Duplex pump for tractor

Abstract

The utility model discloses a duplex pump for a tractor, relates to the technical field of agricultural machinery, and solves the problems that a plurality of hydraulic pumps cannot be driven due to the limitation of the size of an engine and a connector, and a switching device and a driving device of the hydraulic pump need to be specially arranged, so that the occupied space is increased. A pump shaft of the diesel engine penetrates through the cycloid hydraulic pump and then is connected with the input end of the gear pump, a hydraulic oil cavity used for assembling the outer rotor and the inner rotor is formed in the front side of the cycloid pump body, the outer rotor is rotationally installed in the hydraulic oil cavity, the inner rotor is eccentrically assembled on the pump shaft, and outer teeth of the inner rotor are meshed with inner teeth of the outer rotor. The gear pump and the cycloid hydraulic pump share one pump shaft, the engine can simultaneously drive the gear pump and the cycloid hydraulic pump to operate in the operation process, the functions of the gear pump and the cycloid hydraulic pump are achieved, and the cycloid hydraulic pump is suitable for the use environment with low pressure and displacement requirements and strict space requirements. The heat dissipation pump is particularly suitable for rear axle hydraulic oil heat dissipation pumps of high-horsepower tractors.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of agricultural machinery, especially a double pump for tractor. BACKGROUND

[0002] Now big horsepower tractor with the progress of technology, like power reversal, power shift, CVT transmission appears, needs bigger more hydraulic pump, and the size of engine and interface limit cannot drive so many hydraulic pumps, need to specially set up the switching device and driving device of hydraulic pump, leading to the increase of occupied space. SUMMARY

[0003] In view of the above-mentioned problem of engine size and interface limit cannot drive so many hydraulic pumps, need to specially set up the switching device and driving device of hydraulic pump, leading to the increase of occupied space, the utility model discloses a double pump for tractor, applicable to pressure, displacement requirement is not big, the space requirement is strict, especially suitable for the rear axle hydraulic oil heat dissipation pump of big horsepower tractor.

[0004] In order to realize the above-mentioned purpose, the technical scheme that the utility model adopts is:

[0005] A double pump for tractor, wherein, including: gear pump 4 and cycloidal hydraulic pump, the pump shaft 8 of diesel engine passes through cycloidal hydraulic pump and is connected with the input end of gear pump 4, and the cycloidal hydraulic pump includes: cycloidal pump body 6, outer rotor 1 and inner rotor 2, the cycloidal pump body 6 is located between diesel engine and gear pump 4, the front side of cycloidal pump body 6 is equipped with the hydraulic oil cavity for assembling outer rotor 1 and inner rotor 2, the top of cycloidal pump body 6 is equipped with oil inlet, and the bottom of diesel engine end cover is equipped with oil outlet, and the oil inlet and oil outlet are in communication with the hydraulic oil cavity;Outer rotor 1 is rotatably installed in the hydraulic oil cavity, and inner rotor 2 is eccentrically assembled on pump shaft 8, and the outer gear of inner rotor 2 is engaged with the inner gear of outer rotor 1.

[0006] The double pump for tractor described above, wherein, further including: bolt 3, a plurality of first screw assembly holes are formed on gear pump 4, a plurality of second screw assembly holes are formed on cycloidal pump body 6, and each bolt 3 is sequentially threaded through a first screw assembly hole and a second screw assembly hole and then assembled on the diesel engine end cover.

[0007] The double pump for tractor described above, wherein, further including: gear sleeve 7, pump shaft 8 is square shaft, and gear sleeve 7 is assembled on pump shaft 8 and located in the hydraulic oil cavity.

[0008] The double pump for tractor described above, wherein, gear sleeve 7 and pump shaft 8 are connected by a key.

