaped protrusion 131 deflects. For example, when the arc-shaped protrusion 131 deflects, it may make line contact or surface contact with the curved contact surface 111, thereby increasing the frictional resistance and aggravating wear.

[0047] refer to Figure 2 , Figure 3 In this embodiment, the gear 120 is provided with a central hole 121, and the central hole 121 is along the axial direction ( Figure 2 The gear 120 is axially spaced from the fixed base 110. In this embodiment, the central hole 121 is a stepped hole with a variable diameter, including a first hole 1211 and a second hole 1212. The connecting part 132 is disposed in the first hole 1211, and the gear shaft 140 is disposed in the second hole 1212. The cross-sectional area of ​​the second hole 1212 is larger than that of the first hole 1211. In some possible embodiments, the central hole 121 can be a through hole of equal diameter, that is, the cross-sectional area of ​​the first hole 1211 is equal to the cross-sectional area of ​​the second hole 1212; the cross-sectional area of ​​the second hole 1212 can also be smaller than that of the first hole 1211. As long as the first hole 1211 can ensure an interference fit between the connecting part 132 and the central hole 121, the gear shaft 140 can be disposed in the second hole 1212. The specific shape of the central hole 121 is not limited in this application.

[0048] refer to Figure 2 , Figure 3In this embodiment, the axial limiting device 130 is provided with an arc-shaped protrusion 131 and a connecting portion 132. Along the axial direction, the connecting portion 132 has a first end 1321 and a second end 1322, which are located at opposite ends of the connecting portion 132 along the axial direction. The arc-shaped protrusion 131 is provided at the first end 1321 and makes point contact with the contact surface 111. The connecting portion 132 is provided in the central hole 121, and the connecting portion 132 is press-fitted with the inner wall of the first hole 1211 of the central hole 121. The end face 13211 of the first end 1321 is flush with the upper surface 122 of the gear 120.

[0049] By providing an axial limiting device 130 between the fixed base 110 and the gear 120, a portion of the axial limiting device 130 is interference-fitted with the gear 120, while the other portion contacts the fixed base 110, filling the gap between the fixed base 110 and the gear 120. This creates an axial constraint on the gear 120, effectively limiting its axial displacement during operation and preventing contact between the gear 120 and the fixed base 110, thus achieving axial positioning of the gear 120. Since the connecting portion 132 is interference-fitted with the center hole 121, the rotation of the gear 120 drives the axial limiting device 130 to rotate, forming a point contact structure with the fixed base 110 through the arc-shaped protrusion 131. When the gear 120 rotates, this point contact replaces the surface contact between the gear 120 and the fixed base 110 in the prior art, reducing frictional resistance caused by contact and improving transmission efficiency. By setting the end face 13211 of the first end 1321 of the connecting part 132 to be flush with the upper surface 122 of the gear 120, it is easy to accurately determine whether the connecting part 132 is installed in place.

[0050] In some possible implementations, the axial limiting device 130 is made of a material that is hard, lightweight and wear-resistant, such as plastic, alloy or composite material, which can further reduce the frictional resistance and operating noise between the device and the fixed base 110 while ensuring the limiting function.

[0051] refer to Figure 2 , Figure 3 In this embodiment, the arc-shaped protrusion 131 is hemispherical, and the radius of the arc-shaped protrusion 131 is a( Figure 3 As shown in Figure a), the distance between the fixed base 110 and the upper surface 122 of the gear 120 is b. Figure 3As shown in Figure b), the radius a of the arc-shaped protrusion 131 is equal to the distance b, and b > 0. The cross-sectional area of ​​the arc-shaped protrusion 131 is larger than the cross-sectional area of ​​the connecting portion 132, and one end of the arc-shaped protrusion 131 is in contact with the upper surface 122 of the gear 120. In some possible embodiments, the arc-shaped protrusion 131 has an arc-shaped surface that can make point contact with the contact surface 111, including but not limited to a hemisphere, which can be a spherical cap, ellipsoid, parabola, etc., and is not limited here. The distance b between the fixed base 110 and the upper surface 122 of the gear 120 includes but is not limited to the radius a of the arc-shaped protrusion 131, and can be greater than or less than the radius a, depending on the specific shape of the arc-shaped protrusion 131. The cross-sectional area of ​​the arc-shaped protrusion 131 includes but is not limited to being greater than the cross-sectional area of ​​the connecting portion 132, and can be equal to or less than the cross-sectional area of ​​the connecting portion 132.

[0052] refer to Figure 2 , Figure 3 In this embodiment, a portion of the gear shaft 140 is located within the central hole 121, clearance-fitted with the second hole 1212 of the central hole 121, and spaced apart from the second end 1322 along the axial direction; another portion of the gear shaft 140 protrudes from the gear 120 and is located on the side of the gear 120 away from the fixed base 110. In some possible embodiments, the gear shaft 140 may also be interference-fitted with the second hole 1212 of the central hole 121.

[0053] By setting the gear shaft 140 and the second end 1322 of the connecting part 132 at intervals, collisions, impacts and friction wear caused by contact between the gear shaft 140 and the connecting part 132 are avoided, thereby reducing operating noise and energy loss.

