Two-speed power output transmission mechanism, transmission system and tractor

Abstract

The utility model discloses a two-speed power output transmission mechanism, a transmission system and a tractor, the two-speed power output transmission mechanism comprises a power input shaft, a power output shaft, a power switching piece, two driving gears and two driven gears, the power input shaft and the power output shaft are parallel to each other; the two driving gears are both coaxially and fixedly installed on the power input shaft, the two driven gears are both coaxially and rotatably installed on the power output shaft, the two driving gears and the two driven gears are in one-to-one correspondence, the diameters of the two driving gears are different, each driving gear is meshed with the corresponding driven gear, and the two driving gears are meshed with the corresponding driven gear. The power switching part is installed on the power output shaft and used for enabling the power output shaft to be in transmission connection with any one of the driven gears, so that the two output gears of the two-speed power output transmission mechanism are switched through the power switching part, the reduction ratios of the two output gears are different, and the two-speed power output transmission mechanism is simple in structure and flexible in switching.

Description

Technical Field

[0001] The utility model belongs to the field of transmission mechanisms, and in particular relates to a two-speed power output transmission mechanism, a transmission system and a tractor. Background Art

[0002] The conventional general-purpose tractor power output transmission structure has a large axial dimension and is not compact enough to meet the requirements of the axial dimension of the vehicle body in small plots such as hilly and mountainous areas. In particular, the gear shifting part of the PTO shaft of the power output of the existing conventional tractor occupies a large space, as shown in the document No. CN208295101U "New Tractor PTO Shifting Control Mechanism" Figure 3 In the disclosed structure, the two gears on each shaft are arranged at intervals, which makes it occupy a large space. Utility Model Content

[0003] In order to solve the above technical problems, one of the purposes of the utility model is to provide a two-speed power output transmission mechanism with a simple structure and capable of achieving two-speed adjustment.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a two-speed power output transmission mechanism, comprising a power input shaft, a power output shaft, a power switching member, two driving gears and two passive gears, the power input shaft and the power output shaft are parallel to each other, the two driving gears are coaxially fixedly mounted on the power input shaft, the two passive gears are coaxially rotatably mounted on the power output shaft, the two driving gears and the two passive gears correspond one to one, and the diameters of the two driving gears are different, each driving gear is meshed with the corresponding passive gear, the power switching member is mounted on the power output shaft, and is used to connect the power output shaft with any one of the passive gears in a transmission manner.

[0005] The beneficial effect of the above technical solution is that the two output gears of the two-speed power output transmission mechanism are switched by the power switching member, and the two output gears have different reduction ratios, the structure is simple, and the switching is flexible.

[0006] In the above technical solution, the two driving gears are respectively the first driving gear and the second driving gear, and the two passive gears are respectively the first passive gear and the second passive gear, the first driving gear and the first passive gear are meshed with each other, the second driving gear and the second passive gear are meshed with each other, a second ring sleeve is coaxially arranged on one side of the second passive gear, and the first passive gear is coaxially rotatably mounted on the second ring sleeve.

[0007] The beneficial effect of the above technical solution is that one of the output gears is composed of power input shaft-first driving gear-first passive gear-power switching member-power output shaft, while the other output gear is composed of power input shaft-second driving gear-second passive gear-power switching member-power output shaft.

[0008] In the above technical solution, a first ring sleeve is coaxially arranged on the side of the first passive gear away from the second passive gear, the second ring sleeve extends out of the first passive gear and is located in the first ring sleeve, and an annular gap is provided between the second ring sleeve and the first ring sleeve, a second gear sleeve is coaxially arranged on the outer wall of the second ring sleeve, and a first gear sleeve is coaxially arranged on the inner wall of the first ring sleeve, the second gear sleeve and the first gear sleeve are staggered along the axial direction of the power output shaft, and the outer diameter of the second gear sleeve is smaller than the inner diameter of the first gear sleeve, and the power switching member is slidably mounted on the first gear sleeve through a spline On the power output shaft, one end of the power switching member is provided with an outer gear sleeve and an inner gear sleeve and extends into the gap between the second ring sleeve and the first ring sleeve, the outer gear sleeve corresponds to the first gear sleeve, and the inner gear sleeve corresponds to the second gear sleeve, the power switching member slides axially along the power output shaft until the outer gear sleeve is meshed with the first gear sleeve to connect the power output shaft with the first passive gear, or the power switching member slides axially along the power output shaft until the inner gear sleeve is meshed with the second gear sleeve to connect the power output shaft with the second passive gear.

