Motor unit for industrial vehicles

Abstract

The objective is to provide a motor unit for industrial vehicles that can suppress the intrusion of foreign matter into the rotation sensor without increasing the number of parts. [Solution] The rotor shaft 41 has a shaft portion 46 that protrudes from the end bracket 37 toward the output unit portion, and the output unit portion has a motor support connected to the end bracket 37 and forming an insertion space 57 that allows the shaft portion 46 to pass through, and the rotation sensor has a sensor rotor portion provided on the shaft portion that rotates integrally with the rotor shaft 41 and a sensor stator portion provided on the end bracket 37 opposite the sensor rotor portion, and the end bracket 37 has a sensor housing space 80 in which the rotation sensor is housed.

Description

Technical Field

[0001] This invention relates to a motor unit of an industrial vehicle.

Background Art

[0002] As a conventional technology of a motor unit of an industrial vehicle, for example, a cargo handling industrial vehicle disclosed in Patent Document 1 is known. In Patent Document 1, a standing industrial vehicle called a reach-type forklift as a cargo handling industrial vehicle is disclosed. This standing industrial vehicle includes a gear motor in which a speed reducer part and a motor part are eccentrically arranged, the speed reducer part is located below, and the motor part is located above the speed reducer part. The motor part is provided with a rotation speed detection sensor for detecting the rotation of the rotor shaft, and the rotation speed detection sensor is provided at the upper part of the motor part.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the gear motor of the standing industrial vehicle disclosed in Patent Document 1, when it is necessary to suppress the intrusion of foreign matters such as water and dust into the rotation sensor (rotation speed detection sensor) provided at the upper part of the motor part, for example, a seal member, a cover member, etc. for suppressing the intrusion of foreign matters are required. For this reason, there is a problem that the number of parts as a motor unit (gear motor) of an industrial vehicle increases and the manufacturing cost of the motor unit rises. Incidentally, when the rotation sensor is a resolver, waterproof measures for the resolver are necessary.

[0005] This invention has been made in view of the above-mentioned problems, and the object of this invention is to provide a motor unit for an industrial vehicle that can suppress the intrusion of foreign matter into a rotation sensor without increasing the number of parts. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides a motor unit for an industrial vehicle comprising an electric motor section, an output unit section connected to the electric motor section, and a rotation sensor for detecting the rotation angle or rotation speed of the electric motor section, wherein the electric motor section comprises a stator, a rotor disposed within the stator and rotating integrally with the rotor shaft, and an end bracket connected to the stator and supporting the output side of the rotor shaft, wherein the rotor shaft has a shaft section protruding from the end bracket toward the output unit section, the output unit section has a motor support connected to the end bracket and forming an insertion space that allows the shaft section to pass through, and the rotation sensor comprises a sensor rotor section provided on the shaft section and rotating integrally with the rotor shaft, and a sensor stator section provided on the end bracket so as to face the sensor rotor section, and the end bracket has a sensor housing space in which the rotation sensor is housed.

[0007] In this invention, the rotor shaft has a shaft portion that protrudes from the end bracket toward the output unit. The output unit has a motor support connected to the end bracket, which forms an insertion space that allows the shaft portion to pass through. The end bracket is connected to the motor support, and the motor support has an insertion space that allows the shaft portion to pass through. The rotation sensor is housed in a sensor housing space in the end bracket. Because the end bracket is connected to the motor support, the intrusion of foreign matter into the sensor housing space is suppressed. Since the intrusion of foreign matter into the sensor housing space is suppressed by the connection between the end bracket and the motor support, there is no need for separate parts to suppress the intrusion of foreign matter. Therefore, the number of parts in the motor unit does not increase, and manufacturing costs can be suppressed.

[0008] Furthermore, in the motor unit of the industrial vehicle described above, the motor support may have a fitting portion that engages with the end bracket, and the end bracket may have a fitted portion that engages with the fitting portion. In this case, the fitting portion of the motor support engages with the fitted portion of the end bracket, thereby isolating the insertion space from the outside. As a result, the intrusion of foreign objects into the sensor housing space through the insertion space is prevented, further suppressing the intrusion of foreign objects into the sensor housing space.

[0009] Furthermore, in the motor unit of the industrial vehicle described above, the axis of the rotor shaft may be intersected with the horizontal, and the motor support may be located below the end bracket. In this case, since the motor support is located below the end bracket, the sensor housing space where the rotation sensor is housed is below the end bracket, and the insertion space is below the sensor housing space. Therefore, the entry of foreign objects into the sensor housing space through the insertion space is in the direction against gravity, thus further suppressing the entry of foreign objects into the sensor housing space.

