JP4542026B2 - β pin mounting shaft shape - Google Patents

Description

The present invention relates to a shape of a β pin mounting shaft in which a β pin can be easily attached and detached.

For example, in a state where a shaft having a circular cross section and a member having a through hole are detachably fitted, the member having the through hole does not come out of the shaft, or conversely, the shaft passing through the through hole penetrates. As a means for preventing the pin from coming out of the hole, there is a well-known β pin as one of pins that are detachably inserted into a pin hole formed in a shaft (see, for example, Patent Document 1).

The β pin is formed in a substantially β shape by a spring wire, and when attached, the β-shaped ring-shaped head is held with fingers, and the straight portion is inserted from the tip side into the pin hole of the shaft. At this time, the β-shaped corrugated portion is pushed and spread by the outer peripheral portion of the shaft, and the β pin is held on the shaft by the corrugated portion and the spring force. To remove the β pin from the pin hole of the shaft, hook the fingertip on the ring-shaped part of the head and pull it out.
Japanese Patent Laying-Open No. 2003-95580 (FIG. 8)

The β pin mounting structure as described above has the following problems to be solved regarding the mounting and dismounting of the β pin, in particular, the removal.

FIG. 3, which is a side view of a wheel loader as a typical example of a work vehicle having an application example of a β pin, and a partial enlargement of a connecting bar as a member having a through hole that is secured to the wheel loader by a β pin and attached. This will be described with reference to FIG.

In the wheel loader generally indicated by numeral 2, a front vehicle body 6 and a rear vehicle body 8 each having a pair of left and right wheels 4 and 4 are connected to bendable about an axis 10 extending vertically in the middle in the front-rear direction. This is a refraction steering type vehicle. The front vehicle body 6 is provided with a work arm device 12 having a bucket 12 a, and the rear vehicle body 8 is provided with a cab 14 and an engine compartment 16.

The wheel loader 2 is provided with a connecting bar 18 that mechanically connects the front vehicle body 6 and the rear vehicle body 8 so that they are not inadvertently bent during transportation, storage, and repair and inspection of the airframe. Yes.

One end (the lower side in FIG. 3) of the connecting bar 18 is rotatably held by a pin 20 attached to the lower part of the side surface of the rear vehicle body 8, and the other end (the upper side in FIG. 3) connected to the front vehicle body 6. When not connected, as shown in FIG. 4, it is detachably attached to a pin 22 attached above the pin 20 of the rear vehicle body 8 by a β pin 24 inserted into a pin hole 22 a of the pin 22.

However, as can be easily understood from FIG. 4, a gap is not formed between the ring-shaped head 24 a of the β pin 24 and the connecting bar 18 so as to hook a finger on the head 24 a. It is difficult to pull out the β pin 24 from the pin 22 (in the direction of arrow Y) because the fingertip is not applied. This is particularly difficult when an operator wears gloves, and it is necessary to prepare a tool for pinching the head 24a or hooking it on the head 24a.

In order to improve this problem, for example, it is conceivable to provide a recess 19 (indicated by a two-dot chain line in FIG. 4A) in the connecting bar 18 to form a gap for hooking the fingertip. Causes a reduction in member strength and increases the manufacturing cost.

The present invention has been made in view of the above-mentioned facts, and its technical problem is to fit a shaft having a circular cross section and a member having a through hole so that the fitting member does not come out of the shaft, or conversely. Providing a shape of a β pin mounting shaft that allows easy attachment / detachment of a β pin that is detachably inserted as a stopper in a pin hole that is an insertion hole formed in the shaft so that the shaft does not come off the fitting member It is to be.

According to the present invention, a β-pin mounting shaft that solves the above technical problem includes an insertion hole for a β-pin that is formed to penetrate the end of the shaft having a circular cross section perpendicular to the axis, and the axis at the end of the shaft. A hemispherical surface formed by the radius of the shaft is provided , the center of the hemispherical surface is located at the intersection of the center line of the insertion hole and the axis line of the shaft, and the β pin hangs a finger when inserting into and removing from the insertion hole A substantially β-shape having a ring-shaped head (24a), a straight line portion (24b) that is inserted through the insertion hole, and a wavy portion (24c) that is pushed and spread by the outer periphery of the pin when inserted through the insertion hole. It is formed in a shape .

The β pin mounting shaft constructed in accordance with the present invention comprises a hemispherical surface formed by the radius of the shaft at the end of the shaft to which the β pin is mounted. Therefore, since the β pin can be easily rotated in the direction of the axis from the position perpendicular to the axis with the pin hole as the center, the fingertip is placed on the head of the β pin at the rotated position. Sufficient space can be prepared for hooking, and the β pin can be easily pulled out of the shaft.

Hereinafter, the shape of the β-pin mounting shaft configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating preferred embodiments.

In FIGS. 1 and 2, substantially the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals.

