JP5858448B1 - Lifting device and cargo handling vehicle - Google Patents

Abstract

An elevating apparatus and a cargo handling vehicle capable of raising and lowering an elevating body without using a hydraulic system and reducing the size thereof are provided. An elevating device includes a mast extending in an up-down direction, an elevating body that can be raised and lowered relative to the mast, an electric motor that generates power for raising and lowering the elevating body, and rotating by the power of the electric motor. A drive shaft 50 and a chain 47 to which the power of the electric motor 43 is transmitted via the drive shaft 50 are provided, and when the chain 47 is driven, the lifting body moves up and down. The drive shaft 50 has a right end portion 50R and a left end portion 50L that extend in the left-right direction Y and is provided with a sprocket 44 on which the chain 47 is hung. The drive shaft 50 includes a right end portion 50R and a left end portion 50L. An input unit 51 that is disposed and to which power of the electric motor 43 is input is provided, and bearing devices 61 and 62 that rotatably support the drive shaft 50 are provided in the input unit 51, the right end 50R, and the left end 50L. ing. [Selection] Figure 4

Description

  The present invention relates to a lifting device and a cargo handling vehicle that lift and lower a lifting body without using a hydraulic system.

  In general, a lifting device provided in a cargo handling vehicle such as a forklift is composed of a hydraulic system including a hydraulic cylinder and an oil pump. Under these circumstances, with the improvement of the output of the electric motor, a cargo handling vehicle that does not use the hydraulic system has been developed. The following Patent Document 1 describes a cargo handling device applied to a cargo handling vehicle such as a forklift, and the cargo handling device includes a chain / sprocket mechanism including a chain and a sprocket instead of a hydraulic system. .

  However, in Patent Document 1, by providing an electric motor behind the sprocket that drives the chain, the drive shaft that is rotated by the power of the electric motor extends in the front-rear direction, so that the dimensions of the lifting device increase in the front-rear direction. There's a problem. Further, Patent Document 1 does not describe a specific configuration for supporting the drive shaft.

JP-A-7-285798

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a lifting device and a cargo handling vehicle that can lift and lower a lifting body without using a hydraulic system and can be downsized. To do.

To solve the above problems, the lifting device of the present invention described in claim 1 includes a pair of masts which are spaced from each other in the horizontal direction extends in the vertical direction, vertically movable relative to said pair of masts A lifting and lowering body provided on the motor, a motor that generates power for the lifting and lowering body to move up and down, a single drive shaft that is rotated by the power of the motor, and the power of the motor is transmitted through the drive shaft. A lifting device in which the lifting body is moved up and down by driving the chain, wherein the electric motor is disposed between the pair of masts and behind the mast, and the drive shaft is , provided at a said electric motor and spacing as the rotational axis do not match the rotor the axis of rotation of the drive shaft electric motor has, the single drive shaft, extending in the lateral direction Rutotomoni, the chain has a right end portion and left end portion of the sprocket is provided exerted, the lifting device may further together is provided between the right end portion and the left end portion of the one of the drive shaft, an input unit for transmitting the rotation of the drive shaft rotational power of the electric motor, wherein the input unit is provided in an each of the right end portion and the left end portion, and a bearing device for rotatably supporting the drive shaft It is characterized by providing .

  The lifting device according to claim 2 is the lifting device according to claim 1, wherein the input unit includes a gear portion formed with external teeth connected to the electric motor, and a right end of the gear portion. A first small-diameter portion having an outer diameter smaller than that of the gear portion, and a second small-diameter portion continuing to the left end of the gear portion and having an outer diameter smaller than that of the gear portion. The bearing device provided in the section includes a first rolling bearing that supports the first small diameter portion and a second rolling bearing that supports the second small diameter portion.

  The lifting device according to claim 3 is the lifting device according to claim 1 or 2, wherein the bearing device provided in the input unit is attached to an inside of a housing that covers the input unit, and the right end The bearing device provided at the left end portion and the lower portion is attached to a lower frame connected to a lower end portion of the mast, and the housing is fixed to the lower frame.