[0010] Furthermore, in the motor unit of the industrial vehicle described above, the motor support may have an end face facing the end bracket and a projection that protrudes from the end face toward the end bracket, and the fitting portion may be provided on the projection. In this case, since the mating portion is provided on the protruding portion, for a foreign object to pass from the end face between the mating portion and the mated portion, it must overcome the protruding portion, making it difficult for the foreign object to enter the sensor housing space from between the mating portion and the mated portion.

[0011] Furthermore, the motor unit of the industrial vehicle described above may be configured to have a gasket interposed between the fitting portion and the fitted portion. In this case, a gasket is interposed between the mating portion and the mated portion, so even if foreign matter tries to enter between the mating portion and the mated portion, it will be prevented by the gasket. Therefore, it is possible to prevent foreign matter from entering the sensor housing space.

[0012] Furthermore, the motor unit of the industrial vehicle described above may be configured to include a partition member that separates the insertion space and the sensor housing space. In this case, since the partition member separates the insertion space and the sensor housing space, even if a foreign object enters the insertion space, it will be blocked by the partition member and will be difficult to enter the sensor housing space. As a result, the entry of foreign objects into the sensor housing space can be more reliably suppressed.

[0013] Furthermore, in the motor unit of the industrial vehicle described above, the rotation sensor may be configured as a resolver. In this case, since the rotation sensor is a resolver, the rotation angle of the rotor shaft can be detected by the resolver. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a motor unit for an industrial vehicle that can suppress the intrusion of foreign matter into the rotation sensor without increasing the number of parts. [Brief explanation of the drawing]

[0015] [Figure 1] This is a plan view of a reach-type forklift according to the first embodiment. [Figure 2] This is a side view of a reach-type forklift according to the first embodiment. [Figure 3] This is a perspective view of a reach-type forklift according to the first embodiment. [Figure 4] This is a rear view of the drive unit of a reach-type forklift. [Figure 5] This is a longitudinal cross-sectional view of the main part of the drive unit of a reach forklift. [Figure 6] This is an enlarged cross-sectional view showing a magnified view of the main parts of the drive unit. [Figure 7] It is a bottom view of the resolver. [Figure 8] It is a front view of the main part of the counterbalanced forklift according to the second embodiment. [Figure 9] It is a longitudinal sectional view of the main part of the motor unit according to the second embodiment.

Mode for Carrying Out the Invention

[0016] (First Embodiment) Hereinafter, the motor unit of the industrial vehicle according to the first embodiment will be described with reference to the drawings. The industrial vehicle of this embodiment is a reach forklift (hereinafter simply referred to as "forklift"). Regarding "front and rear", "left and right", and "up and down" for specifying directions, it is shown based on the state where the operator of the forklift is on the standing driver's seat and facing the forward side of the forklift.

[0017] First, the forklift 10 shown in FIG. 1 will be described. The vehicle body 11 of the forklift 10 has a vehicle body main body 12 and a pair of left and right reach legs 13 (13R, 13L) extending forward from the front portion of the vehicle body main body 12. The reach legs 13 are provided with rotatable driven wheels 14 corresponding to the front wheels. The right driven wheel is the driven wheel 14R, and the left driven wheel is the driven wheel 14L. In FIG. 2, only the left reach leg 13 and the left driven wheel 14L are shown. In front of the vehicle body 11 and between both reach legs 13, a cargo handling device 15 is provided. The cargo handling device 15 is supported so as to be able to perform a reach operation in the front-rear direction. The reach operation of the cargo handling device 15 is performed by the operation of a reach cylinder (not shown) provided at the rear portion of the vehicle body main body 12.

[0018] The cargo handling device 15 comprises an outer mast 16 supported by left and right reach legs 13, and an inner mast 17 supported by the outer mast 16 so as to be able to move up and down. A lift support 18 is supported on the inner mast 17 so as to be able to move up and down. A pair of left and right forks 19 are supported on the front of the lift support 18. The upper ends of the forks 19 are pivotally supported on the lift support 18 so as to allow the forks 19 to tilt. Thus, the forks 19 can tilt forward and backward. A lift bracket 20 is provided above the forks 19. A lift cylinder 21 for raising and lowering the inner mast 17 is fixed to the rear of the outer mast 16.

