Auxiliary variable-speed transmission mechanism, transmission system and tractor
By designing the secondary variable speed transmission mechanism, the coordination of the meshing sleeve and gears is used to realize the switching of the high, medium and low three-speed gears of the tractor, solving the problem of insufficient gears in the existing technology, meeting a variety of operational needs and improving installation convenience.
Patent Information
- Application Number
- CN202421921048.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The existing small horsepower tractor sub-speed transmission mechanism has only two gears, which cannot meet multiple operating requirements, and the existing engagement sleeve cannot achieve multi-speed switching.
A secondary variable speed transmission mechanism is designed, including a first shaft and a second shaft, and a low gear, mid gear and high gear driving gear are provided on the shaft. The meshing sleeve is cooperated with the passive gear, so that the high, medium and low gear control is achieved by controlling the movement of the meshing sleeve.
The switch between high, medium and low gears is achieved, meeting a variety of operating requirements, reducing friction and facilitating installation and disassembly.
Smart Images
Figure CN223136842U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tractor transmission systems, in particular to a sub-transmission mechanism, a transmission system and a tractor. Background Art
[0002] At present, the demand for tractors is increasing. Generally, the sub-transmission of existing small-horsepower tractors has two gears, namely a high-speed range and a low-speed range. Usually, the existing method sometimes cannot meet various operation requirements. At the same time, in order to achieve gear shifting, a sliding sleeve needs to be arranged between the high-speed gear and the low-speed gear. The sliding sleeve meshes with the high-speed gear and the low-speed gear respectively to realize the switching between the high-speed gear and the low-speed gear. When the number of gears exceeds two, a single sliding sleeve cannot achieve the switching of multiple gears. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a sub-transmission mechanism, a transmission system and a tractor to solve the above problems existing in the prior art.
[0004] The technical solution of the utility model to solve the above technical problem is as follows: A sub-transmission mechanism includes a box body, a first shaft and a second shaft. The first shaft and the second shaft are rotatably arranged in the box body. The first shaft and the second shaft are parallel and arranged at intervals. A low-speed driving gear, a medium-speed driving gear and a high-speed driving gear that rotate synchronously with the first shaft are sequentially arranged at intervals on the first shaft. A low-speed driven gear, a medium-speed driven gear and a high-speed driven gear are sequentially rotatably arranged at intervals on the second shaft. The low-speed driven gear meshes with the low-speed driving gear. The medium-speed driven gear meshes with the medium-speed driving gear. The high-speed driven gear meshes with the high-speed driving gear. A first engaging seat is sleeved on the second shaft between the low-speed driven gear and the medium-speed driven gear through a spline. A second engaging seat is sleeved on the second shaft between the medium-speed driven gear and the high-speed driven gear through a spline. A first engaging sleeve is sleeved on the first engaging seat. A second engaging sleeve is sleeved on the second engaging seat. The first engaging sleeve, the first engaging seat, the second engaging sleeve and the second engaging seat can all rotate synchronously with the second shaft. The first engaging sleeve can slide along the length direction of the first engaging seat to engage with the low-speed driven gear or the medium-speed driven gear. The second engaging sleeve can slide along the length direction of the second engaging seat to engage with the high-speed driven gear.
[0005] The beneficial effects of the present utility model are as follows: By separately controlling the movement of the first engaging sleeve on the first engaging seat and the movement of the second engaging sleeve on the second engaging seat, the low-speed driven gear, the medium-speed driven gear, and the high-speed driven gear are respectively synchronized with the rotation of the second shaft, thereby realizing the control of three gears of high, medium, and low speeds and meeting various operating requirements of the auxiliary transmission mechanism.
[0006] On the basis of the above technical solution, the present utility model can also be improved as follows.
[0007] Further, the low-speed driven gear, the medium-speed driven gear, and the high-speed driven gear are respectively sleeved on the second shaft through gear bearings.
[0008] The beneficial effect of adopting the above further solution is that the low-speed driven gear, the medium-speed driven gear, and the high-speed driven gear are respectively sleeved on the second shaft through gear bearings, reducing the friction between the low-speed driven gear, the medium-speed driven gear, and the high-speed driven gear and the second shaft during idling.
[0009] Further, one end of the second shaft is installed in the box body through a first bearing, and the other end of the second shaft is installed in the box body through a bearing seat. Two inclined surface bearings are arranged in parallel between the bearing seat and the second shaft, and a plurality of adjusting washers are arranged between the inner rings of the two inclined surface bearings.
[0010] The beneficial effect of adopting the above further solution is that by adjusting the number of adjusting washers during installation, the distance between the inner rings of the two inclined surface bearings is realized, thereby realizing the adjustment of the rotational torque of the second shaft.
