JP2013204693A - Paddy field working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paddy field working vehicle capable of efficiently cooling a lubricating oil.SOLUTION: A paddy field working vehicle includes: a front transmission case 3 provided in a front part of a machine body; a rear transmission case 4 provided in a rear part of the machine body; and a lubricating oil passage 14 circulating a lubricating oil between the front transmission case 3 and the rear transmission case 4. The lubricating oil passage 14 includes: a first lubricating oil passage 65 in which the lubricating oil flows from the front transmission case 3 to the rear transmission case 4; and a second lubricating oil passage 66 in which the lubricating oil flows form the rear transmission case 4 to the front transmission case 3.

Description

  More particularly, the present invention relates to a front transmission case provided at the front of the aircraft, a rear transmission case provided at the rear of the aircraft, and between the front transmission case and the rear transmission case. The present invention relates to a paddy field vehicle including a lubricating oil passage for circulating lubricating oil.

  For example, in the riding type rice transplanter (paddy field work vehicle) described in Patent Document 1, a transmission case (front transmission case) equipped with left and right front wheels so as to be steerable is connected to the front part of the body frame of the traveling body While being fixed, a rear transmission case (rear transmission case) equipped with rear wheels on the left and right is supported at the rear of the body frame. The transmission case and the rear transmission case are connected in communication with a housing that covers the transmission shaft, so that the lubricating oil can flow between the front transmission case and the rear transmission case. Lubricated with lubricating oil.

JP 2009-92169 A

  However, in the riding type rice transplanter described in Patent Document 1, lubricating oil is flowed by a single housing between the front transmission case and the rear transmission case. For this reason, in a single housing, lubricating oil that flows from the front transmission case side to the rear transmission case side and lubricating oil that flows from the rear transmission case side to the front transmission case side are mixed. That is, lubricating oils flowing in opposite directions are mixed in a single housing. Thereby, since it is difficult for the lubricating oil to circulate smoothly, the temperature of the lubricating oil tends to be uneven. Therefore, the lubricating oil could not be cooled efficiently.

  This invention is made | formed in view of the above situations, and it aims at providing the paddy field vehicle which can cool lubricating oil efficiently.

  The characteristic configuration of the paddy field vehicle according to the present invention includes a front transmission case provided at the front part of the aircraft, a rear transmission case provided at the rear part of the aircraft, and the front transmission case and the rear transmission case. A first lubricating oil passage through which lubricating oil flows from one side to the other side of the front transmission case and the rear transmission case, and the front transmission case. And a second lubricating oil passage through which lubricating oil flows from one side to the other side of the rear transmission case.

  According to this characteristic configuration, the lubricating oil passage is divided into the forward path and the backward path by the first lubricating oil path and the second lubricating oil path. Accordingly, since the circulation of the lubricating oil becomes smooth, unevenness in the temperature of the lubricating oil hardly occurs. Therefore, the lubricating oil can be efficiently cooled.

  According to a further feature of the paddy field vehicle according to the present invention, the front transmission case includes a continuously variable transmission case that houses a continuously variable transmission, a transmission case, and a front axle case that supports a front wheel, The rear transmission case includes a rear axle case that supports the rear wheel.

  According to this configuration, the lubricating oil is circulated between the continuously variable transmission, the transmission case, the front axle case, and the rear axle case by the lubricating oil passage. This lengthens the lubricating oil circulation path. Therefore, the lubricating oil can be efficiently cooled.

  A further characteristic configuration of the paddy field vehicle according to the present invention includes a charge pump that supplies hydraulic oil to the continuously variable transmission, and the charge pump pumps the lubricating oil circulated in the lubricating oil passage. It is in.

  According to this characteristic configuration, the charge pump supplies hydraulic oil to the continuously variable transmission and pumps the lubricating oil. Thereby, it is not necessary to provide a dedicated pump for pumping the lubricating oil. Therefore, the number of parts can be reduced.

  A further characteristic configuration of the paddy field vehicle according to the present invention is to include a stirring member for stirring the lubricating oil.

  According to this characteristic configuration, the circulation of the lubricating oil is promoted by the stirring member. Accordingly, since the circulation of the lubricating oil becomes smooth, unevenness in the temperature of the lubricating oil hardly occurs. Therefore, the lubricating oil can be efficiently cooled.

  A further characteristic configuration of the paddy field vehicle according to the present invention is that the front transmission case or the rear transmission case includes a blocking portion that forms a blocking chamber in which communication with the lubricating oil passage is blocked.

  According to this characteristic configuration, the lubricating oil in the shut-off chamber is not circulated by the lubricating oil passage. Thereby, the state in which the shut-off chamber is filled with the lubricating oil is maintained. Therefore, a member requiring reliable lubrication can be disposed in the shut-off chamber and reliably lubricated with the lubricating oil.

  According to a further feature of the paddy field vehicle according to the present invention, one of the front transmission case and the rear transmission case is configured to be relatively movable with respect to the other, and the lubricating oil passage includes the front transmission case and the It is in providing the movement permissible part which permits one relative movement to the other of the rear transmission case.

  According to this characteristic configuration, the relative movement of one of the front transmission case and the rear transmission case with respect to the other is permitted by the movement permission unit. For example, when the rear transmission case is configured to be able to roll around the axial center in the front-rear direction with respect to the front transmission case, relative movement of the rear transmission case with respect to the front transmission case is permitted by the movement allowing portion. Thereby, one relative movement with respect to the other of the front transmission case and the rear transmission case is not inhibited by the lubricating oil passage. Accordingly, one of the front transmission case and the rear transmission case can smoothly move relative to the other.

The side view which shows a riding type rice transplanter. The partial back sectional view which shows a front transmission case. The rear sectional view showing a front axle case. Sectional drawing which shows a cylindrical member. The plane sectional view showing a rear axle case. Side surface sectional drawing which shows a rolling support part. The top view which shows a lubricating oil channel | path typically. The top view which shows a lubricating oil channel | path. The side view which shows a 1st lubricating oil channel | path. The side view which shows a 2nd lubricating oil channel | path. The top view which shows the lubricating oil channel | path which concerns on 2nd embodiment. The side view which shows the 1st lubricating oil channel | path which concerns on 2nd embodiment. The side view which shows the 2nd lubricating oil channel | path which concerns on 2nd embodiment. The rear sectional view showing the front axle case according to another embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  First, the overall configuration of the riding type rice transplanter will be described with reference to FIG.

  As shown in FIG. 1, the riding type rice transplanter includes a traveling machine body 1, a driving unit 7, a fertilizer application device 10, a seedling planting device 11, an engine E, right and left spare seedling platforms 16, I have.

  The traveling machine body 1 is configured as a four-wheel drive type. The traveling machine body 1 includes a machine body frame 2, a front transmission case 3, and a rear transmission case 4.

  The front transmission case 3 is provided at the front portion of the body frame 2. The front transmission case 3 is provided with right and left front wheels 5. The inside of the front transmission case 3 is made into an oil bath with lubricating oil.

  The rear transmission case 4 is provided at the rear part of the body frame 2. The rear transmission case 4 is provided with right and left rear wheels 6. The rear transmission case 4 is made into an oil bath with lubricating oil.

  In addition, although mentioned later in detail, lubricating oil is circulated by the lubricating oil channel | path 14 between the front transmission case 3 and the rear transmission case 4 (refer FIG. 7).

  The driving unit 7 is provided on the traveling machine body 1. The driving unit 7 includes a steering handle 8 and a driver seat 9.

  The fertilizer application 10 is provided at the rear part of the traveling machine body 1. The fertilizer application 10 includes a blower 12. The blower 12 supplies a conveying wind for conveying the fertilizer.

  The seedling planting device 11 is provided behind the traveling machine body 1. The seedling planting device 11 is connected to the rear part of the traveling machine body 1 through a link mechanism 11a so as to be movable up and down. The link mechanism 11 a is driven by a hydraulic cylinder 13.

  The engine E is provided at the front portion of the traveling machine body 1. The engine E is covered with a bonnet 15.

  The preliminary seedling table 16 is provided at the front portion of the traveling machine body 1.

  Next, the front transmission case 3 will be described with reference to FIGS.

  As shown in FIGS. 2 and 3, the front transmission case 3 includes a continuously variable transmission case 17, a transmission case 18, and right and left front axle cases 19. The right and left front axle cases 19 have a symmetrical configuration. Accordingly, in the following, the left front axle case 19 will be mainly described, and the right front axle case 19 will be described as necessary.

  The continuously variable transmission case 17 houses a hydraulic continuously variable transmission 20 as a “continuously variable transmission”. Hydraulic oil is supplied to the hydraulic continuously variable transmission 20 by a charge pump 21 (see FIG. 7). The hydraulic continuously variable transmission 20 includes a hydraulic pump and a hydraulic motor (not shown).

  The hydraulic pump includes an input shaft (pump shaft) 20a. The power of the engine E is transmitted to the input shaft 20a by a belt (not shown). The input shaft 20a is provided with an input pulley 20b around which the belt is wound.

  The continuously variable transmission case 17 includes an oil supply port 17a and an oil discharge port 17b.

  The lubricating oil in the mission case 18 is supplied to the oil supply port 17a. That is, the continuously variable transmission case 17 is connected to the transmission case 18 via the fuel filler port 17a. The oil filler port 17 a is disposed on the right side surface of the continuously variable transmission case 17.

  The oil discharge port 17 b discharges the lubricating oil in the continuously variable transmission case 17. The oil discharge port 17 b is disposed on the rear surface of the continuously variable transmission case 17. That is, the oil discharge port 17 b is arranged on a different surface from the oil supply port 17 a in the continuously variable transmission case 17.

  The transmission case 18 houses a sub-transmission mechanism, a stock transmission mechanism, a differential device, and the like (not shown). The power of the hydraulic continuously variable transmission 20 is transmitted to the transmission case 18 (the auxiliary transmission mechanism, the inter-company transmission mechanism, the differential device, etc.). The power of the mission case 18 is transmitted to the right and left front wheels 5 via the right and left front axle cases 19. The power of the mission case 18 is transmitted to the seedling planting device 11 via a PTO shaft (not shown). Further, the power of the transmission case 18 is transmitted to the right and left rear wheels 6 via the transmission shaft 22 (see FIG. 1) and the rear axle case 23.

  The front axle case 19 includes a fixed case 24, a steering case 25, and a transmission shaft 26.

  The fixed case 24 is fixed to the mission case 18. Specifically, for example, with respect to the left fixed case 24, the right end surface of the fixed case 24 is fixed to the left side surface of the mission case 18. Further, a front joint portion 19a described later in detail is provided on the rear surface of the right fixed case 24. A front joint portion 19 a is also provided on the front surface of the left fixed case 24. Further, a transmission shaft 27 in the left-right direction of the machine body is rotatably supported inside the fixed case 24 via a bearing 28. The power of the mission case 18 is transmitted to the transmission shaft 27.

  Further, an oil supply port 24 b is provided at the upper part of the fixed case 24. The oil filler opening 24 b is plugged with a bolt 42. By removing the bolt 42 from the oil supply port 24b, it is possible to perform oil supply or oil inspection from the oil supply port 24b.

  The steering case 25 supports the front axle 5a of the front wheel 5 rotatably. The steering case 25 is supported by the lower part of the fixed case 24 so as to be swingable about the vertical axis Y. The steering case 25 is swingably supported by the fixed case 24 via the bush 44. The steering case 25 is connected to the steering handle 8 via a tie rod 29. When the steering handle 8 is operated, the steering case 25 is swung around the axis Y through the tie rod 29. Further, the upper portion of the steering case 25 and the fixed case 24 are sealed by a seal member 64.

  Further, an oil drain port 25 a is provided at the lower portion of the steering case 25. The oil discharge port 25 a is plugged with a bolt 43. By removing the bolt 43 from the oil discharge port 25a, the lubricating oil can be discharged from the oil discharge port 25a.

  The transmission shaft 26 is provided in the vertical direction across the inside of the fixed case 24 and the steering case 25. The transmission shaft 26 transmits power from the fixed case 24 side (power of the transmission shaft 27) to the front wheel 5. Specifically, the power of the transmission shaft 27 is transmitted to the transmission shaft 26 by the bevel gear 30 and the bevel gear 31. The power of the transmission shaft 26 is transmitted to the front wheels 5 by the bevel gear 32, the bevel gear 33, and the front axle 5a.

  The transmission shaft 26 is rotatably supported by the steering case 25 via a bearing 36, a bearing 37, and a bearing 38. A spacer 58 is provided between the bearing 36 and the bearing 37. The transmission shaft 26 is rotatably supported by the fixed case 24 via a bearing 34 and a bearing 35.

  The bearing 34 rotatably supports the upper end portion of the transmission shaft 26. The bearing 34 is prevented from being pulled upward by the bolt 39 and the washer 40. An insertion port 24 a is formed in the upper part of the fixed case 24. The insertion port 24a is disposed so as to face the bolt 39 and the washer 40 from above. The insertion port 24 a is covered with a cap 41. By removing the cap 41 from the insertion port 24a, a tool can be inserted from the insertion port 24a, and the bolt 39 can be tightened or loosened with this tool.

  Further, a cylindrical member 45, which will be described in detail later, is fitted on the transmission shaft 26. The lower portion of the fixed case 24 and the transmission shaft 26 (cylindrical member 45) are sealed with a first seal member 46. The space between the upper portion of the steering case 25 and the transmission shaft 26 (cylindrical member 45) is sealed by a second seal member 47.

  The cylindrical member 45 is interposed between the first seal member 46 and the second seal member 47 and the transmission shaft 26. The cylindrical member 45 is disposed between the bearing 35 and the bearing 36. The upper end surface of the cylindrical member 45 is in contact with the bearing 35. The lower end surface of the cylindrical member 45 is in contact with the bearing 36. That is, the cylindrical member 45 also serves as a spacer between the bearing 35 and the bearing 36.

  The cylindrical member 45 has a fitting hole 45a. The fitting hole 45a penetrates the cylindrical member 45 in the axial direction. The transmission shaft 26 is inserted into the insertion hole 45a.

  In addition, an oil passage 45 b is formed in the cylindrical member 45. The oil passage 45b allows the fixed case 24 and the steering case 25 to communicate with each other. In the present embodiment, four oil passages 45b are formed (see FIG. 4). The four oil passages 45b are arranged at equal intervals (90 degrees) with respect to the center O of the cylindrical member 45 when viewed in the axial direction (axial center Y direction) of the cylindrical member 45. The number of “oil passages” is not limited to the present embodiment. The oil passage 45b includes a vertical oil passage 45c, a first horizontal oil passage 45d, and a second horizontal oil passage 45e.

  The vertical oil passage 45c is formed so as to penetrate the cylindrical member 45 in the axial direction. The vertical oil passage 45c is formed along the outer periphery of the insertion hole 45a.

  The first horizontal oil passage 45 d is formed in the direction perpendicular to the axis of the cylindrical member 45. The first horizontal oil passage 45d communicates the upper end of the vertical oil passage 45c and the fixed case 24 (the space above the first seal member 46).

  The second horizontal oil passage 45 e is formed in the direction perpendicular to the axis of the cylindrical member 45. The second horizontal oil passage 45e allows the lower end portion of the vertical oil passage 45c and the steering case 25 (a space below the second seal member 47) to communicate with each other.

  With such a configuration, the lubricating oil flows between the fixed case 24 and the steering case 25 through the oil passage 45 b of the cylindrical member 45 as follows.

  That is, as shown in FIG. 3, the lubricating oil in the fixed case 24 (specifically, the space above the first seal member 46) flows through the bearing 35, and the first lateral oil passage 45d. To the oil passage 45b. In the oil passage 45b, the lubricating oil flows from the first lateral oil passage 45d through the vertical oil passage 45c and the second lateral oil passage 45e, and from the second transverse oil passage 45e to the steering case 25 (specifically, the second oil passage 45b). It flows out into the space below the seal member 47. Thereafter, the spilled lubricating oil flows through the bearing 36, the bearing 37 and the bearing 38. Note that the lubricating oil flows from the steering case 25 side to the fixed case 24 side along a path opposite to the above.

