CN203730685U - Agricultural machine hydraulic stepless speed-change device - Google Patents
Agricultural machine hydraulic stepless speed-change device Download PDFInfo
- Publication number
- CN203730685U CN203730685U CN201420021932.XU CN201420021932U CN203730685U CN 203730685 U CN203730685 U CN 203730685U CN 201420021932 U CN201420021932 U CN 201420021932U CN 203730685 U CN203730685 U CN 203730685U
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- CN
- China
- Prior art keywords
- pump
- plunger
- motor
- plunger cylinder
- variable displacement
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an agricultural machine, in particular to an agricultural machine hydraulic stepless speed-change device. The agricultural machine hydraulic stepless speed-change device mainly solves the technical problem that a hydraulic stepless speed-change device in the prior art is low in machining accuracy and the like, and therefore the product mass production quality is stable. The agricultural machine hydraulic stepless speed-change device comprises a valve body (1) and a pump body (2), the pump body (2) is connected with an inner meshing gear pump (3), the inner meshing gear pump (3) is connected with a pump shaft (4), the pump shaft (4) is connected into a variable pump plunger cylinder (5) in a penetrated mode, a variable pump plunger (6) is connected into the variable pump plunger cylinder (5), the upper end of the variable pump plunger (6) is connected with a supporting disc (7), the supporting disc (7) is in contact with a spherical bushing (8), the upper end of the supporting disc (7) is provided with a rotary tilting tray (9), a motor shaft (10) is further arranged in the pump body (2), the motor shaft (10) is connected into a motor plunger cylinder (11) in a penetrated mode, a motor plunger (12) is connected into the motor plunger cylinder (11), and the upper end of the motor plunger (12) is in contact with a fixed tilting tray (13) through the supporting disc (7).
Description
Technical field
The utility model relates to a kind of farm machinery, especially relates to a kind of farm machinery hydraulic variable speed unit.
Background technique
Hydraulic variable speed unit is to rely on this medium of hydraulic oil that hydraulic system energy is handed on to realization, the difference of flow can realize the variation of motor rotary speed, being one of product that technology content is the highest in farm machinery hydraulic continuously variable transmission (HST), is the core component that farm machinery taking reaper as representative carries out variable speed operation.Its cardinal principle is to drive HST by engine power, and initiatively hydraulic pressure drives secondary hydraulic pressure by hydraulic oil, and the uninterrupted of controlling hydraulic oil is controlled the travelling speed of vehicle.The hydraulic transmission that its critical piece is made up of oil hydraulic pump and oil hydraulic motor, wherein, oil hydraulic pump flow can regulate, and is variable displacement pump.Hydraulic Power Transmission System is transferring power separately, the transferring power of also can connecting with mechanical gearbox.But the aspect precision such as the processing of this hydraulic variable speed unit are low, cause this product unstable in batch production quality.
Model utility content
The utility model is to provide a kind of farm machinery hydraulic variable speed unit, and it is mainly that to solve the aspect precision such as processing of prior art existing hydraulic variable speed unit low, causes the technical problem of this product in the unstable grade of batch production quality.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals:
Farm machinery hydraulic variable speed unit of the present utility model, comprise valve body and the pump housing, the described pump housing is connected with crescent gear pump, crescent gear pump is connected with pump shaft, pump shaft cross-under is in variable displacement pump plunger cylinder, in variable displacement pump plunger cylinder, be connected with variable displacement pump plunger, variable displacement pump plunger upper end is connected with supporting disk, supporting disk contact has spherical bushing, the upper end of supporting disk is provided with wobbler, in the pump housing, be also provided with motor drive shaft, motor drive shaft cross-under is in motor plunger cylinder, in motor plunger cylinder, be connected with motor plunger, motor plunger upper end has contacted fixing swash plate by supporting disk.
There is plunger assembly plunger cylinder inside, and plunger assembly pumps in plunger cylinder inside, and plunger cylinder adopts HB71 Cuprum alloy imported materials, after processing, can directly assemble and not need heat treatment.Plunger sphere end adopts the logical oil of shoulder hole, greatly reduces the difficulty of processing of part.Spherical bushing will have high abrasion resistance and form and position tolerance, the high manganese brass of its material selection Korea S independent research, and tensile strength is at 500 N/m
2above, after processing, do not need heat treatment.
