CN222277443U - A micro-sized front PTO transmission box structure and a tractor having the same - Google Patents

Abstract

The utility model relates to a microminiature front PTO transmission case structure and a tractor with the microminiature front PTO transmission case structure. The miniature front PTO transmission case structure comprises a case body, an input gear shaft, an oil pump, a hydraulic cylinder, a clutch plate set and an output shaft, wherein one end of the input gear shaft is rotationally arranged in the case body, one end of the output shaft is rotationally arranged in the case body and parallel to the input gear shaft, one end of the input gear shaft is coaxially and fixedly provided with a driving gear, one end of the output shaft is coaxially provided with a driven gear, the driving gear is meshed with the driven gear, one end of the driven gear is coaxially and fixedly provided with a circular installation part, the clutch plate set is assembled in the installation part, the clutch plate set is connected with the installation part and the output shaft, the hydraulic cylinder is fixedly arranged at one end of the output shaft and provided with a circular piston coaxially distributed with the output shaft, the piston is close to the installation part, the oil pump is arranged on the case body and communicated with a piston cavity of the hydraulic cylinder through an oil way, and the top of the case body is provided with a respirator communicated with an inner cavity of the hydraulic cylinder. The clutch structure and the sealing structure are optimized.

Description

Microminiature front PTO transmission case structure and tractor with microminiature front PTO transmission case structure

Technical Field

The utility model relates to the technical field of tractor transmission boxes, in particular to a microminiature front PTO transmission box structure and a tractor with the microminiature front PTO transmission box structure.

Background

At present, the middle-size and small-size tractor is transformed towards the multifunctional direction, and the front PTO which is required to meet the complex working conditions of weeding, rotary tillage and the like in the garden is standard and matched with the multifunctional middle-size and small-size tractor.

However, the matched front PTO transmission case of the medium-sized tractor is basically mature, and can meet the requirement of driving agricultural machinery to perform daily cultivation tasks on the garden. However, the transmission case is not configured for a micro-tractor or a small tractor.

Based on this, it is desirable to develop a front PTO transmission case that is compatible with micro-and small-sized tractors.

Disclosure of utility model

The utility model aims to solve the technical problem of providing a microminiature front PTO transmission case structure and a tractor with the microminiature front PTO transmission case structure, and effectively overcomes the defects of the prior art.

The technical scheme for solving the technical problems is as follows:

A miniature front PTO transmission case structure comprises a case body, an input gear shaft, an oil pump, a hydraulic cylinder, a clutch plate set and an output shaft, wherein one end of the input gear shaft is rotatably arranged in the case body, one end of the output shaft is rotatably arranged in the case body and parallel to the input gear shaft, a driving gear is coaxially and fixedly assembled at one end of the input gear shaft, a driven gear is coaxially and rotatably assembled at one end of the output shaft, the driving gear is meshed with the driven gear, a circular installation part is coaxially and fixedly arranged at one end of the driven gear, the clutch plate set is assembled in the installation part, the clutch plate set is respectively connected with the installation part and the output shaft, the hydraulic cylinder is fixedly arranged at one end of the output shaft and provided with a circular piston coaxially distributed with the output shaft, the piston is close to the installation part, the oil pump is arranged on the case body and communicated with a piston cavity of the hydraulic cylinder through an oil way, and a respirator communicated with the inner cavity of the case body is arranged at the top.

On the basis of the technical scheme, the utility model can be improved as follows.

Further, the clutch plate set includes a plurality of first friction plates and a plurality of second friction plates, the plurality of first friction plates and the plurality of second friction plates are respectively sleeved on the output shaft in a coaxial manner, the outer edges of the plurality of first friction plates are connected with the inner wall keys of the mounting portion and can axially slide, the inner edges of the plurality of second friction plates are connected with the output shaft keys and can axially slide, the plurality of first friction plates and the plurality of second friction plates are distributed in an axially staggered manner, and the piston is used for axially moving and extending into the mounting portion so as to enable the plurality of first friction plates and the plurality of second friction plates to abut against each other.

Further, one end of the input gear shaft penetrates through one end of the box body and stretches into a first assembly groove matched with the other end of the box body, the first assembly groove and one end of the box body are rotatably assembled with the input gear shaft through a first bearing, one end of the output shaft penetrates through the other end of the box body and stretches into a second assembly groove matched with one end of the box body, the second assembly groove and the other end of the box body are rotatably assembled with the output shaft through a second bearing, and the driven gear is mounted on the output shaft through a third bearing.

Further, 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.

