JP2005075506A - Forklift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate adjustment of a clearance gap between a disk and a coil in a disk brake device. <P>SOLUTION: The disk 12 of the disk brake device 10 is provided with two or more pins 12a projected toward the outside of a car body. A wheel hub 8 is provided with two or more pin holes 8b where pins 12a are inserted toward the inside of the car body. A screw hole 8c directed toward the outside of the car body is provided on the same axis with the pin hole 8b. With the pin 12a inserted in the pin hole 8b, a support plate 13 is fixed to the outer end part of the pin 12a, and a spring 14 is provided between the support plate 13 and the wheel hub 8. An adjust screw 15 for pressing the support plate 13 is screwed on to the screw hole 8c and the support plate 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a forklift, and in particular, improves workability of assembly work and maintenance work.

  Conventionally, it has been demanded that a forklift can appropriately control a vehicle body posture during traveling, and a forklift that can be slipped on a slippery road surface and can be braked more safely. Has been developed. For example, as described in Patent Document 1 to Patent Document 3 below, a reach-type forklift having a brake device on a front wheel which is a driven wheel has been developed. An electromagnetically actuated disc brake device that attracts and brakes is used.

  In addition to the one described in Patent Documents 1 to 3, the disk brake device includes, for example, a device that adjusts the gap between the disk and the coil with an adjustment bolt (see the following Patent Document). .

JP 2001-151494 A JP 2003-194110 A JP 2003-222169 A Japanese Utility Model Publication No. 57-202027

  When an electromagnetically operated disc brake device is used as a brake device for a forklift, the gap between the disc and the coil must be adjusted appropriately. Further, it is necessary to keep the gap between the disk and the coil properly in accordance with the progress of wear of the contact portion with use.

  SUMMARY OF THE INVENTION An object of the present invention is to facilitate adjustment of a gap between a disk and a coil of a disk brake device.

  In order to achieve the above-described object, the present invention is configured such that a wheel hub and a wheel including a tire provided on an outer periphery of the wheel hub are fitted to an axle projecting outward from the vehicle body, In the forklift that enables the wheel to rotate around the axle, a cylindrical coil provided at a base end portion of the axle, and a coaxial coil arranged on the tip end side of the axle with respect to the coil, the axle An electromagnetically actuated disc brake device having a disc-like disc movable in the axial direction of the disc, and a plurality of pins projecting outward from the vehicle body, and the wheel hub includes a vehicle body There are provided a plurality of pin holes into which the pins are inserted and screw holes that are coaxial with the pin holes and directed outward of the vehicle body. Inserted and up A structure in which a support plate is fixed to the outer end portion of the pin, a spring is provided between the support plate and the wheel hub, and an adjustment screw is screwed to press the support plate into the screw hole. It is said.

  According to such a configuration, when the adjustment screw is tightened to the inside of the vehicle body, that is, the base end side of the axle, the adjustment screw presses the support plate, and the disc is the base end side of the axle, that is, the coil side. And the gap between the disk and the coil is narrowed. On the other hand, when the adjustment screw is loosened to the outside of the vehicle body, that is, toward the front end of the axle, the support plate and the disk are moved toward the front end of the axle, that is, opposite to the coil by the elastic restoring force of the spring. This widens the gap between the disk and the coil. Therefore, the gap between the disk and the coil can be adjusted by tightening or loosening the adjusting screw.

  In the present invention, the vehicle body includes a leg extending forward, the axle is an axle shaft projecting outward from the leg, and the wheel is a shaft of the axle shaft. The front wheel can be configured to be rotatably supported around the center, and thus the adjustment of the clearance between the disk and the coil in the forklift having the front wheel on the leg and the disk brake device for braking the front wheel can be easily performed. To be able to do so.

  According to the present invention, the gap between the disk and the coil can be adjusted by tightening or loosening the adjustment screw screwed into the screw hole of the wheel hub, so that the gap can be easily removed without removing the wheel. Adjustments can be made. Therefore, a large work is not required at the time of assembling the wheel on the axle or daily maintenance, and the workability is greatly improved.

  As shown in FIG. 1, the reach forklift according to the present embodiment includes a pair of left and right reach legs 2 extending forward from the vehicle body frame 1 and a lift device 3 movably in the front-rear direction. The lifting device 3 performs a cargo handling operation by lifting the load to a high place or unloading the load from the high place. The left and right reach legs 2 are each provided with a front wheel 4 so as to be rotatable. The front wheel 4 and the rear wheel 5 provided below the rear part of the vehicle body frame 1 are used for traveling.

