Single-stage gearbox

Abstract

The single-stage gearbox comprises a driving part end plate, a gearbox shell, an input shaft and an output shaft, the gearbox shell is installed on one side of the driving part end plate, a driving shaft is rotatably installed on the driving part end plate through a driving shaft bearing, one end of the input shaft is fixedly connected with the driving shaft, and the other end of the input shaft is fixedly connected with the output shaft. The other end of the input shaft is rotationally connected with the transmission shell through an input shaft bearing, and an input gear is fixed to the input shaft. One end of the output shaft is rotationally connected with the driving part end plate through an output shaft bearing, the other end of the output shaft is rotationally connected with the transmission shell through an output shaft bearing, an output gear is fixed to the output shaft, and the output gear is meshed with the input gear. One end of the input shaft is supported and connected through the driving shaft bearing, so that one bearing of the transmission is reduced, and the production cost of the single-stage transmission is reduced; and meanwhile, the structure of the transmission box body for supporting the bearing is reduced, and the miniaturization and lightweight design of the transmission is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and in particular to a single-stage transmission. Background Art

[0002] The transmission part of a single-stage transmission consists of an input shaft and an output shaft. The input shaft and the output shaft each have a gear that is integrated with the shaft, and the two gears have different numbers of teeth, thereby realizing the speed change function.

[0003] The existing single-stage transmission input shaft and output shaft each need a bearing for support and position limiting. A single-stage transmission needs four bearing support structures inside, which limits the miniaturization and lightweight design of the single-stage transmission. At the same time, the bearing is a component with a relatively high cost in a small transmission, and the structure of four bearings also limits the cost reduction.

[0004] Based on the above technical problems, the present application proposes a single-stage gearbox. Summary of the invention

[0005] The purpose of the present invention is to provide a single-stage gearbox to solve the technical problems mentioned in the background technology. The purpose of the present invention is achieved through the following technical solutions:

[0006] A single-stage gearbox comprises a driving member end plate, a transmission housing, an input shaft and an output shaft. The transmission housing is mounted on one side of the driving member end plate. The driving shaft is rotatably mounted on the driving member end plate via a driving shaft bearing. One end of the input shaft is fixedly connected to the driving shaft, and the other end of the input shaft is rotatably connected to the transmission housing via an input shaft bearing. An input gear is fixed to the input shaft. One end of the output shaft is rotatably connected to the driving member end plate via an output shaft bearing, and the other end of the output shaft is rotatably connected to the transmission housing via an output shaft bearing. An output gear is fixed to the output shaft, and the output gear meshes with the input gear.

[0007] Furthermore, an external spline is arranged at one end of the input shaft close to the driving shaft; a mounting groove is arranged at the end of the driving shaft, an internal spline is arranged on the inner wall of the mounting groove, and the internal spline cooperates with the external spline.

[0008] Furthermore, a positioning shaft head is fixed to one end of the input shaft close to the driving shaft, a positioning hole is provided at the bottom of the mounting groove, and the positioning shaft head is inserted into the positioning hole.

[0009] Furthermore, a drive shaft hole is opened on the end plate of the driving member, and the drive shaft is rotatably installed in the drive shaft hole through a drive shaft bearing, and an oil seal is arranged between the drive shaft and the drive shaft hole.

[0010] Furthermore, an output shaft hole is opened on the transmission housing, one end of the output shaft passes through the output shaft hole and extends out of the transmission housing, and an oil seal is arranged between the output shaft and the output shaft hole.

[0011] Furthermore, the input gear and the output gear are both helical gears, the input gear and the input shaft are integrally formed, and the output gear and the output shaft are integrally formed.

[0012] Furthermore, the input shaft bearing is a four-point angular contact bearing.

[0013] Furthermore, the output shaft bearing is a cylindrical roller bearing.

[0014] The technical solution provided in the embodiments of the present application has at least the following technical effects or advantages:

[0015] By supporting and connecting one end of the input shaft through the drive shaft bearing, one bearing of the transmission is reduced, thereby reducing the production cost of the single-stage transmission; at the same time, the structure of the transmission case used to support the bearing is also reduced, which is conducive to the miniaturization and lightweight design of the transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0018] Figure 2 for Figure 1 A partial enlarged view of

[0019] Figure 3 This is a schematic diagram of the end plate structure of the driving member of the embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the transmission housing structure of an embodiment of the present application;

[0021] Figure 5 This is a schematic diagram of the structure of the drive shaft and the input shaft of the embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of the output shaft structure of an embodiment of the present application.

