JPS6046283B2 - Gap adjustment shim mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for a gap adjustment shim, and particularly to a structure in which the shim is mounted on a shaft.

Generally, there are many connection mechanisms in which two members formed separately from each other are connected via a shaft, and each of the two members is attached so as to be relatively rotatable. If it is necessary to prevent rattling in the axial direction of the shaft with high precision,
As shown in the figure, a thin plate-shaped gap adjusting shim is inserted into the gap between the two members to prevent the rattling.

For example, Fig. 1 shows the drive unit 1 of a small cargo handling vehicle.
Although only a portion is shown, the above-mentioned connection mechanism is used in the drive unit 1. That is, the drive unit 1 includes a support body 2 constituted by a drive source such as a traction motor,
It is mainly composed of a wheel support 3 rotatably connected to the support 2, and a drive/steering wheel 4 rotatably supported by the wheel support 3 and rotationally driven by the drive source. and
The drive unit 1 is attached to the vehicle body 5 so as to be vertically movable via a link 6 disposed between the support body 2 and the vehicle body 5. That is, each end of the link 6 is pivotally connected to the support body 2 and the vehicle body 5 via a shaft 7 so as to be rotatable and movable. Second
The figure is an enlarged plan view showing the pivot joint between the link 6 and the vehicle body 5, and shows a pair of brackets 8, Ba
A pair of links 6 and 6a are arranged between them, and a shaft 7 is inserted between the brackets 8 and Ba and the links 6 and 6a, and the shaft 7 is used as a pivot to connect the brackets 8 and Ba to the vehicle body 5. In contrast, the links 6, 6a are designed to rotate. 9, 9a are the links 6, 6a
This bush 999a is fitted between the bush 999a and the shaft 7, and the bush 999a is formed with flanges 1O, 10a which are engaged with the outsides of the links 6, 6a.

Reference numeral 11 denotes a lock plate that fits into a one-side notch 12 formed on the outer side of the bracket 8 of the shaft 7 and is fixed to the bracket 8 via a bolt 13. 7 and prevents the brackets 8 and 8a from rotating.

14 is a connecting rod that keeps the distance between the links 6, 6a constant.

By the way, in the structure in which the two members of the brackets 8, 8a1 links 6, 6a are rotatably attached via the shaft 7 as described above, the brackets 8, 8a1 links that are adjacent to each other due to formation errors etc. A slight gap A is formed between the brackets 8 and 6a, specifically between the brackets 8 and 8a and the flanges 10 and 10a of the bushes 9 and 9a.

Therefore, in order to prevent the brackets 8, 8a1 and the links 6, 6a from moving relative to each other in the axial direction of the shaft 7 due to the gap A, a gap adjustment shim (hereinafter simply referred to as shim) is generally provided within the gap A. 15 are arranged. Conventionally, the shim 15, which is attached to the shaft as described above, is formed of a substantially U-shaped thin plate with an open diameter 11 slightly larger than the diameter of the shaft 7, as shown in FIG.
An appropriate number of U-shaped shims 15 are inserted into the shaft 7 between the gaps A. That is, when attaching the shim 15 to the shaft 7, the shim 15 is inserted into the shaft 7 from its open end 15a, and the open end 15a is placed on the tip side of the bracket 8a.
The open end 15a is bent toward the tip of the bracket 8a to prevent the shim 15 from falling out of the gap A. However, in such a conventional shim mounting structure, the shim 15 is formed in a substantially U-shape as described above, and the shim 15 is simply attached to the shaft 7.
If you just plug it in, it will easily fall off. The open end 15a must be bent and locked to another member (bracket 8a).

Therefore, this bending deteriorates work efficiency, and
In order to bend, it is necessary to reduce the thickness of the shim 15 to some extent, and if the gap A is large, a number of shims 15 must be used. Further, a work space is required for bending the open end portion 15a, and there is a problem in that the locations where the shim 15 can be used are limited. In view of these conventional problems, the present invention provides a shim with an insertion hole through which the shaft is inserted, and an opening cut out on one side of the peripheral edge of the insertion hole with a width smaller than the diameter of the shaft to open the insertion hole. and a groove into which the opening of the shim is inserted in the direction perpendicular to the axis of the shaft, and a tapered surface that gradually slopes from the bottom of the groove toward the outer periphery of the shaft on one side of the groove. The shim formed and inserted into the groove and the shaft are moved relative to each other in the direction in which the shim moves in the direction of the tapered surface, and the general axis of the shaft is moved while guiding the inner periphery of the insertion hole by the tapered surface. By fitting the shim into the shaft so that the shim can be reliably attached to the shaft without bending, the shim installation work can be simplified and the shim thickness can be formed as desired. .

Hereinafter, embodiments of the present invention will be described in detail based on the drawings, taking as an example the link attachment part of the small cargo handling vehicle mentioned above as the conventional example, and assigning the same reference numerals to the same parts as this conventional structure. . 4A and 4B respectively show the shim 20 used in the present invention and the shaft 7 to which this shim 20 is attached, and
FIG. 5 shows the link 6, 6a attachment portion of a small cargo handling vehicle, showing a state in which the shim 20 is attached to the shaft 7 using the shim attachment structure of the present invention.

In addition, in this Figure 5, 5 is the vehicle body, 8, 8a are the brackets, and 9
, 9a are bushes provided with flanges 10, 10a. That is, in FIGS. 4 and 5, the shim 20 is a circular thin plate having a diameter larger than the diameter of the flange 10, 10a of the bush 9, 9a (7), and has a diameter larger than the diameter d of the shaft 7 in the center of the shim 20. An insertion opening 21 is formed with a slightly larger diameter to be inserted into the shaft 7, and a width 12 smaller than the diameter d of the shaft 7 is cut out on one side of the peripheral edge of the insertion opening 21.
An opening 22 is formed to open the opening.

On the other hand, the shaft 7 has a portion corresponding to the gap A formed between the brackets 8, 8a and the links 6, 6a when the shaft 7 is inserted into the brackets 8, 8a1 and the links 6, 6a at a predetermined position. Groove portion 23 to be described later
A groove portion 23 into which the opening 22 of the shim 20 is inserted in a direction perpendicular to the shaft axis at a portion moved in the insertion direction of the shaft 7 by a width 13 and a tapered surface 24 length of 15 minutes.
has been formed. That is, the groove 23 is cut out on one side of the circumferential surface of the shaft 7 with a width 13 larger than the thickness of the shim 20, and the diameter 14 between the bottom surface 23a and the other side of the circumferential surface of the shaft 7 is cut out into the opening. 22φ speech. It has a smaller diameter. Further, on one side of the groove portion 23 in the direction opposite to the insertion direction of the shaft 7 (from left to right in the figure), the groove portion 23 is gradually inclined upward from the bottom portion 23a toward the outer periphery of the shaft 7, and in the axial direction of the shaft 7. A tapered surface 24 having a predetermined length 15 is formed on the surface. In this embodiment, a tapered surface 25 similar to the tapered surface 24 is formed on the other side of the groove portion 23 as well. With the above configuration, when the shim 20 is mounted on the shaft 7 using the shim mounting structure of the present invention, the shaft 7 is first attached to the bracket 8, as shown in FIG.
When inserting into the 8a1 links 6, 6a, the links 6, 6a are moved to one side of the brackets 8, 8a (in this embodiment, the left bracket 8), and the links 6, 6a are inserted into the links 6, 6a.
6a and the other bracket 8a. Specifically, a gap A is provided between the bush 9a and the bracket 8a.