[0054] refer to Figure 3 , Figure 4 In this embodiment, the second end 1322 of the axial limiting device 130 is provided with a chamfer 1323. By providing a chamfer 1323 at the second end 1322 of the connecting part 132, the connecting part 132 can be effectively guided into the center hole 121 of the gear 120, avoiding jamming or damage to components due to edge interference during assembly.

[0055] refer to Figure 5 , Figure 6In this embodiment, the axial limiting device 130 further includes an extension 133, which extends axially. One end of the extension 133 is connected to the arc-shaped protrusion 131, and the other end is connected to the first end 1321. The extension 133 is cylindrical, and its diameter is the same as that of the arc-shaped protrusion 131. In some possible implementations, the shape of the extension 133 may include, but is not limited to, a cylinder, and may be a cuboid, a frustum, a body of revolution, etc., as long as its shape can accommodate the spacing b. This application does not impose any limitations on this aspect. The cross-sectional area of ​​the extension 133 may be the same as that of the arc-shaped protrusion 131, and may be larger or smaller than the cross-sectional area of ​​the arc-shaped protrusion 131. This application does not impose any limitations on this aspect either.

[0056] By adding an axially extending extension 133, the axial distance between the fixed base 110 and the gear 120 can be accommodated while maintaining the same size of the arc-shaped protrusion 131. Compared to Figure 2 , Figure 3 In the embodiment shown, the diameter of the arc-shaped protrusion 131 is changed to adapt to the distance between the fixed base 110 and the gear 120. If the distance between the two is large, the diameter of the arc-shaped protrusion 131 will increase accordingly to meet the distance requirement. This will result in a decrease in the curvature of the arc-shaped protrusion 131 and an overly gentle arc surface, which may cause the point contact between the arc-shaped protrusion 131 and the fixed base 110 to become a surface contact, increasing frictional resistance and wear risk.

[0057] refer to Figure 5 , Figure 6 In this embodiment, the cross-sectional area of ​​the extension 133 is larger than that of the connecting portion 132. The other end of the extension 133 has a limiting surface 1331, which is in contact with the upper surface 122 of the gear 120. By setting the cross-sectional area of ​​the extension 133 to be larger than that of the connecting portion 132, and forming a limiting surface 1331 at its end that is in contact with the upper surface 122 of the gear 120, the limiting surface 1331 further limits the gear 120 axially, preventing the gear 120 from moving axially.

[0058] In some possible implementations, the cross-sectional area of ​​the extension 133 is less than or equal to the cross-sectional area of ​​the connecting portion 132, so as to adaptively fill the gap b between the contact surface 111 and the upper surface 122 of the gear 120.

[0059] refer to Figure 7 In this embodiment, the arc-shaped protrusion 131, the extension 133, and the connecting portion 132 are integrally formed. In some possible implementations, the arc-shaped protrusion 131, the extension 133, and the connecting portion 132 can be connected by means of welding, bonding, riveting, or threaded connection.

[0060] By adopting the above technical solution, the arc-shaped protrusion 131, the extension 133 and the connecting part 132 are made into an integral structure, which improves the integrity and structural strength of the axial limiting device 130, eliminates the assembly error and connection gap in the split design, and ensures that the force transmission path is more direct and reliable.

[0061] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A gear transmission assembly, characterized in that, include: Fixed base with contact surface; A gear has a central hole that extends through the gear in an axial direction; the gear and the fixed base are spaced apart along the axial direction. An axial limiting device is provided with an arc-shaped protrusion and a connecting part. Along the axial direction, the connecting part has a first end, and the arc-shaped protrusion is located at the first end and makes point contact with the contact surface. The connecting part is located in the central hole and is interference-fitted with the inner wall of the central hole. The end face of the first end is flush with the upper surface of the gear.

2. The gear transmission assembly as described in claim 1, characterized in that, The arc-shaped protrusion is hemispherical.

3. The gear transmission assembly as described in claim 1, characterized in that, The axial limiting device further includes: An extension extends along the axial direction, with one end of the extension connected to the arcuate protrusion and the other end connected to the first end.

4. The gear transmission assembly as described in claim 3, characterized in that, The cross-sectional area of ​​the extension is larger than that of the connecting part, and the other end of the extension has a limiting surface that fits against the upper surface of the gear.

5. The gear transmission assembly as described in claim 1, characterized in that, The contact surface is a plane.

6. The gear transmission assembly as described in claim 1, characterized in that, Also includes: The gear shaft has one part located inside the central hole and in clearance fit with the central hole; the other part protrudes from the gear and is located on the side of the gear away from the fixed base. The connecting portion has a second end, and along the axial direction, the gear shaft is spaced apart from the second end.

7. The gear transmission assembly as described in claim 6, characterized in that, The second end has a chamfer.

8. The gear transmission assembly as described in claim 3, characterized in that, The arc-shaped protrusion, extension, and connecting part are integrally formed.

9. A gearbox, characterized in that, include: The gear transmission assembly as described in any one of claims 1 to 8; The housing, wherein the fixed base in the gear transmission assembly is fixedly mounted on the housing.

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