Work vehicle

Abstract

To inexpensively detect revolving speed of a motor generator in a work vehicle where the motor generator is connected to a transmission that changes speed of power from an engine to output it to a travel unit.SOLUTION: A mission case 13 accommodating a transmission includes a wall part 37a into which revolving shafts 21a, 22a of motor generators 21, 22 are inserted. Rotors 41a, 42a of resolvers 41, 42 that detect revolving speed of the motor generators 21, 22 are fitted externally to the revolving shafts 21a, 22a. Stators 41b, 42b of the resolvers 41, 42 are supported by the wall part 37a.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] As shown in Patent Document 1, the engine and the running gear ( Transmission (hydrostatic transmission, planetary gear mechanism, forward / reverse switching device, gear shift device) and a motor generator connected to the transmission There are also work vehicles (hybrid work vehicles) equipped with a power plant and a power plant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-65349 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned work vehicle, the motor generator circuit is used to control the motor generator. The rotation speed must be detected.

[0005] The present invention provides a work vehicle that can inexpensively detect the rotation speed of a motor generator. do. [Means for solving the problem]

[0006] The work vehicle according to the present invention comprises: The vehicle is equipped with an engine, a transmission that changes the speed of power from the engine and outputs it to a traveling device, a motor generator connected to the transmission, and a resolver that detects the rotation speed of the motor generator, and a transmission case that houses the transmission is provided with a wall portion through which a rotating shaft of the motor generator is inserted, a rotor of the resolver is fitted onto the rotating shaft, and a stator of the resolver is supported by the wall portion. The resolver is disposed between the housing and the wall portion in a state where the resolver and the housing of the motor generator do not overlap in the radial direction of the rotary shaft, and the wall portion is provided with a support portion that protrudes toward the resolver and supports the stator, and the wall portion is provided with a motor support portion that protrudes toward the housing and supports the housing. are.

[0007] According to this configuration, the rotor can be rotated by the rotating shaft without providing a special interlocking mechanism for interlocking the rotating shaft and the rotor, and the stator can be supported by utilizing a wall portion of the member for supporting the stator, allowing the resolver to perform detection operations, so the rotational speed of the motor generator can be detected inexpensively.

[0008]

[0009] According to this configuration, the resolver and the housing are located close to each other, so that the space required for installing the resolver and the motor generator can be reduced.

[0010]

[0011] According to this configuration, the protruding support portion provides a gap between the resolver and the wall portion, and the gap can be used to cool the resolver.

[0012] In the present invention, The support portions are preferably provided at a plurality of locations on the wall portion that are distributed in the circumferential direction of the rotor.

[0013] According to this configuration, by providing the protruding support portions and distributing the support portions, gaps are provided between the resolver and multiple locations on the wall portion, which allows for cooling of the resolver. Furthermore, the presence of gaps improves workability when assembling the resolver.

[0014] In the present invention, It is preferable that a connecting bolt be provided to connect the stator to the support portion by inserting the stator in a direction along the axis of the rotating shaft from the side opposite to the side on which the wall portion is located.

[0015] According to this configuration, the stator is connected to the support portion by inserting the connecting bolt through the stator from the side opposite to the side where the wall portion is located in the direction along the axis of the rotating shaft and engaging it with the support portion, making it easy to connect the stator to the support portion.

[0016] In the present invention, In the wall portion, a portion located on the opposite side of the support portion from the side where the rotation shaft is located in the diameter direction of the rotation shaft is provided. the motor support portion It is preferable that the following is provided.

[0017] According to this configuration, the operation of supporting the stator on the support portion and the operation of supporting the motor generator on the motor support portion can be performed at locations that are offset in the diameter direction of the rotating shaft, making it easy to support the stator and motor generator on the wall portion.

[0018] In the present invention, It is preferable that an electric wire connector for extracting the detection information of the resolver is provided on a wall portion of the peripheral wall of the transmission case that faces forward and backward and extends along the longitudinal direction of the vehicle body.

[0019] According to this configuration, the electric wires can be connected to the electric wire connector from around the front and rear wall portions of the transmission case, making the connection easy.

[0020] In the present invention, It is preferable that an electric wire connecting the resolver and the electric wire connector is laid along the wall portion.

[0021] According to this configuration, it is easy to route the electric wires so that they do not come into contact with the motor generator.

[0022] In the present invention, It is preferable that the wall portion is formed with a wire fixing portion for fixing the wire.