[0009] The beneficial effect of the above technical solution is that the gear shifting can be achieved by sliding the power switching member axially along the power output shaft.

[0010] The power switching member in the above technical solution is trumpet-shaped, and its end with a smaller opening is slidably connected to the power output shaft through a spline, and the inner gear sleeve and the outer gear sleeve are coaxially arranged at the end with a larger opening of the power switching member.

[0011] The beneficial effect of the above technical solution is that it has a simple structure and can be slidably connected to the power output shaft along the axial direction and can extend between the second ring sleeve and the first ring sleeve.

[0012] In the above technical solution, a spline groove is provided at the sliding connection between the power output shaft and the power switching component, and a spline tooth is provided at the smaller opening end of the power switching component. The spline tooth extends into the spline groove to slidingly connect the power switching component and the power output shaft.

[0013] The beneficial effect of the above technical solution is that it can not only enable the power switching member to slide relative to the length of the power output shaft, but also maintain synchronous rotation with the power output shaft without rotating relative to the power output shaft.

[0014] In the above technical solution, a shifting groove is coaxially recessed on the outer wall of the smaller opening end of the power switching member, and the shifting groove is used for the shifting fork to be inserted.

[0015] The beneficial effect of the above technical solution is that the shift fork can be easily contacted with the power switching member to drive it to slide axially along the power output shaft.

[0016] A second object of the present invention is to provide a transmission system with a simple structure and capable of achieving two-speed transmission.

[0017] In order to achieve the above-mentioned purpose, another technical solution of the present utility model is as follows: a transmission system comprises the two-speed power output transmission mechanism as described above.

[0018] The beneficial effects of the above technical solution are: it has a simple structure and can be flexibly switched between two output gears.

[0019] A third object of the utility model is to provide a tractor with a simple transmission structure.

[0020] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a tractor, characterized in that it includes the transmission system as described above.

[0021] The beneficial effect of the above technical solution is that its power transmission system is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the two-speed power output transmission mechanism described in Example 1 of the utility model;

[0023] Figure 2 It is a schematic diagram of the specific structure of the two-speed power output transmission mechanism according to the embodiment of the utility model;

[0024] Figure 3 It is a schematic diagram of the power switching member and the power output shaft being slidably connected via a spline in an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the lubrication channel between the two passive gears and the power output shaft in the embodiment of the utility model.

[0026] In the figure: 1 power input shaft; 11 oil injection channel; 12 oil injection branch channel; 2 power output shaft; 21 spline groove; 22 convex ring; 3 power switching member; 31 external gear sleeve; 32 internal gear sleeve; 33 spline teeth; 34 toggle groove; 4 driving gear; 4a first driving gear; 4b second driving gear; 5 driven gear; 5a first driven gear; 5b second driven gear; 51a first ring sleeve; 51b second ring sleeve; 511 sub-oil injection hole; 52a first gear sleeve; 52b second gear sleeve; 6a first gap; 6b second gap; 7 floating sealing ring. DETAILED DESCRIPTION

[0027] 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. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0028] Example 1

[0029] like Figure 1 As shown, this embodiment provides a two-speed power output transmission mechanism, including a power input shaft 1, a power output shaft 2, a power switching member 3, two driving gears 4 and two driven gears 5, the power input shaft 1 and the power output shaft 2 are parallel to each other, the two driving gears 4 are coaxially fixedly mounted on the power input shaft 1, the two driven gears 5 are coaxially rotatably mounted on the power output shaft 2, the two driving gears 4 and the two driven gears 5 correspond one to one, and the diameters of the two driving gears 4 are different, each of the driving gears 4 is meshed with the corresponding driven gear 5, the power switching member 3 is mounted on the power output shaft 2, and is used to drive and connect the power output shaft 2 with any one of the driven gears 5, so that the two output gears of the two-speed power output transmission mechanism are switched by the power switching member, and the two output gears have different reduction ratios, the structure is simple, and the switching is flexible.