  The lifting device according to claim 4 is the lifting device according to claim 3, wherein the housing is fixed to the lower frame via a link, and the link is fixed to the lower frame. When not in a state, the position of the housing relative to the lower frame can be adjusted.

  In addition, a cargo handling vehicle according to a fifth aspect includes the lifting device according to any one of the first to fourth aspects, and a vehicle body that moves together with the lifting device.

  ADVANTAGE OF THE INVENTION According to this invention, the raising / lowering body can be raised / lowered without using a hydraulic system, and the raising / lowering apparatus and cargo handling vehicle which can achieve size reduction can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which simplifies and shows the cargo handling vehicle provided with the raising / lowering apparatus which concerns on one Embodiment of this invention, Comprising: It is a side view of the said cargo handling vehicle. It is a figure which shows the raising / lowering apparatus which concerns on the same embodiment, Comprising: It is a schematic diagram which shows the state which the raising / lowering body fell. It is a figure which shows the raising / lowering apparatus which concerns on the same embodiment, Comprising: It is a schematic diagram which shows the state which the raising / lowering body raised. It is a figure which shows the raising / lowering apparatus which concerns on the same embodiment, Comprising: It is a partial cross section rear view which shows an electric motor and a drive shaft. (A) is a partial cross-sectional rear view showing the support structure of the electric motor according to the embodiment, and (B) is a side view of the electric motor showing the support structure. It is a figure which shows the raising / lowering apparatus which concerns on a comparative example, Comprising: It is a partial cross section rear view which shows an electric motor and a drive shaft.

  An embodiment of a lifting device according to the present invention will be described with reference to the drawings. In the drawings, a front-rear direction X indicated by an arrow X, a left-right direction Y indicated by an arrow Y, and a vertical direction Z indicated by an arrow Z are directions orthogonal to each other.

As shown in FIG. 1, the reach-type forklift 1 is a cargo handling vehicle including a vehicle main body 10, a traveling device 20, a cargo handling device 30, and the like.
The vehicle main body 10 includes a battery storage portion 11 that stores a battery (not shown) that is a power source of the traveling device 20 and the cargo handling device 30, and a riding portion 12 on which an operator (not shown) that operates the forklift 1 rides. Is provided. Also. The vehicle body 10 is provided with a straddle leg 13 projecting forward and a head guard 14 disposed above the riding portion 12. The straddle legs 13 are provided on the right side and the left side of the cargo handling device 30.

  The traveling device 20 includes a front wheel 21 provided on the straddle leg 13, a rear wheel 22 provided rearward of the front wheel 21, a traveling motor (not shown) for driving the rear wheel 22, It is comprised by the steering apparatus (illustration omitted) etc. which change direction. As the traveling device 20 travels on the road surface, the vehicle body 10 moves together with the cargo handling device 30.

  The cargo handling device 30 is provided in front of the vehicle body 10 and supports a fork 31 that supports a pallet (not shown) on which a load is loaded, a lifting device 40 that lifts and lowers the fork 31, a tilt device (not shown), and a reach. A device (not shown). The lifting device 40 includes a mast 41, a carriage 42, and the like. A detailed configuration of the lifting device 40 will be described later with reference to FIG. The tilt device adjusts the tilt angle, which is the angle of the fork 31 with respect to the horizontal plane, by tilting the carriage 42. The reach device moves the fork 31 together with the lifting device 40 in the front-rear direction X. FIG. 1 shows the forklift 1 when the reach device moves the lifting device 40 and the fork 31 forward.

  The structure which concerns on the raising / lowering apparatus 40 is demonstrated with reference to FIGS. 2 and 3, the carriage 42 is illustrated in a state separated from the mast 41 in order to clearly illustrate the objects that overlap each other when viewed from the right, and the outer mast 41A and the inner mast 41 constituting the mast 41 are illustrated. The mast 41B is shown separated from each other.