[0011] Further, the bearing mounting seat is fixed in the box body by bolts.
[0012] The beneficial effect of adopting the above further solution is that the installation and disassembly are convenient.
[0013] Further, both ends of the first shaft are respectively rotatably installed in the box body through second bearings.
[0014] The beneficial effect of adopting the above further solution is to ensure the stability of the rotation of the first shaft.
[0015] Further, a first annular stop block is provided in the middle of the first shaft. The medium-speed driving gear and the high-speed driving gear are arranged between the first annular stop block and one of the second bearings. The medium-speed driving gear and the high-speed driving gear are respectively sleeved on the first shaft through splines, and a spacer sleeve is arranged between the medium-speed driving gear and the high-speed driving gear. The spacer sleeve is used to respectively press the mutually remote ends of the medium-speed driving gear and the high-speed driving gear against the first annular stop block and the second bearing.
[0016] The beneficial effects of adopting the above further scheme are as follows: It is convenient for the disassembly and installation of the medium-speed driving gear and the high-speed driving gear, and the spacer sleeve can prevent the axial displacement of the medium-speed driving gear and the high-speed driving gear.
[0017] Furthermore, a spline connection sleeve is sleeved on one end of the first shaft, and the spline connection sleeve is synchronously rotationally connected to the first shaft.
[0018] The beneficial effects of adopting the above further scheme are as follows: The setting of the spline connection sleeve can facilitate the connection between the first shaft and the power source.
[0019] Furthermore, a circlip is provided between the spline connection sleeve and the first shaft to prevent the spline connection sleeve from disengaging from the first shaft.
[0020] The beneficial effects of adopting the above further scheme are as follows: The setting of the circlip can prevent the spline connection sleeve from disengaging from the first shaft.
[0021] The present utility model also provides a transmission system for solving the above technical problems, including the auxiliary transmission mechanism described above.
[0022] The present utility model also provides a tractor for solving the above technical problems, including the transmission system described above.
[0023] The beneficial effects of adopting the above scheme are as follows: Both shifting meshes are sleeved on the second shaft. By respectively controlling the movement of the first engaging sleeve on the first engaging seat and the movement of the second engaging sleeve on the second engaging seat, the synchronous rotation of the low-speed driven gear, the medium-speed driven gear, and the high-speed driven gear with the second shaft is realized, so as to realize the control of high, medium, and low three gears and meet various operation requirements of the auxiliary transmission mechanism. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 is a structural schematic diagram of the present utility model;
[0025] In the drawings, the list of components represented by each reference numeral is as follows:
[0026] 1. First shaft, 2. Second shaft; 3. Low-speed driving gear; 4. Medium-speed driving gear; 5. High-speed driving gear; 6. Low-speed driven gear; 7. Medium-speed driven gear; 8. High-speed driven gear; 9. First engaging seat; 10. Second engaging seat; 11. First engaging sleeve; 12. Second engaging sleeve; 13. Gear bearing; 14. First bearing; 15. Bearing seat; 16. Tapered bearing; 17. Adjusting washer; 18. Second bearing; 19. First annular block; 20. Spacer sleeve; 21. Spline connection sleeve; 22. Circlip. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.
[0028] Embodiment 1
[0029] As Figure 1 shown, the present utility model discloses a secondary speed transmission mechanism, including a box body (not shown in the attached drawings), a first shaft 1 and a second shaft 2. The first shaft 1 and the second shaft 2 are rotatably arranged in the box body. The first shaft 1 and the second shaft 2 are parallel and arranged at intervals. Specifically, both ends of the first shaft 1 are rotatably installed in the box body through second bearings 18. One end of the second shaft 2 is installed in the box body through a first bearing 14, and the other end of the second shaft 2 is installed in the box body through a bearing seat 15. Between the bearing seat 15 and the second shaft 2, two inclined surface bearings 16 are arranged in parallel. Between the inner rings of the two inclined surface bearings 16, a number of adjusting washers 17 are provided. By adjusting the number of the adjusting washers 17 during the installation process, the distance between the inner rings of the two inclined surface bearings 16 is realized, so as to realize the adjustment of the rotational torque of the second shaft 2. The bearing mounting seat is fixed in the box body by bolts to facilitate the disassembly and installation of the bearing mounting seat.
[0030] On the first shaft 1, a low-speed driving gear 3, a medium-speed driving gear 4 and a high-speed driving gear 5 that rotate synchronously with the first shaft 1 are sequentially arranged at intervals. In this embodiment, the low-speed driving gear 3 is integrally and fixedly arranged on the first shaft 1.
