Micro-miniature front PTO transmission case structure and tractor with micro-miniature front PTO transmission case structure
By designing the micro-scale front PTO transmission box structure, the problem of the lack of matching transmission box for small and medium-sized tractors is solved, the clutch and sealing structure are optimized, and the stability and rationality of power transmission are achieved.
Patent Information
- Application Number
- CN202420059554.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-10
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-01-10
AI Technical Summary
Small and medium-sized tractors lack matching miniaturized front PTO transmission boxes, which cannot meet the driving requirements under complex operating conditions.
A small front PTO transmission box structure is designed, including the box, input gear shaft, oil pump, hydraulic cylinder, clutch plate set and output shaft. The clutch plate set is driven by the hydraulic pressure of the hydraulic cylinder to achieve power transmission and optimize the clutch and sealing structure.
It fills the defects of the PTO transmission box of the small tractor without matching miniaturization, optimizes the clutch structure and sealing structure, and achieves effective power transmission and stability.
Smart Images
Figure CN222277443U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tractor transmission boxes, in particular to a micro-sized front PTO transmission box structure and a tractor with the same. Background Art
[0002] Nowadays, small and medium-sized tractors have transformed towards a multi-functional direction. To meet the needs of complex working conditions such as garden weeding and rotary tillage, the front PTO has become a standard feature of multi-functional small and medium-sized tractors.
[0003] However, the front PTO transmission box matched with medium-sized tractors is basically mature and can meet the needs of driving agricultural machinery for daily garden farming tasks, but micro and small tractors do not have such transmission box configuration.
[0004] Based on this, need to develop a kind of and micro, small tractor front PTO transmission box. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide a micro-sized front PTO transmission box structure and a tractor having the same, which effectively overcomes the defects of the prior art.
[0006] The technical solution of the utility model to solve the above technical problems is as follows:
[0007] A miniature front PTO transmission box structure comprises a box body, an input gear shaft, an oil pump, a hydraulic cylinder, a clutch plate group and an output shaft, wherein one end of the input gear shaft is rotatably mounted in the box body, one end of the output shaft is rotatably mounted in the box body and is parallel to the input gear shaft, one end of the input gear shaft is coaxially fixedly equipped with a driving gear, one end of the output shaft is coaxially and rotatably equipped with a driven gear, the driving gear is meshed with the driven gear, one end of the driven gear is coaxially fixed with a circular mounting portion, the clutch plate is assembled in the mounting portion, the clutch plate group is respectively connected to the mounting portion and the output shaft, the hydraulic cylinder is fixedly mounted at one end of the output shaft, and has a circular piston coaxially distributed with the output shaft, and the piston is close to the mounting portion, the oil pump is mounted on the box body, and is connected to the piston cavity of the hydraulic cylinder through an oil circuit, and a breather connected to its inner cavity is provided on the top of the box body.
[0008] On the basis of the above technical solution, the present invention can also be improved as follows.
[0009] Furthermore, the clutch plate group includes a plurality of first friction plates and a plurality of second friction plates, which are coaxially sleeved on the output shaft respectively, the outer edges of the plurality of first friction plates are keyed to the inner wall of the mounting portion and can slide axially, the inner edges of the plurality of second friction plates are keyed to the output shaft and can slide axially, the plurality of first friction plates and the plurality of second friction plates are staggeredly distributed along the axial direction, and the piston is used to move axially and extend into the mounting portion so that the plurality of first friction plates and the plurality of second friction plates are abutted against each other.
[0010] Furthermore, one end of the input gear shaft passes through one end of the housing and extends into a first assembly groove adapted to the other end of the housing, and the first assembly groove and one end of the housing are both rotatably assembled with the input gear shaft through a first bearing; one end of the output shaft passes through the other end of the housing and extends into a second assembly groove adapted to one end of the housing, and the second assembly groove and the other end of the housing are both rotatably assembled with the output shaft through a second bearing; the driven gear is mounted on the output shaft through a third bearing.