Input shaft and output shaft are subject to rotational alternating load in the time of work, the frictional force of whole system and radial force are all carried on axle, the amount of deformation of axle directly affects the stability of system operation, and the heat treatment of axle is adopted to nitriding processing, makes it have the little and higher wear resistance of distortion.
As preferably, described variable displacement pump plunger cylinder, the lower end surface of motor plunger cylinder are provided with thrust plate.Thrust plate can play the effect of fluid flow.
As preferably, described variable displacement pump plunger cylinder, motor plunger cylinder is that HB71 Cuprum alloy is made.Plunger moves back and forth in cylinder interior, completes oil suction and force feed action.Plunger cylinder does not need heat treatment after adopting this kind of materials processing, eliminates the factor of heat treatment to plunger case body deformability.The friction factor of alloyed steel 20CrMoH and HB71 Cuprum alloy is little simultaneously, so can reduce 0.01 to the matching gap of plunger cylinder and plunger, can effectively improve the volumetric efficiency of variable displacement pump, enhances product performance.
As preferably, described variable displacement pump plunger, motor plunger head sphere end adopt shoulder hole, and port size is φ 2.5mm, and the degree of depth is 10mm, and the slenderness ratio in hole is 4mm, and hole base diameter is φ 1mm.Greatly reduce the difficulty of processing in hole.
As preferably, the Sphericity of described spherical bushing sphere is 0.01.Spline beat 0.02.Because supporting disk does reciprocal flip-flop movement on sphere, so sphere place requires to have high abrasion resistance.Its tensile strength of high manganese brass of Korea S's independent development is at 500N/m
2above, in material, manganese element is high, and material has high wear resistance.Adopt this kind of materials processing spherical bushing, after thick fine finishing, do not need to heat-treat technique.Therefore the distortion that can avoid heat treatment to cause with high manganese brass, effectively controls the precision of part.
As preferably, the input shaft of HST40 stepless speed variator and output shaft are subject to rotational alternating load in the time of work, and the frictional force of whole system and radial force are all carried on axle.The amount of deformation of axle directly affects the stability of system operation, and its surperficial wear resistance affects the life-span of axle.Select the heat treated mode of nitriding can effectively reduce the amount of deformation of axle, the surface abrasion resistance degree of raising axle to axle.
Therefore, the utility model pump and the motor one-piece type HST in same casing, compact structure, small-size light-weight, easy to maintenance, reach the object of the desirable speed of a motor vehicle by speed change lever shirtsleeve operation, plunger cylinder does not need heat treatment after adopting the processing of HB71 Cuprum alloy, eliminates the factor of heat treatment to plunger case body deformability.
Brief description of the drawings
Accompanying drawing 1 is a kind of structural representation of the present utility model.
Component, position and numbering in figure: valve body 1, the pump housing 2, crescent gear pump 3, pump shaft 4, variable displacement pump plunger cylinder 5, variable displacement pump plunger 6, supporting disk 7, spherical bushing 8, wobbler 9, motor drive shaft 10 motor plunger cylinders 11, motor plunger 12, fixing swash plate 13, thrust plate 14.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: the farm machinery hydraulic variable speed unit that this is routine, as Fig. 1, comprise valve body 1 and the pump housing 2, the pump housing is connected with crescent gear pump 3, crescent gear pump is connected with pump shaft 4, pump shaft cross-under is in variable displacement pump plunger cylinder 5, in variable displacement pump plunger cylinder, be connected with variable displacement pump plunger 6, variable displacement pump plunger upper end is connected with supporting disk 7, supporting disk contact has spherical bushing 8, the upper end of supporting disk is provided with wobbler 9, in the pump housing, be also provided with motor drive shaft 10, motor drive shaft cross-under is in motor plunger cylinder 11, in motor plunger cylinder, be connected with motor plunger 12, motor plunger upper end has contacted fixing swash plate 13 by supporting disk.The lower end surface of variable displacement pump plunger cylinder, motor plunger cylinder is provided with thrust plate 14.Variable displacement pump plunger cylinder, motor plunger cylinder are that HB71 Cuprum alloy is made.Variable displacement pump plunger, motor plunger head sphere end adopt shoulder hole, and port size is φ 2.5mm, and the degree of depth is 10mm, and the slenderness ratio in hole is 4mm, and hole base diameter is φ 1mm.The Sphericity of spherical bushing sphere is 0.01.