  Next, the rear transmission case 4 will be described with reference to FIGS. 5 and 6.

  As shown in FIGS. 5 and 6, the rear transmission case 4 includes a rear axle case 23. The rear axle case 23 is configured to be movable relative to the front transmission case 3. That is, the rear axle case 23 is configured to be able to roll around the axis X in the front-rear direction with respect to the front transmission case 3.

  Further, a right and left rear joint portion 23a, which will be described in detail later, is provided on the front wall of the rear axle case 23. The rear joint portion 23a is disposed on the inner side of the machine body (on the machine body center side) than the side clutch 52 in the left-right direction of the machine body. The rear joint portion 23 a is disposed on the upper portion of the rear axle case 23. (See FIGS. 9 and 10)

  An oil drain port 23 b is provided at the lower part of the rear axle case 23. The oil discharge port 23 b is plugged with a bolt 67. By removing the bolt 67 from the oil discharge port 23b, the lubricating oil can be discharged from the oil discharge port 23b.

  Further, the rear axle case 23 rotatably supports the rear axle 6a of the right and left rear wheels 6. In addition, a transmission shaft 48 in the left-right direction of the machine body is rotatably supported in the rear axle case 23. The power of the transmission shaft 49 in the longitudinal direction of the machine body is transmitted to the transmission shaft 48 by the bevel gear 50 and the bevel gear 51. The power of the transmission shaft 22 (see FIG. 1) is transmitted to the transmission shaft 49.

  The power of the transmission shaft 48 is transmitted to the gear 53 through the side clutch 52. The power of the gear 53 is transmitted to the relay shaft 55 by the gear 54. The power of the relay shaft 55 is transmitted to the rear wheel 6 by the gear 56, the gear 57 as “stirring member”, and the rear axle 6 a. The gear 57 agitates the lubricating oil in the rear axle case 23 by rotating.

  Here, the transmission shaft 49 is rotatably supported by the rolling support portion 59 via the bearing 60 and the bearing 61. The rolling support portion 59 is supported by the boss portion 62 so as to be swingable (rollable) around the axial center X in the front-rear direction. Further, the rolling support portion 59 is configured separately from the rear axle case 23. That is, the rolling support part 59 is detachably attached to the rear axle case 23. Specifically, the rolling support portion 59 is fixed to the front surface of the rear axle case 23 with a bolt 63. Further, the rolling support part 59 is provided with a positioning part 59a and a positioning part 59b. The positioning part 59a positions the bearing 60. Then, the positioning portion 59b positions the bearing 61.

  Thereby, since the rolling support part 59 can be removed from the rear axle case 23, the rolling support part 59 can be easily replaced when the rolling support part 59 is worn. Moreover, since the bearing 60 and the bearing 61 can be positioned by the rolling support part 59, the number of parts can be reduced. That is, it is not necessary to provide a dedicated positioning member for positioning the bearing 60 and the bearing 61.

  Next, the lubricating oil passage 14 will be described with reference to FIGS.

  As shown in FIGS. 7 to 10, the lubricating oil passage 14 circulates the lubricating oil between the front transmission case 3 and the rear transmission case 4. The lubricating oil circulated in the lubricating oil passage 14 is pumped by the charge pump 21. Further, the lower part of the front axle case 19 and the lower part of the rear axle case 23 are arranged lower than the lubricating oil passage 14.

  The lubricating oil passage 14 includes a first lubricating oil passage 65 and a second lubricating oil passage 66. The first lubricating oil passage 65 and the second lubricating oil passage 66 are arranged so as to be distributed to the left outer side and the right outer side of the body frame 2 with respect to the body frame 2 in a plan view. That is, the first lubricating oil passage 65 is arranged on the left side of the body frame 2. The second lubricating oil passage 66 is disposed on the right side of the body frame 2.

