Gear and spline combined transmission structure

Abstract

The utility model discloses a gear and spline combined transmission structure, belongs to the technical field of mechanical transmission, and solves the technical problem that a gear train structure of an existing gear chamber is difficult to assemble and disassemble. The gear chamber comprises a gear chamber body and a gear chamber cover, a driven gear is arranged in the gear chamber body, a first center shaft is arranged on one side of the driven gear, a first bearing is arranged on the outer wall of the first center shaft in a sleeved mode, a first installation counter bore used for installing the first bearing is formed in the gear chamber body, and an installation hole coaxial with the first installation counter bore is formed in the gear chamber body or the gear chamber cover. An internal spline is arranged in the first central shaft; the external spline is matched with the internal spline, the external spline is inserted into the internal spline, and the external spline is connected with a driven part shaft used for transmitting power out of the gear chamber from the gear chamber. The center shaft is arranged on the driven gear, the internal spline is arranged in the center shaft, the center shaft is installed in the gear chamber through the bearing, power is transmitted out through the spline, the structure is simple, and assembly and disassembly are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, and more specifically, it relates to a combined transmission structure of a gear and a spline. Background Art

[0002] Gear transmission is an important type of mechanical transmission, which has the characteristics of high transmission accuracy, high efficiency, and flexible layout.

[0003] Generally, a gear train is arranged in a closed cavity such as a gear chamber, lubricated by pressure and splash, and its cleanliness and safety are ensured. When it is necessary to transmit power from the cavity to the outside of the cavity, generally, a hole larger than the outer diameter of the driven gear is opened on the cavity. The driven gear is first installed on the shaft of the driven component, and then inserted into the hole to mesh with the driving gear in the cavity. Or a large and a small hole are opened on both sides of the cavity. The shaft of the driven component is first inserted into the small hole, the driven component is installed, and the driven gear is placed from the large hole on the other side, sleeved on the shaft, and tightened with the shaft to achieve meshing with the driving gear.

[0004] In the prior art, the gear chamber needs to be opened with a large hole or two holes. The former has requirements for the overall layout space, and the latter is troublesome to process. The other hole is a process hole and needs to be sealed. Moreover, it is difficult to assemble and disassemble in the prior art. In addition, if helical gears are used, an axial force is formed on the shaft of the driven component, which is not applicable to some components. The driven gear is installed at the shaft end, forming a cantilever, which is easily deformed by force and affects the transmission accuracy. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is in view of the above deficiencies of the prior art. The purpose of the utility model is to provide a combined transmission structure of a gear and a spline that is convenient for assembly and disassembly.

[0006] The technical solution of the utility model is: a combined transmission structure of a gear and a spline, including a gear chamber and a gear chamber cover covering the gear chamber. A driven gear is arranged in the gear chamber. A first central shaft is arranged on one side of the driven gear. A first bearing is sleeved on the outer wall of the first central shaft. A first installation counterbore for installing the first bearing is arranged in the gear chamber. The gear chamber or the gear chamber cover is provided with an installation hole coaxial with the first installation counterbore. An internal spline is arranged in the first central shaft; it further includes an external spline cooperating with the internal spline. The external spline is inserted into the internal spline, and the external spline is connected with a driven component shaft for transmitting power from the inside of the gear chamber to the outside of the gear chamber.

[0007] As a further improvement, an interference fit is provided between the first bearing and the first central shaft.

[0008] Further, a clearance fit or an interference fit is provided between the first bearing and the first installation counterbore.

[0009] Further, a first relief groove is provided at the connection between the passive gear and the first central shaft, and one side of the first bearing extends into the first relief groove.

[0010] Further, a second central shaft is provided on the other side of the passive gear. The second central shaft is coaxial with the first central shaft. A second bearing is sleeved on the outer wall of the second central shaft. A second mounting counterbore for mounting the second bearing is provided on the inner wall of the gear chamber cover. The internal spline passes through the second central shaft.

[0011] Further, an interference fit is provided between the second bearing and the second central shaft.

[0012] Further, a clearance fit or a transition fit is provided between the second bearing and the second mounting counterbore.

[0013] Further, a second relief groove is provided at the connection between the passive gear and the second central shaft, and one side of the second bearing extends into the second relief groove.

[0014] Further, the second central shaft has the same structure as the first central shaft, and the second bearing has the same structure as the first bearing.

[0015] Further, both the first bearing and the second bearing are deep groove ball bearings.

[0016] Beneficial Effects

[0017] Compared with the prior art, the present utility model has the following advantages:

[0018] In the present utility model, a central shaft is provided on the passive gear, an internal spline is provided in the central shaft, and the central shaft is installed in the gear chamber through bearings. Only mounting holes need to be provided in the gear chamber or the gear chamber cover, and power is transmitted from the mounting holes through the splines. During installation, the external spline is inserted into the internal spline of the gear through the mounting hole. The structure is simple and the installation and disassembly are convenient. Description of the Drawings

[0019] Figure 1 is a schematic structural view of the present utility model;

[0020] Figure 2 is a schematic structural view of the passive gear in the present utility model;

[0021] Figure 3 is Figure 2 a cross-sectional view taken along the A - A direction of

[0022] Wherein: 1 - gear chamber, 2 - gear chamber cover, 3 - driven gear, 4 - first central shaft, 5 - first bearing, 6 - first mounting counterbore, 7 - mounting hole, 8 - internal spline, 9 - external spline, 10 - shaft of the driven component, 11 - first relief groove, 12 - second central shaft, 13 - second bearing, 14 - second mounting counterbore, 15 - second relief groove. Detailed implementation manner

[0023] The following further describes the present utility model with specific embodiments in the accompanying drawings.