[0030] like Figure 2As shown, in the above technical solution, the two driving gears 4 are respectively the first driving gear 4a and the second driving gear 4b, and the two driven gears 5 are respectively the first driven gear 5a and the second driven gear 5b, the first driving gear 4a and the first driven gear 5a are meshed with each other, the second driving gear 4b and the second driven gear 5b are meshed with each other, a second ring sleeve 51b is coaxially arranged on one side of the second driven gear 5b, and the first driven gear 5a is coaxially rotatably mounted on the second ring sleeve 51b, so that one of the output gears is from the power input shaft-first driving gear-first driven gear-power switching member-power output shaft, and the other output gear is from the power input shaft-second driving gear-second driven gear-power switching member-power output shaft; the first driven gear 5a is coaxially arranged with a first ring sleeve 51a on one side away from the second driven gear 5b, the second ring sleeve 51b extends out of the first driven gear 5a and is located in the first ring sleeve 51a, and there is an annular gap between the second ring sleeve 51b and the first ring sleeve 51a, and a second ring sleeve 51b is coaxially arranged on the outer wall of the second ring sleeve 51b The first gear sleeve 52a is coaxially arranged on the inner wall of the first ring sleeve 51a, the second gear sleeve 52b and the first gear sleeve 52a are staggered along the axial direction of the power output shaft 2, and the outer diameter of the second gear sleeve 52b is smaller than the inner diameter of the first gear sleeve 52a, the power switching member 3 is slidably mounted on the power output shaft 2 through a spline, and one end of the power switching member 3 is provided with an outer gear sleeve 31 and an inner gear sleeve 32 and extends into the gap between the second ring sleeve 51b and the first ring sleeve 51a, and the outer gear sleeve 31 is opposite to the first gear sleeve 52a. The inner gear sleeve 32 corresponds to the second gear sleeve 52b, and the power switching element 3 slides axially along the power output shaft 2 to the outer gear sleeve 31 and meshes with the first gear sleeve 52a to drive the power output shaft 2 to the first passive gear 5a, or the power switching element 3 slides axially along the power output shaft 2 to the inner gear sleeve 32 and meshes with the second gear sleeve 52b to drive the power output shaft 2 to the second passive gear 5b, so that the power switching element can achieve gear switching by sliding axially along the power output shaft.

[0031] The diameter of the first driving gear is larger than the diameter of the second driving gear, but the diameters of the two driving gears are smaller than the diameters of the corresponding driven gears.

[0032] like Figure 1 and Figure 2As shown, the power switching member 3 in the above technical solution is trumpet-shaped, and the end with a smaller opening is slidingly connected to the power output shaft 2 through a spline, and the inner gear sleeve 32 and the outer gear sleeve 31 are coaxially arranged at the larger opening end of the power switching member 3, respectively. It has a simple structure, which can satisfy the axial sliding connection with the power output shaft and can extend between the second ring sleeve and the first ring sleeve.

[0033] like Figure 3 As shown, in the above technical solution, a spline groove 21 is provided at the sliding connection between the power output shaft 2 and the power switching member 3, and a spline tooth 33 is provided at the smaller opening end of the power switching member 3. The spline tooth 33 extends into the spline groove 21 to slidingly connect the power switching member 3 with the power output shaft 2, so that the power switching member can slide relative to the length of the power output shaft, and can maintain synchronous rotation with the power output shaft without rotating relative to the power output shaft; a toggle groove 34 is coaxially recessed on the outer wall of the smaller opening end of the power switching member 3, and the toggle groove 34 is used for inserting a shift fork, so that the shift fork can easily contact the power switching member to drive it to slide axially along the power output shaft.

[0034] Among them, Figure 4As shown, in this embodiment, the power switching member 3 is located on the side of the first passive gear 5a away from the second passive gear 5b, the second passive gear 5b and the power output shaft 2 are rotatably connected through a bearing, and the first passive gear 5a and the second ring sleeve 51b are also rotatably connected through a bearing (therefore, there are gaps for bearing installation between the second passive gear 5b and the power output shaft 2 and between the first passive gear 5a and the second ring sleeve 51b, wherein the gap between the second passive gear 5b and the power output shaft 2 is a first gap 6a, and the gap between the first passive gear 5a and the second ring sleeve 51b is a second gap 6b), and the end of the power output shaft 2 close to the second passive gear 5b away from the first passive gear 5a is provided with a convex ring 22 to correspond the first gap 6a to the The first end of the first gap 6a is blocked by a floating sealing ring 7 coaxially fixedly mounted on the power output shaft 2 near the power switching member 3. The first passive gear 5a and the second passive gear 5b fit each other, so the second end of the second gap 6b near the second passive gear 5b is blocked by the second passive gear 5b. The second end of the second gap 6b near the power switching member 3 is also blocked by a floating sealing ring 7 coaxially fixedly mounted on the second ring sleeve 51b. An oil injection channel 11 is coaxially recessed at one end of the power output shaft 2 near the power switching member 3. The oil injection channel 11 is connected to the first gap 6a through an oil injection branch channel 12. A sub-oil injection hole 511 is provided on the second ring sleeve 51b to connect the first gap 6a and the second gap 6b, so that both bearings can be lubricated.