When use, crescent gear pump 3 provides repairing to variable displacement pump and motor.Prime mover drives pump shaft 4 to rotate, and when the wobbler 9 of variable displacement pump and pump shaft 4 are time in vertical position, pump shaft can only drive service pump work, not oil extraction of variable displacement pump, and at this moment reaper is in neutral gear position; In the time that the wobbler of variable displacement pump and pump shaft leave the certain angle of vertical position deflection, pump starts oil suction, force feed, the size of discharge capacity is determined by the angular dimension of variable displacement pump swash plate deflection, wobbler rotational hydraulic motor in 0 °～17 ° rotates to a direction, the larger variable pump delivery of forward angle is larger, and the rotating speed of motor is higher; Rotational hydraulic motor can be to counter-rotation in-17 °～0 ° for wobbler, and negative sense angle is larger, and variable displacement pump discharge capacity is larger, and the reverse speed of motor is higher.The high pressure oil completing after transformation of energy flows back to variable displacement pump, reciprocation cycle successively from motor oil extraction low-pressure cavity through valve piece low-pressure cavity.
The foregoing is only specific embodiment of the utility model, but structure characteristic of the present utility model is not limited to this, any those skilled in the art is in field of the present utility model, and the variation of doing or modification are all encompassed among the scope of the claims of the present utility model.
Claims (5)
1. a farm machinery hydraulic variable speed unit, comprise valve body (1) and the pump housing (2), it is characterized in that the described pump housing (2) is connected with crescent gear pump (3), crescent gear pump is connected with pump shaft (4), pump shaft cross-under is in variable displacement pump plunger cylinder (5), in variable displacement pump plunger cylinder, be connected with variable displacement pump plunger (6), variable displacement pump plunger upper end is connected with supporting disk (7), supporting disk contact has spherical bushing (8), the upper end of supporting disk is provided with wobbler (9), in the pump housing, be also provided with motor drive shaft (10), motor drive shaft cross-under is in motor plunger cylinder (11), in motor plunger cylinder, be connected with motor plunger (12), motor plunger upper end has contacted fixing swash plate (13) by supporting disk.
2. farm machinery hydraulic variable speed unit according to claim 1, is characterized in that described variable displacement pump plunger cylinder (5), the lower end surface of motor plunger cylinder (11) are provided with thrust plate (14).
3. farm machinery hydraulic variable speed unit according to claim 1 and 2, is characterized in that described variable displacement pump plunger cylinder (5), motor plunger cylinder (11) make for HB71 Cuprum alloy.
4. farm machinery hydraulic variable speed unit according to claim 1 and 2, it is characterized in that described variable displacement pump plunger (6), motor plunger (12) top sphere end adopt shoulder hole, port size is φ 2.5mm, the degree of depth is 10mm, the slenderness ratio in hole is 4mm, and hole base diameter is φ 1mm.
5. farm machinery hydraulic variable speed unit according to claim 1 and 2, is characterized in that the Sphericity of described spherical bushing (8) sphere is 0.01.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420021932.XU CN203730685U (en) | 2014-01-15 | 2014-01-15 | Agricultural machine hydraulic stepless speed-change device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420021932.XU CN203730685U (en) | 2014-01-15 | 2014-01-15 | Agricultural machine hydraulic stepless speed-change device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203730685U true CN203730685U (en) | 2014-07-23 |
Family
ID=51200762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420021932.XU Expired - Fee Related CN203730685U (en) | 2014-01-15 | 2014-01-15 | Agricultural machine hydraulic stepless speed-change device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203730685U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105715532A (en) * | 2016-04-06 | 2016-06-29 | 北京理工大学 | Parallel shaft type conjoined hydraulic pump motor |
-
2014
- 2014-01-15 CN CN201420021932.XU patent/CN203730685U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105715532A (en) * | 2016-04-06 | 2016-06-29 | 北京理工大学 | Parallel shaft type conjoined hydraulic pump motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20220115 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |