JPH01226410A - Mounting device for rear axle beam - Google Patents

Abstract

PURPOSE:To prevent the occurrence of jolting and the generation of noise by a method wherein, in a title beam for a fork lift truck, a slide contact surface between the one shaft pin for supporting a beam and a bearing is formed in the shape of a spherical surface to form spherical contact. CONSTITUTION:A rear axle beam 1 is supported to bearings 53 and 54, mounted to frames 41 and 42 of a truck 4, by means of shaft pins 2 and 3. In this case, the shaft pin 2 is formed in a circular shape in radial cross section, and a cross section in an axial direction forms a slide surface, a slide surface 21 of the shaft pin 2 of the bearing 53 forms a recessed arcuate surface 531. A shaft pin 3 and the bearing 54 are formed in the same columnar shape as that of a conventional one. In this constitution, movement is blocked by means of the shaft pin 2, positioning is reliably effected, the shaft pin 3 performs operation to escape the positions and the sizes of the rear axle beam and the two shaft pins, and the generation of noise can be prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention does not generate rattling or abnormal noise.

This invention relates to a mounting device for a rear axle beam of a forklift truck.

[Prior art]

As shown in FIGS. 3 to 5, in the counter-type forklift truck 7, the rear axle beam 1 for supporting the rear wheels 71 is rotated ( (swivel).

Conventionally, the mounting state of the rear axle beam 1 and the frame 42 is as shown in FIG.
A shaft pin 8 fixed to the rear axle beam 1 is inserted and pivotally connected to the rear axle beam 1 through a bearing 61. Further, the base portion 81 of the shaft pin 8 is fixed to the mounting support 11 of the rear axle beam 1 with a bolt or the like.

The shaft pin 8 is provided along the front-rear direction of the forklift truck 7 (see FIG. 4).

Further, the shaft pin 8 has a cylindrical shape, and the inner circumferential surface 61 of the bearing 61
1 has a cylindrical inner surface having approximately the same dimensions as the outer circumferential surface 801 of the shaft pin 8. In other words, the shaft pin 8 and the bearing 61 are mutually
It has a cylindrical (cylindrical) contact surface along the front-rear direction of the forklift truck 7, and between the base 81 of the shaft pin 8, the frame 42, and the bearing 61, there is a dimension in the axial direction. A slight gap A is provided to provide an escape effect.

[Problem to be solved]

By the way, in the conventional rear axle beam attachment device, the shaft pin 8 is cylindrical as shown in FIG.
This axial movement, which tends to move within the bearing 61 in its axial direction (that is, in the traveling direction of the forklift truck), is as described above.

This occurs in the gap A between the base 81 of the shaft pin 8, the frame 42, and the bearing 61. This longitudinal movement causes the rear axle beam to swing (rattling) and generates abnormal noises such as squeaks.

Therefore, conventionally, a shim 15 such as a steel plate has been interposed in the gap A to prevent this rattling and abnormal noise.

However, this shim 15 has a thickness of approximately 0.3 to 1.0 degrees.
Since it is as thin as 2 m and subjected to pressure contact or friction by the heavy forklift truck chassis, the friction 6 is severe. Furthermore, as this wear progresses, the rear axle beam shakes and generates abnormal noise as described above.

In view of these problems, the present invention was made as a result of studying the structure itself of a rear axle beam mounting device, and aims to provide a rear axle beam mounting device that does not rattle or generate abnormal noise. .

[Means for solving problems]

The present invention provides a forklift truck having a pair of bearings provided in a frame of a chassis of the forklift truck, a pair of shaft pins rotatably connected to both bearings, and a rear axle beam supported by the shaft pins. Installation of a rear axle beam of a forklift truck, wherein the shaft pin has a spherical sliding surface on which it slides with the bearing, and the bearing that pivotally supports the shaft pin has a concave arc surface that fits with the spherical surface of the shaft pin. It's in the device.

What is noteworthy about the present invention is that in a pair of shaft pins that support the rear axle beam, the sliding surface of one shaft pin is spherical.

The radius of curvature of this spherical surface is 3.5 to 4. OCI is preferable; if it is smaller than 3.5CI, the shaft pin will be deeply enclosed in the bearing and its rotation will be insufficient.

Moreover, if it exceeds 4.Ol, looseness tends to occur.

However, the sliding surface of the other shaft pin remains cylindrical as in the prior art.

Further, the sliding surface of the bearing that pivotally supports the one-spherical shaft pin has a concave arc surface that is approximately the same shape as the spherical surface of the shaft pin.