  As shown in FIG. 2, the front end portion of the reach leg 2 is a wheel housing 2a that opens outward and downward and accommodates the front wheel 4. The reach leg 2 is accommodated in the wheel housing 2a. An axle shaft 6 as an axle for supporting the front wheel 4 protrudes from the outside toward the outside. The front wheel 4 includes a wheel hub 8 and a tire 9 fitted on the outer periphery of the wheel hub 8. As shown in FIG. 3, the wheel hub 8 is fitted to an axle shaft 6 via a bearing 7. The front wheel 4 is rotatable around the axis of the axle shaft 6. The front wheel 4 is not allowed to move in the axial direction of the axle shaft 6 with respect to the axle shaft 6 by a lock nut screwed to the distal end portion, that is, the outer end portion of the axle shaft 6, and is displaced in the axial direction. It is made to rotate without doing.

  As shown in FIG. 3, the wheel hub 8 of the front wheel 4 is provided with a through hole 8 a into which the axle shaft 6 is inserted and a bearing 7 is fitted in the center portion. Four pin holes 8b are formed at equal intervals in the circumferential direction toward the base end side of the axle shaft 6. Further, the wheel hub 8 is provided with four screw holes 8c, which are coaxial with the pin hole 8b and directed outward of the vehicle body frame 1, with a diameter larger than that of the pin hole 8b, in the same four places as the pin hole 8b. Yes. The pin hole 8b and the screw hole 8c are formed so as to communicate with each other. When a pin 12a described later is inserted into the pin hole 8b from the inside, the tip end of the pin 12a enters the screw hole 8c. Has been.

  Further, in the wheel housing 2a, as shown in FIG. 3, a coil 11 supplied with power from a power supply device (not shown) mounted on the body frame 1 and a disk attracted by the excited coil 11 are provided. 12 is provided. The surface of the coil 12 attracted by the coil 11 contacts the surface of the coil 11 on the coil 11 side and the surface of the coil 11 on the disk 12 side. It is supposed to occur. The coil 11 is formed in a cylindrical shape and is fixed to the reach leg 2 in a state where it is inserted into a base end portion fixed to the reach leg 2 of the axle shaft 6 and is mounted on the vehicle body frame 1 by an electric wire (not shown). Connected to the power supply. The disk 12 is formed in a disc shape, and is arranged coaxially with the coil 11 at a position closer to the distal end side of the axle shaft 6 than the coil 11, and is supported so as to be movable in the axial direction of the axle shaft 6 with respect to the coil 11. Yes.

  On the disk 12, four pins 12 a project from the body frame 1 in parallel to the axial direction of the axle shaft 6. The pin 12a is formed in a columnar shape having a slightly smaller diameter than the pin hole 8b of the wheel hub 8, and a screw hole 2b into which a screw 16 (to be described later) is screwed is provided at the distal end portion, that is, the outer end portion of each pin 12a. It has been drilled. As shown in FIG. 3, the front wheel 4 and the disc brake device 10 are attached to the axle shaft 6 in a state where the pin 12 a is inserted into a pin hole 8 b provided in the wheel hub 8. At this time, the tip of each pin 12a is inserted into the screw hole 8c, and the support plate 13 formed in a disk shape having a diameter larger than the pin hole 8b and somewhat smaller than the screw hole 8c is provided on the pin 12a. It is fixed to the tip of the screw with screws. Further, a spring 14 formed in a coil shape is pinned between a surface of the support plate 13 facing inward of the vehicle body frame 1 and a bottom surface of the screw hole 8c (surface facing outward of the vehicle body frame 1). In the state inserted in 12a, it is provided so that it can expand-contract in the axial direction of pin 12a, that is, the axial direction of axle shaft 6. Further, an adjustment screw 15 is screwed into the screw hole 8c provided in the wheel hub 8 from the outside of the body frame 1, and is supported via a screw 16 on the surface of the adjustment screw 15 facing the inside of the body frame 1. The surface of the plate 13 facing the outside of the body frame 1 is pressed.

  Here, when the adjustment screw 15 is tightened into the screw hole 8c, the spring 14 is pushed and contracted by being pushed by the support plate 13, and the support plate 13 and the pin 12a are pushed toward the proximal end side of the axle shaft 6. . As a result, the disk 12 is brought closer to the coil 11 and the gap G between the coil 11 and the disk 12 is narrowed. On the other hand, when the adjustment screw 15 is loosened, the support plate 13 is urged outward by the elastic restoring force of the compressed spring 14, whereby the disk 12 is separated from the coil 11 and the gap G is widened. .

  After the gap G between the coil 11 and the disk 12 is properly adjusted with the adjusting screw 15, the coil 11 is energized and excited, and when this disk brake device 10 is operated, the disk 12 is attracted to the coil 11, and the disk 11 Along with the movement of 12 toward the coil 11, the spring 14 is compressed and the disk 12 contacts the coil 11. As a result, the rotation of the disk 12 is prevented, so that the rotation of the wheel hub 8 into which the pin 12a of the disk 12 is inserted, that is, the rotation of the front wheel 4, is also prevented, and the front wheel 4 is braked. When the energization of the coil 11 is cut off, the disk 12 is separated from the coil 11 by the elastic restoring force of the compressed spring 14, but the disk 12, the support plate 13, and the disk 16 until the head of the screw 16 contacts the adjusting screw 15. The screw 16 moves. Therefore, the gap G between the coil 11 and the disk 12 is returned to the previously adjusted state. Of course, when there is a gap G between the coil 11 and the disk 12, the rotation of the front wheel 4 is not prevented, and the front wheel 4 can freely rotate around the axle shaft 6.

  Thus, according to the present embodiment, the gap G between the coil 11 and the disk 12 can be adjusted without removing the front wheel 4, and the adjustment screw 15 can be simply tightened or loosened in the screw hole 8c. Because it is done, it can be adjusted very easily. Therefore, it becomes easy to keep the gap G between the coil 11 and the disk 12 properly, and it is possible to maintain the state where the disk brake device 10 operates normally and to ensure the safety and maneuverability of this reach type forklift. it can. In particular, the reach-type forklift handles the load on the front wheel 4 side, so the load applied to the front wheel 4 is large when there is a load, but the gap G between the coil 11 and the disk 12 is properly maintained and the disk brake device 10 operates normally. By doing so, the front wheel 4 can be braked reliably.

  Further, in the present embodiment, the support plate 13 and the spring 14 are attached to each of the pins 12a arranged at equal intervals in the circumferential direction and are pressed by the adjustment screws 15. It is possible to adjust the tightening condition so that the gap G between the coil 11 and the disk 12 is uniform in each part, and the coil 11 and the disk 12 come into contact with each other and a sufficient braking force cannot be obtained. It is possible to prevent abnormal noise from being generated when the disc brake device 10 is operated.

It is a perspective view of a reach type forklift to which the present invention is applied. It is a side view of the front-wheel part of a reach type forklift. It is sectional drawing of the front-wheel part of a reach type forklift.

Explanation of symbols

1 Body frame 2 Reach leg 4 Front wheel
6 Axle shaft 8 Wheel hub 8b Pin hole 8c Screw hole 9 Tire 10 Disc brake device 11 Coil 12 Disc 12a Pin 13 Support plate 14 Spring 15 Adjustment screw G Gap

Claims (2)

In a forklift in which a wheel including a wheel hub and a tire provided on an outer periphery of the wheel hub is fitted to an axle projecting outward from the vehicle body so that the wheel can rotate around the axle. ,
A cylindrical coil provided at the base end portion of the axle, and a disc-shaped disc that is arranged coaxially with the coil on the tip end side of the axle from the coil and is movable in the axial direction of the axle. Comprising an electromagnetically actuated disc brake device having
A plurality of pins project from the disc toward the outside of the vehicle body,
The wheel hub is provided with a plurality of pin holes into which the pins are inserted toward the inside of the vehicle body, and is provided with screw holes that are coaxial with the pin holes and directed toward the outside of the vehicle body,
In a state where the pin is inserted into the pin hole, a support plate is fixed to the outer end portion of the pin, and a spring is provided between the support plate and the wheel hub, and the support is supported in the screw hole. A forklift, wherein an adjusting screw is screwed to press the plate. It has a leg that extends forward on the vehicle body,
2. The axle according to claim 1, wherein the axle is an axle shaft projecting outward from the leg, and the wheel is a front wheel rotatably supported around an axis of the axle shaft. Forklift.

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