JP2010105646A - Flange mounting structure of wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, in a conventional drive wheel, the wheel itself is a transmission, and the wheel wide in a width in which a gear train and an electric motor are built, and rigid in structure, and thereby the whole wheel should be disassembled when changing a tire. <P>SOLUTION: In a drive system, a drive wheel 2 is a cylindrical wheel 3, and has a transmission 11 of a gear train 16 built in the wheel 3, an electric motor 13 is connected to the transmission 11 for an input, and a brake 14 is provided at a motor shaft 15 of the electric motor 13. An engagement surface 8 for transmitting a drive force to the wheel 3 is provided at an output shaft 17 projected from the transmission 11. A rigid bearing 10 for supporting the wheel 3 is provided on an outer circumferential surface of the transmission 11. The wheel 3 is suitable for the engagement surface 8 from the outer part of the drive system. By allowing the wheel 3, the transmission 11 and the electric motor 13 to be separated from one another, the weight reduction and the exchange property of the wheel 3 can be facilitated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wheel support structure for a drive wheel that travels a transport carriage, and relates to a wheel bearing that can be made lighter, stronger, and easily replaced by reducing the wheel bearing size and increasing rigidity. .

The drive wheels of the conventional transport carriage are arranged along the inner periphery of the stator, the housing provided with the cylindrical part that the drive motor extends in the axial direction, the stator arranged along the outer periphery of the cylindrical part, and And a rotating shaft fitted to the rotor and extending outward, the rotating shaft is input to the transmission, and the output of the transmission is transmitted to rotate the wheel.
JP2008-17588

However, in this drive wheel, it is necessary to reduce the outer diameter of the transmission in order to reduce the diameter of the wheel. However, in order to strengthen the wheel, the thickness of the wheel itself has been increased.
Furthermore, bearings were increased and the wheel itself was a transmission. If the road is a rough road, the shock, load, vibration, etc. applied to the transmission will be transmitted as a negative effect directly on the gears, causing abnormal noise, noise, oil leakage due to bearing damage, tooth surface damage, etc.・ It is possible to receive a repair request for wheel replacement. This repair requires time and effort to remove the drive wheels from the transport carriage and disassemble all of the drive motor, transmission, and wheels. In addition, when the tires are worn down and replaced, it is necessary to disassemble the entire tire in the same manner as the repair described above, which requires time and labor.

  In the present invention, the wheel and the transmission are separated from each other instead of an integral structure, so that the wheel can be rotatably supported by the outer diameter of the case body of the transmission, and the output shaft projects from the case body to the central portion. Adhering with a contact surface and a locking part. Since the drive motor, transmission, and wheel are separated, it is possible to disassemble and repair only the repaired part, and to replace the tire, the wheel can be easily removed and replaced from the transmission of the transport carriage. It is to provide.

According to the first aspect of the present invention, there is provided a drive wheel of a transport carriage provided with a cargo bed that travels along a passage. The drive wheel has a cylindrical wheel fitted with a tire on its outer peripheral surface, a gear group of the transmission is built in, and an electric motor that inputs to the transmission is connected. An electric motor is a drive device that is provided with a brake on a motor shaft and is input to the electric motor.
The transmission projects an output shaft having an engagement surface and a locking portion, and transmits a driving force to the wheel.
The outer peripheral surface of the case body of this transmission is covered with a bearing that allows the wheel to rotate, and the wheel can be attached from the outside of the drive unit. The drive wheel is configured such that the wheel, the transmission, and the electric motor are separately formed.

According to a second aspect of the present invention, the engagement surface of the output shaft according to the first aspect includes a vertical surface with which the central portion of the wheel abuts. This vertical surface regulates the mounting angle of the wheel. And the latching | locking part which transmits a driving force to a wheel is provided, and it is set as the structure which transmits a rotational force as a driving wheel.
According to a third aspect of the present invention, there is provided a bearing on the outer peripheral surface of the transmission according to the first aspect, wherein the load applied to the wheel is integrated with the outer peripheral surface of the case body and the outer peripheral surface of the bearing, and the rigidity is integrated. The abutting portion that is fitted to the shaft and the output shaft that transmits the driving force are transmitted from the flange to the side plate so that the output shaft can rotate around the driving rotation of the output shaft.
In a fourth aspect of the present invention, the bearing supporting the wheel of the first aspect is configured such that the cross-sectional shape of the outer peripheral surface of the tire surface is an arc shape and is positioned at the apex of the arc shape.

In the configuration of claim 1, since the wheel, the transmission, and the electric motor are separated, the wheel of the driving wheel can be easily replaced, and the bearing is downsized by the combined strength of the outer peripheral surface of the transmission and the bearing. There is an action that can be done.
In the configuration of the second aspect, the wheel can be accurately fitted to the bearing, and there is an effect that the driving force of the transmission can be transmitted efficiently.
In the configuration of claim 3, since the rigidity of the bearing can be increased, the load applied to the wheel can be absorbed by the bearing, the load applied to the side plate is reduced, and the wheel itself is reduced in thickness and weight. There is an action that can be done.
In the configuration of the fourth aspect, since the apex of the arc has a high peripheral speed, the load is concentrated on the apex, and the load applied to the tire can be concentrated on the bearing.

According to the first aspect of the present invention, there is an effect that the wheel can be rotated at high speed and the wheel can be easily replaced by reducing the weight of the wheel.
In the invention of claim 2, there is an effect that the wheel and the output shaft can be accurately attached.
In the invention of claim 3, the load is concentrated at the center of the tire, and the portion is made a strong bearing by the rigidity of the case main body and the rigidity of the bearing, so that even a lightweight wheel can sufficiently withstand the load. .
In the invention of claim 4, since the load received by the tire is concentrated on the arcuate apex, by placing the bearing at this apex, the bearing receives the full load. There is an effect that can be done.

  The drive wheel 2 mounted on the transport carriage 1 of the present invention will be described with reference to FIGS. Even if the driving wheel 2 has a longer travel distance due to the operation of the transport carriage 1 and the tire 4 is worn down and needs to be replaced, the wheel 3 can be easily removed and the wheel 3 can be reduced in weight. The structure of mounting the flange 6 is provided such that the wheel 3 is supported by the strong bearing 10. FIG. 1 shows a part of a drive wheel 2 of a transport cart 1, a cargo bed with a horizontal floor, a driver's cab that is formed in a box shape with electric parts such as a control device and a manual operation device, A plurality of drive wheels 2 and driven wheels (not shown) are disposed on the lower surface.

  The plurality of some drive wheels 2 have a steering function independently on each of the left and right drive wheels 2 and controlled in the axial direction so as to have a minimum turning diameter. The transport cart 1 can be steered by the driver, but can normally travel along a predetermined path by automatic driving. In the determined path, the traveling direction of the transport carriage 1 advances to the destination, the return moves backward or turns, and the traveling is turned back, and the traveling direction proceeds in a straight line, a curved surface, a curve, a right angle, and the like. While traveling, the vehicle travels while sounding a warning sound, buzzer, voice, music, etc. that informs that the carriage 1 is approaching.

  The drive wheel 2 is provided with a tire 4 on a cylinder of a metal wheel 3, a side plate 5 is attached to a side surface, a flange 6 is attached to a central portion to form a support portion, a wheel is formed and fixed to an output shaft 17. I am letting. A transmission 11 is built inside the wheel 3, an electric motor 13 is connected to the transmission 11, and an electromagnetic brake of a brake 14 is disposed so as to be rotatable on the same axis. On the outer peripheral surface of the wheel 3, a tire 4 covered with rubber, urethane, or the like, which is a cushioning material that reduces the impact of the passage, is formed. The tire 4 is arranged with a transmission 11, an electric motor 13, and a brake 14 incorporated therein, and rotates a small and lightweight driving wheel 4.

The drive wheel 2 disposed on the lower surface of the driver's seat can rotate the wheel 3 to the right or left by the rotation of a turning motor (not shown). A load is placed on the loading platform and travels to the destination by the rotation of the drive wheels 2. The driving wheel 2 receives the weight of the loading platform and the load, and the tire 4 travels while being driven and rotated by the ground contact of the central portion, so that transmission and braking performance of the driving force is easily concentrated on the central portion. . On the other hand, the tire 4 when turning is partly dotted from the center of the surface of the tire 4, so that the resistance to turning is significantly small, and a small turning motor is possible.

  FIG. 2 illustrates the power transmission of the drive wheels 2. The drive rotation of the motor shaft 15 of the electric motor 13 is transmitted to the gear group 16 of the transmission 11 and is output from the output shaft 17 at a low rotation with high torque. The The output shaft 17 is coaxial with the motor shaft 15 and becomes the center of the gear group 16 that rotates at high speed in the same direction. The flange 6 surface of the wheel 3 includes a vertical surface 23, and the engagement surface 8 to be attached is also a vertical surface. 23, it can adhere and can obtain the stable rotational force. The engagement surface 8 is a disc fixed at a right angle in the axial direction, and the flange 6 is in contact with the disc, so that the wheel 3 can be accurately attached at a right angle to the shaft.

  Further, a shaft protrudes from the engaging surface 8 to form a spline 7 as a locking portion on the outer peripheral surface. The flange 6 of the wheel 3 is provided with the symmetric spline 7a on the inner peripheral surface provided with a through hole in the center. The end surface forming the spline 7 of the output shaft 17 is provided with a tap screw 24. The spline 7a of the flange 6 is pressed by a disc-shaped stop plate 19 and screwed by a set bolt 20 to be engaged with the output shaft 17 and the flange 6. To fix.

  The case main body 12 of the transmission 11 is fixed to the frame of the transport carriage 1 with a base 18 and has a circular outer appearance with a thick wall. A bearing 21 is fitted to cover the outer peripheral surface. It is combined. The bearing 21 is strong enough to withstand the load applied to the tire 4, and is a bearing 10 having a strength combined with the outer peripheral surface of the case body 12. The inner peripheral surface of the wheel 3 is provided with a contact portion 9 to which the bearing 21 is fitted, and a through hole 22 is provided at the center of the flange 6 as a side surface. The through hole 22 is provided with an inner periphery in the spline 7a. 5, the inner peripheral surface and the flange 6 are connected. The side plate 5 transmits power from the output shaft 17 to the tire 4 on the outer peripheral surface of the wheel 3, and the weight of the transport carriage 1 is not applied.

  In FIG. 3, the electric motor 13 and the transmission 11 are connected, and the output shaft 17 protrudes from the transmission 11. The transmission 11 fixes the case main body 12 to the frame of the transport carriage 1. The motor shaft 15 of the electric motor 13 rotates at a controlled high speed, is input to the transmission 11, and is changed from the output shaft 17 to a low torque rotating high torque rotation. The output shaft 17 includes a spline 7 that engages with the spline 7 a on the inner peripheral surface of the through hole 22 of the flange 6 on the outer peripheral surface, transmits a driving force to the wheel 3, and rotates as the tire 4.

  FIG. 4 shows a wheel, which is a cylindrical driving wheel 2 formed by a tire 4, a wheel 3, a flange 6, and a side plate 5, and an abutting portion 9 to which a bearing 10 is fitted on the inner peripheral surface of the wheel 3. And is supported by applying a load to the contact portion 9. The side plate 5 is a circular plate material that transmits the driving force of the flange 6 to the wheel 3. The side plate 5 has a thin cross-section, but can be efficiently transmitted with high rigidity in the rotation direction. In addition, it may be in the form of a designed spoke. To prevent the flange 6 from coming off from the output shaft 17, a disk stop plate 19 larger than the diameter of the through hole 22 is attached and fixed to the end surface of the output shaft 17 with a stop bolt 20.