[Action and effect]

In the present invention, the sliding surface of one shaft pin has a spherical shape, and the sliding surface of the other shaft pin has a cylindrical shape as in the prior art. Therefore, the spherical sliding surface of one of the axle pins is pivoted so as to be rotatable twice, as if contained in a bearing of the chassis frame. Since the sliding surface of the other shaft pin is cylindrical,
It is free in the axial direction relative to the bearing.

Therefore, the rear axle beam fixedly supported by the axle pins on both sides is prevented from moving in the axial direction of the axle pin by the spherical sliding surface of one axle pin.

In other words, the one shaft pin functions to position the rear axle beam. Further, the other cylindrical shaft pin exerts a relief effect on the positional dimensions of the rear axle beam and both wheel pins.

Therefore, according to the present invention, it is not necessary to provide the gap between the shaft pin and the bearing as in the past, and to interpose a shim in this gap A to adjust the gap.
The rear axle beam is exclusively attached to one shaft pin so that it can rotate once through one spherical sliding surface as described above, so there is no rattling of the rear axle beam and no abnormal noises such as squeaks occur. .

[Example] - A rear axle beam attachment device according to this example will be explained using FIGS. 1 and 2.

The mounting device of this example consists of two frames 41 and 42 vertically installed below the chassis 4, a rear axle beam 1, and one axle pin 2 and the other axle pin 3 fixed to the rear axle beam 1. .

One of the shaft pins 2 is fixed to the mounting support 11 of the rear axle beam 1 by a base 22.

Further, the shaft pin 2 has a circular cross section in the diametrical direction as shown in FIG. 2, and a sliding surface 21 thereof in the axial cross section has a spherical shape as shown in FIG. That is, this one shaft pin 2 has a spherical sliding surface 21. This spherical surface had three curvature radii of 3.5 cm. Further, the bearing 53 that pivots the sliding surface 21 has a concave arc surface 531 so as to enclose the spherical sliding surface 21 . The bearing 53 is installed by fixing the lower plate 51 provided with a bearing hole to the frame 41 also provided with a bearing using bolts.

Next, the other shaft pin 3 has a cylindrical shape like the conventional shaft pin and is fixed to the mounting support 11 of the rear axle beam by means of a base 32. Further, the shaft pin 3 has a circular cross section in the diametrical direction, a cylindrical cross section in the axial direction, and a sliding surface 31 thereof.
has a straight line shape. The bearing 54 that pivots the sliding surface 31 has a cylindrical sliding surface 541. Further, like the bearing 53, the bearing 54 is arranged by fixing the frame 42 and the lower plate 52, each having a bearing hole, with bolts 58.

Since the mounting device of this example is configured as described above, one shaft pin 2 is mounted so that its spherical sliding surface 21 is enclosed by the concave arc sliding surface 531 of the bearing 53. . Further, since the other shaft pin 3 has a cylindrical shape, it is in a free state in the axial direction.

Therefore, the movement of the rear axle beam 1 is prevented by one of the shaft pins 2, and the positioning of the rear axle beam 1 is ensured. Also,
The other axle pin 3 exhibits a relief effect for the rear axle beam and the position of both axle pins.

Therefore, according to the mounting device of this example, rattling of the rear axle beam and occurrence of abnormal noise can be prevented. Further, there is no need to interpose a shim as in the conventional case, and therefore, there is no need to replace the shim.

[Brief explanation of the drawing]

1 and 2 show a rear axle beam mounting device according to an embodiment, FIG. 1 is a side sectional view thereof, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIGS. Figure 6 shows a conventional rear axle beam attachment device, Figure 3 is a side view showing it installed on a forklift truck, and Figure 4 shows a conventional rear axle beam attachment device.
The figure is a rear view of the above mounting device, FIG. 5 is a plan view, and FIG. 6 is a sectional view taken along the line B-B vA in FIG. 5. 110. rear axle beam. 2110 Axial pin with spherical surface. 3013 Cylindrical shaft pin. 400. Chassis, 41.42. ,,flame. 53.54. ,,bearing. 810. Traditional axis pin. Applicant Toyota Industries Corporation Representative Patent Attorney Yoshiyasu Takahashi Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] In a forklift truck having a pair of bearings provided in the frame of the chassis of the forklift truck, a pair of axle pins rotatably connected to both bearings, and a rear axle beam supported by the axle pins, one of the axle pins is configured as described above. A mounting device for a rear axle beam of a forklift truck, wherein the sliding surface with the bearing is a spherical surface, and the bearing that pivotally supports the shaft pin has a concave arc surface that fits with the spherical surface of the shaft pin.