[0009] The double pump for tractor has the following beneficial effects compared with the prior art:

[0010] The double pump for tractor has the following beneficial effects compared with the prior art:

[0011] The double pump for tractor has the following beneficial effects compared with the prior art:

[0012] The double pump for tractor has the following beneficial effects compared with the prior art:

[0013] The double pump for tractor has the following beneficial effects compared with the prior art:

[0014] The double pump for tractor has the following beneficial effects compared with the prior art:

[0015] The double pump for tractor has the following beneficial effects compared with the prior art:

[0016] (1) The gear pump and the cycloid hydraulic pump share one pump shaft, i.e. the output shaft of the engine, so that the engine can drive the gear pump and the cycloid hydraulic pump to run simultaneously during the running process, thereby realizing the functions of the gear pump and the cycloid hydraulic pump;

[0017] (2) The cycloid hydraulic pump has only one third of the length of the gear pump, and is suitable for use in an environment with strict space requirements and small pressure and displacement requirements, and is especially suitable for a rear axle hydraulic oil heat dissipation pump of a high-horsepower tractor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure schematic view of a double pump for tractor without assembling an outer end cover.

[0019] Figure 2 is a lateral sectional view of a double pump for tractor.

[0020] In the accompanying drawings: 1. Outer rotor; 2. Inner rotor; 3. Bolt; 4. Gear pump; 5. Spacer sleeve; 6. Cycloid pump body; 7. Gear sleeve; 8. Pump shaft; 9. O-ring; 10. Cylindrical pin. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0022] Please refer to Figure 1 and Figure 2 As shown, a double pump for a tractor is shown, which includes: a gear pump 4 and a cycloid hydraulic pump. The pump shaft 8 of the diesel engine passes through the cycloid hydraulic pump and is connected to the input end of the gear pump 4. The cycloid hydraulic pump includes: a cycloid pump body 6, an outer rotor 1 and an inner rotor 2. The cycloid pump body 6 is arranged between the diesel engine and the gear pump 4. The front side of the cycloid pump body 6 is provided with a hydraulic oil chamber for assembling the outer rotor 1 and the inner rotor 2. The top of the cycloid pump body 6 is provided with an oil inlet, and the bottom of the diesel engine end cover is provided with an oil outlet. Both the oil inlet and the oil outlet are connected to the hydraulic oil chamber; the outer rotor 1 is rotatably installed in the hydraulic oil chamber, and the inner rotor 2 is eccentrically assembled on the pump shaft 8. The outer teeth of the inner rotor 2 are meshed with the inner teeth of the outer rotor 1.

[0023] Furthermore, in a preferred embodiment, it also includes: a bolt 3, a plurality of first screw assembly holes are opened on the gear pump 4, and a plurality of second screw assembly holes are opened on the cycloid pump body 6. Each bolt 3 passes through a first screw assembly hole and a second screw assembly hole in sequence and is assembled on the diesel engine end cover.

[0024] Furthermore, in a preferred embodiment, it further comprises: a gear sleeve 7, the pump shaft 8 is a square shaft, the gear sleeve 7 is assembled on the pump shaft 8 and is arranged in the hydraulic oil chamber.

[0025] Furthermore, in a preferred embodiment, the gear sleeve 7 and the pump shaft 8 are connected by a key.

[0026] Furthermore, in a preferred embodiment, it also includes: a cylindrical pin 10, one end of the cylindrical pin 10 is connected to the outer wall of the gear sleeve 7, and the other end of the cylindrical pin 10 is connected to the inner wall of the inner rotor 2. The eccentric setting of the inner rotor 2 is achieved by assembling the cylindrical pin 10 between the inner rotor 2 and the gear sleeve 7.

[0027] Furthermore, in a preferred embodiment, it further comprises: a spacer sleeve 5 , which is mounted on the pump shaft 8 , and is disposed between the front end cover of the gear pump 4 and the gear sleeve 7 .

[0028] Further, in a preferred embodiment, further comprising: an O-shaped sealing ring 9, the front side of the gerotor pump body 6 is provided with an assembly groove for assembling the O-shaped sealing ring 9, the O-shaped sealing ring 9 is arranged around the hydraulic oil cavity, and the gerotor pump body 6 and the diesel engine end cover are sealed through the O-shaped sealing ring 9.

[0029] Further, in a preferred embodiment, the number of inner teeth of the outer rotor 1 is at least one more than the number of outer teeth of the inner rotor 2.

[0030] Further, in a preferred embodiment, the outer teeth of the inner rotor 2 farthest from the pump shaft 8 axis are engaged with the inner teeth of the outer rotor 1, and the outer teeth of the inner rotor 2 closest to the pump shaft 8 axis are provided with a gap for accommodating oil.