  In the first lubricating oil passage 65, lubricating oil flows from the front transmission case 3 side to the rear transmission case 4 side. The first lubricating oil passage 65 includes a first pipe 68 and a first rubber hose 69 serving as a “movement allowing portion”. The first lubricating oil passage 65 is connected to the oil outlet 17 b of the continuously variable transmission case 17 and the rear axle case 23. Specifically, the front end portion of the first pipe 68 is connected to the oil discharge port 17 b of the continuously variable transmission case 17. The rear end portion of the first rubber hose 69 is connected to the left rear joint portion 23 a of the rear axle case 23. The rear end portion of the first pipe 68 and the front end portion of the first rubber hose 69 are connected.

  The first pipe 68 is disposed on the front transmission case 3 side in the first lubricating oil passage 65. The first pipe 68 is, for example, a metallic tubular member. The rear end side of the first pipe 68 is supported on the body frame 2 side by the left support tool 70.

  The first rubber hose 69 is disposed on the rear transmission case 4 side in the first lubricating oil passage 65. The first rubber hose 69 is a flexible tubular member (for example, a rubber tubular member). The first rubber hose 69 allows the rear axle case 23 to move relative to the front transmission case 3. The first rubber hose 69 constitutes a part of the first lubricating oil passage 65. That is, the first lubricating oil passage 65 is not entirely constituted by a flexible tubular member (first rubber hose 69). The first rubber hose 69 is formed in a straight line in plan view.

  In the second lubricating oil passage 66, the lubricating oil flows from the rear transmission case 4 side to the front transmission case 3 side. The second lubricating oil passage 66 includes a second pipe 71 and a second rubber hose 72 serving as a “movement allowing portion”. The second lubricating oil passage 66 is connected to the front axle case 19 and the rear axle case 23. Specifically, the front end portion of the second pipe 71 is connected to the front joint portion 19 a of the right front axle case 19. The rear end portion of the second rubber hose 72 is connected to the right rear joint portion 23 a of the rear axle case 23. The rear end portion of the second pipe 71 and the front end portion of the second rubber hose 72 are connected.

  The second pipe 71 is disposed on the front transmission case 3 side in the second lubricating oil passage 66. The second pipe 71 is, for example, a metal tubular member. The rear end side of the second pipe 71 is supported on the body frame 2 side by the right support tool 70.

  The second rubber hose 72 is disposed on the rear transmission case 4 side in the second lubricating oil passage 66. The second rubber hose 72 is a flexible tubular member (for example, a rubber tubular member). The second rubber hose 72 allows the rear axle case 23 to move relative to the front transmission case 3. The second rubber hose 72 constitutes a part of the second lubricating oil passage 66. That is, the second lubricating oil passage 66 is not entirely constituted by a flexible tubular member (second rubber hose 72). The second rubber hose 72 is formed in a straight line in plan view.

  With such a configuration, the lubricating oil is circulated between the front transmission case 3 and the rear transmission case 4 through the lubricating oil passage 14 as follows.

  That is, the lubricating oil in the transmission case 18 is supplied to the continuously variable transmission case 17 from the oil supply port 17a. Then, the lubricating oil in the continuously variable transmission case 17 is discharged from the oil discharge port 17b to the first lubricating oil passage 65.

  In the first lubricating oil passage 65, the lubricating oil flows from the first pipe 68 to the first rubber hose 69. Then, the lubricating oil in the first rubber hose 69 flows into the rear axle case 23 from the left rear joint portion 23a. Then, the lubricating oil in the rear axle case 23 flows into the second lubricating oil passage 66 from the right rear joint portion 23a.

  In the second lubricating oil passage 66, the lubricating oil flows from the second rubber hose 72 to the second pipe 71. Then, the lubricating oil in the second pipe 71 flows into the right front axle case 19 from the right front joint portion 19a. Then, the lubricating oil in the right front axle case 19 is supplied to the continuously variable transmission case 17 from the oil supply port 17a again via the transmission case 18.

  Here, as shown in FIG. 3, the front axle case 19 is provided with a blocking portion 73. The interruption | blocking part 73 is comprised by the sealing member, for example. The blocking part 73 forms a blocking chamber 19 b in the front axle case 19. The shutoff chamber 19b is blocked from communicating with the lubricating oil passage 14. That is, the inside of the front axle case 19 is divided into two chambers of the communication chamber 19c and the blocking chamber 19b by the blocking portion 73. The communication chamber 19 c communicates with the lubricating oil passage 14.