[0011] Furthermore, the output shaft is provided with an assembly section with an increased diameter, and the mounting portion is located at the periphery of the assembly section.
[0012] Furthermore, the hydraulic cylinder comprises the annular piston and an annular cylinder body, the cylinder body is coaxially sleeved on one end of the output shaft and close to one end of the assembly section, an annular groove is defined on the end of the cylinder body close to the assembly section, the piston is coaxially sleeved on the inner wall of the annular groove, the outer edge of the piston is provided with a sealing portion which is in sealing contact with the outer edge of the cylinder body, the piston cavity is formed between the piston and the annular groove, the end of the piston close to the assembly section is provided with an annular protrusion, one end of the assembly section is concavely provided with an assembly groove, a spring is sleeved in the assembly groove, and the spring abuts against the end of the piston.
[0013] Furthermore, a first annular notch is provided at the inner edge of one end of the cylinder body away from the assembly section, a second annular notch is provided at a position on the output shaft corresponding to the first annular notch, a retaining ring is embedded in both the first and second annular notches, and the retaining ring includes two semicircular retaining plates.
[0014] Furthermore, an annular sealing groove is provided at the end of the outer wall of the annular groove, and an annular sealing portion embedded in the sealing groove is provided at one end of the piston away from the assembly section.
[0015] Furthermore, the oil circuit includes a first oil circuit and a second oil circuit, one end of the first oil circuit passes through the inner wall of the annular groove from the inside of the output shaft and enters from the bottom of the piston cavity, the other end of the first oil circuit extends to the surface of one end of the output shaft, the second oil circuit is arranged inside one end of the box body, one end of which extends to the surface of the box body and is connected and communicated with the oil pump, and the other end of the second oil circuit extends to connect and communicate with the other end of the first oil circuit.
[0016] Furthermore, a respirator baffle is provided on the top wall of the box body corresponding to the position below the respirator.
[0017] The utility model has the beneficial effects of reasonable structural design, filling the defect that the current small tractor has no matching miniaturized front PTO transmission box, and optimizing the clutch structure and the sealing structure.
[0018] A tractor is also provided, comprising a micro front PTO transmission box structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the micro-sized front PTO transmission box structure of the utility model;
[0020] Figure 2 It is a structural schematic diagram of the hydraulic cylinder in the micro-sized front PTO transmission box structure of the utility model.
[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0022] 1. Housing; 2. Input gear shaft; 3. Oil pump; 4. Hydraulic cylinder; 5. Clutch plate group; 6. Output shaft; 7. Passive gear; 8. Breather; 9. Retaining ring; 41. Piston; 42. Cylinder body; 71. Mounting part; 81. Breather baffle; 411. Protrusion; 412. Annular sealing part. DETAILED DESCRIPTION
[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0024] Example 1
[0025] like Figure 1As shown, the micro-sized front PTO transmission box structure of this embodiment includes a box body 1, an input gear shaft 2, an oil pump 3, a hydraulic cylinder 4, a clutch plate group 5 and an output shaft 6. One end of the input gear shaft 2 is rotatably mounted on the upper part of the box body 1, and one end of the output shaft 6 is rotatably mounted on the lower part of the box body 1 and is parallel to the input gear shaft 2. One end of the input gear shaft 2 is coaxially fixedly equipped with a driving gear, and one end of the output shaft 6 is coaxially rotatably equipped with a driven gear 7. The driving gear is meshed with the driven gear 7, and the driven gear 7 has an annular mounting portion 71 coaxially fixed at one end, the clutch plate group 5 is mounted in the mounting portion 71, and the clutch plate group 5 is connected to the mounting portion 71 and the output shaft 6 respectively. The hydraulic cylinder 4 is fixedly mounted at one end of the output shaft 6, and has an annular piston 41 coaxially distributed with the output shaft 6, and the piston 41 is close to the mounting portion 71. The oil pump 3 is mounted at the lower end of the housing 1 and is connected to the piston cavity of the hydraulic cylinder 4 through an oil circuit. A breather 8 connected to its inner cavity is provided on the top of the housing 1.