  The tire 4 is often made of urethane or rubber, and has high elasticity and high braking force. The tire 4 can safely and accurately transport the load of the transport carriage 1, and the tire width can be increased with the bearing 10 as the center. It is formed in a circular arc shape with the center of the cross-sectional shape at the apex. Since the tire 4 running on the transport carriage 1 has a high circumferential speed at the apex of the circular arc of the cross-sectional shape, the load can be concentrated in the center, and the strong bearing 10 is arranged at that portion, so that the tire 4 is small. It is possible to make the driving wheel 2 lightweight.

  When the tire 4 is worn down or cracked due to the operating condition of the transport carriage 1, the drive wheel 2 first raises the vehicle body and removes the stop bolt 20 that stops the wheel 3 to remove the stop plate. By removing 19, the wheel 3 can be detached from the spline 7 of the output shaft 17. Since the wheel 3 is fitted to the bearing 21 of the bearing 10, the wheel 3 is knocked out by a rich hammer or pulled out by pulling out a pulley and removed. Further, the flange 6 is provided with a plurality of tap screws, and the bolts are screwed into contact with the engaging surface 8 so that the wheel 3 is gradually separated from the bearing 21 each time the wheel 3 is screwed from the engaging surface 8. You may make it remove.

  Next, when the old wheel 3 is removed, first, the new wheel 3 is slightly fitted into the bearing 21, and the wheel 3 is manually rotated to lock the splines 7 and 7a of the output shaft 17, and the periphery is evenly distributed with a rich hammer or the like. In order to make the entire contact portion 9 approach the bearing 21 evenly by striking it, the vertical surface 23 of the engagement surface 8 and the flange 6 surface is brought into close contact with each other so that the wheel 5 is brought to an accurate position. Can be attached. Thus, the flange 6 can be positioned at a right angle with respect to the engagement surface 8, and in order to maintain this position, the tap screw 24 provided on the end surface of the output shaft 17 is connected to the end surface of the flange 6 with the stop plate 19. , And the fixing bolt 20 is screwed and fixed, so that the tire can be mounted accurately and safely, and the replacement is completed.

  The perspective view which shows a conveyance trolley | bogie.   Sectional drawing explaining the inside of a driving wheel.   The perspective view explaining the bearing which removed the wheel of the drive wheel.   The perspective view which divides | segments and demonstrates a wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carriage 2 Drive wheel 3 Wheel 4 Tire 5 Side plate 6 Flange 8 Engagement surface 9 Contact part 10 Bearing 11 Transmission 12 Case main body 13 Electric motor 17 Output shaft

Claims (4)

In the drive wheel of a transport carriage equipped with a cargo bed that travels along a passage,
The driving wheel includes a cylindrical wheel, and a tire is fitted on the outer peripheral surface of the wheel, and a transmission of a built-in gear group is connected, and an electric motor that inputs to the transmission is connected,
A drive device formed with a braking device on the motor shaft of the electric motor;
An engagement surface for transmitting a driving force to the wheel on an output shaft protruding from the transmission;
A bearing for supporting the wheel on the outer peripheral surface of the transmission to be rotatable;
The wheel allows attachment to the engagement surface from the outside of the drive,
A wheel flange mounting structure, wherein the wheel, the transmission, and the electric motor are formed separately.   The engagement surface of the output shaft includes a vertical surface and a locking portion at the center of the wheel, the vertical surface regulates the mounting position of the wheel, and the locking portion transmits a driving force to the wheel. The wheel flange mounting structure according to claim 1.   The wheel is fitted with a bearing on the outer peripheral surface of the case body to make it an integral bearing, so that the load of the tire part can be supported, the driving force of the output shaft is transmitted from the flange to the side plate, and transmitted from the side plate to the wheel. The wheel flange mounting structure according to claim 1, wherein:   The wheel flange mounting structure according to claim 1, wherein the bearing supporting the wheel is positioned at the apex of the arc shape with a cross-sectional shape of the outer peripheral surface of the tire surface being an arc shape.

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