  Thereby, as described above, the lubricating oil is circulated by the lubricating oil passage 14 between the front transmission case 3 and the rear transmission case 4, but in the front axle case 19, the lubricating oil in the communication chamber 19c is removed. The lubricating oil in the shutoff chamber 19b (particularly, the lubricating oil in the steering case 25) is not circulated by the lubricating oil passage 14 only by being lubricated by the lubricating oil passage 14.

  Lubricating oil can be supplied into the shutoff chamber 19b from the oil supply port 24b. The lubricating oil in the blocking chamber 19b can be drained from the oil drain port 25a.

  Further, as shown in FIG. 2, the front joint portion 19a is provided on the rear surface of the right fixed case 24 as described above. A front joint portion 19 a is also provided on the front surface of the left fixed case 24.

  That is, in plan view, when the left and right front axle case 19 is rotated by 180 degrees, the shape matches that of the left and right other front axle case 19. In other words, the right and left front axle cases 19 have a point-symmetric configuration in plan view. As a result, the right and left front axle cases 19 are shared between the left and right sides. The unused front joint portion 19a (in this embodiment, the front joint portion 19a of the left front axle case 19) is closed with a cap (not shown).

  Hereinafter, a second embodiment according to the present invention will be described.

  As shown in FIGS. 11 to 13, the lubricating oil passage 114 includes a first lubricating oil passage 165 and a second lubricating oil passage 166. Regarding the first lubricating oil passage 165 and the second lubricating oil passage 166, the intermediate portion in the longitudinal direction of the machine body is offset to the inside of the machine body from the front end part and the rear end part.

  The first lubricating oil passage 165 includes a first pipe 168 and a first rubber hose 169 as a “movement allowing portion”.

  The first pipe 168 is disposed so as to overlap the body frame 2 in plan view. The first pipe 168 is formed in a substantially crank shape in plan view. Specifically, the first pipe 168 includes a straight portion 168a. The straight portion 168a extends linearly in the longitudinal direction of the body along the lower surface of the body frame 2. Further, the first rubber hose 169 is curved so that its front end is close to the inside of the machine body in plan view.

  The second lubricating oil passage 166 includes a second pipe 171 and a second rubber hose 172 as a “movement allowing portion”.

  The second pipe 171 is arranged so as to overlap with the body frame 2 in plan view. The second pipe 171 is formed in a substantially crank shape in plan view. Specifically, the second pipe 171 includes a straight portion 171a. The straight portion 171a extends linearly in the longitudinal direction of the aircraft along the lower surface of the aircraft frame 2. Further, the second rubber hose 172 is curved so that its front end is close to the inside of the machine body in plan view.

  Here, right and left rear joint portions 123 a are provided on the front wall of the rear axle case 23. The right rear joint portion 123 a is connected to the second lubricating oil passage 166. The left rear joint portion 123a is connected to the first lubricating oil passage 165.

  At least a part of the rear joint portion 123a overlaps with the rear axle case 23 in plan view. That is, the front end face of the rear joint portion 123a is aligned with the front end face of the rear axle case 23 in the front-rear direction of the machine body (see FIGS. 12 and 13). Thereby, the part which the rear joint part 123a protrudes from the rear-axle case 23 is decreased.

  Hereinafter, another embodiment according to the present invention will be described.

  As shown in FIG. 14, an oil passage 26 a may be formed in the transmission shaft 26. Thereby, the total cross-sectional area of the oil passage can be increased by the oil passage 45 b of the cylindrical member 45 and the oil passage 26 a of the transmission shaft 26. The cylindrical member 45 (oil passage 45b) may be eliminated and only the oil passage 26a of the transmission shaft 26 may be used.

  Further, at least a part of the front joint portion 19a may overlap with the front axle case 19 in a plan view.

  Further, the “continuously variable transmission” may be a hydraulic mechanical continuously variable transmission (HMT).

  Further, the continuously variable transmission case 17 and the transmission case 18 may be provided in the rear axle case 23. In this case, the first lubricating oil passage 65 (165) is connected to the oil outlet 17 b of the continuously variable transmission case 17 and the front joint portion 19 a of the front axle case 19.