[0023] Markings in the attached drawing: 1. Driving member end plate; 11. Driving shaft hole; 12. Output shaft bearing seat; 2. Transmission housing; 21. Input shaft bearing seat; 22. Output shaft hole; 3. Input shaft; 31. Input gear; 32. External spline; 33. Positioning shaft head; 34. Small retaining spring; 35. Large retaining spring; 4. Output shaft; 41. Output gear; 5. Input shaft bearing; 6. Driving shaft; 61. Mounting groove; 62. Internal spline; 63. Positioning hole; 7. Output shaft bearing; 8. Oil seal; 9. Driving shaft bearing. DETAILED DESCRIPTION

[0024] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the drawings and specific implementation methods of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1-Figure 6 A single-stage gearbox shown in the figure comprises a drive end plate 1, a transmission housing 2, an input shaft 3 and an output shaft 4. The transmission housing 2 is fastened to one side of the drive end plate 1 by means of a locking bolt, thereby forming a closed installation cavity between the drive end plate 1 and the transmission housing 2, and the input shaft 3 and the output shaft 4 are both installed in the installation cavity.

[0026] like Figure 1 , Figure 3 As shown, a driving shaft hole 11 penetrating the driving member end plate 1 is opened on the upper part of the driving member end plate 1, and an output shaft bearing seat 12 is fixed to the lower part of the right side of the driving member end plate 1. The output shaft bearing seat 12 and the driving member end plate 1 are integrally formed.

[0027] like Figure 1 , Figure 4 As shown, an input shaft bearing seat 21 is fixed to the upper portion of the left side of the transmission housing 2, the input shaft bearing seat 21 is coaxially arranged with the drive shaft hole 11, and the input shaft bearing seat 21 is integrally formed with the transmission housing 2. An output shaft hole 22 penetrating the transmission housing 2 is opened at the lower portion of the transmission housing 2, and the output shaft hole 22 is coaxially arranged with the output shaft bearing seat 12.

[0028] like Figure 1 As shown, the drive end plate 1 is a motor end plate, the motor rotor is installed on the left side of the drive end plate 1, and the drive shaft 6 of the motor is installed in the drive shaft hole 11 through the drive shaft bearing 9. When the motor is started, the electronic rotor drives the drive shaft 6 to rotate. Among them, an oil seal 8 is installed between the drive shaft 6 and the drive shaft hole 11 to block the gearbox from the outside air and prevent the lubricating oil in the gearbox from leaking.

[0029] like Figure 1 , Figure 2 , Figure 5As shown, an input gear 31 is integrally formed on the input shaft 3, an input shaft bearing 5 is installed on the right end of the input shaft 3 through a small retaining spring 34, and the left end of the input shaft bearing 5 is installed in the input shaft bearing seat 21 through a large retaining spring 35, and the small retaining spring 34 cooperates with the large retaining spring 35 to achieve axial limitation of the input shaft 3. The input shaft bearing 5 is a four-point angular contact bearing, and the inner ring (or outer ring) of the four-point contact ball bearing is precisely assembled from two half rings, and the groove curvature radius of its overall periphery (or inner ring) is very small, so that the steel ball and the inner and outer rings are in contact at four "points", which not only increases the radial load capacity, but also can withstand large axial loads in two directions with a compact size, and has a good axial limitation ability in two directions.

[0030] like Figure 1 , Figure 5 As shown, the left end of the input shaft 3 is formed with an external spline 32, and the right end of the drive shaft 6 is provided with a cylindrical mounting groove 61, which is coaxially arranged with the drive shaft 6, and the inner wall of the mounting groove 61 is formed with an internal spline 62 that matches the external spline 32. When the drive shaft 6 rotates, the torque is transmitted to the input shaft 3 through the internal spline 62 and the external spline 32.

