JPH057021U - Hydraulic pump in work vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the thickness and cost of the hydraulic pump in the work vehicle. [Structure] A hydraulic pump 74 is provided with pump gears 77 and 79,
A case portion 80 that opens the inner side surfaces of the gear portions 77 and 79 and covers the outer side surfaces thereof.
The open surface of 0 is fixed to the mission case 3s in an oiltight manner. Then, the oil in the mission case 3 is sucked by the gear portions 77 and 79 through the filter 93, the passage 95, and the suction port 89, and the required portion is supplied from the discharge port.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work vehicle such as a rice transplanter, and more particularly to a hydraulic pump mounted outside a transmission case to which power from an engine is transmitted.

[0002]

[Prior Art]

 In the past, when installing a hydraulic pump in a transmission case that transmits power from an engine in a passenger rice transplanter, etc., a fully assembled hydraulic pump was attached to the outside of the transmission case. Further, this hydraulic pump is formed of a pump body portion, a bearing support portion, and a suction portion is also formed on the hydraulic pump side.

[0003]

[Problems to be solved by the device]

 However, in the fully assembled hydraulic pump as described above, bearing support portions are required on both sides of the pump body portion, and there is a drawback that the number of parts is large and the cost is high. In addition, since it is necessary to form the suction part on the hydraulic pump side, a large volume is required, and the height (thickness) of the hydraulic pump becomes high. Therefore, when installing it outside the mission case, place it. Depending on the position, there is a drawback that it may come into contact with the tires of passenger rice transplanters.

Therefore, an object of the present invention is to provide a hydraulic pump for a working vehicle that solves the above-mentioned problems by sharing the bearing support portion on the drive side of the hydraulic pump with the side surface of the mission case.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above circumstances, and is provided with a transmission (G) to which the dynamic force from the engine (1) is transmitted, and is provided outside the transmission case (3s) that stores the transmission (G). In the working vehicle (P), the hydraulic pump (74) is attached to the side surface, and the power from the engine (1) is transmitted to the gear parts (77, 79) of the pump (74). 74) comprises a pump gear part (77, 79) and a case part (80) which opens one side surface of the gear part (77, 79) and covers the other side surface thereof. The open surface is fixed to the mission case (3s) in an oiltight manner.

[0006]

[Action]

 Based on the above configuration, the work vehicle (P) transmits power from the engine (1) by the transmission (G). The pump gear parts (77, 79) of the hydraulic pump (74) mounted on the outer surface of the transmission case (3s) of the transmission (G) are driven by the engine (1). At this time, the inner shaft support parts (77a, 79a) of the pump gear parts (77, 79) are pivotally supported by the mission case (3s), and the outer shaft support parts (77c, 77c) of the pump gear part (77, 79) are supported. 79b) is pivotally supported by a case portion (80) that is oil-tightly fixed to the mission case (3s).

[0007]

[Effect of the device]

 As described above, according to the present invention, one side surface of the gear portion (77, 79) for the hydraulic pump is opened and the other side surface is covered by the case portion (80), and the case portion (80) is formed. Since the open surface of is fixed to the mission case (3s) in an oil-tight manner, one side surface of the gear part (77, 79) is omitted, so that significant space saving and cost reduction can be achieved. Further, by omitting one side surface of the gear part (77, 79), the height (thickness) of the hydraulic pump (74) is reduced, and the suction part (93, 95) is also provided in the mission case (3). Can be replaced with, the width of the mission case (3) can be reduced, and the airframe (19) can be made compact. Further, the performance of the hydraulic pump (74) can be grasped by the case portion (80), and the maintenance can be facilitated by removing the case portion (80).

It should be noted that the reference numerals in the parentheses refer to the drawings and do not limit the configuration of the present invention.

[0009]

【Example】

 Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

As shown in FIGS. 5 to 7, the passenger rice transplanter P has a machine body 19 including an engine 1, a mission case 3, a frame 17, and the like. Behind the machine body 19, a lifting link 20 is provided. The rice transplanter 21 is supported via the planter 22. A planter 22 and a float 23 are attached to the lower part of the rice transplanter 21. Further, the transmission case 3 has lateral axle housings 25a and 25b projecting from both sides, and vertical axle housings 26a and 26b are fixed to the lateral axle housings 25a and 25b so as to face downward (a little diagonally outward and outward). Has been done. The vertical axle housings 26a and 26b are elastically expandable and contractible, and the front wheels 27 and 27 are pivotally supported at the lower ends. A drive shaft 29 extends rearward from the lower rear end of the mission case 3 along the lower surface of the frame 17, and the drive shaft 29 is connected to a rear axle housing 30. Rear missions 31a and 31b are provided at both ends of the rear axle housing 30, and rear wheels 32 and 32 composed of paddy wheels are pivotally supported by the rear missions 31a and 31b. A clutch and a brake are provided in the rear axle housing 30, so that the rear wheels 32, 32 are independently powered and disconnected from each other, and the brakes are applied. Further, a PTO shaft 33 extends rearward from the upper rear end of the mission case 3, and the power from the transmission device G (see FIG. 1) in the mission case 3 is transmitted to the planter 22 and the like via the propeller shaft 35. It is being transmitted.

Next, the transmission device G in the mission case 3 will be described with reference to FIG. 1. The transmission case 3 is divided into two parts at substantially the center, and they are integrally assembled by bolts and nuts. The left end of the main shaft A projects to the outside of the transmission case 3, the driven pulley 9 is attached, and a collar 36 is provided in the middle of the main shaft A. A sleeve 37 is provided between the collar 36 and the left bearing. The axial movement of the sleeve 37 is restrained and the spindle 37 is axially supported by the main shaft A. The sleeve 37 is integrally provided with a shift gear 39 and a gear 40. A clutch case 41 is attached to the right side portion of the main shaft A via a spline or the like so as to be movable in the axial direction, and a main clutch 42 is formed between the clutch case 41 and the sleeve 37. A sleeve 43 is fixed to the planter shaft D by a spline or the like. A gear 45 is axially slidably attached to the outer circumference of the sleeve 43 by a spline or the like, and a gear 45 is attached to an inner end of the sleeve 43. 46 is attached. A bevel gear 47 is attached to the right side of the center of the planter shaft D so as to be rotatable relative to the planter shaft D, and a torque limiter 49 is formed between the bevel gear 47 and the planter shaft D. The shift gear 39 has a smaller number of teeth than the gear 40, and when the gear 45 meshes with the shift gear 39 or the gear 40, the stock shift can be performed with respect to the planter shaft D. The bevel gear 47 meshes with the bevel gear of the PTO shaft 33.

A gear 50 is axially slidably attached to the left end of the transmission shaft B, and a twin gear 51 having gears 51a and 51b is axially slidably attached to the right part. A bevel gear 52 meshing with the bevel gear of the drive shaft 29 (see FIG. 7) is fixed to the left part of the speed change shaft C, and a gear 53a meshing with the gear 51a is fixed to the right part of the speed change shaft C. A gear 53b that meshes with the gear 51b is fixed. A gear 56 that meshes with the gear 55a of the differential gear case 55 is fixed to an intermediate portion of the transmission shaft C. Front wheels 27, 27 are driven on both sides of the differential gear case 55 via drive shafts in the axle housings 25a, 25b, 26a, 26b (see FIG. 5).

Next, the belt type continuously variable transmission 2 will be described with reference to FIG. 3. A hydraulic drive pulley 7 is fixed to a base end portion of a drive shaft 5 which is an output shaft of the engine 1. A fixed sheave 6a of the drive pulley 6 is fixed to the drive shaft 5 outside the hydraulic drive pulley 7 by a key or the like. A movable sheave 6b is axially slidably attached to the outer boss portion of the fixed sheave 6a by a key or the like. A cam member 11 having a cam portion 11a is rotatably attached to the boss portion of the movable sheave 6b via a bearing or the like. The cam portion 11a has a plurality of spiral profiles on the circumferential surface centering on the shaft 5, and the roller member 12 rolling on the profile of the cam portion 11a is radially attached to the ring 12a. The ring 12a is rotatably attached to the outer end side of the boss portion of the fixed sheave 6a.

A cam portion 3a (having a shape similar to that of the cam portion 11a) centering on the main shaft A is provided on the outer surface of the mission case 3 so as to roll on the profile of the cam portion 3a. The roller member 15 is radially attached to the ring 15a. The ring 15a is rotatably attached to the boss portion of the movable sheave 9b of the driven pulley 9. The movable sheave 9b is axially slidably attached to the main shaft A with a key or the like, and the fixed sheave 9a is fixed to the end of the shaft A.

Further, the cam member 11, the roller member 12, the ring 12a and the like constitute a drive side adjusting device 13, and the cam portion 3a, the roller member 15, the ring 15a and the like constitute a driven side adjusting device 16. There is. An endless belt 10 is stretched around the drive pulley 6 and the driven pulley 9.

An arm 12c extending outward from the ring 12a is prevented from rotating by a pin 8a (screw-in pin) provided on a fixing member 8 protruding laterally from the engine or the like.

Next, the operating device 18 of the belt type continuously variable transmission 2 will be described with reference to FIGS. 4 and 3. The cam member 11 shown in FIG. An arm 15b is projectingly provided on 15a, and these arms 11b and 15b are connected by a link 14, and the shaft 5 and the shaft A, the arms 11b and 15b and the link 14 form a substantially parallelogram. ing. An arm 57 is pivotally supported by a pin 8a that prevents the arm 12c protruding from the ring 12a from rotating. A tight pulley 59 is pivotally supported by the tip of this arm 57, and a tension spring 60 is provided at the base end. The tension spring 60 is attached, and a predetermined tension is applied to the endless belt 10 via the tight pulley 59. Further, a mounting piece 62 is axially supported on the shaft 19 of the machine body 19 and a shaft 63 is mounted on the mounting piece 62. An operating piece 65a is axially supported on the shaft 63. An operation lever 65 is attached to 5a. A lever 66 is attached to the attachment piece 62, and the tip of the lever 66 and the tip of the arm 11b are connected by a rod 67 whose length is adjustable. Further, the operating piece 65a is provided with a protrusion 65b, and the protrusion 65b is engaged with the arm 69a of the reverse rotation switching shaft 69. When the sliding gear 50 provided on the transmission shaft B shown in FIG. 3 meshes with the gear 45 on the main shaft A, the machine body 19 moves forward and meshes with the gear 46 on the planter shaft D. The airframe 19 is designed to move backward.

As shown in FIG. 4B, the operating lever 65 is operated along a U-shaped guide 71. When moved right and left along the bottom of the guide 71, the right side (upper side in FIG. 4B) is the forward side, the left side is the reverse side, and the neutral position is midway. Further, when the operator switches between forward and backward movements and the lever 65 is moved forward, the speed is increased.