  As shown in FIG. 2, the elevating device 40 includes a mast 41 extending in the up-down direction Z, a carriage 42 that can be raised and lowered with respect to the mast 41, and an electric motor 43 that generates power for raising and lowering the carriage 42. , Sprockets 44 to 46 and chains 47 and 48 are provided. The sprockets 44 to 46 and the chains 47 and 48 constitute a chain / sprocket mechanism that transmits the power generated by the electric motor 43 to the carriage 42.

  The lifting device 40 includes the two chain / sprocket mechanisms provided at an interval in the left-right direction Y (see FIG. 4). Since the chain / sprocket mechanism arranged on one of the right side and the left side and the chain / sprocket mechanism arranged on the other side have the same configuration, in the following, the chain / sprocket mechanism arranged on the right side The configuration related to the sprocket mechanism will be described, and the description of the configuration related to the chain / sprocket mechanism arranged on the left side will be omitted.

  The mast 41 is a two-stage mast that expands and contracts in the vertical direction Z, and includes an outer mast 41A that is a fixed mast and an inner mast 41B that is a moving mast. The outer mast 41A is provided at intervals in the left-right direction Y (see FIG. 4), and the inner mast 41B is provided between the two outer masts 41A. The inner mast 41 </ b> B is a lifting body that is lifted and lowered with respect to the outer mast 41 </ b> A and that moves up and down by the power of the electric motor 43.

  The carriage 42 is provided between two inner masts 41 </ b> B provided at intervals in the left-right direction Y. The carriage 42 includes a lift bracket 42A provided to be movable up and down with respect to the inner mast 41B, and a finger bar (not shown) to which the fork 31 is fixed. The carriage 42 is a lifting body that moves up and down by the power of the electric motor 43.

  The electric motor 43 includes a rotor (not shown) that is rotatably provided, and a stator (not shown) that generates a magnetic field for rotating the rotor. The electric motor 43 generates power for raising and lowering the lifting body by rotating the rotor. The power of the electric motor 43 is transmitted to the sprocket 44. A detailed configuration for transmitting power from the electric motor 43 to the sprocket 44 will be described later with reference to FIG.

  The sprocket 44 is provided in the vicinity of the lower end portion of the outer mast 41A, and the sprocket 45 is provided in the vicinity of the upper end portion of the outer mast 41A. A chain 47 is hung on the sprockets 44 and 45. The sprocket 46 is provided in the vicinity of the upper end portion of the inner mast 41B and moves up and down together with the inner mast 41B. A chain 48 is hung on the sprocket 46.

  The chain 47 has one end 47A and the other end 47B connected to the inner mast 41B. The chain 47 is spanned between the sprockets 44, 45, one end 47 </ b> A is lifted above the sprocket 44, and the other end 47 </ b> B hangs below the sprocket 45. One end 47A and the other end 47B of the chain 47 are close to each other in the inner mast 41B. The chain 47 lifts the inner mast 41B. The chain 48 has one end 48A connected to the outer mast 41A and the other end 48B connected to the carriage 42. One end 48 </ b> A and the other end 48 </ b> B of the chain 48 hang down below the sprocket 46. The chain 48 lifts the carriage 42.

  With reference to FIG. 2 and FIG. 3, the operation | movement which concerns on raising / lowering of a raising / lowering body is demonstrated. FIG. 2 shows a state in which the fork 31 is lowered to the lowest position, and FIG. 3 shows a state in which the fork 31 is raised to the highest position. When the fork 31 shown in FIG. 2 is raised, the electric motor 43 rotates the sprocket 44 so that the length of the chain 47 from the sprocket 45 to the other end 47B is shortened. By shortening the length of the chain 47 from the sprocket 45 to the other end 47B, the inner mast 41B rises with respect to the outer mast 41A, and the length of the chain 48 from the sprocket 46 to the one end 48A increases. . The length of the chain 48 from the sprocket 46 to the one end 48A is increased, so that the length of the chain 48 from the sprocket 46 to the other end 48B is shortened, and the carriage 42 is raised with respect to the inner mast 41B. To do. In this way, the fork 31 provided on the carriage 42 is raised to the position shown in FIG. When the fork 31 shown in FIG. 3 is lowered, the electric motor 43 rotates the sprocket 44 so that the length of the chain 47 from the sprocket 45 to the other end 47B becomes longer. As described above, when the chain 47 is driven, the inner mast 41 </ b> B, the carriage 42, and the fork 31, which are lifting bodies, are lifted and lowered.