[0031] like Figure 1 , Figure 5 As shown, a positioning shaft head 33 is also fixed to the left end of the input shaft 3. The positioning shaft head 33 is coaxial with the input shaft 3 and the outer diameter of the positioning shaft head 33 is smaller than the outer diameter of the input shaft 3. A chamfer is provided at the left end of the positioning shaft head 33. A positioning hole 63 is provided at the bottom of the mounting groove 61. The inner diameter of the positioning hole 63 matches the outer diameter of the positioning shaft head 33, and the depth of the positioning hole 63 is greater than the length of the positioning shaft head 33. The positioning shaft head 33 is inserted into the positioning hole 63 to achieve radial limiting of the input shaft 3.

[0032] like Figure 1 , Figure 6 As shown, an output gear 41 is integrally formed on the output shaft 4, and output shaft bearings 7 are respectively installed at both ends of the output shaft 4. The output shaft bearing 7 at the left end is installed on the output shaft bearing seat 12, and the output shaft bearing 7 at the right end is installed in the output shaft hole 22. The output gear 41 is meshed with the input gear 31, and the right end of the output shaft 4 is connected to the load. The torque of the input shaft 3 is transmitted to the output shaft 4 through the input gear 31 and the output gear 41, and is transmitted to the load after the speed change is completed. There is an oil seal 8 between the output shaft 4 and the output shaft hole 22 to block the gearbox from the outside air and prevent the lubricating oil in the gearbox from leaking.

[0033] The input gear 31 and the output gear 41 are both helical gears to obtain more stable speed change performance. The output shaft bearing 7 is a cylindrical roller bearing, and the cylindrical roller and the raceway are line contact bearings, which have the advantages of large load capacity, and the friction between the rolling body and the ring rib is small, which is suitable for high-speed rotation.

[0034] The technical solution provided in the embodiments of the present application has at least the following technical effects or advantages:

[0035] By supporting and connecting one end of the input shaft through the drive shaft bearing, one bearing of the transmission is reduced, thereby reducing the production cost of the single-stage transmission; at the same time, the structure of the transmission case used to support the bearing is also reduced, which is conducive to the miniaturization and lightweight design of the transmission.

[0036] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A single-stage gearbox, characterized in that: It includes a driving member end plate, a transmission housing, an input shaft and an output shaft, the transmission housing is installed on one side of the driving member end plate, the driving shaft is rotatably installed on the driving member end plate through a driving shaft bearing, one end of the input shaft is fixedly connected to the driving shaft, the other end of the input shaft is rotatably connected to the transmission housing through an input shaft bearing, and an input gear is fixed on the input shaft; one end of the output shaft is rotatably connected to the driving member end plate through an output shaft bearing, the other end of the output shaft is rotatably connected to the transmission housing through an output shaft bearing, an output gear is fixed on the output shaft, and the output gear meshes with the input gear.

2. A single-stage gearbox according to claim 1, characterized in that: An external spline is arranged at one end of the input shaft close to the drive shaft; a mounting groove is arranged at the end of the drive shaft, an internal spline is arranged on the inner wall of the mounting groove, and the internal spline cooperates with the external spline.

3. A single-stage gearbox according to claim 2, characterized in that: A positioning shaft head is fixed to one end of the input shaft close to the driving shaft, a positioning hole is formed at the bottom of the mounting groove, and the positioning shaft head is inserted into the positioning hole.

4. A single-stage gearbox according to claim 1, characterized in that: A driving shaft hole is provided on the end plate of the driving member. The driving shaft is rotatably mounted in the driving shaft hole through the driving shaft bearing. An oil seal is provided between the driving shaft and the driving shaft hole.

5. A single-stage gearbox according to claim 1, characterized in that: An output shaft hole is provided on the transmission housing, one end of the output shaft passes through the output shaft hole and extends out of the transmission housing, and an oil seal is provided between the output shaft and the output shaft hole.

6. A single-stage gearbox according to claim 1, characterized in that: The input gear and the output gear are both helical gears. The input gear is integrally formed with the input shaft, and the output gear is integrally formed with the output shaft.

7. A single-stage gearbox according to claim 1, characterized in that: The input shaft bearing is a four-point angular contact bearing.

8. A single-stage gearbox according to claim 1, characterized in that: The output shaft bearing is a cylindrical roller bearing.

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