  Further, the front transmission case 3 may be configured to be movable relative to the rear transmission case 4. That is, the front transmission case 3 may be configured to be rollable with respect to the rear transmission case 4.

  Further, in place of the rolling suspension, a five-link suspension provided with a lateral rod may be used.

  Further, the “lubricating oil passage” is constituted by a single tubular member, and the tubular member is partitioned by a partition member to provide a “first lubricating oil passage” and a “second lubricating oil passage”. Good.

  Further, the rear transmission case 4 may be provided with a blocking portion 73.

  In addition, the “lubricating oil passage” is configured in such a manner that a metal tube, a rubber tube, and a metal tube are connected in order from the front so that the rubber tube is not disposed in the vicinity of the wheels (front wheel 5 and rear wheel 6) that are susceptible to mud. May be.

  Further, when the rear wheel 6 is a rigid (rigid axle suspension), the “lubricating oil passage” may be entirely composed of a metal pipe.

  In addition, with respect to the “lubricating oil passage”, a rubber hose as a “movement allowing portion” may be disposed on the front transmission case 3 side. In this case, the blocking portion 73 is eliminated and the entire front axle case 19 is made the communication chamber 19c, and the lubricating oil can be circulated throughout the entire front axle case 19 including the steering case 25.

  The machine body frame 2 itself may be a “lubricating oil passage”.

  Alternatively, the intake port of the blower 12 may face a route (lubricant passage 14 (114), etc.) through which the lubricating oil circulates, and hot air around the route through which the lubricating oil circulates may be taken into the fertilizer application apparatus 10. .

  The present invention includes a front transmission case provided at the front of the fuselage, a rear transmission case provided at the rear of the fuselage, a lubricating oil passage for circulating the lubricating oil between the front transmission case and the rear transmission case, It can be used for paddy field work vehicles equipped with.

DESCRIPTION OF SYMBOLS 3 Front transmission case 4 Rear transmission case 5 Front wheel 6 Rear wheel 14 Lubricating oil path 17 Continuously variable transmission case 18 Transmission case 19 Front axle case 19b Shut off chamber 20 Hydraulic stepless transmission (continuously variable transmission)
21 Charge pump 23 Rear axle case 57 Gear (stirring member)
65 First lubricating oil passage 66 Second lubricating oil passage 69 First rubber hose (movable portion)
72 Second rubber hose (movable part)
73 Blocking portion 114 Lubricating oil passage 165 First lubricating oil passage 166 Second lubricating oil passage 169 First rubber hose (movement allowance portion)
172 Second rubber hose (movable part)

Claims (6)

A front transmission case at the front of the aircraft,
A rear transmission case provided at the rear of the aircraft,
A lubricating oil passage for circulating lubricating oil between the front transmission case and the rear transmission case,
The lubricating oil passage is
A first lubricating oil passage through which lubricating oil flows from one side of the front transmission case and the rear transmission case to the other side;
A paddy field work vehicle comprising: a second lubricating oil passage through which lubricating oil flows from one side to the other side of the front transmission case and the rear transmission case. The front transmission case includes a continuously variable transmission case that houses a continuously variable transmission, a transmission case, and a front axle case that supports a front wheel,
The paddy-type work vehicle according to claim 1, wherein the rear transmission case includes a rear axle case that supports a rear wheel. A charge pump for supplying hydraulic oil to the continuously variable transmission;
The paddy work vehicle according to claim 2, wherein the charge pump pumps the lubricating oil circulated in the lubricating oil passage.   The paddy field vehicle according to any one of claims 1 to 3, further comprising a stirring member that stirs the lubricating oil.   The paddy-type work vehicle according to any one of claims 1 to 4, wherein the front transmission case or the rear transmission case includes a blocking portion that forms a blocking chamber in which communication with the lubricating oil passage is blocked. . One of the front transmission case and the rear transmission case is configured to be movable relative to the other,
The paddy field work vehicle according to any one of claims 1 to 5, wherein the lubricating oil passage includes a movement allowing portion that allows one relative movement of the other of the front transmission case and the rear transmission case.

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