[0019] As shown in Figure 2, a rear wheel 22, which serves as both a drive wheel and a steering wheel, is provided on the left rear of the vehicle body 12. A standing-type driver's seat 23 is provided on the right rear of the vehicle body 11. As shown in Figure 3, a caster wheel 24 is supported below the driver's seat 23 on the vehicle body 12. A steering wheel 25 is provided on the left side of the driver's seat 23 on the vehicle body 12. As shown in Figure 1, a direction lever 26 for switching between forward and reverse, a tilt lever 27, a reach lever 28, and a lift lever 29 are provided in front of the driver's seat 23 on the vehicle body 12.

[0020] As shown in Figure 4, the rear wheels 22 are supported at the bottom of the drive unit 30, which is a motor unit located on the left side of the vehicle body 12. The drive unit 30 includes a driving motor section 31, which is an electric motor section that generates driving force for the rear wheels 22, a gear unit section 32, which is an output unit section, and a steering motor section 33.

[0021] As shown in Figure 5, the travel motor unit 31 includes a stator 34, a rotor 35, and a pair of upper and lower end brackets 36 and 37. The stator 34 includes a cylindrical stator core 38 and stator coils 39. The rotor 35 includes a rotor core 40 disposed within the stator core 38 and a rotor shaft 41 that penetrates the center of the rotor core 40 and is integrated with the rotor core 40. Permanent magnets (not shown) are embedded in the rotor core 40. The travel motor unit 31 is a magnet-embedded synchronous motor.

[0022] The drive motor unit 31 is positioned so that the axis P of the rotor shaft 41 intersects the horizontal direction. In this embodiment, the axis P of the rotor shaft 41 is oriented almost vertically. In other words, the drive unit 30 is vertically oriented. The end bracket 36 is connected to the upper part of the stator 34, and the end bracket 37 is connected to the lower part of the stator 34. The end bracket 36 pivotally supports the area near the upper end of the rotor shaft 41 via a bearing 42, and the end bracket 37 pivotally supports the area near the lower end, which is the output side of the rotor shaft 41, via a bearing 43. Details of the end bracket 37 will be described later.

[0023] As shown in Figure 5, the rotor shaft 41 has a main shaft portion 44 located within the stator core 38, a shaft portion 45 protruding upward from the end bracket 36, and a shaft portion 46 protruding toward the gear unit portion 32 from the end bracket 37. A brake disc 47 is provided on the shaft portion 45. The end bracket 37 is supported by the gear unit portion 32.

[0024] The gear unit 32 includes a support arm 51 that supports the driving motor unit 31, a gear housing 52 provided at the lower part of the support arm 51 that supports the rear wheel 22, and a rotation transmission mechanism 53 housed within the gear housing 52. The support arm 51 corresponds to the motor support. The support arm 51 is formed in a roughly crank shape and supports the driving motor unit 31 by being connected to the end bracket 37. The front part of the support arm 51 is provided with a pivot shaft 54, and the pivot shaft 54 ​​is rotatable relative to the vehicle body 12 (see Figure 2). In other words, the support arm 51 is connected to the vehicle body 12 via the pivot shaft 54.

[0025] As shown in Figure 5, the support arm 51 has an end face 55 facing the end bracket 37. The end face 55 is a substantially horizontal surface. The end face 55 has a projection 56 that protrudes from the end face 55 toward the end bracket 37. The projection 56 is formed in an annular shape so as to be concentric with the axis P on the end face 55. The support arm 51 has an insertion space 57 through which the shaft portion 46 is inserted.

[0026] The gear housing 52, located at the lower part of the support arm 51, has an upper housing body 58 and a lower housing body 59. A cylindrical portion 58A is formed on the upper part of the upper housing body 58. The cylindrical portion 58A is inserted into the insertion space 57 of the support arm 51. The cylindrical portion 58A is rotatably supported relative to the support arm 51 via bearings 61 and 62. Therefore, the gear housing 52 is rotatable relative to the support arm 51.