[0023] According to this configuration, the electric wire is fixed to the electric wire fixing portion, and therefore the wall portion suppresses the swinging movement of the electric wire. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 2 is a side view showing the left side of the tractor. [Figure 2] FIG. 2 is a schematic diagram of a driving power transmission device. [Figure 3] FIG. 2 is a plan view showing a first motor generator, a second motor generator, a first resolver, and a second resolver. [Figure 4] FIG. 2 is a rear view showing the first support portion, the second support portion, the first motor support portion, and the second motor support portion. [Figure 5] FIG. 2 is a rear view showing the first resolver and the second resolver. [Figure 6] FIG. 4 is a side view showing the second electric wire. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings. In the following description, with respect to the traveling body of a tractor (an example of a "work vehicle"), the direction of arrow F shown in Fig. 1 is referred to as the "front of the body," the direction of arrow B shown in Fig. 1 as the "rear of the body," the direction of arrow U shown in Fig. 1 as the "upper side of the body," and the direction of arrow D shown in Fig. 1 as the "lower side of the body." The direction toward the front of the paper in Fig. 1 is referred to as the "left side of the body," and the direction toward the back of the paper in Fig. 1 as the "right side of the body." The left-right direction of the body is the width direction of the body.

[0026] [Overall configuration of the tractor] As shown in FIG. 1, a tractor has a traveling body 3 supported by a pair of left and right drivable front wheels 1 and a pair of left and right drivable rear wheels 2. The body frame 4 of the traveling body 3 is made up of an engine 5 provided at the front of the traveling body 3, a transmission case 13 connected to the rear of the engine 5, and a front frame 14 connected to the bottom of the engine 5. A power unit 6 having the engine 5 is provided at the front of the traveling body 3. A driver's unit 9 in which a driver sits is provided at the rear of the traveling body 3. The driver's unit 9 is provided with a driver's seat 7, a steering wheel 8 for steer- ing the front wheels 1, and a driver's cabin 10 that covers the riding space. A link mechanism (not shown) that connects a work implement such as a rotary tiller (not shown) so that it can be raised and lowered, and a power take-off shaft 12 that extracts and transmits power from the engine 5 to the connected work implement are provided at the rear of the transmission case 13. In this embodiment, the vehicle is provided with front wheels 1 and rear wheels 2 as traveling devices, but the traveling devices may be crawler traveling devices or a combination of wheels and mini crawler traveling devices.

[0027] [Traveling power transmission device] 2, the driving power transmission device 15 that transmits driving force to the front wheels 1 and rear wheels 2 includes a transmission case 13 connected to the rear of the engine 5, a transmission 20 housed in the transmission case 13 that changes the speed of the power from the engine 5 and outputs it to the front wheels 1 and rear wheels 2, and a first motor generator 21 and a second motor generator 22 connected to the transmission 20. The transmission case 13 is aligned with the engine 5 in the longitudinal direction of the vehicle body, and extends in the longitudinal direction of the vehicle body at the center in the lateral width direction.

[0028] As shown in FIG. 2, the transmission 20 is equipped with an input shaft 18 to which the power of the output shaft 5a of the engine 5 is transmitted via the flywheel 5b and the main clutch 16, a main transmission section 20A to which the power of the input shaft 18 is input, a forward / reverse switching section 27 to which the output of the main transmission section 20A is input, an auxiliary transmission section 28 to which the output of the forward / reverse switching section 27 is input, and a front wheel transmission section 30 to which the output of the auxiliary transmission section 28 is input.

[0029] 2, the main transmission unit 20A is provided with a low-speed transmission unit 23 and a high-speed transmission unit 24. In this embodiment, the low-speed transmission unit 23 and the high-speed transmission unit 24 are arranged side by side in the width direction of the vehicle body, but they may also be arranged side by side in the vertical direction of the vehicle body or in a direction inclined to the left or right when viewed in the front-rear direction of the vehicle body.

[0030] The low-speed transmission unit 23 and the high-speed transmission unit 24 are configured by planetary gear mechanisms. The low-speed transmission unit 23 includes a sun gear 23a, a planet gear 23b, a carrier 23c, and a ring gear 23d. The high-speed transmission unit 24 includes a sun gear 24a, a planet gear 24b, a carrier 24c, and a ring gear 24d.

[0031] A ring gear 23d of the low-speed transmission unit 23 is connected to an input shaft gear 48 provided on the input shaft 18 via an interlocking gear 23e. A low-speed output shaft 23g is connected to the carrier 23c of the low-speed transmission unit 23. A low-speed clutch 25 is provided across the low-speed output shaft 23g and a transmission gear 25a connected to an input shaft 50 of the forward / reverse switching unit 27. The low-speed clutch 25 is configured to be switchable between an engaged state in which the power of the low-speed output shaft 23g is transmitted to the input shaft 50, and a disengaged state in which power transmission from the low-speed output shaft 23g to the input shaft 50 is cut off. The input shaft 50 is connected to the transmission gear 25a by providing a transmission gear 55 on the input shaft 50 that meshes with the transmission gear 25a.

[0032] The carrier 24c of the high-speed transmission unit 24 is connected to the input shaft gear 48 via an interlocking gear 24e. A high-speed output shaft 24g is connected to the ring gear 24d of the high-speed transmission unit 24. A high-speed clutch 26 is provided between the high-speed output shaft 24g and a transmission gear 26a connected to an input shaft 50 of the forward / reverse switching unit 27. The high-speed clutch 26 is configured to be switchable between an engaged state in which the power of the high-speed output shaft 24g is transmitted to the input shaft 50, and a disengaged state in which the power transmission from the high-speed output shaft 24g to the input shaft 50 is cut off. The input shaft 50 is connected to the transmission gear 26a by meshing the transmission gear 26a with a transmission gear 55.

[0033] In this embodiment, the first motor generator 21 and the second motor generator 22 are arranged in the width direction of the vehicle body, but they can also be arranged in the vertical direction of the vehicle body or in a direction inclined to the left or right when viewed in the front-rear direction of the vehicle body.

[0034] 2, the first motor generator 21 is connected to the low-speed transmission unit 23 and the high-speed transmission unit 24 of the transmission 20. More specifically, the rotating shaft 21a of the first motor generator 21 is connected to the sun gear 23a of the low-speed transmission unit 23 and the sun gear 24a of the high-speed transmission unit 24. The rotating shaft 21a is connected to the sun gear 23a and the sun gear 24a by providing a rotating shaft gear 21b on the rotating shaft 21a, connecting a first transmission gear 23f to the sun gear 23a, connecting a second transmission gear 24f to the sun gear 24a, and providing a connecting member 19 that connects the rotating shaft gear 21b to the first transmission gear 23f and the second transmission gear 24f. The connecting member 19 is fitted onto the input shaft 18 so as to be rotatable relative to the input shaft 18. A transmission gear 32 that meshes with the rotating shaft gear 21b is provided at the front of the connecting member 19, and a transmission gear 49 that meshes with the first transmission gear 23f and the second transmission gear 24f is provided at the rear of the connecting member 19, making it possible to connect the rotating shaft gear 21b to the first transmission gear 23f and the rotating shaft gear 21b to the second transmission gear 24f via the connecting member 19.

[0035] 2, the second motor generator 22 is connected to the input shaft 18 of the transmission 20. More specifically, a transmission gear 22b is provided on the rotating shaft 22a of the second motor generator 22, and a transmission gear 31 that meshes with the transmission gear 22b is provided on the input shaft 18.

[0036] As shown in FIG. 2 , the first motor generator 21 is connected to a battery 73 via a first inverter 71. The first motor generator 21 and the first inverter 71 are connected by connecting electric wires extending from the first inverter 71 to terminals 76 provided on the first motor generator 21. The second motor generator 22 is connected to the same battery 73 as the battery 73 to which the first motor generator 21 is connected via a second inverter 72. The second motor generator 22 and the second inverter 72 are connected by connecting electric wires extending from the second inverter 72 to terminals 75 provided on the second motor generator 22. The first inverter 71 and the second inverter 72 are provided on the traveling vehicle body 3, allocated to the left and right sides of the transmission case 13. The battery 73 is provided on either side of the transmission case 13, on the side where the first inverter 71 or the second inverter 72 is located. In this embodiment, the same battery 73 is connected to the first motor generator 21 and the second motor generator 22, but it is possible to connect separate batteries to the first motor generator 21 and the second motor generator 22.

[0037] In the low-speed transmission section 23, the power of the input shaft 18 is transmitted to the ring gear 23d to drive the ring gear 23d, the driving force of the first motor generator 21 is transmitted to the sun gear 23a to drive the sun gear 23a, the power from the engine 5 and the driving force from the first motor generator 21 are combined to produce a low-speed combined power, and the low-speed combined power is output from the low-speed output shaft 23g.

[0038] In the high-speed transmission unit 24, the power of the input shaft 18 is transmitted to the carrier 24c to drive the planetary gear 24b, the driving force of the first motor generator 21 is transmitted to the sun gear 24a to drive the sun gear 24a, the power from the engine 5 and the driving force from the first motor generator 21 are combined to produce a high-speed combined power, which is output from the high-speed output shaft 24g. The high-speed combined power is a higher-speed combined power than the low-speed combined power produced by the low-speed transmission unit 23.

[0039] 2, the forward / reverse switching unit 27 includes an input shaft 50 connected to the low-speed clutch 25 via a transmission gear 25a and to the high-speed clutch 26 via a transmission gear 26a, a forward clutch 51 and a reverse clutch 52 provided on the input shaft 50. In the forward / reverse switching unit 27, the output of the low-speed transmission unit 23 is transmitted to the input shaft 50 via the low-speed clutch 25, and the output of the high-speed transmission unit 24 is transmitted to the input shaft 50 via the high-speed clutch 26. When the forward clutch 51 is switched on, the power of the input shaft 50 is converted into forward power by the forward clutch 51 and the forward transmission gear 53a and output from the output shaft 53. When the reverse clutch 52 is switched on, the power of the input shaft 50 is converted into reverse power by the reverse clutch 52, the reverse gear 54, and the reverse transmission gear 53b and output from the output shaft 53.

[0040] 2, the auxiliary transmission unit 28 includes an input gear 56 provided on the output shaft 53 of the forward / reverse switching unit 27, an output shaft 59 located rearward of the output shaft 53, and a shift gear 60 supported by the output shaft 59. The output shaft 53 is connected to the rear wheel differential mechanism 29.

[0041] In the auxiliary transmission unit 28, the output of the forward / reverse switching unit 27 is transmitted to the input gear 56. When the shift gear 60 is engaged with the side portion of the input gear 56, the power of the input gear 56 is transmitted to the output shaft 59 via the shift gear 60 and output from the output shaft 59, thereby establishing a high-speed transmission state. When the shift gear 60 is engaged with the side portion of the transmission gear 57 supported on the output shaft 59, the power of the input gear 56 is transmitted to the output shaft 59 via the transmission gear 58a, the transmission shaft 58, the transmission gear 58b, the transmission gear 57, and the shift gear 60, thereby establishing a low-speed transmission state.

[0042] As shown in Figure 2, the front wheel transmission unit 30 includes an input shaft 63 connected to the output shaft 59 of the sub-transmission unit 28 via a gear interlocking mechanism 47, and a constant speed clutch 61 and an accelerating clutch 62 provided on the input shaft 63.

[0043] In the front wheel transmission unit 30, the output of the auxiliary transmission unit 28 is transmitted to the input shaft 63. When the constant speed clutch 61 is engaged, the power of the input shaft 63 is changed to constant speed power by the constant speed clutch 61 and the constant speed gear mechanism 64a, transmitted to the output shaft 64, and output from the output shaft 64. The constant speed power is power that drives the front wheels 1 at the same speed as the rear wheels 2. When the speed-up clutch 62 is engaged, the power of the input shaft 63 is changed to increased speed power by the speed-up clutch 62 and the speed-up gear mechanism 64b, transmitted to the output shaft 64, and output from the output shaft 64. The increased speed power is power that drives the front wheels 1 at a higher speed than the rear wheels 2. The output shaft 64 of the front wheel transmission unit 30 is connected to a front wheel differential mechanism 66 via a rotating shaft 65.

[0044] In the traveling power transmission device 15, the front wheels 1 and the rear wheels 2 are driven by the power of the engine 5 and the driving force of the first motor generator 21.

[0045] That is, the first motor generator 21 is driven by power supplied from the battery 73 via the first inverter 71. The power from the engine 5 transmitted to the input shaft 18 and the power from the first motor generator 21 are combined into a low-speed combined power by the low-speed transmission unit 23. The power from the engine 5 transmitted to the input shaft 18 and the power from the first motor generator 21 are combined into a high-speed combined power by the high-speed transmission unit 24. When the low-speed clutch 25 is switched on and the high-speed clutch 26 is switched off, the low-speed combined power from the low-speed transmission unit 23 is transmitted to the input shaft 50 of the forward / reverse switching unit 27. When the low-speed clutch 25 is switched off and the high-speed clutch 26 is switched on, the high-speed combined power from the high-speed transmission unit 24 is transmitted to the input shaft 50 of the forward / reverse switching unit 27. When the forward clutch 51 is switched to on and the reverse clutch 52 is switched to off, the low-speed combined power or the high-speed combined power transmitted to the input shaft 50 of the forward / reverse switching unit 27 is converted into forward power in the forward / reverse switching unit 27 and transmitted to the input gear 56 of the subtransmission unit 28. When the forward clutch 51 is switched to off and the reverse clutch 52 is switched to on, the low-speed combined power or the high-speed combined power transmitted to the input shaft 50 of the forward / reverse switching unit 27 is converted into reverse power in the forward / reverse switching unit 27 and transmitted to the input gear 56 of the subtransmission unit 28. When the shift gear 60 of the subtransmission unit 28 is engaged with the side of the input gear 56, the forward power or the reverse power transmitted to the input gear 56 is changed in speed to high-speed power and output from the output shaft 59. When the shift gear 60 of the auxiliary transmission unit 28 engages with the side of the transmission gear 57, the forward power or reverse power transmitted to the input gear 56 is changed in speed to low-speed power and output from the output shaft 59. The high-speed power or low-speed power output from the output shaft 59 is transmitted to the rear wheel differential mechanism 29 and the front wheel transmission unit 30. When the constant-speed clutch 61 in the front wheel transmission unit 30 is switched on, the constant-speed power is transmitted from the front wheel transmission unit 30 to the front wheel differential mechanism 66, and when the speed-increasing clutch 62 is switched on, the increased-speed power is transmitted from the front wheel transmission unit 30 to the front wheel differential mechanism 66.