[0031] In this embodiment, on the second shaft 2, a low-speed driven gear 6, a medium-speed driven gear 7 and a high-speed driven gear 8 are sequentially arranged at intervals and rotatably. Specifically, the low-speed driven gear 6, the medium-speed driven gear 7 and the high-speed driven gear 8 are respectively sleeved on the second shaft 2 through gear bearings 13. The low-speed driven gear 6, the medium-speed driven gear 7 and the high-speed driven gear 8 are respectively sleeved on the second shaft 2 through gear bearings 13, reducing the friction between the low-speed driven gear 6, the medium-speed driven gear 7, the high-speed driven gear 8 and the second shaft 2 during idling.
[0032] The low-speed passive gear 6 meshes with the low-speed active gear 3, the medium-speed passive gear 7 meshes with the medium-speed active gear 4, and the high-speed passive gear 8 meshes with the high-speed active gear 5. A first engagement seat 9 is sleeved on the second shaft 2 between the low-speed passive gear 6 and the medium-speed passive gear 7 through a spline. A second engagement seat 10 is sleeved on the second shaft 2 between the medium-speed passive gear 7 and the high-speed passive gear 8 through a spline. A first engagement sleeve 11 is sleeved on the first engagement seat 9, and a second engagement sleeve 12 is sleeved on the second engagement seat 10. The first engagement sleeve 11, the first engagement seat 9, the second engagement sleeve 12, and the second engagement seat 10 can all rotate synchronously with the second shaft 2. The first engagement sleeve 11 can slide along the length direction of the first engagement seat 9 to engage with the low-speed passive gear 6 or the medium-speed passive gear 7, and the second engagement sleeve 12 can slide along the length direction of the second engagement seat 10 to engage with the high-speed passive gear 8.
[0033] In this embodiment, a first annular stop block 19 is provided in the middle of the first shaft 1. The medium-speed active gear 4 and the high-speed active gear 5 are arranged between the first annular stop block 19 and one of the second bearings 18. The medium-speed active gear 4 and the high-speed active gear 5 are respectively sleeved on the first shaft 1 through splines, and a spacer sleeve 20 is provided between the medium-speed active gear 4 and the high-speed active gear 5. The spacer sleeve 20 is used to respectively press the mutually remote ends of the medium-speed active gear 4 and the high-speed active gear 5 against the first annular stop block 19 and the second bearing 18, which facilitates the disassembly and installation of the medium-speed active gear 4 and the high-speed active gear 5. The spacer sleeve 20 can prevent the axial displacement of the medium-speed active gear 4 and the high-speed active gear 5.
[0034] In this embodiment, a spline connection sleeve 21 is sleeved on one end of the first shaft 1. The spline connection sleeve 21 is rotationally connected to the first shaft 1 synchronously. A circlip 22 is provided between the spline connection sleeve 21 and the first shaft 1 to prevent the spline connection sleeve 21 from detaching from the first shaft 1. Specifically, an annular groove is provided on the first shaft 1, and a corresponding inner annular groove is provided on the inner wall of the spline connection sleeve 21. When the spline connection sleeve 21 is installed on the first shaft 1, the annular groove and the inner annular groove are correspondingly arranged and communicated, and the circlip 22 is arranged in the annular groove and the inner annular groove.
[0035] Working principle:
[0036] Low-speed subtransmission: Operate the shifting mechanism so that the first engagement sleeve 11 simultaneously engages with the low-speed passive gear and the first engagement seat 9, and the second engagement sleeve 12 only engages with the second engagement seat 10.
[0037] The transmission route is: power source → spline connecting sleeve 21 → first shaft 1 → low gear driven gear 6 → first engaging sleeve 11 → first engaging seat 9 → second shaft 2.
[0038] For the intermediate gear of the auxiliary transmission: Operate the shifting mechanism so that the first engaging sleeve 11 engages with the intermediate gear driven gear 7 and the first engaging seat 9 simultaneously, and the second engaging sleeve 12 only engages with the second engaging seat 10.
[0039] The transmission route is: power source → spline connecting sleeve 21 → first shaft 1 → intermediate gear driven gear 7 → first engaging sleeve 11 → first engaging seat 9 → second shaft 2.
[0040] For the high gear of the auxiliary transmission: Operate the shifting mechanism so that the first engaging sleeve 11 only engages with the first engaging seat 9, and the second engaging sleeve 12 engages with the second engaging seat 10 and the high gear driven gear 8 simultaneously.
[0041] The transmission route is: power source → spline connecting sleeve 21 → first shaft 1 → high gear driven gear 8 → second engaging sleeve 12 → second engaging seat 10 → second shaft 2.
[0042] Embodiment 2
[0043] This embodiment discloses a transmission system, including the auxiliary transmission mechanism described in Embodiment 1 above.