[0027] The lower part of the upper housing 58 is joined to the lower housing 59. A portion of the shaft portion 46 is inserted through the cylindrical portion 58A, and a gear shaft 63, which is part of the rotation transmission mechanism 53, is inserted coaxially with the rotor shaft 41. The gear shaft 63 is equipped with a gear 64 and is supported by the upper housing 58 and the lower housing 59 via bearings 65 and 66. A shaft coupling 67 connecting the shaft portion 46 and the gear shaft 63 is inserted through the cylindrical portion 58A. The shaft coupling 67 is rotatable relative to the upper housing 58. The gear 64 of the gear shaft 63 meshes with another gear (not shown) of the rotation transmission mechanism 53 housed in the gear housing 52. The rotation transmission mechanism 53 has a plurality of gears, including the gear 64, and the rotation of the rotor shaft 41 is transmitted to the rear wheel 22 by the rotation transmission mechanism 53.

[0028] A gear wheel 68 is provided on the upper part of the gear housing 52. A steering motor unit 33 is provided next to the driving motor unit 31 on the support arm 51 (see Figure 2). The gear wheel 68 is rotated by the steering motor unit 33. The steering motor unit 33 is controlled via a steering shaft (not shown) or the like, which is connected to the steering handle 25 via a steering shaft (not shown). Therefore, the steering motor unit 33 is driven in accordance with the amount of rotation of the steering handle 25, and the rear wheels 22 are steered.

[0029] As shown in Figure 6, the drive unit 30 of this embodiment has a resolver 70 as a rotation sensor for detecting the rotation angle of the rotor shaft 41. As shown in Figure 7, the resolver 70 has a resolver rotor 71, a resolver stator 72, and wiring 73. The resolver rotor 71 corresponds to the sensor rotor part, and the resolver stator 72 corresponds to the sensor stator part.

[0030] The resolver rotor 71 is fixed to the shaft portion 46 of the rotor shaft 41 and rotates integrally with the rotor shaft 41. A nut 74 is screwed onto the shaft portion 46 of the resolver rotor 71 to prevent it from coming loose. The resolver stator 72 is fixed to the end bracket 37 by bolts 75 and surrounds the resolver rotor 71. The resolver stator 72 has a stator core (not shown) and a coil wound around the stator core (not shown). The resolver stator 72 is provided with wiring 73 connected to the coil. The wiring 73 is connected to a controller (not shown) that controls the travel motor section 31. When the resolver rotor 71 rotates, a resolver signal consisting of a two-phase output that detects the rotation of the resolver rotor 71 is transmitted to the controller via the wiring 73.

[0031] The end bracket 37 of this embodiment forms a sensor housing space 80 that communicates with the insertion space 57 of the support arm 51. The end bracket 37 will now be described in detail. As shown in Figure 6, the end bracket 37 has an end wall portion 81, a motor-side peripheral wall portion 82, and a support arm-side peripheral wall portion 83. The end wall portion 81 is a substantially circular wall portion that extends in a direction substantially perpendicular to the axis P of the rotor shaft 41. An axial hole 81A through which the shaft portion 46 is inserted is formed in the center of the end wall portion 81, and a bearing 43 that supports the rotor shaft 41 is provided in the axial hole 81A. The motor-side peripheral wall portion 82 is a substantially cylindrical wall portion that extends from the outer peripheral edge of the end wall portion 81 toward the stator core 38, and the tip of the motor-side peripheral wall portion 82 is joined to the stator core 38.

[0032] The support arm side peripheral wall portion 83 is a substantially cylindrical wall portion that extends from the outer peripheral edge of the end wall portion 81 toward the support arm 51. The sensor housing space 80 is formed by the end wall portion 81 and the support arm side peripheral wall portion 83. A step 84 is formed on the end face of the end wall portion 81 on the sensor housing space 80 side to match the shape of the resolver stator 72. The resolver stator 72 is fixed to the end bracket 37 by bolts 75, but its position can be adjusted to align phase in the circumferential direction.

[0033] The inner wall surface of the support arm side peripheral wall portion 83 is formed such that the maximum inner diameter of the sensor housing space 80 is approximately the same as the insertion space 57 formed by the support arm 51. A projection 86 is formed circumferentially on the end face 85 of the support arm side peripheral wall portion 83 on the support arm 51 side, projecting toward the projection 56 of the support arm 51. The projection 86 of the support arm side peripheral wall portion 83 fits with the projection 56 of the support arm 51 by a spigot joint over the circumferential direction. The projection 56 of the support arm 51 corresponds to the fitting portion, and the projection 86 of the end bracket 37 corresponds to the fitted portion. The projection 86 has a stepped portion 86A that the corner portion 56A of the projection 56 abuts against. The contact of the corner portion 56A with the stepped portion 86A prevents the end bracket 37 from shifting radially relative to the support arm 51.