[0026] Here’s how it works:
[0027] The engine drives the input gear shaft 2 to rotate, and the active gear on the input gear shaft 2 drives the passive gear 7 to rotate. When the oil pump 3 does not supply oil, the clutch plate group 5 does not work, the passive gear 7 idles, and the output shaft 6 has no power output. When the oil pump 3 supplies oil, the piston 41 of the hydraulic cylinder 4 moves toward the mounting portion 71 and extends into it under the action of oil pressure, thereby pressing the clutch plate group 5. At this time, the output shaft 6 and the passive gear 7 are linked, and the passive gear 7 drives the output shaft 6 to rotate to achieve power transmission. The entire transmission box structure is reasonably designed, which fills the defect that the current small tractor has no matching miniaturized front PTO transmission box, and optimizes the clutch structure and sealing structure.
[0028] In this embodiment, the clutch plate group 5 includes a plurality of first friction plates and a plurality of second friction plates, which are coaxially sleeved on the output shaft 6 respectively, the outer edges of the plurality of first friction plates are keyed to the inner wall of the mounting portion 71 and can slide axially, the inner edges of the plurality of second friction plates are keyed to the output shaft 6 and can slide axially, the plurality of first friction plates and the plurality of second friction plates are staggeredly distributed along the axial direction, and the piston 41 is used to move axially and extend into the mounting portion 71 so that the plurality of first friction plates and the plurality of second friction plates are abutted against each other. Specifically, a plurality of first key blocks extending along the axial direction are provided at intervals along the circumference of the inner side of the mounting portion 71, a first key groove matching the first key block is provided at the outer edges of the plurality of first friction plates, and the first key blocks are embedded in the first key groove, ensuring that the first friction plates can only move relatively along the axial direction of the mounting portion 71. Similarly, a plurality of second key blocks extending along the axial direction are provided at intervals along the circumference of the outer surface of the output shaft 6, a second key groove matching the second key block is provided at the inner edges of the plurality of second friction plates, and the second key blocks are embedded in the second key groove, ensuring that the second friction plates can only move relatively along the axial direction of the output shaft 6. When the piston 41 presses the clutch plate group 5, the first friction plate and the second friction plate are abutted against each other, and when the driven gear 7 rotates, the output shaft 6 can be driven to rotate synchronously through the linkage of the first friction plate and the second friction plate.
[0029] In this embodiment, one end of the input gear shaft 2 passes through one end of the housing 1 and extends into the first assembly groove adapted to the other end of the housing 1. The first assembly groove and one end of the housing 1 are both rotatably assembled with the input gear shaft 2 through a first bearing; one end of the output shaft 6 passes through the other end of the housing 1 and extends into the second assembly groove adapted to the one end of the housing 1. The second assembly groove and the other end of the housing 1 are both rotatably assembled with the output shaft 6 through a second bearing; the driven gear 7 is mounted on the output shaft 6 through a third bearing. The input gear shaft 2, the output shaft 6 and the driven gear 7 are all rotatably assembled through bearings, and the structures are compact and stable.
[0030] In this embodiment, the output shaft 6 is provided with an assembly section with an increased diameter, and the mounting portion 71 is located at the periphery of the assembly section. The hydraulic cylinder 4 is located at one end of the assembly section, and the driven gear 7 is assembled at the other end of the assembly section.
[0031] As a pre-selected implementation method, Figure 2As shown, the hydraulic cylinder 4 comprises the annular piston 41 and the annular cylinder body 42. The cylinder body 42 is coaxially sleeved on one end of the output shaft 6 and close to one end of the assembly section. The cylinder body 42 defines an annular groove at one end close to the assembly section. The piston 41 is coaxially sleeved on the inner wall of the annular groove, and a sealing portion is provided on the outer edge of the piston 41 for sealing contact with the outer edge of the cylinder body 42. The piston cavity is formed between the piston 41 and the annular groove. The piston 41 is provided with an annular protrusion 411 at one end close to the assembly section. An assembly groove is recessed inward at one end of the assembly section. A spring is sleeved in the assembly groove, and the spring abuts against the end of the piston 41.