[0044] Embodiment 3
[0045] This embodiment discloses a tractor, including the transmission system described in Embodiment 2 above.
[0046] The present utility model realizes the synchronous rotation of the low gear driven gear 6, the intermediate gear driven gear 7, and the high gear driven gear 8 with the second shaft 2 respectively by controlling the movement of the first engaging sleeve 11 on the first engaging seat 9 and the movement of the second engaging sleeve 12 on the second engaging seat 10 respectively, thereby realizing the control of three gears of high, medium, and low, and meeting various operation requirements of the auxiliary transmission mechanism.
[0047] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0048] In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0049] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0050] 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 connection with the embodiment or example are included in at least one embodiment or example of the present utility model. 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, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0051] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A secondary speed change transmission mechanism, characterized in that, It includes a box body, a first shaft (1) and a second shaft (2). The first shaft (1) and the second shaft (2) are rotatably arranged in the box body. The first shaft (1) and the second shaft (2) are parallel and arranged at intervals. On the first shaft (1), a low-speed driving gear (3), a medium-speed driving gear (4) and a high-speed driving gear (5) that rotate synchronously with the first shaft (1) are successively arranged at intervals; on the second shaft (2), a low-speed driven gear (6), a medium-speed driven gear (7) and a high-speed driven gear (8) are successively arranged rotatably at intervals. The low-speed driven gear (6) meshes with the low-speed driving gear (3), the medium-speed driven gear (7) meshes with the medium-speed driving gear (4), and the high-speed driven gear (8) meshes with the high-speed driving gear (5). On the second shaft (2) between the low-speed driven gear (6) and the medium-speed driven gear (7), a first engaging seat (9) is sleeved through a spline. On the second shaft (2) between the medium-speed driven gear (7) and the high-speed driven gear (8), a second engaging seat (10) is sleeved through a spline. A first engaging sleeve (11) is sleeved on the first engaging seat (9), and a second engaging sleeve (12) is sleeved on the second engaging seat (10). The first engaging sleeve (11), the first engaging seat (9), the second engaging sleeve (12) and the second engaging seat (10) can all rotate synchronously with the second shaft (2). The first engaging sleeve (11) can slide along the length direction of the first engaging seat (9) to engage with the low-speed driven gear (6) or the medium-speed driven gear (7), and the second engaging sleeve (12) can slide along the length direction of the second engaging seat (10) to engage with the high-speed driven gear (8).
2. The secondary speed change transmission mechanism according to claim 1, characterized in that, The low-speed driven gear (6), the medium-speed driven gear (7) and the high-speed driven gear (8) are respectively sleeved on the second shaft (2) through gear bearings (13).
3. A secondary speed change transmission mechanism according to claim 1, characterized in that, One end of the second shaft (2) is installed in the box body through a first bearing (14), and the other end of the second shaft (2) is installed in the box body through a bearing seat (15). Between the bearing seat (15) and the second shaft (2), two inclined surface bearings (16) are arranged in parallel. Between the inner rings of the two inclined surface bearings (16), a plurality of adjusting washers (17) are arranged.
4. A secondary speed change transmission mechanism according to claim 3, characterized in that, The bearing mounting seat is fixed in the box body by bolts.
5. A secondary speed change transmission mechanism according to any one of claims 1 to 4, characterized in that, Both ends of the first shaft (1) are rotatably installed in the box body through second bearings (18).
6. A secondary speed change transmission mechanism according to claim 5, characterized in that, A first annular stopper (19) is provided in the middle of the first shaft (1). The middle-speed drive gear (4) and the high-speed drive gear (5) are arranged between the first annular stopper (19) and one of the second bearings (18). The middle-speed drive gear (4) and the high-speed drive gear (5) are respectively sleeved on the first shaft (1) through splines, and a spacer sleeve (20) is provided between the middle-speed drive gear (4) and the high-speed drive gear (5). The spacer sleeve (20) is used to respectively press the mutually remote ends of the middle-speed drive gear (4) and the high-speed drive gear (5) against the first annular stopper (19) and the second bearing (18).
7. A secondary speed change transmission mechanism according to any one of claims 1 to 4, characterized in that, A spline connection sleeve (21) is sleeved on one end of the first shaft (1), and the spline connection sleeve (21) is synchronously rotationally connected to the first shaft (1).
8. A secondary transmission mechanism according to claim 7, characterized in that, A circlip (22) is provided between the spline connection sleeve (21) and the first shaft (1) to prevent the spline connection sleeve (21) from detaching from the first shaft (1).
9. A drive system, characterized in that, It includes the auxiliary speed change transmission mechanism according to any one of claims 1 to 8.
10. A tractor, characterized in that, It includes the transmission system according to claim 9.