[0034] In this embodiment, the fitting between the protruding portion 56 of the support arm 51 and the protruding portion 86 of the end bracket 37 is a spigot fitting, which is a clearance fit. Therefore, a liquid gasket 87 is interposed to fill the minute gap between the corner portion 56A and the stepped portion 86A. The liquid gasket 87 is liquid before application and hardens over time after application to form an elastic or viscoelastic film. The liquid gasket 87 is, for example, a silicone-based liquid gasket.

[0035] In this embodiment, a disc-shaped cover 88 is provided on the end bracket 37 as a partition member that separates the sensor housing space 80 and the insertion space 57. The disc-shaped cover 88 has a through hole 89 in its center through which the shaft portion 46 of the rotor shaft 41 is inserted. In this embodiment, a gap is formed between the outer peripheral edge of the disc-shaped cover 88 and the support arm side peripheral wall portion 83, so the disc-shaped cover 88 does not completely separate the sensor housing space 80 and the insertion space 57. The disc-shaped cover 88 is positioned so as not to interfere with the rotating rotor shaft 41 and nut 74. The disc-shaped cover 88 has the function of preventing foreign matter from entering the sensor housing space 80 from the insertion space 57. The disc-shaped cover 88 is formed of a cold-rolled material, but is not particularly limited as long as it is a heat-resistant material.

[0036] Next, the operation of the drive unit 30 according to this embodiment will be described. The forklift 10 is driven by the operation of the direction lever 26 by an operator seated in the driver's seat 23. The drive motor unit 31 is driven according to the amount of operation of the direction lever 26. The rotational force of the rotor shaft 41 driven by the drive motor unit 31 is transmitted to the rear wheels 22 via the rotation transmission mechanism 53. The steering motor unit 33 is driven according to the amount of operation of the steering handle 25 by the operator, causing the gear housing 52 to pivot relative to the support arm 51, and steering the rear wheels 22 of the forklift 10.

[0037] By the way, the rotation angle of the rotor shaft 41 is transmitted to the controller via wiring 73 by a resolver signal consisting of a two-phase output that detects the rotation from the resolver 70. The protrusion 86 of the end bracket 37 and the protrusion 56 of the support arm 51 are fitted together. For example, water as foreign matter may enter the end face 55 of the support arm 51, but since the protrusion 56 protrudes upward from the end face 55, there is almost no risk of it reaching the fitting surface between the protrusion 86 and the protrusion 56. Even if water were to reach the fitting surface between the protrusion 86 and the protrusion 56, the liquid gasket 87 would prevent it from entering the insertion space 57. In the unlikely event that water enters the insertion space 57 from the fitting surface between the protrusion 86 and the protrusion 56, the water will move downward due to gravity, so there is almost no risk of the water entering the sensor housing space 80. Therefore, water adhesion to the resolver 70 is prevented.

[0038] On the other hand, while the forklift 10 is in motion, the drive of the travel motor unit 31 may cause fine particles of lubricating oil or minute wear particles to be generated as foreign matter from the sliding parts of the rotation transmission mechanism 53. Even if this type of foreign matter is generated and floats in the insertion space 57, the disc-shaped cover 88 prevents the foreign matter from entering the sensor housing space 80, thus preventing the foreign matter from adhering to the resolver 70.

[0039] The drive unit 30 according to this embodiment provides the following effects. (1) The rotor shaft 41 has a shaft portion 46 that protrudes from the end bracket 37 toward the output unit. The output unit has a support arm 51 as a motor support that is connected to the end bracket 37 and forms an insertion space 57 that allows the shaft portion 46 to pass through. The end bracket 37 is connected to the support arm 51, and the support arm 51 has an insertion space 57 that allows the shaft portion 46 to pass through. The resolver 70 is housed in a sensor housing space 80 of the end bracket 37. The connection of the end bracket 37 to the support arm 51 prevents foreign matter from entering the sensor housing space 80. Since the connection between the end bracket 37 and the support arm 51 prevents foreign matter from entering the sensor housing space 80, no additional parts are required to prevent foreign matter from entering. Therefore, the number of parts in the motor unit does not increase, and the manufacturing cost of the motor unit can be reduced.