Next, the hydraulic pump will be described with reference to FIGS. 1, 2 and 3. A hydraulic pump driving pulley 7 a provided at the base end of the drive shaft 5 of the engine 1 shown in FIG. A belt 7a is stretched around a pulley 70 fixed to an end of the hydraulic pump shaft E shown in FIG. Note that FIG. 1 is a sectional development view, in which the hydraulic pump shaft E penetrates the front side portion of the mission case 3 and is axially supported by the mission case 3, and the hydraulic pump shaft E is of the drive shaft 5 of the engine 1. It is located below. The pump 74 includes gear parts 77 and 79 and a case part 80 that opens one side surface of the gear part and covers the other side surface. Further, the hydraulic pump oil E is axially supported by the right side portion 72 by a bearing 75 so that the center of the right end of the hydraulic pump shaft E substantially coincides with the center of the recess 73 of the right side portion 3s of the mission case 3. A locking hole 76 is provided on the right end surface of E. Further, as shown in FIG. 2 (c), the shaft 77a of the pump drive gear 77 is supported by the right side portion 72, and the tip of the shaft 77a is formed as a projection 77b having a plate-shaped cross section. The projection 77b is fitted in the locking hole 76. The driven gear 79 is engaged with the drive gear 77, and the driven gear 79 is axially supported on the right side portion 72 by a shaft 79a. A case 80 is provided so that the pump gears 77 and 79 cover the tips and outer surfaces of the teeth thereof. The shaft 77c of the gear 77 and the shaft 77c of the gear 77 are provided in the holes of the case 80 through the bushes 81 and 82. A shaft 79b of the gear 79 is pivotally supported. Then, the case 80 is attached to the right side portion 72 of the mission case 3 via the oil seal 83 in an oiltight manner by bolts or the like inserted into the plurality of holes 85 (see FIG. 2 (a)).

It should be noted that 86a, 86b and 86c are drain discharge ports, and a plug 87 is provided at the end of the drain discharge port 86c.

Reference numeral 89 shown in FIG. 2A is an inlet for sucking oil into the pump gears 77, 79, and 90 is an outlet for oil from the gears 77, 79. Further, reference numeral 91 shown in FIG. 2 (b) is a pressure regulating valve, and 91a is its guide. Then, the oil whose pressure has been adjusted is supplied to a required portion from the passage 92, and the oil returned from the pressure adjusting valve 91 is returned to the drain discharge port 86c. Further, reference numeral 93 shown in FIG. 1 is a filter for filtering the oil in the mission case 3, and the filtered oil flows into the suction port 89 through the passage 95.

Next, the operation of this embodiment will be described.

When the engine 1 is operated in the field, as the drive shaft 5 (see FIG. 3), which is the output shaft of the engine, rotates, the drive side pulley 6, the endless belt 10, and the driven side pulley 9 are used. , The spindle A is driven. Next, when the main clutch 42 is brought into contact, the gear 40 rotates, the bevel gear 47 is driven via the gear 45, the planter shaft D, and the torque limiter 49, and the PTO gear is engaged via the bevel gear 47. The shaft 33 (see FIGS. 6 and 7) is driven. At this time, if the gear 45 is meshed with the shift gear 39, the stock shift is performed (the stock distance is larger than that when the gear 40 is meshed).

Further, the rear wheels 32, 32 are driven at a low speed via the gear 40, the gear 50, the speed change shaft B, the gear 51 a, the gear 53 a, the speed change shaft C, the bevel gear 52, and the drive shaft 29. At this time, if the meshing of the gears 51a and 53a is switched to the meshing of the gears 51b and 53b, the rear wheels 32, 32 are driven at high speed.

The front wheels 27, 27 are driven by the gear 56 on the transmission shaft C meshing with the gear 55 a of the differential gear case 55. And, like the rear wheels 32, 32, it is possible to switch between high and low speed.

Further, when the gear 50 is moved to the right on the shift shaft B, the meshing with the gear 40 is broken to the neutral position, and when it is further moved to the right, the gear 46 is meshed with the gear 46 on the planter shaft D. (FIG. 1 is a developed view, so that it is displayed so as not to mesh). Then, low-speed reverse rotation is transmitted to the variable speed shaft B via the main shaft A, the main clutch 42, the gear 40, the gear 46, and the gear 50. Then, after this, in the same manner as when the vehicle is moving forward, the rotation at a lower speed than that when moving forward is transmitted to the front wheels 27, 27 and the rear wheels 32, 32.