Further, the hydraulic cylinder includes an annular piston and an annular cylinder body, the cylinder body is coaxially sleeved at one end of the output shaft and is close to one end of the assembly section, one end of the cylinder body close to the assembly section defines a ring groove, the piston is coaxially sleeved on the inner wall of the ring groove, a sealing part in sealing contact with the outer edge of the cylinder body is arranged at the outer edge of the piston, the piston cavity is formed between the piston and the ring groove, an annular protruding part is arranged at one end of the piston close to the assembly section, an assembly groove is concavely arranged at one end of the assembly section, a spring is sleeved in the assembly groove, and the spring abuts against the end part of the piston.

Further, a first annular gap is formed in the inner edge of one end, far away from the assembly section, of the cylinder body, a second annular gap is formed in the output shaft, corresponding to the first annular gap, a check ring is embedded in the first annular gap and the second annular gap, and the check ring comprises two semicircular baffle plates.

Further, an annular sealing groove is formed in the end portion of the outer wall of the annular groove, and an annular sealing portion embedded in the sealing groove is formed in one end, away from the assembly section, of the piston.

Further, the oil passage includes a first oil passage and a second oil passage, one end of the first oil passage penetrates through the inner wall of the annular groove from the inside of the output shaft and enters from the bottom of the piston chamber, the other end of the first oil passage extends to the surface of one end of the output shaft, the second oil passage is disposed inside one end of the tank, one end of the second oil passage extends to the surface of the tank and is connected and communicated with the oil pump, and the other end of the second oil passage extends to be connected and communicated with the other end of the first oil passage.

Further, a respirator baffle is arranged at the part of the top wall of the box body, which corresponds to the lower part of the respirator.

The utility model has the beneficial effects that the structural design is reasonable, the defect of a miniaturized front PTO transmission case which is not matched with the existing small tractor is overcome, and the clutch structure and the sealing structure are optimized.

A tractor is also provided, including a miniature front PTO gearbox structure.

Drawings

FIG. 1 is a schematic diagram of the structure of a miniature front PTO transmission case of the present utility model;

Fig. 2 is a schematic diagram of the hydraulic cylinder in the structure of the miniature front PTO transmission case of the present utility model.

In the drawings, the list of components represented by the various numbers is as follows:

1. The device comprises a box body, 2 input gear shafts, 3, an oil pump, 4, a hydraulic cylinder, 5, a clutch plate group, 6, an output shaft, 7, a driven gear, 8, a respirator, 9, a retainer ring, 41, a piston, 42, a cylinder body, 71, a mounting part, 81, a respirator baffle plate, 411, a protruding part, 412 and an annular sealing part.

Detailed Description

The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.

Example 1

As shown in fig. 1, the microminiature front PTO transmission case structure of the present embodiment includes a case 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 at an upper portion in the case 1, one end of the output shaft 6 is rotatably mounted at a lower portion in the case 1 and parallel to the input gear shaft 2, a driving gear is fixedly mounted at one end of the input gear shaft 2 coaxially, a driven gear 7 is rotatably mounted at one end of the output shaft 6 coaxially, the driving gear is engaged with the driven gear 7, a circular ring-shaped mounting portion 71 is coaxially mounted at one end of the driven gear 7, the clutch plate group 5 is 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 at one end of the output shaft 6, the piston 41 has a circular ring-shaped piston 41 coaxially distributed with the output shaft 6, and is close to the mounting portion 71, the oil pump 3 is mounted at the lower end of the case 1 and is communicated with a top of the hydraulic cylinder chamber 8 of the case 1 through the oil passage.

The working principle is as follows:

The engine drives the input gear shaft 2 to rotate, the driving gear on the input gear shaft 2 drives the driven gear 7 to rotate, when the oil pump 3 does not supply oil, the clutch plate set 5 does not work, the driven gear 7 idles, and the output shaft 6 does not output power. When the oil pump 3 supplies oil, the piston 41 of the hydraulic cylinder 4 moves toward the mounting portion 71 under the action of the oil pressure and extends into the mounting portion, so as to press the clutch plate group 5, and at this time, the output shaft 6 and the driven gear 7 are linked, and the driven gear 7 drives the output shaft 6 to rotate, so that power transmission is realized. The whole transmission case has reasonable structural design, fills the defect of the miniature front PTO transmission case of the small tractor without matching, and optimizes the clutch structure and the sealing structure.