A description will be given with reference to FIG. A pin 23 having a circular cross-section, which is a shaft to which the β pin 24 is attached, is erected on the base 26, and a pin hole 23 a that is an insertion hole for the β pin 24 that is formed to penetrate the tip portion at right angles to the axis X 1 of the pin 23. And a hemispherical surface 23b formed by the radius R of the pin 23 about the axis X1. The center of the hemispherical surface 23b on the axis X1 is located at the intersection with the center line X2 of the pin hole 23a.

A connecting bar 18 as a fitting member having a through hole 18 a is fitted to the pin 23. The connecting bar 18 is secured by a β pin 24 so that it can be easily inserted into and removed from the pin 23.

The β pin 24 will be described with reference to FIG. The β pin 24 is formed of a spring wire in a substantially β shape, and when inserted into the pin hole, a ring-shaped head portion 24a that is hooked by a finger when inserted into and removed from the pin hole, a straight portion 24b that passes through the pin hole, and a pin hole. And a corrugated portion 24c which is pushed and spread by the outer peripheral portion of the pin.

Returning to FIG. 1, the description will be continued. When the β pin 24 is pulled out from the pin hole 23a of the pin 23 in order to remove the connecting bar 18 inserted through the pin 23, the β pin 24 is centered on the pin hole 23a, and the head 24a and the wavy portion 24c are shown in FIG. As indicated by an arrow Z in a), it is rotated in the direction of the axis X1 from a position orthogonal to the axis X1. Then, at this rotated position, as shown in FIG. 1 (c), using the space prepared around the head 24 a of the β pin 24, fingers are placed on the head 24 a and the β pin 24 is moved to the arrow. Pull out in the direction indicated by Y.

Conversely, when the β pin 24 is attached to the pin hole 23a of the pin 23, the β pin 24 may be attached at an arbitrary position rotated in the arrow Z direction during extraction.

Referring mainly to FIG. 1, the operation and effect of the shape of the β pin mounting shaft as described above will be described.

The pin 23 which is a β pin mounting shaft configured according to the present invention includes a hemispherical surface 23b formed with a radius R of the pin 23 at the shaft end to which the β pin 24 is mounted. Therefore, the β pin 24 can be easily rotated in the direction of the axis X1 from the position orthogonal to the axis X1 with the head 24a and the wavy portion 24c centered on the pin hole 23a. A sufficient space for hooking the fingertips on the heads 24 a of 24 can be prepared, and the β pin 24 can be easily pulled out from the pin 23.

Moreover, it is not necessary to provide a recess in the connecting bar 18 that is a fitting member in order to hang a fingertip. Therefore, there is no decrease in the strength of the fitting member and increase in manufacturing cost.

Further, by positioning the center of the hemispherical surface 23b at the intersection of the center line X2 of the pin hole 23a that is the insertion hole and the axis X1 of the pin 23, the β pin 24 can be rotated without difficulty along the hemispherical surface 23b. Can be attached and detached more easily.

The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various changes or modifications can be made within the scope of the present invention, for example, as described below. Is.

In the embodiment of the present invention, a configuration is shown in which a fitting member having a through hole is prevented from coming off by a β pin so that the fitting member does not come off from the shaft. Needless to say, the present invention can also be applied to the case where it is prevented from coming off by a β pin so as not to come out of the through hole.

It is a figure which shows the relationship between (beta) pin attachment axis | shaft comprised according to this invention, and (beta) pin, (a) is the figure which looked at the beta pin attachment state in the axial direction of the insertion hole of (beta) pin, (b) is (a) figure. The figure which looked at the arrow AA direction, (c) is the figure which looked at (a) figure in the arrow BB direction, (d) is the figure of the edge part of an axis | shaft. The figure which showed the beta pin in the single article state. The side view of the wheel loader which is a typical example of the work vehicle which has the example of application of (beta) pin. (A) is the elements on larger scale of the connection bar as a member which has the through-hole attached to the wheel loader of FIG. (B) is the figure which looked at (a) figure in CC arrow direction.

Explanation of symbols

23: Pin (axis)
23a: Pin hole (insertion hole)
23b: hemispherical surface 24: β pin R: radius X1: axis X2: center line

Claims (1)

A β-pin insertion hole formed through and perpendicular to the axis at the end of the shaft of the circular cross section;
The shaft end portion is provided with a hemispherical surface formed by the radius of the shaft around the axis ,
The center of the hemisphere is located at the intersection of the center line of the insertion hole and the axis of the axis;
The β-pin is expanded by the ring-shaped head (24a) to which a finger is put when inserting / removing into the insertion hole, the straight portion (24b) inserted through the insertion hole, and the outer periphery of the pin when inserted through the insertion hole. It is formed in a substantially β shape having a waved portion (24c) that is put on the outer periphery ,
The shape of the β pin mounting shaft.

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