[0031] Further, in a preferred embodiment, the outer rotor 1 and the pump shaft 8 are coaxially arranged.

[0032] The above is only a preferred embodiment of the utility model, and does not limit the implementation mode and protection scope of the utility model.

[0033] The utility model further has the following implementation modes on the basis of the above:

[0034] In a further embodiment of the utility model, the double pump is composed of a gear pump 4 at the front end and a gerotor hydraulic pump, they share a pump shaft 8 to realize the function of double pumps. Compared with other double pumps, the utility model has smaller size, the gerotor hydraulic pump added at the front end is only one third of the length of the gear pump 4, and is suitable for use in an environment with small pressure and displacement requirements and strict space requirements.

[0035] In a further embodiment of the utility model, the utility model can be installed at the front end of the gear chamber of a motor, and replace the double pump, without the need of a switching device and a driving device specially arranged for the hydraulic pump.

[0036] In a further embodiment of the utility model, the gerotor hydraulic pump is composed of a gerotor pump body 6, an outer rotor 1, an inner rotor 2, a gear sleeve 7 and a cylindrical pin 10.

[0037] The further embodiment of the utility model discloses, working principle: when the engine runs and drives the pump shaft 8 of gear pump 4 rotation, further drive inner rotor 1 and outer rotor 2 rotation, inner rotor 1 and outer rotor 2 form multiple sealing cavities of different sizes with diesel engine end cover, when the cavity moves to the oil inlet side along with inner rotor 1 rotation, inner rotor 1 continues to rotate, and the cavity volume gradually increases, forms vacuum, and makes hydraulic oil enter from the oil inlet, when the cavity filled with hydraulic oil moves to the oil outlet along with inner rotor 1 rotation, inner rotor 1 continues to rotate, and the cavity volume gradually reduces, and hydraulic oil is extruded from the pump body, and through the continuous rotation of rotor, the sealed cavity continuously repeats the process of increasing to reducing, to make the pump can continuously suck and discharge hydraulic oil, and further provide stable continuous fluid flow.

[0038] The further embodiment of the utility model discloses, as shown in Figure 1 It is an embodiment of a double pump for tractor, and the number of inner teeth of inner rotor 1 is 11, and the number of outer teeth of outer rotor 2 is 10, Figure 1 As shown in the state, the outer tooth at the lowermost end of outer rotor 2 is engaged with the inner tooth groove at the lowermost end of inner rotor 1, and the outer tooth at the uppermost end of outer rotor 2 is attached to the inner tooth at the uppermost end of inner rotor 1 or has a little gap,

[0039] The further embodiment of the utility model discloses, gear pump 4 and cycloidal hydraulic pump share a pump shaft 8, i.e. the output shaft of engine, and the engine can drive gear pump 4 and cycloidal hydraulic pump to run simultaneously in the running process, realizes the function of gear pump 4 and also realizes the function of cycloidal hydraulic pump, and the cycloidal hydraulic pump is only one third of the length of gear pump 4, is suitable for the use environment of strict space requirement and little pressure and displacement requirement, does not need to set up hydraulic pump specially, and is especially suitable for the rear axle hydraulic oil heat dissipation pump of high-horsepower tractor.

[0040] The further embodiment of the utility model discloses, outer rotor 1 and inner rotor 2 are arranged as shown in Figure 1 Through the differential rotation of outer rotor 1 driven by eccentric inner rotor 2, the function of cycloidal hydraulic pump is realized.

[0041] The further embodiment of the utility model discloses, the arrangement position of oil inlet and oil outlet and the pipeline communication position as shown in Figure 2As shown, the oil inlet and the oil outlet are communicated with the hydraulic oil cavity, when the external teeth of the inner rotor 2 at the bottom end and the internal teeth of the outer rotor 1 are engaged, there is a cavity between the inner rotor 2 at the top end and the outer rotor 1, and the oil inlet is communicated with the cavity; when the external teeth of the inner rotor 2 at the top end and the internal teeth of the outer rotor 1 are engaged, there is a cavity between the inner rotor 2 at the bottom end and the outer rotor 1, and the oil outlet is communicated with the cavity; when the cavity moves to the oil inlet side with the rotation of the inner rotor 1, the inner rotor 1 continues to rotate, the cavity volume gradually increases, vacuum is formed, the hydraulic oil enters from the oil inlet, when the cavity filled with hydraulic oil moves to the oil outlet side with the rotation of the inner rotor 1, the inner rotor 1 continues to rotate, the cavity volume gradually decreases, the hydraulic oil is extruded out of the pump body, through the continuous rotation of the rotor, the sealing cavity continuously repeats the process of increasing to decreasing, so that the pump can continuously suck and discharge the hydraulic oil, and further provide stable and continuous fluid flow.