  A configuration for transmitting power from the electric motor 43 to the sprocket 44 will be described with reference to FIG. FIG. 4 is a view showing the vicinity of the lower end portion of the outer mast 41A, and is a view of the lifting device 40 as seen from the rear.

  As shown in FIG. 4, the lifting device 40 includes a speed reducer 49 and a drive shaft 50. The reduction gear 49 is connected to the electric motor 43, and the power of the electric motor 43 is transmitted to the drive shaft 50 via the reduction gear 49. Similar to the electric motor 43, the speed reducer 49 is disposed above the drive shaft 50 and is provided between the pair of left and right chains 47. The speed reducer 49 has an output gear 49A that outputs the power of the electric motor 43, and reduces the rotational speed of the rotor of the electric motor 43 for output.

  The drive shaft 50 is rotated by the power of the electric motor 43. The drive shaft 50 extends in the left-right direction Y and has a right end portion 50R and a left end portion 50L provided with a sprocket 44. Further, the drive shaft 50 is provided with an input portion 51 that is disposed between the right end portion 50R and the left end portion 50L and into which the power of the electric motor 43 is input. The input unit 51 is configured by a cylindrical member provided on the outer periphery of the drive shaft 50. The input part 51 includes a gear part 51A in which external teeth connected to the electric motor 43 are formed, a first small diameter part 51B that is continuous with the right end of the gear part 51A and has an outer diameter smaller than that of the gear part 51A, The second small-diameter portion 51C is continuous with the left end of the gear portion 51A and has an outer diameter smaller than that of the gear portion 51A.

  The gear portion 51 </ b> A meshes with the output gear 49 </ b> A of the speed reducer 49, and the input portion 51 is rotated by the power of the electric motor 43. The rotation of the input unit 51 is transmitted to the drive shaft 50 through a key 52 fitted in a key groove (not shown) formed on the inner periphery of the input unit 51 and the outer periphery of the drive shaft 50. The rotation of the drive shaft 50 is transmitted to the sprocket 44 through a key 53 fitted in a key groove (not shown) formed on the outer periphery of the drive shaft 50 and the inner periphery of the sprocket 44. In this way, the power of the electric motor 43 is transmitted to the sprocket 44 and the chain 47 via the drive shaft 50.

With reference to FIG. 4, the structure which concerns on the support structure of the drive shaft 50 is demonstrated.
A bearing device 61 and a pair of left and right bearing devices 62 are provided at the input portion 51, the right end portion 50R, and the left end portion 50L of the drive shaft 50, and each of the bearing devices 61 and 62 can rotate the drive shaft 50. I support it.

  The bearing device 61 provided in the input unit 51 is attached inside a housing 71 that covers the input unit 51. The bearing device 61 includes a first rolling bearing 61A that supports the first small diameter portion 51B of the input portion 51, and a second rolling bearing 61B that supports the second small diameter portion 51C of the input portion 51. The outer ring of each rolling bearing 61 </ b> A, 61 </ b> B is fixed to the housing 71, and the inner ring of each rolling bearing 61 </ b> A, 61 </ b> B is fixed to the input unit 51. The housing 71 also serves as the housing of the speed reducer 49, and a seal member 72 that prevents foreign matter from entering the housing 71 is provided between the housing 71 and the input portion 51 of the drive shaft 50.

  The bearing devices 62 provided at the right end portion 50R and the left end portion 50L are attached to a lower frame 81 connected to the lower end portion of the mast 41. Each bearing device 62 includes a rolling bearing 62A that supports the drive shaft 50, and a cover 62B that covers the rolling bearing 62A. The outer ring of the rolling bearing 62A is fixed to the cover 62B, and the inner ring of the rolling bearing 62A is fixed to the drive shaft 50. The lower frame 81 connects the pair of left and right outer masts 41 </ b> A to each other, and has a right flange portion 82 </ b> R and a left flange portion 82 </ b> L in which a through hole 83 through which the drive shaft 50 passes is formed. The bearing device 62 provided at the right end portion 50R is attached to the right flange portion 82R, and the bearing device 62 provided at the left end portion 50L is attached to the left flange portion 82L.

  With reference to FIG. 5, the structure which concerns on the fixing structure of the electric motor 43 is demonstrated. FIG. 5A is a view of the electric motor 43, the housing 71, and the like viewed from the rear, and is a view showing a part of the housing 71 and the like in cross section. FIG. 5B is a diagram showing a simplified view of the housing 71 viewed from the right side, in which the sprocket 44, the chain 47, the bearing device 62, the right flange portion 82R, and the like are not shown. .

  The electric motor 43 is connected to a housing 71 that covers the speed reducer 49 and the input unit 51, and the electric motor 43 is fixed to the outer mast 41 </ b> A by fixing the housing 71 to the lower frame 81.

  As shown in FIG. 5A, the housing 71 is fixed to the lower frame 81 via a link 91. The link 91 has one end 91A constituting the lower end and the other end 91B constituting the upper end. A support shaft 92 that rotatably supports the link 91 is inserted into the one end 91A, and a bolt 93 that is screwed into the housing 71 is inserted into the other end 91B. The support shaft 92 is inserted into a pair of left and right flange portions 84 formed on the lower frame 81, and one end portion 91 </ b> A of the link 91 is sandwiched between the flange portions 84. In a state where the link 91 is not fixed to the lower frame 81, the other end 91B of the link 91 rotates around the one end 91A. As shown in FIG. 5B, one end 91 </ b> A of the link 91 is fixed to the lower frame 81 by screwing a bolt 94 that fixes the support shaft 92 into the flange portion 84. Further, the other end 91 </ b> B of the link 91 is fixed to the housing 71 by a bolt 93 inserted into the link 91 being screwed into the housing 71.

With reference to FIG. 6, the structure of the raising / lowering apparatus 140 which concerns on a comparative example is demonstrated. The description of the same configuration as that of the above embodiment is omitted.
The lifting device 140 of the comparative example includes a drive shaft 150. The drive shaft 150 has a right end 150R and a left end 150L where the sprocket 44 is provided. Further, the drive shaft 150 is provided with an input portion 151 into which the power of the electric motor 43 is input. The input portion 151 includes a gear portion 151A in which external teeth connected to the electric motor 43 are formed, a first small diameter portion 151B continuous to the right end of the gear portion 151A, and a second small diameter continuous to the left end of the gear portion 151A. Part 51C. A bearing device 161 is provided in the input portion 151 of the drive shaft 150, and the bearing device 161 supports the drive shaft 150 in a rotatable manner. The bearing device 161 is attached to the inside of the housing 171 that covers the input unit 151. The bearing device 161 includes a first rolling bearing 161A that supports the first small-diameter portion 151B, and a second rolling bearing 161B that supports the second small-diameter portion 151C. By fixing the housing 171 to the lower frame 181 connected to the lower end of the outer mast 41A, the electric motor 43 is fixed to the outer mast 41A. The lower frame 181 is formed with a through-hole 183 through which the drive shaft 150 is passed, and a pair of left and right flange portions 182R and 182L are formed. The housing 171 is provided between the flange portions 182R and 182L, and is fixed to the lower frame 181 by screwing bolts 191 inserted into the flange portions 182R and 182L into the housing 171.

  In the comparative example, the drive shaft 150 is supported by the bearing device 161 provided in the input portion 151, and no bearing device is provided in the right end portion 150R and the left end portion 150L. Therefore, when the carriage 42 receives a load, the chain 47 is pulled by the inner mast 41B, so that an upward force acts on the sprocket 44. In this way, an upward force acts on the sprocket 44 provided at the right end portion 150R and the left end portion 150L of the drive shaft 150, so that a force generated to transmit torque to the drive shaft 150 is generated on the drive shaft 150. In addition, a large bending force input from the sprocket 44 acts. For this reason, in order to ensure the rigidity of the drive shaft 150, it is necessary to increase the outer diameter of the drive shaft 150 from the right end portion 150R and the left end portion 150L toward the input portion 151. Further, it is necessary to use a large bearing device 161 having a large load capacity, and it is also necessary to increase the size of the housing 171 in order to ensure rigidity. For this reason, the electric motor 43 and the speed reducer 49 of the elevating device 140 are arranged at a higher position than the electric motor 43 and the speed reducer 49 of the elevating device 40.

In the present embodiment, the following effects can be obtained.
(1) The sprocket 44 is provided at the right end portion 50R and the left end portion 50L of the drive shaft 50, and the power of the electric motor 43 is input to the input portion 51 disposed between the right end portion 50R and the left end portion 50L of the drive shaft 50. The For this reason, the power of the electric motor 43 can be transmitted to the chain 47 through the drive shaft 50 extending in the left-right direction Y. Therefore, it is possible to configure the lifting device 40 having a smaller dimension in the front-rear direction X compared to a configuration in which the drive shaft extends in the front-rear direction X (that is, the configuration of Patent Document 1). Further, since the bearing device 62 is provided at the right end portion 50R and the left end portion 50L of the drive shaft 50, the bending force acting on the drive shaft 50 is alleviated, and the bearing device 61 transmits torque to the drive shaft 50. It is only necessary to be configured so as to receive only the force generated in the drive shaft 50, and the diameter of the drive shaft 50 can be reduced as compared with the configuration in which the bearing device 61 is provided only in the input portion 51 of the drive shaft 50 (the configuration of the comparative example). Can be planned. By reducing the diameter of the drive shaft 50, it is possible to dispose the electric motor 43 and the speed reducer 49 at a low position, or to increase the diameter of the input unit 51 without providing the electric motor 43 at a high position.

  (2) The bearing device 61 includes a first rolling bearing 61A and a second rolling bearing 61B. Accordingly, the gear portion 51A can be sandwiched between the first rolling bearing 61A and the second rolling bearing 61B, and the input portion 51 is stably supported as compared with the configuration in which the input portion 51 is supported by one rolling bearing. be able to.

  (3) Since the bearing device 61 is attached to the inside of the housing 71 that covers the input unit 51, the bearing device 61 and the housing 71 can be handled as a unit when the lifting device 40 is assembled. Further, since the bearing device 62 is attached to the lower frame 81 connected to the lower end portion of the outer mast 41A, and the housing 71 is fixed to the lower frame 81, the bearing devices 61 and 62 and the drive shaft 50 are connected. It can be moved together with the mast 41.

  (4) In a state where the link 91 is not fixed to the lower frame 81, the position of the housing 71 with respect to the lower frame 81 can be adjusted. For this reason, the center line of the bearing device 61 and the center line of the bearing device 62 can be matched when the lifting device 40 is assembled.

  (5) By reducing the diameter of the drive shaft 50 and reducing the height of the electric motor 43, the blind spot of the operator who rides on the vehicle body 10 and operates the forklift 1 can be reduced.

  The present invention is not limited to the above-described embodiment, and the configuration of the above-described embodiment can be changed as appropriate. For example, the present invention can be implemented by changing the above configuration as follows. The following changes can also be combined.

  If the power of the electric motor 43 is transmitted to the sprocket 44 and the chain 47 via the drive shaft 50, the rotation of the input unit 51 may be transmitted to the drive shaft 50 without using the key 52. The rotation of the drive shaft 50 may be transmitted to the sprocket 44 without using it. For example, the rotation of the input unit 51 can be transmitted to the drive shaft 50 by fitting of spline grooves (not shown) formed on the inner periphery of the input unit 51 and the outer periphery of the drive shaft 50. The input unit 51 may be configured integrally with the drive shaft 50, and the input unit 51 may be formed by a part of the drive shaft 50.

  If the drive shaft 50 can be rotatably supported, the configuration of the bearing devices 61 and 62 may be changed as appropriate. For example, the number of rolling bearings constituting each of the bearing devices 61 and 62 may be changed. Moreover, you may comprise the bearing apparatuses 61 and 62 with contact bearings or non-contact bearings other than a rolling bearing.