[0046] In the traveling power transmission device 15, when the front wheels 1 and the rear wheels 2 are driven, the power from the engine 5 transmitted to the input shaft 18 is transmitted to the rotating shaft 22a of the second motor generator 22, driving the second motor generator 22 to generate electricity. The electric power generated by the second motor generator 22 is supplied to the battery 73 via the second inverter 72, and the battery 73 is charged.

[0047] The first motor generator 21 functions primarily as an electric motor to drive the front wheels 1 and rear wheels 2, but also functions as a generator during deceleration. The second motor generator 22 functions primarily as a generator, but can be configured to function as an electric motor to drive the front wheels 1 and rear wheels 2.

[0048] [Motor generator, resolver] 2, the transmission case 13 is configured to be separable into a front case portion 36 located in front of the transmission case 13 and connected to the engine 5, a rear case portion 38 located in the rear of the transmission case 13, and an intermediate case portion 37 located between the rear case portion 38 and the front case portion 36. The rear case portion 38 accommodates the main transmission unit 20A, the forward / reverse switching unit 27, the rear wheel differential mechanism 29, etc. The intermediate case portion 37 accommodates the first motor generator 21, the second motor generator 22, a first resolver 41 that detects the rotational speed of the first motor generator 21, and a second resolver 42 that detects the rotational speed of the second motor generator 22. The first resolver 41 detects the rotational speed of the first motor generator 21 and outputs the detection result to a control device (not shown) that controls the drive of the first motor generator 21. The second resolver 42 detects the rotation speed of the second motor generator 22 and outputs the detection result to a control device (not shown) that controls the second motor generator 22.

[0049] More specifically, as shown in Fig. 3, the middle case 37 includes a front wall 37a located at the front end of the middle case 37 and extending in the vertical direction of the vehicle body, a rear wall 37b located at the rear end of the middle case 37 and extending in the vertical direction of the vehicle body, and a front-rear wall 37c located between the front wall 37a and the rear wall 37b and extending in the longitudinal direction of the vehicle body. As shown in Fig. 3, the first resolver 41 is disposed between the front wall 37a and the housing 21c of the first motor-generator 21. As shown in Fig. 3, the first rotor 41a of the first resolver 41 is fitted onto the rotor support portion 21d of the rotary shaft 21a of the first motor-generator 21 and is supported by the rotor support portion 21d so as to be rotatable integrally therewith. The first stator 41b of the first resolver 41 is supported by the front wall 37a. The first rotor 41a is connected to the rotary shaft 21a and is rotated by the rotary shaft 21a, and the first stator 41b is fixed to the front wall portion 37a, so that the rotational speed of the first motor generator 21 can be detected by the first resolver 41.

[0050] The first stator 41b of the first resolver 41 is supported on the front wall portion 37a based on the support structure shown in Figures 3, 4, and 5. That is, as shown in Figures 3 and 4, the front wall portion 37a is provided with a first front support hole 81 through which the rotating shaft 21a of the first motor-generator 21 is inserted, and first support portions 82 are provided at four locations dispersed in the circumferential direction of the first rotor 41a on an inner wall surface 37d of the front wall portion 37a, in areas positioned around the first front support hole 81. As shown in Figures 3 and 5, the first stator 41b is supported by abutting against the receiving portions 82d of the four first support portions 82, and connecting the first stator 41b to three first support portions 82a having screw holes 82b among the four first support portions 82, using first connecting bolts 83. In this embodiment, the first stator 41b is connected to only three first support portions 82 by first connecting bolts 83, but it is possible to connect the first stator 41b to only two first support portions 82 or to all first support portions 82 by first connecting bolts 83.

[0051] As shown in Fig. 3, the second resolver 42 is disposed between the front wall portion 37a and the housing 22c of the second motor-generator 22. As shown in Fig. 3, the second rotor 42a of the second resolver 42 is fitted onto the rotor support portion 22d of the rotating shaft 22a of the second motor-generator 22 and is supported by the rotor support portion 22d so as to be rotatable integrally therewith. The second stator 42b of the second resolver 42 is supported by the front wall portion 37a. The second rotor 42a is connected to the rotating shaft 22a and is rotated by the rotating shaft 22a, and the second stator 42b is fixed to the front wall portion 37a, allowing the second resolver 42 to detect the rotational speed of the second motor-generator 22.

[0052] The second stator 42b of the second resolver 42 is supported on the front wall portion 37a based on the support structure shown in Figures 3, 4, and 5. That is, as shown in Figures 3 and 4, the front wall portion 37a is provided with a second front support hole 85 through which the rotating shaft 22a of the second motor-generator 22 is inserted, and second support portions 86 are provided at four locations dispersed in the circumferential direction of the second rotor 42a on an inner wall surface 37d of the front wall portion 37a, in areas positioned around the second front support hole 85. As shown in Figures 3 and 5, the second stator 42b is supported by abutting against the receiving portions 86d of the four second support portions 86, and then connecting the second stator 42b to three second support portions 86a having threaded holes 86b using second connecting bolts 87. In this embodiment, the second stator 42b is connected to only three second support portions 86 by the second connecting bolts 87, but it is possible to connect only two second support portions 86 or all second support portions 86 by the second connecting bolts 87. The connecting member 19 is inserted through the through hole 88 in the front wall portion 37a shown in Figures 4 and 5.

[0053] As shown in Figures 3 and 5, each first connecting bolt 83 and each second connecting bolt 87 is configured to connect the first stator 41b and the second stator 42b to the first support portion 82a and the second support portion 86a by inserting the first stator 41b and the second stator 42b from the side opposite to the side on which the front wall portion 37a is located in a direction along the axis 21p of the rotating shaft 21a and the axis 22p of the rotating shaft 22a, and engaging them with the first support portion 82a and the second support portion 86a.

[0054] 3, the first support portions 82 and the second support portions 86 protrude from an inner wall surface 37d of the front wall portion 37a toward the first resolver 41 and the second resolver 42. A gap S that allows cooling of the first resolver 41 is formed between the inner wall surface 37d of the front wall portion 37a and the first stator 41b. A gap S that allows cooling of the second resolver 42 is formed between the inner wall surface 37d and the second stator 42b.

[0055] 3, 4, and 5, a first positioning portion 82c is formed on each first support portion 82, and a second positioning portion 86c is formed on each second support portion 86. The first positioning portion 82c is configured to abut against the circumferential portion 41c of the first stator 41b from the outside in the radial direction of the first stator 41b and to position the first stator 41b relative to the first rotor 41a so that the axis of the first stator 41b and the rotational axis of the first rotor 41a coincide with each other. The second positioning portion 86c is configured to abut against the circumferential portion 42c of the second stator 42b from the outside in the radial direction of the second stator 42b and to position the second stator 42b relative to the second rotor 42a so that the axis of the second stator 42b and the rotational axis of the second rotor 42a coincide with each other.

[0056] 2, the peripheral wall 90 of the transmission case 13 includes a rear vertical wall portion 91 that is located at the rear end of the transmission case 13 and extends in the vertical direction of the vehicle body, and a front-to-rear wall portion 92 that is located extending in the front-to-rear direction of the vehicle body between the engine 5 and the rear vertical wall portion 91. As shown in FIGS. 3, 4, and 5, the front-to-rear wall portion 92 includes a bottom wall portion 92a that is located at the bottom of the front-to-rear wall portion 92 and extends in the lateral width direction of the vehicle body, an upper wall portion 92b that is located at the top of the front-to-rear wall portion 92 and extends in the lateral width direction of the vehicle body, and lateral wall portions 92c that are located on the left and right lateral sides of the front-to-rear wall portion 92 and extend in the vertical direction of the vehicle body.

[0057] 5, a first electric wire connector 96 connected to the first resolver 41 via a first electric wire 95 and enabling the extraction of detection information from the first resolver 41, and a second electric wire connector 98 connected to the second resolver 42 via a second electric wire 97 and enabling the extraction of detection information from the second resolver 42, are provided on a front-to-rear wall portion 92 of the peripheral wall 90 of the transmission case 13. The first electric wire connector 96 is provided facing outward to the left, and the second electric wire connector 98 is provided facing outward to the right. 5, the first wire connector 96 is provided in the longitudinal wall 92 at a location where the upper wall 92b and the left lateral wall 92c are connected, and the second wire connector 98 is provided in the longitudinal wall 92 at a location where the upper wall 92b and the right lateral wall 92c are connected. However, the first wire connector 96 may be provided in a middle portion of the upper wall 92b of the longitudinal wall 92 in the width direction of the vehicle body, or in a middle portion of the left and right lateral wall 92c in the up-down direction of the vehicle body. The first wire connector 96 is fitted into a first support hole 96a (see FIG. 4) provided in the middle case 37. The second wire connector 98 is fitted into a second support hole 98a (see FIG. 4) provided in the middle case 37.

[0058] 5 and 6, the first electric wire 95 and the second electric wire 97 are wired along the front wall portion 37a. More specifically, the first electric wire 95 and the second electric wire 97 are wired along the inner wall surface 37d of the front wall portion 37a.