[0032] In the above embodiment, the inner hole of the piston 41 contacts the inner wall of the annular groove of the cylinder body 42, but does not contact the output shaft 6. This sealing structure avoids the problem that the piston 41 is scratched or cut by the groove on the output shaft 6 during the assembly process. In addition, the structural design of the piston 41 and the cylinder body 42 is reasonable, and effective telescopic movement can be achieved. In addition, the design of the protrusion 411 can effectively drive the clutch plate group 5 to separate and the mounting part 71 to be linked or separated from the output shaft 6.
[0033] As a preferred embodiment, a first annular notch is provided at the inner edge of one end of the cylinder body 42 away from the assembly section, a second annular notch is provided at a position on the output shaft 6 corresponding to the first annular notch, a retaining ring 9 is embedded in both the first annular notch and the second annular notch, and the retaining ring 9 includes two semicircular retaining plates.
[0034] In the above embodiment, the retaining ring 9 is composed of two half-ring retaining pieces, and the thickness and hardness are higher than those of ordinary retaining rings, so as to avoid the retaining ring 9 being deformed or disengaged by the oil pressure when the oil pump 3 is filled with oil. At the same time, the retaining ring 9 is installed compactly and firmly.
[0035] In this embodiment, an annular sealing groove is provided at the end of the outer wall of the annular groove, and an annular sealing portion 412 embedded in the sealing groove is provided at one end of the piston 41 away from the assembly section. This design improves the sealing performance of the assembly between the piston 41 and the cylinder body 42.
[0036] In this embodiment, the oil circuit includes a first oil circuit and a second oil circuit. One end of the first oil circuit passes through the inner wall of the annular groove from the inside of the output shaft 6 and enters from the bottom of the piston cavity. The other end of the first oil circuit extends to the surface of one end of the output shaft 6. The second oil circuit is arranged inside one end of the housing 1, one end of which extends to the surface of the housing 1 and is connected and communicated with the oil pump 3. The other end of the second oil circuit extends to connect and communicate with the other end of the first oil circuit. The oil circuit is designed in the output shaft 6 and the side wall of the housing 1, and does not leak out. The design is very clever and reasonable.
[0037] As a preferred implementation,.
[0038] Considering that the housing 1 of the entire transmission box is relatively small, the oil stirred by the passive gear 7 and the active gear in the housing 1 will fill the entire housing 1. Therefore, a respirator baffle 81 is provided on the top wall of the housing 1 corresponding to the portion below the respirator 8.
[0039] Example 2
[0040] This embodiment provides a tractor, including the micro front PTO transmission box structure in Embodiment 1.
[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0043] 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, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0045] 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 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A miniature front PTO transmission box structure, characterized in that: The invention comprises a housing (1), an input gear shaft (2), an oil pump (3), a hydraulic cylinder (4), a clutch plate group (5) and an output shaft (6), wherein one end of the input gear shaft (2) is rotatably mounted on the upper part of the housing (1), one end of the output shaft (6) is rotatably mounted on the lower part of the housing (1) and is parallel to the input gear shaft (2), one end of the input gear shaft (2) is coaxially fixedly equipped with a driving gear, one end of the output shaft (6) is coaxially rotatably equipped with a driven gear (7), the driving gear meshes with the driven gear (7), and one end of the driven gear (7) is coaxially fixedly equipped with a circular ring. The mounting portion (71) is provided with a clutch plate group (5) mounted in the mounting portion (71). The clutch plate group (5) is connected to the mounting portion (71) and the output shaft (6) respectively. The hydraulic cylinder (4) is fixedly mounted on one end of the output shaft (6). The hydraulic cylinder (4) has a circular piston (41) coaxially distributed with the output shaft (6), and the piston (41) is close to the mounting portion (71). The oil pump (3) is mounted on the lower end of the housing (1) and is connected to the piston cavity of the hydraulic cylinder (4) through an oil circuit. A breather (8) connected to the inner cavity of the housing (1) is provided on the top of the housing (1).