[0040] (2) The support arm 51 has a fitting portion that engages with the end bracket 37, and the end bracket 37 has a fitted portion that engages with the fitting portion by a spigot. As a result, the fitting portion of the support arm 51 engages with the fitted portion of the end bracket 37, thereby isolating the insertion space 57 from the outside. As a result, the entry of foreign objects into the sensor housing space 80 through the insertion space 57 is prevented, and the entry of foreign objects into the sensor housing space 80 can be further suppressed.

[0041] (3) The axis P of the rotor shaft 41 intersects the horizontal, and the support arm 51 is positioned below the end bracket 37. Since the support arm 51 is positioned below the end bracket 37, the sensor housing space 80 in which the resolver 70 is housed is below the end bracket 37, and the insertion space 57 is below the sensor housing space 80. Therefore, the entry of foreign matter into the sensor housing space 80 through the insertion space 57 is in the direction of gravity, thus further suppressing the entry of foreign matter into the sensor housing space 80.

[0042] (4) The support arm 51 has an end face 55 facing the end bracket 37 and a projection 56 that protrudes from the end face 55 toward the end bracket 37, and the fitting portion is provided on the projection 56. For foreign matter to pass from the end face 55 between the fitting portion and the fitted portion, it is necessary to go over the projection 56, and it is difficult for foreign matter to enter the sensor housing space 80 from between the fitting portion and the fitted portion.

[0043] (5) Since a liquid gasket 87 is interposed between the mating portion and the mated portion, any foreign matter that tries to enter between the mating portion and the mated portion will be prevented by the liquid gasket 87. As a result, the entry of foreign matter into the sensor housing space 80 is prevented.

[0044] (6) Since the disc-shaped cover 88 separates the insertion space 57 from the sensor housing space 80, even if foreign matter enters the insertion space 57, it is difficult for it to enter the sensor housing space 80 because it is blocked by the disc-shaped cover 88. As a result, the entry of foreign matter into the sensor housing space 80 can be suppressed more reliably.

[0045] (7) Since the rotation sensor is a resolver 70, the rotation angle of the rotor shaft 41 can be detected by the resolver 70.

[0046] (8) In conventional forklifts, the resolver is positioned between the disc brake, which is located near the upper end of the rotor shaft, and the upper end bracket. To prevent foreign matter from entering the resolver from the rotor shaft, it was necessary to interpose a sealing member between the rotor shaft and the end bracket. In addition, to prevent foreign matter from entering from the disc brake side, it was necessary to provide a cover member between the resolver and the disc brake. However, in the drive unit 30 of this embodiment, these sealing members and cover members are unnecessary, and the number of parts required to prevent foreign matter from entering the resolver 70 can be reduced.

[0047] (Second embodiment) Next, a motor unit of an industrial vehicle according to the second embodiment will be described. This embodiment differs from the first embodiment in that the motor unit is mounted horizontally. In this embodiment, the same configuration as in the first embodiment will be referred to in the description of the first embodiment, and the same reference numerals will be used.

[0048] As shown in Figure 8, the forklift 90 as an industrial vehicle is a counterweight type forklift. The front of the forklift 90's body 91 is equipped with a front axle 92. The front axle 92 is equipped with a pair of left and right front wheels 93 as drive wheels. The front axle 92 is equipped with a pair of left and right motor units 94. Each motor unit 94 has a drive motor section 31 as an electric motor section and an output unit section 95. Because the drive motor section 31 is mounted transversely, the axis P of the rotor shaft 41 is approximately horizontal. The rotation of the rotor shaft 41 is transmitted to the front wheels 93 via the output unit section 95.

[0049] The output unit 95 has a motor support 96 connected to the end bracket 37, which forms an insertion space 97 that allows the shaft 46 to be inserted. As shown in Figure 9, the end bracket 37 has a sensor housing space 80 in which the resolver 70 is housed. The motor support 96 has a fitting portion 98 that fits with a protruding portion 86 of the end bracket 37 by a spigot. The fitting portion 98 of the motor support 96 and the protruding portion 86 of the end bracket 37, which is the fitted portion, separate the insertion space 97 from the outside. A liquid gasket 99 is interposed between the protruding portion 86 and the fitting portion 98. In addition, a disc-shaped cover 88 is provided on the end bracket 37 as a partition member that separates the sensor housing space 80 from the insertion space 97.

[0050] The motor unit 94 according to this embodiment provides the same effect as the effect (1) of the first embodiment. Furthermore, even if the motor unit 94 is placed horizontally, the liquid gasket 99 can prevent foreign matter from entering the sensor housing space 80 from the outside of the motor unit 94.