[0059] As shown in FIGS. 5 and 6 , the first electric wire 95 is fixed to a first electric wire fixing portion 101 formed on the front wall portion 37 a, and the second electric wire 97 is fixed to a second electric wire fixing portion 102 formed on the front wall portion 37 a. As shown in FIG. 6 , the second electric wire fixing portion 102 protrudes from the inner wall surface 37 d of the front wall portion 37 a toward the side where the second resolver 42 is located. Although the first electric wire fixing portion 101 is not shown in FIG. 6 , the first electric wire fixing portion 101 also protrudes toward the side where the first resolver 41 is located, similar to the second electric wire fixing portion 102. As shown in FIG. 5 , the first electric wire 95 is fixed to the first electric wire fixing portion 101 by connecting a fastening member 103 attached to the first electric wire 95 to the first electric wire fixing portion 101 with a connecting screw. As shown in FIG. 5, the second electric wire 97 is fixed to the second electric wire fixing portion 102 by connecting a fastening member 103 attached to the second electric wire 97 to the second electric wire fixing portion 102 with a connecting screw.

[0060] [Motor generator support] As shown in FIG. 3, the first motor generator 21 and the second motor generator 22 are supported by a front wall portion 37a and a rear wall portion 37b of the middle case portion 37.

[0061] 3, 4, and 5, a first front support hole 81 is provided in the front wall portion 37a, through which a front portion of the rotating shaft 21a of the first motor-generator 21 is inserted, a bearing 104 is provided that fits around the rotating shaft 21a and is fitted into the first front support hole 81, and the front portion of the rotating shaft 21a is supported by the front wall portion 37a via the bearing 104. As shown in Fig. 3, a first rear support recess 105 is provided in the rear wall portion 37b, into which the rear portion of the rotating shaft 21a fits, and a bearing 106 is provided that fits around the rotating shaft 21a and is fitted into the first rear support recess 105, and the rear portion of the rotating shaft 21a is supported by the rear wall portion 37b via the bearing 106. 4 and 5, a first motor support part 107 is provided in a portion of the front wall part 37a that is located on the opposite side of the first support part 82 from the side on which the rotating shaft 21a is located in the diameter direction of the rotating shaft 21a, and the housing 21c of the first motor generator 21 is supported by the first motor support part 107. The housing 21c is supported by the first motor support part 107 by connecting a connecting part provided on the housing 21c to the first motor support part 107 with a connecting bolt.

[0062] 3, 4, and 5, the front wall portion 37a is provided with a second front support hole 85 through which the front portion of the rotating shaft 22a of the second motor-generator 22 passes, a bearing 108 is provided that fits around the rotating shaft 22a and is fitted into the second front support hole 85, and the front portion of the rotating shaft 22a is supported by the front wall portion 37a via the bearing 108. As shown in Fig. 3, the rear wall portion 37b is provided with a second rear support recess 109 into which the rear portion of the rotating shaft 22a fits, and a bearing 110 is provided that fits around the rotating shaft 22a and is fitted into the second rear support recess 109, and the rear portion of the rotating shaft 22a is supported by the rear wall portion 37b via the bearing 110. 4 and 5, a second motor support part 111 is provided in a portion of the front wall part 37a that is located on the opposite side of the second support part 86 from the side on which the rotating shaft 22a is located in the diameter direction of the rotating shaft 22a, and the housing 22c of the second motor generator 22 is supported by the second motor support part 111. The housing 22c is supported by the second motor support part 111 by connecting a connecting part provided on the housing 22c to the second motor support part 111 with a connecting bolt.

[0063] In this embodiment, the first motor support portion 107 and the second motor support portion 1111 are provided in three locations, but the first motor support portion 107 and the second motor support portion 111 may be provided in two locations or four or more locations. Also, the first motor support portion 107 and the second motor support portion 111 may be a single circular first motor support portion and second motor support portion that extend around the entire circumference of the housing 21c, 22c.

[0064] [Another Example] (1) In the above embodiment, an example is shown in which the first resolver 41 and the second resolver 42 are arranged between the front wall portion 37a and the rear wall portion 37b, but this is not limited thereto, and the resolver may be arranged in front of the front wall portion 37a or behind the rear wall portion 37b.

[0065] (2) In the above-described embodiment, an example was shown in which both the first resolver 41 and the second resolver 42 were disposed between the housing 21c or 22c and the front wall portion 37a, but this is not limiting. One of the first resolver 41 and the second resolver 42 may be disposed between the housing 21c or 22c and the front wall portion 37a, and the other of the first resolver 41 and the second resolver 42 may be disposed between the housing 21c or 22c and the rear wall portion 37b, or both the first resolver 41 and the second resolver 42 may be disposed between the housing 21c or 22c and the rear wall portion 37b.