2. A miniature front PTO transmission box structure according to claim 1, characterized in that: The clutch plate group (5) comprises a plurality of first friction plates and a plurality of second friction plates, which are respectively coaxially sleeved on the output shaft (6), the outer edges of the plurality of first friction plates are key-connected to the inner wall of the mounting portion (71) and can slide axially, the inner edges of the plurality of second friction plates are key-connected to the output shaft (6) and can slide axially, the plurality of first friction plates and the plurality of second friction plates are staggeredly distributed along the axial direction, and the piston (41) is used to move axially and extend into the mounting portion (71) so that the plurality of first friction plates and the plurality of second friction plates abut against each other.
3. The miniature front PTO transmission box structure according to claim 1 is characterized in that: One end of the input gear shaft (2) passes through one end of the housing (1) and extends into a first assembly groove adapted to the other end of the housing (1); the first assembly groove and one end of the housing (1) are both rotatably assembled with the input gear shaft (2) via a first bearing; one end of the output shaft (6) passes through the other end of the housing (1) and extends into a second assembly groove adapted to the other end of the housing (1); the second assembly groove and the other end of the housing (1) are both rotatably assembled with the output shaft (6) via a second bearing; the driven gear (7) is mounted on the output shaft (6) via a third bearing.
4. The miniature front PTO transmission box structure according to claim 1 is characterized in that: The output shaft (6) is provided with an assembly section with an increased diameter, and the mounting portion (71) is located outside the assembly section.
5. The miniature front PTO transmission box structure according to claim 4 is characterized in that: The hydraulic cylinder (4) comprises an annular piston (41) and an annular cylinder body (42). The cylinder body (42) is coaxially sleeved on one end of the output shaft (6) and is close to one end of the assembly section. The cylinder body (42) defines an annular groove at one end close to the assembly section. The piston (41) is coaxially sleeved on the inner wall of the annular groove. The outer edge of the piston (41) is provided with a sealing portion that is in sealing contact with the outer edge of the cylinder body (42). The piston cavity is formed between the piston (41) and the annular groove. The piston (41) is provided with an annular protrusion (411) at one end close to the assembly section. One end of the assembly section is concavely provided with an assembly groove. A spring is sleeved in the assembly groove. The spring abuts against the end of the piston (41).
6. The miniature front PTO transmission box structure according to claim 5, characterized in that: A first annular notch is provided at the inner edge of one end of the cylinder body (42) away from the assembly section, and a second annular notch is provided at a position on the output shaft (6) corresponding to the first annular notch. A retaining ring (9) is embedded in both the first annular notch and the second annular notch, and the retaining ring (9) includes two semicircular retaining plates.
7. The miniature front PTO transmission box structure according to claim 5, characterized in that: An annular sealing groove is provided at the end of the outer wall of the annular groove, and an annular sealing portion (412) embedded in the sealing groove is provided at one end of the piston (41) away from the assembly section.
8. The miniature front PTO transmission box structure according to claim 5, characterized in that: The oil circuit comprises a first oil circuit and a second oil circuit, one end of the first oil circuit passes through the inner wall of the annular groove from the inside of the output shaft (6) and enters from the bottom of the piston cavity, the other end of the first oil circuit extends to the surface of one end of the output shaft (6), the second oil circuit is arranged inside one end of the housing (1), one end of the second oil circuit extends to the surface of the housing (1) and is connected and communicated with the oil pump (3), the other end of the second oil circuit extends to connect and communicate with the other end of the first oil circuit.
9. A miniature front PTO transmission box structure according to any one of claims 1 to 8, characterized in that: A respirator baffle (81) is provided at a position of the top wall of the box body (1) corresponding to the bottom of the respirator (8).
10. A tractor, characterized in that: It comprises the micro front PTO transmission box structure as described in any one of claims 1 to 9.