  As long as the power of the electric motor 43 can be transmitted to the drive shaft 50, the arrangement and shape of the electric motor 43 may be changed as appropriate. Further, the fixing structure of the electric motor 43 may be changed as appropriate.

  The housing 71 can be fixed to the lower frame 81 without using the link 91. That is, the structure for fixing the housing 71 and the lower frame 81 to each other may be changed as appropriate.

  The lifting device 40 may include a single mast or a multi-stage mast having three or more stages. In other words, the mast 41 may not be a two-stage mast as long as the elevating body moves up and down by driving the chain hung on the sprocket 44.

  The present invention can also be applied to a cargo handling vehicle other than the reach type forklift 1. For example, the present invention can be applied to a counterbalance type forklift, and can also be applied to a picking lift provided with a cab that moves up and down.

1 Forklift (handling vehicle)
DESCRIPTION OF SYMBOLS 10 Vehicle main body 20 Traveling apparatus 30 Cargo handling apparatus 31 Fork (elevating body)
40 Elevating device 41 Mast 41A Outer mast 41B Inner mast 42 Carriage (elevating body)
42A Lift bracket 43 Electric motors 44-46 Sprocket 47, 48 Chain 47A, 48A One end 47B, 48B The other end 49 Reducer 49A Output gear 50 Drive shaft 50L Left end 50R Right end 51 Input 51A Gear part 51B First small diameter part 51C 2nd small diameter part 52, 53 Key 61, 62 Bearing device 61A 1st rolling bearing 61B 2nd rolling bearing 62A Rolling bearing 62B Cover 71 Housing 72 Seal member 81 Lower frame 82L Left flange part 82R Right flange part 83 Through hole 84 Flange Portion 91 Link 91A One end 91B Other end 92 Support shaft 93, 94 Bolt X Front-rear direction Y Left-right direction Z Vertical direction

Claims (5)

A pair of masts extending in the vertical direction and spaced from each other in the horizontal direction ;
An elevating body provided to be movable up and down with respect to the pair of masts;
An electric motor for generating power for raising and lowering the elevating body;
A single drive shaft that is rotated by the power of the electric motor;
A chain through which the power of the electric motor is transmitted via the drive shaft,
A lifting device in which the lifting body moves up and down by driving the chain,
The electric motor is disposed between the pair of masts and behind the mast, and the drive shaft is configured so that a rotation axis of the drive shaft does not coincide with a rotation axis of a rotor included in the motor. Are provided at intervals,
The one drive shaft extends in the left-right direction, and has a right end and a left end provided with a sprocket on which the chain is hung.
The lifting device further includes:
Together provided between the right end portion and the left end portion of the one of the drive shaft, an input unit for transmitting the rotational power of the motor to rotation of said drive shaft,
Wherein the input unit is provided in an each of the right end portion and the left end portion, the lifting device characterized in that it comprises a bearing device for rotatably supporting the drive shaft. The input portion includes a gear portion formed with external teeth connected to the electric motor, a first small diameter portion that is continuous with a right end of the gear portion and has an outer diameter smaller than that of the gear portion, and the gear. A second small diameter portion that is continuous with the left end of the portion and has a smaller outer diameter than the gear portion,
The said bearing apparatus provided in the said input part is provided with the 1st rolling bearing which supports the said 1st small diameter part, and the 2nd rolling bearing which supports the said 2nd small diameter part. The lifting device described. The bearing device provided in the input unit is attached to the inside of a housing that covers the input unit,
The bearing devices provided at the right end and the left end are attached to a lower frame connected to the lower end of the mast,
The elevating device according to claim 1 or 2, wherein the housing is fixed to the lower frame. The housing is fixed to the lower frame via a link;
The elevating device according to claim 3, wherein the position of the housing relative to the lower frame can be adjusted in a state where the link is not fixed to the lower frame. The lifting device according to any one of claims 1 to 4,
A cargo handling vehicle comprising: a vehicle main body that moves together with the lifting device.

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