[0051] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the invention. For example, the following modifications may be made.

[0052] ○ In the above embodiment, the motor support has an end face facing the end bracket and a projection that protrudes from the end face toward the end bracket, but is not limited to this. For example, a motor support may have no projection. ○ In the above embodiment, a liquid gasket was interposed between the mating portion and the mated portion, but this is not limited to this. For example, a metal gasket may be interposed instead of a liquid gasket. Also, if the motor unit is mounted vertically and the motor support has a protruding portion, a gasket may not be required. ○ In the above embodiment, the motor unit has a partition member that separates the insertion space and the sensor housing space, but it is not limited to this. For example, a motor unit without a partition member may also be used. The shape of the partition member is not limited to the above embodiment, and any shape that can prevent foreign matter from entering the sensor housing space from the insertion space is acceptable. ○ In the above embodiment, a resolver was used as an example of a rotation sensor, but it is not limited to this. The rotation sensor may be, for example, a relative position sensor or a TMR sensor capable of outputting a z pulse in addition to a two-phase pulse train signal (a pulse, b pulse). The rotation sensor may also be a sensor that detects the rotational speed of the electric motor section, for example, the rotational speed of the electric motor section may be detected as the number of rotations per unit time (1 minute) of the rotor shaft (rpm). ○ In the above embodiment, a forklift was used as an example of an industrial vehicle, but it is not limited to this. The industrial vehicle can be any industrial vehicle that can be driven by an electric motor, such as a towing vehicle, a towing tractor, or an automated guided vehicle. [Explanation of Symbols]

[0053] 10 Reach forklifts 11, 91 car bodies 12. Body 15. Cargo handling equipment 19 Forks 21 Lift Cylinder 22 Rear wheels 23 Driver's seat 25 Steering wheel 26 Direction lever 30 Drive Units 31. Motor section for driving 32 Gear unit section (output unit section) 33 Steering motor section 34 stata 35 rotors 36 End Bracket 41 Rotor shaft 45, 46 Shaft section 47 Brake Disc 51 Support Arm 52 Gear Housing 53 Rotational transmission mechanism 55 End face 56 Projection part (fitting part) 57, 97 Insertion space 70 resolvers 80 Sensor housing space 86 Projection part (mated part) 87, 99 Liquid gasket 88. Disc-shaped cover 90 Counterbalanced forklift 94 Motor Unit 95 Output Unit Section 96 Motor support 98 Fitting part P axis center

Claims

1. The electric motor section, The output unit connected to the aforementioned electric motor unit, It includes a rotation sensor that detects the rotation angle or rotation speed of the electric motor section, The aforementioned electric motor section is stator and, A rotor is positioned within the stator and rotates integrally with the rotor shaft, In a motor unit for an industrial vehicle, which has an end bracket connected to the stator and supporting the output side of the rotor shaft, The rotor shaft has a shaft portion that protrudes from the end bracket toward the output unit portion, The output unit section is, It has a motor support that is connected to the end bracket and forms an insertion space that allows the shaft portion to be inserted, The aforementioned rotation sensor is A sensor rotor portion is provided on the shaft portion and rotates integrally with the rotor shaft, It has a sensor stator portion provided on the end bracket so as to face the sensor rotor portion, The motor unit for an industrial vehicle is characterized in that the end bracket has a sensor housing space in which the rotation sensor is housed.

2. The motor support has a fitting portion that fits with the end bracket, The motor unit for an industrial vehicle according to claim 1, characterized in that the end bracket has a fitted portion that is fitted with the fitting portion.

3. The motor unit for an industrial vehicle according to claim 2, characterized in that the axis of the rotor shaft intersects with respect to the horizontal, and the motor support is located below the end bracket.

4. The motor support is The end face facing the end bracket, It has a projection that protrudes from the end face toward the end bracket side, The motor unit for an industrial vehicle according to claim 3, characterized in that the fitting portion is provided on the protruding portion.

5. The motor unit for an industrial vehicle according to claim 2 or 3, characterized in that it has a gasket interposed between the fitting portion and the fitted portion.

6. The motor unit for an industrial vehicle according to claim 1 or 2, characterized in that it has a partition member that separates the insertion space and the sensor housing space.

7. The motor unit for an industrial vehicle according to claim 1 or 2, characterized in that the rotation sensor is a resolver.

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