In this embodiment, the clutch plate set 5 includes a plurality of first friction plates and a plurality of second friction plates, the plurality of first friction plates and the plurality of second friction plates are respectively coaxially sleeved on the output shaft 6, the outer edges of the plurality of first friction plates are connected with the inner wall of the mounting portion 71 in a key manner and can slide axially, the inner edges of the plurality of second friction plates are connected with the output shaft 6 in a key manner and can slide axially, the plurality of first friction plates and the plurality of second friction plates are distributed in a staggered manner along the axial direction, and the piston 41 is used for moving axially and extending into the mounting portion 71 so as to make the plurality of first friction plates and the plurality of second friction plates abut against each other. Specifically, a plurality of first key blocks extending along the axial direction are arranged on the inner side of the mounting portion 71 at intervals along the circumferential direction of the mounting portion, first key grooves matched with the first key blocks are formed in the outer edges of the first friction plates, the first key blocks are embedded into the first key grooves, the first friction plates can only move relatively along the axial direction of the mounting portion 71, a plurality of second key blocks extending along the axial direction are arranged on the outer surface of the output shaft 6 at intervals along the circumferential direction of the mounting portion, second key grooves matched with the second key blocks are formed in the inner edges of the second friction plates, and the second key blocks are embedded into the second key grooves, so 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 propped against each other, and when the driven gear 7 rotates, the output shaft 6 can be driven to synchronously rotate through the linkage of the first friction plate and the second friction plate.

In this embodiment, 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 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 a 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 rotatably assembled with the output shaft 6 through a second bearing, and 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 assembled in a rotating way through bearings, and the structure is compact and stable.

In this embodiment, the output shaft 6 is provided with an assembly section having an increased diameter, and the mounting portion 71 is located at the periphery of the assembly section. Wherein the hydraulic cylinder 4 is positioned at one end of the assembly section, and the driven gear 7 is assembled at the other end of the assembly section.

As a preselected embodiment, as shown in fig. 2, the hydraulic cylinder 4 includes an annular piston 41 and an annular cylinder 42, the cylinder 42 is coaxially sleeved on one end of the output shaft 6 and is close to one end of the assembly section, the cylinder 42 is close to one end of the assembly section to define a ring groove, the piston 41 is coaxially sleeved on an inner wall of the ring groove, a sealing part in sealing contact with an outer edge of the cylinder 42 is provided at an outer edge of the piston 41, the piston cavity is formed between the piston 41 and the ring groove, an annular protruding part 411 is provided at one end of the piston 41 close to the assembly section, an assembly groove is concavely provided at one end of the assembly section, a spring is sleeved in the assembly groove, and the spring abuts against an end of the piston 41.

In the above embodiment, the inner hole of the piston 41 is in contact with the inner wall of the ring groove of the cylinder 42, but not in contact with the output shaft 6, and the sealing structure avoids the problem that the piston 41 is scratched and damaged by the groove on the output shaft 6 in the assembling process. In addition, the design of the protruding portion 411 can effectively drive the clutch plate group 5 to be separated and the mounting portion 71 to be linked or separated with the output shaft 6.

As a preferred embodiment, a first annular gap is formed at an inner edge of one end of the cylinder 42 away from the assembly section, a second annular gap is formed at a position of the output shaft 6 corresponding to the first annular gap, a retainer ring 9 is jointly embedded in the first annular gap and the second annular gap, and the retainer ring 9 includes two semicircular retaining pieces.

In the above embodiment, the retainer ring 9 is composed of two semi-ring retaining pieces, and the thickness and hardness of the retainer ring are higher than those of a common retainer ring, so that the retainer ring 9 is prevented from being deformed or separated by oil pressure when the oil pump 3 is filled with oil. At the same time, the installation of the retainer ring 9 is compact and firm.

In this embodiment, an annular seal groove is provided at an end of the outer wall of the ring groove, and an annular seal portion 412 is provided at an end of the piston 41 facing away from the fitting section, the annular seal portion being fitted into the seal groove. This design improves the tightness of the fit between the piston 41 and the cylinder 42.

In this embodiment, the oil path includes a first oil path and a second oil path, one end of the first oil path passes through the inner wall of the ring 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 path extends to the surface of one end of the output shaft 6, the second oil path is disposed inside one end of the case 1, one end of the second oil path extends to the surface of the case 1 and is connected and communicated with the oil pump 3, and the other end of the second oil path extends to be connected and communicated with the other end of the first oil path. The oil way is designed in the side walls of the output shaft 6 and the box body 1, is not leaked, and is very ingenious and reasonable in design.

As a preferred embodiment.

Considering that the case 1 of the whole transmission case is small, the oil stirred by the driven gear 7 and the driving gear in the case 1 fills the whole case 1, and therefore, a respirator baffle 81 is disposed at a position of the top wall of the case 1 corresponding to the lower part of the respirator 8.