Next, the operation of the belt type continuously variable transmission 2 and its operating device 18 will be described with reference to FIGS. 3, 4 (a) and 4 (b). When rotating around the shaft 63 at the bottom of the guide 71, the reverse rotation switching shaft 69 is rotated via the protrusion 65b and the arm 69a, the center is neutralized by the arm 59b, and the right end (upper end in FIG. 4B). Is set to forward and the left end is set to reverse. That is, the gears 40 and 50 mesh to move forward, and the gears 46 and 50 mesh to move backward. Next, when the operation lever 65 is turned in the forward or backward position along the guide 71, that is, when the shaft 61 is turned counterclockwise around the shaft 61 in FIG. 4A, the lever 66, the rod 67, and the link 14 are rotated. The arms 11b and 15b are rotated in the counterclockwise direction at substantially the same angle. The lift of the cam portion 11a is increased through the arm 11b, the cam member 11 is moved inward by the roller member 12, the movable sheave 6b is moved inward, and the roller member 15 is moved through the arm 15b. To a position where the lift is small, and the movable sheave 9b is moved inward (right side). Therefore, the endless belt 10 moves to the position shown on the outside in FIG. 3, and increases the rotation speed of the main shaft A more than the rotation speed of the drive shaft 5. Further, when the operation lever 65 is rotated clockwise in FIG. 4 (a), it moves to the position shown inside the shaft 5, A in FIG. The number is decelerated and transmitted to the input shaft A. Further, since the movement amount of the operation lever 65 can be made continuously variable, the belt type continuously variable transmission 2 can perform continuously variable gear shifting.

Next, the operation of the hydraulic pump will be described with reference to FIGS. 1 and 2. The oil in the mission case 3 is filtered by the filter 93, passes through the passage 95 and the suction port 89, and then passes through the gear 77, By the rotation of 79, the oil to be discharged is supplied to a required portion through the discharge port 90 and the passage 92. At this time, when the pressure exceeds a predetermined value, the oil is reliefed by the pressure regulating valve 91 and is discharged together with the oil leaking from the gears 77, 79 into the mission case 3 through the drain discharge ports 86c, 86b, 86a.

Driving the gears 77 and 79 will be described. A hydraulic pump is driven via a pulley 7, a belt 7 a (see FIG. 3), and a pulley 70 attached to the base end of the drive shaft 5 of the engine 1. The shaft E is rotated by the engine 1. Then, the drive gear 77 is rotated by the protrusion 77b at the end of the inner shaft 77a of the drive gear 77 fitted in the locking hole 76 at the end of the shaft E, and the driven gear 79 is rotated by this gear 77.

The gears 77, 79 are maintained by removing the case 80 from which the bolts and the like are removed. The bushes 81, 82 can be replaced at the same time.

[Brief description of drawings]

FIG. 1 is a developed sectional view of a mission according to an embodiment of the present invention.

2A is a front view showing the hydraulic pump, FIG. 2B is a sectional view taken along the line AA, and FIG. 2C is a sectional view taken along the line BB.

FIG. 3 is a sectional front view of the belt type continuously variable transmission.

4A is a side view of the operating device, and FIG. 4B is a plan view showing a guide of the operating lever.

FIG. 5 is a plan view showing the machine body.

FIG. 6 is a side view of the aircraft.

FIG. 7 is a side view of a riding rice transplanter embodying the present invention.

[Explanation of symbols]

 1 engine 3s mission case 74 pump 77, 79 gear part (driving gear, driven gear) 77a, 79a inner shaft support part (shaft) 77c, 79b outer shaft support part (shaft) 80 case part (case) 93, 95 suction part (filter) , Aisle) G Transmission (transmission device) P Working vehicle (passenger rice transplanter)

Claims (1)

Claims for utility model registration: 1. A transmission including power transmitted from an engine, wherein a hydraulic pump is mounted on an outer surface of a transmission case for accommodating the transmission, and the engine is attached to a gear portion of the pump. In a working vehicle in which the power from the engine is transmitted, the hydraulic pump comprises a pump gear part and a case part that opens one side surface of the gear part and covers the other side surface thereof. Hydraulically fixed to the mission case in a hydraulic pump in a working vehicle.