[0035] Example 2

[0036] This embodiment provides a transmission system, including the two-speed power output transmission mechanism as described in Embodiment 1, which has a simple structure and can be flexibly switched between two output gears.

[0037] Example 3

[0038] This embodiment provides a tractor, including the transmission system as described in Embodiment 2, and its power transmission system is simple.

[0039] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A two-speed power output transmission mechanism, characterized in that: The invention comprises a power input shaft (1), a power output shaft (2), a power switching member (3), two driving gears (4) and two driven gears (5), wherein the power input shaft (1) and the power output shaft (2) are parallel to each other, the two driving gears (4) are coaxially fixedly mounted on the power input shaft (1), the two driven gears (5) are coaxially rotatably mounted on the power output shaft (2), the two driving gears (4) and the two driven gears (5) correspond to each other one by one, and the diameters of the two driving gears (4) are different, each driving gear (4) is meshed with the corresponding driven gear (5), and the power switching member (3) is mounted on the power output shaft (2) and is used for drivingly connecting the power output shaft (2) with any one of the driven gears (5).

2. The two-speed power output transmission mechanism according to claim 1, characterized in that: The two driving gears (4) are respectively a first driving gear (4a) and a second driving gear (4b); the two driven gears (5) are respectively a first driven gear (5a) and a second driven gear (5b); the first driving gear (4a) and the first driven gear (5a) are meshed with each other; the second driving gear (4b) and the second driven gear (5b) are meshed with each other; a second ring sleeve (51b) is coaxially arranged on one side of the second driven gear (5b); and the first driven gear (5a) is coaxially rotatably mounted on the second ring sleeve (51b).

3. The two-speed power output transmission mechanism according to claim 2, characterized in that: A first ring sleeve (51a) is coaxially arranged on the side of the first passive gear (5a) facing away from the second passive gear (5b); the second ring sleeve (51b) extends out of the first passive gear (5a) and is located inside the first ring sleeve (51a); an annular gap is provided between the second ring sleeve (51b) and the first ring sleeve (51a); a second gear sleeve (52b) is coaxially arranged on the outer wall of the second ring sleeve (51b); a first gear sleeve (52a) is coaxially arranged on the inner wall of the first ring sleeve (51a); the second gear sleeve (52b) and the first gear sleeve (52a) are staggered along the axial direction of the power output shaft (2); the outer diameter of the second gear sleeve (52b) is smaller than the inner diameter of the first gear sleeve (52a); the power switching member (3) is slidably mounted on the power output shaft through a spline. (2), and one end of the power switching member (3) is provided with an outer gear sleeve (31) and an inner gear sleeve (32) and extends into the gap between the second ring sleeve (51b) and the first ring sleeve (51a), the outer gear sleeve (31) corresponds to the first gear sleeve (52a), and the inner gear sleeve (32) corresponds to the second gear sleeve (52b), the power switching member (3) slides axially along the power output shaft (2) to the outer gear sleeve (31) and meshes with the first gear sleeve (52a) to drive the power output shaft (2) to the first passive gear (5a), or the power switching member (3) slides axially along the power output shaft (2) to the inner gear sleeve (32) and meshes with the second gear sleeve (52b) to drive the power output shaft (2) to the second passive gear (5b).

4. The two-speed power output transmission mechanism according to claim 3, characterized in that: The power switching member (3) is trumpet-shaped, and the end with a smaller opening is slidably connected to the power output shaft (2) via a spline. The inner gear sleeve (32) and the outer gear sleeve (31) are coaxially arranged at the end with a larger opening of the power switching member (3).

5. The two-speed power output transmission mechanism according to claim 4, characterized in that: A spline groove (21) is provided at the sliding connection between the power output shaft (2) and the power switching component (3), and a spline tooth (33) is provided at the smaller opening end of the power switching component (3). The spline tooth (33) extends into the spline groove (21) to slidingly connect the power switching component (3) and the power output shaft (2).

6. The two-speed power output transmission mechanism according to claim 4 or 5, characterized in that: A shifting groove (34) is coaxially recessed on the outer wall of the smaller opening end of the power switching member (3), and the shifting groove (34) is used for inserting a shifting fork.

7. A transmission system, characterized in that: It comprises a two-speed power output transmission mechanism as described in any one of claims 1-6.

8. A tractor, characterized in that: Comprising the transmission system as claimed in claim 7.

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