Example 2

The present embodiment provides a tractor including the microminiature front PTO transmission case structure of embodiment 1.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A microminiature front PTO transmission case structure is characterized by comprising a case 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), wherein one end of the input gear shaft (2) is rotatably arranged at the upper part in the case body (1), one end of the output shaft (6) is rotatably arranged at the lower part in the case body (1) and is parallel to the input gear shaft (2), a driving gear is coaxially and fixedly arranged at one end of the input gear shaft (2), a driven gear (7) is coaxially and rotatably arranged at one end of the output shaft (6), the driving gear is meshed with the driven gear (7), a circular mounting part (71) is coaxially fixed at one end of the driven gear (7), the clutch plate group (5) is arranged in the mounting part (71), the clutch plate group (5) is respectively connected with the mounting part (71) and the output shaft (6), the hydraulic cylinder (4) is fixedly arranged at one end of the output shaft (6), the output shaft (6) is provided with a driven gear (7) which is coaxially and fixedly arranged at one end of the output shaft (6), and is coaxially arranged with the piston (4) and is communicated with the lower end of the piston (41) through the piston (4), the top of the box body (1) is provided with a respirator (8) communicated with the inner cavity of the box body.

2. The structure of a miniature front PTO transmission case according to claim 1, wherein the clutch plate group (5) comprises a plurality of first friction plates and a plurality of second friction plates, the plurality of first friction plates and the plurality of second friction plates are respectively sleeved on the output shaft (6) in a coaxial manner, the outer edges of the plurality of first friction plates are connected with the inner wall of the mounting part (71) in a key manner and can slide axially, the inner edges of the plurality of second friction plates are connected with the output shaft (6) in a key manner and can slide axially, the plurality of first friction plates and the plurality of second friction plates are distributed in a staggered manner along the axial direction, and the piston (41) is used for moving axially and extending into the mounting part (71) so as to enable the plurality of first friction plates and the plurality of second friction plates to be propped against each other.

3. The miniature front PTO transmission case structure according to claim 1, wherein one end of the input gear shaft (2) penetrates through one end of the case body (1) and stretches into a first assembly groove matched with the other end of the case body (1), the first assembly groove and one end of the case body (1) are rotatably assembled with the input gear shaft (2) through first bearings, one end of the output shaft (6) penetrates through the other end of the case body (1) and stretches into a second assembly groove matched with one end of the case body (1), the second assembly groove and the other end of the case body (1) are rotatably assembled with the output shaft (6) through second bearings, and the driven gear (7) is mounted on the output shaft (6) through a third bearing.

4. A microminiature front PTO transmission case structure according to claim 1, wherein the output shaft (6) is provided with an enlarged diameter mounting section, and the mounting portion (71) is located at the periphery of the mounting section.

5. The miniature front PTO transmission case structure according to claim 4, wherein the hydraulic cylinder (4) comprises an annular piston (41) and an annular cylinder body (42), the cylinder body (42) is coaxially sleeved at one end of the output shaft (6) and is close to one end of the assembly section, one end of the cylinder body (42) close to the assembly section is limited to a ring groove, the piston (41) is coaxially sleeved on the inner wall of the ring groove, a sealing part in sealing contact with the outer edge of the cylinder body (42) is arranged at the outer edge of the piston, a piston cavity is formed between the piston (41) and the ring groove, an annular protruding part (411) is arranged at one end of the piston (41) close to the assembly section, an assembly groove is inwards concavely formed at one end of the assembly section, and a spring is sleeved in the assembly groove and is propped against the end part of the piston (41).

6. The miniature front PTO transmission case structure of claim 5, wherein a first annular gap is formed in an inner edge of one end, far away from the assembly section, of the cylinder body (42), a second annular gap is formed in a position, corresponding to the first annular gap, of the output shaft (6), a retainer ring (9) is embedded in the first annular gap and the second annular gap, and the retainer ring (9) comprises two semicircular baffle plates.

7. The structure of claim 5, wherein an annular seal groove is formed at an end of an outer wall of the ring groove, and an annular seal portion (412) is formed at an end of the piston (41) facing away from the assembly section and is embedded in the seal groove.

8. The structure of claim 5, wherein the oil path includes a first oil path and a second oil path, one end of the first oil path passes through the inner wall of the ring 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 path extends to one end surface of the output shaft (6), the second oil path is arranged inside one end of the box (1), one end of the second oil path extends to the surface of the box (1) and is connected and communicated with the oil pump (3), and the other end of the second oil path extends to be connected and communicated with the other end of the first oil path.

9. A miniature front PTO transmission case structure according to any one of claims 1 to 8, wherein a respirator baffle (81) is provided at a portion of the top wall of the case (1) corresponding to the lower portion of the respirator (8).

10. A tractor comprising a miniature front PTO transmission case structure according to any one of claims 1 to 9.