Then, in the middle of inserting the shaft 7, the insertion of the shaft 7 is stopped at a position where the groove portion 23 faces the gap A,
As shown in FIG. 6, the opening 22 of the shim 20 is inserted into the groove 23. In this state, the insertion hole 21 of the shim 20
is not yet completely fitted to the outer periphery of the shaft 7, but when the shaft 7 is further inserted, the portion of the gym 20 that comes into contact with the bottom 23a of the groove 23 becomes the tapered surface 24.
The shim 20 is guided in the direction of the general shaft portion 7a of the shaft 7, and finally, the insertion opening 21 of the shim 20 is fitted to the general shaft portion 7a as shown in FIGS. 7 and 8. Note that, as described above, when the groove 23 is made to correspond to the gap A, the insertion end of the shaft 7 is connected to the bracket 8 that supports the end.
It is now supported by a. Incidentally, in this embodiment as well, a lock plate 11 is provided as shown in FIGS. 5, 7, and 9. The two are then fixed together by welding w.

Further, the bolt 30 attached to the lock plate 11 has a small diameter portion 32 formed at the base of the male threaded portion 31, and this small diameter portion 32 is loosely fitted into the mounting hole 11a of the lock plate 11. and by forming the mounting hole 1]a into a female thread having the same diameter as the male threaded portion 31, and by threadingly inserting the male threaded portion 31 into the mounting hole 11a, The small diameter portion 3 is located inside the mounting hole 11a.
2 can be installed in a state where it is prevented from coming off. Therefore, if the length 16 of the male threaded portion 31 is set so that the groove portion 23 of the shaft 7 corresponds to the gap A with the tip of the male threaded portion 31 in contact with the bracket 8, the shaft 7 can be easily aligned. After inserting the shim 20 into the groove 23,
By screwing the bolt 30 into the screw hole 33 formed in the bracket 8, the shaft 7 is moved in the insertion direction, and when the bolt 30 is completely tightened, the shaft 7 is inserted. It's about to be completed.
Although this embodiment discloses a shim mounting structure applied to a link mounting part of a small cargo handling vehicle, the present invention is not limited to this, and the present invention is applicable to a general coupling mechanism in which two members are coupled via a shaft. Of course, the shim mounting structure of the invention may also be applied. As explained above, in the mounting structure of the gap adjustment shim of the present invention, there is an insertion hole through which the shaft is inserted, and a notch on one side of the peripheral edge of the insertion hole has a width smaller than the shaft diameter to open the insertion hole. A shim formed with an open opening is inserted into a groove formed in a direction perpendicular to the axis of the shaft through the open opening, and the shim and the shaft are moved relative to each other in the axial direction to form a shim on one side of the groove. Since the shim is guided and attached to the general shaft part of the shaft along the tapered surface, there is no need to bend the shim or any other processing after inserting the shim into the shaft. This not only saves time and labor, but also eliminates the need for a working space for the processing, making it easier to work in a narrow installation space and increasing its applicability to a wider range.

In addition, since there is no need to bend the shim, the thickness of the shim can be set arbitrarily, and by forming this thickness in advance to match the gap between the shim parts, the number of shims to be installed can be reduced. It has an excellent effect of being able to achieve the desired results.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a configuration diagram showing an example of a connecting mechanism for attaching a shim, Figure 2 is a sectional view taken along the line ■-■ of Figure 1;
Figure 3 is a configuration diagram showing the conventional shim mounting structure, Figure 4A
, B is a front view of a shim and a sectional view of a shaft according to the shim mounting structure of the present invention, and FIGS. 5 to 9 are explanatory views showing the shim mounting structure of the present invention.

7...Shaft, 15, 20...Shim, 21...
Insertion port, 22... Opening port, 23... Groove, 24...
・Tapered surface.

Claims (1)

[Claims] 1. In a mounting structure for a gap adjustment shim that is attached to a shaft, the shim has an insertion hole that is inserted into the shaft, and a notch that is narrower than the shaft diameter on one side of the periphery of the insertion hole so that the insertion hole can be inserted into the shaft. a groove to which the opening of the shim is inserted in a direction perpendicular to the axis of the shaft; and a groove on one side of the groove that gradually slopes from the bottom of the groove toward the outer periphery of the shaft. A shim inserted into the groove and the shaft are moved relative to each other in a direction in which the shim moves in the direction of the tapered surface, and the inner periphery of the insertion hole is guided by the tapered surface while the general direction of the shaft is moved. A mounting structure for a gap adjustment shim, characterized in that it fits into a shaft portion.