[0066] (3) In the above embodiment, an example was shown in which the first motor generator 21 and the second motor generator 22 were provided, but only one motor generator or three or more motor generators may be provided.

[0067] (4) In the above embodiment, the first support portions 82 and the second support portions 86 are provided in four locations, but this is not limiting and they may be provided in three or fewer locations or five or more locations. Furthermore, instead of the first support portions 82 in multiple locations, one circular first support portion may be provided around the entire circumference of the first stator 41b, and instead of the second support portions 86 in multiple locations, one circular second support portion may be provided around the entire circumference of the second stator 42b.

[0068] (5) In the above embodiment, the first motor generator 21 and the second motor generator Although an example in which the outer diameters of the first motor generator 21 and the second motor generator 22 are the same has been shown, The outer diameter of the turbine generator 22 may be different.

[0069] (6) In the above embodiment, the first motor generator 21 and the second motor generator 22 are aligned in the width direction of the vehicle body, but this is not limited to this. They may also be aligned in the fore-and-aft direction of the vehicle body, or in an inclined direction that slopes upward to the right or left when viewed in the fore-and-aft direction.

[0070] (7) In the above embodiment, an example was shown in which the first electric wire connector 96 and the second electric wire connector 98 were provided, but an electric wire connector may not be provided.

[0071] (8) In the above embodiment, an example was shown in which the first electric wire 95 and the second electric wire 97 were fixed to the first electric wire fixing portion 101 and the second electric wire fixing portion 102 of the front wall portion 37a while being aligned with the front wall portion 37a, but this is not limited thereto, and the first electric wire 95 and the second electric wire 97 may not be aligned with the front wall portion 37a, or may be fixed to an electric wire fixing portion provided other than the front wall portion 37a. [Industrial Applicability]

[0072] The present invention is applicable to a work vehicle equipped with a transmission that changes the speed of power from an engine and outputs it to a traveling device, and a motor generator connected to the transmission. [Explanation of symbols]

[0073] 1 Front wheels (running gear) 2 Rear wheels (running gear) 5 Engine 13 Mission case 20 Transmission 21 First motor generator (motor generator) 21a Rotation axis 21c Housing 21p shaft core 22 Second motor generator (motor generator) 22a Rotation axis 22c Housing 22p shaft core 37a Front wall (wall) 41 First resolver (resolver) 41a First rotor (rotor) 41b First stator (stator) 42 Second resolver (resolver) 42a Second rotor (rotor) 42b Second stator (stator) 82 1st support part (support part) 83 First connecting bolt (connecting bolt) 86 Second support part (support part) 87 Second connecting bolt (connecting bolt) 90 Peripheral wall 92 Front and rear facing wall 95 First Electric Wire (Electric Wire) 96 First wire connector (wire connector) 97 Second Electric Wire (Electric Wire) 98 Second wire connector (wire connector) 101 1st wire fixing part (wire fixing part) 102 2nd wire fixing part (wire fixing part) 107 First motor support part (motor support part) 111 second motor support portion (motor support portion)

Claims

1. The engine and a transmission that changes the speed of power from the engine and outputs it to a traveling device; a motor generator connected to the transmission; a resolver that detects the rotation speed of the motor generator, a transmission case that houses the transmission is provided with a wall portion through which a rotating shaft of the motor generator is inserted, a rotor of the resolver fitted onto the rotary shaft; a stator of the resolver is supported by the wall portion; the resolver is disposed between the housing and the wall portion in a state in which the resolver and the housing of the motor generator do not overlap in a radial direction of the rotary shaft, a support portion that projects toward the resolver and supports the stator is provided on the wall portion, The wall portion is provided with a motor support portion that projects toward the housing and supports the housing.

2. The work vehicle according to claim 1 , wherein the support portions are provided at a plurality of locations on the wall portion that are dispersed in the circumferential direction of the rotor.

3. 3. The work vehicle according to claim 1, further comprising a connecting bolt that connects the stator to the support portion by inserting the stator in a direction along the axis of the rotating shaft from the side opposite to the side on which the wall portion is located.

4. 2. The work vehicle according to claim 1, wherein the motor support portion is provided at a portion of the wall portion that is located on the opposite side of the support portion from the side on which the rotary shaft is located in the diameter direction of the rotary shaft.

5. 2. The work vehicle according to claim 1, wherein an electric wire connector for extracting the detected information of the resolver is provided on a wall portion of the peripheral wall of the transmission case that faces forward and backward and extends along the longitudinal direction of the vehicle body.

6. 6. The work vehicle according to claim 5, wherein an electric wire connecting the resolver and the electric wire connector is laid along the wall portion.

7. 7. The work vehicle according to claim 6, wherein the wall portion is formed with an electric wire fixing portion for fixing the electric wire.

Images