[0042] The above are only the preferred embodiments of the present application, and are not intended to limit the embodiments and protection scope of the present application. For those skilled in the art, it should be realized that any equivalent replacement and obvious change made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. A double pump for a tractor, characterized in that: include: A gear pump (4) and a cycloid hydraulic pump are provided. The pump shaft (8) of the diesel engine passes through the cycloid hydraulic pump and is connected to the input end of the gear pump (4). The cycloid hydraulic pump comprises a cycloid pump body (6), an outer rotor (1) and an inner rotor (2). The cycloid pump body (6) is arranged between the diesel engine and the gear pump (4). A hydraulic oil chamber for assembling the outer rotor (1) and the inner rotor (2) is provided on the front side of the cycloid pump body (6). An oil inlet is provided on the top of the cycloid pump body (6). An oil outlet is provided on the bottom of the diesel engine end cover. Both the oil inlet and the oil outlet are connected to the hydraulic oil chamber. The outer rotor (1) is rotatably installed in the hydraulic oil chamber. The inner rotor (2) is eccentrically installed on the pump shaft (8). The outer teeth of the inner rotor (2) are meshed with the inner teeth of the outer rotor (1).

2. The double pump for tractors according to claim 1, characterized in that: Also includes: The bolt (3) is provided with a plurality of first screw assembly holes on the gear pump (4), and the cycloid pump body (6) is provided with a plurality of second screw assembly holes. Each bolt (3) is sequentially passed through a first screw assembly hole and a second screw assembly hole and then assembled on the diesel engine end cover.

3. The double pump for tractors according to claim 1, characterized in that: Also includes: The gear sleeve (7) and the pump shaft (8) are square shafts. The gear sleeve (7) is assembled on the pump shaft (8) and is arranged in the hydraulic oil chamber.

4. The double pump for tractors according to claim 3, characterized in that: The gear sleeve (7) and the pump shaft (8) are connected via a key.

5. The double pump for tractors according to claim 3, characterized in that: Also includes: A cylindrical pin (10) is connected at one end to the outer wall of the gear sleeve (7), and at the other end to the inner wall of the inner rotor (2). The eccentric setting of the inner rotor (2) is achieved by assembling the cylindrical pin (10) between the inner rotor (2) and the gear sleeve (7).

6. The double pump for tractors according to claim 4, characterized in that: Also includes: A spacer sleeve (5) is installed on the pump shaft (8), and the spacer sleeve (5) is arranged between the front end cover of the gear pump (4) and the gear sleeve (7).

7. The double pump for tractors according to claim 1, characterized in that: Also includes: An O-type sealing ring (9) is provided on the front side of the cycloid pump body (6) for assembling an assembly groove for the O-type sealing ring (9). The O-type sealing ring (9) is arranged around the hydraulic oil chamber. The cycloid pump body (6) and the diesel engine end cover are sealed by the O-type sealing ring (9).

8. The double pump for tractors according to claim 1, characterized in that: The number of internal teeth of the outer rotor (1) is at least one greater than the number of external teeth of the inner rotor (2).

9. The double pump for tractors according to claim 5, characterized in that: The outer teeth of the inner rotor (2) farthest from the axis of the pump shaft (8) mesh with the inner teeth of the outer rotor (1), and a gap for accommodating oil is provided between the outer teeth of the inner rotor (2) closest to the axis of the pump shaft (8) and the inner teeth of the outer rotor (1).

10. The double pump for tractors according to claim 1, characterized in that: The outer rotor (1) and the pump shaft (8) are coaxially arranged.

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