[0024] Refer to Figures 1 to 3 , a combined gear and spline transmission structure, including a gear chamber 1 and a gear chamber cover 2 covering the gear chamber 1. A driven gear 3 is provided in the gear chamber 1. A first central shaft 4 is provided on one side of the driven gear 3. A first bearing 5 is sleeved on the outer wall of the first central shaft 4. A first mounting counterbore 6 for mounting the first bearing 5 is provided in the gear chamber 1. A mounting hole 7 coaxial with the first mounting counterbore 6 is provided on the gear chamber 1 or the gear chamber cover 2. An internal spline 8 is provided in the first central shaft 4. The transmission structure further includes an external spline 9 cooperating with the internal spline 8. The external spline 9 is inserted into the internal spline 8. The external spline 9 is connected with a shaft 10 of the driven component for transmitting power from inside the gear chamber 1 to outside the gear chamber 1. During installation, the external spline 9 can be inserted into the internal spline 8 of the driven gear 3 through the mounting hole 7. The structure is simple and the installation and disassembly are convenient.

[0025] Specifically, an interference fit is provided between the first bearing 5 and the first central shaft 4. A clearance fit or an interference fit is provided between the first bearing 5 and the first mounting counterbore 6, which plays a supporting role.

[0026] A first relief groove 11 is provided at the connection between the driven gear 3 and the first central shaft 4. One side of the first bearing 5 extends into the first relief groove 11, making the installation structure of the entire driven gear 3 more compact.

[0027] Further, a second central shaft 12 is provided on the other side of the driven gear 3. The second central shaft 12 is coaxial with the first central shaft 4. A second bearing 13 is sleeved on the outer wall of the second central shaft 12. A second mounting counterbore 14 for mounting the second bearing 13 is provided on the inner wall of the gear chamber cover 2. The internal spline 8 passes through the second central shaft 12. An interference fit is provided between the second bearing 13 and the second central shaft 12. A clearance fit or an interference fit is provided between the second bearing 13 and the second mounting counterbore 14. A second relief groove 15 is provided at the connection between the driven gear 3 and the second central shaft 12. One side of the second bearing 13 extends into the second relief groove 15. The second central shaft 12 has the same structure as the first central shaft 4, and the second bearing 13 has the same structure as the first bearing 5. Both the first bearing 5 and the second bearing 13 are deep groove ball bearings. Supported by two bearings, the stability is better.

[0028] The above is only the preferred embodiment of the present utility model. It should be pointed out that for those skilled in the art, without departing from the structure of the present utility model, several modifications and improvements can still be made, and these will not affect the implementation effect of the present utility model and the practicality of the patent.

Claims

1. A gear and spline combined transmission structure, comprising a gear chamber (1), and a gear chamber cover (2) covering the gear chamber (1), wherein a passive gear (3) is arranged in the gear chamber (1), characterized in that: A first central shaft (4) is provided on one side of the passive gear (3), a first bearing (5) is sleeved on the outer wall of the first central shaft (4), a first mounting countersunk hole (6) for mounting the first bearing (5) is provided in the gear chamber (1), a mounting hole (7) coaxial with the first mounting countersunk hole (6) is provided in the gear chamber (1) or the gear chamber cover (2), an internal spline (8) is provided in the first central shaft (4), and an external spline (9) matching with the internal spline (8) is also included, the external spline (9) is inserted into the internal spline (8), and the external spline (9) is connected to a driven component shaft (10) for transmitting power from the gear chamber (1) to the outside of the gear chamber (1).

2. A gear and spline combined transmission structure according to claim 1, characterized in that: The first bearing (5) and the first central shaft (4) are in interference fit.

3. A gear and spline combined transmission structure according to claim 1, characterized in that: The first bearing (5) and the first mounting counterbore (6) are in a clearance fit or a transition fit.

4. A gear and spline combined transmission structure according to claim 1, characterized in that: A first clearance groove (11) is provided at the connection between the driven gear (3) and the first central shaft (4), and one side of the first bearing (5) extends into the first clearance groove (11).

5. A gear and spline combined transmission structure according to any one of claims 1 to 4, characterized in that: A second center shaft (12) is provided on the other side of the passive gear (3), the second center shaft (12) is coaxial with the first center shaft (4), a second bearing (13) is sleeved on the outer wall of the second center shaft (12), a second mounting countersunk hole (14) for mounting the second bearing (13) is provided on the inner wall of the gear chamber cover (2), and the internal spline (8) passes through the second center shaft (12).

6. A gear and spline combined transmission structure according to claim 5, characterized in that: The second bearing (13) and the second central shaft (12) are in interference fit.

7. The gear and spline combined transmission structure according to claim 5, characterized in that: The second bearing (13) and the second mounting counterbore (14) are in a clearance fit or a transition fit.

8. The gear and spline combined transmission structure according to claim 5, characterized in that: A second clearance groove (15) is provided at the connection between the driven gear (3) and the second central shaft (12), and one side of the second bearing (13) extends into the second clearance groove (15).

9. The gear and spline combined transmission structure according to claim 5, characterized in that: The second central shaft (12) has the same structure as the first central shaft (4), and the second bearing (13) has the same structure as the first bearing (5).

10. The gear and spline combined transmission structure according to claim 5, characterized in that: The first bearing (5) and the second bearing (13) are both deep groove ball bearings.

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