JP7218894B2 - Shear bolt mounting structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shear bolt mounting structure, and more particularly to a shear bolt mounting structure that allows a shear bolt to be easily mounted to a rotating body such as a sprocket.

Conventionally, there is an overload prevention device using a shear bolt as an overload prevention device between a sprocket on the drive source side and a sprocket on the transmission side. As shown in FIG. 5, the overload prevention device using such a shear bolt includes a drive-side rotor 81 such as a sprocket on the drive-source side that rotates by a drive source such as an engine, and the drive-side rotor 81. and a transmission-side rotating body 82 such as a transmission-side sprocket provided coaxially with the transmission When a large load is applied to the side rotating body, the shear bolt 83 is broken to cut off the driving force from the engine or the like.

By the way, such a share bolt 83 is inserted into the through holes 81a and 82a in the outer peripheral surface of the driving side rotating body 81 and the transmission side rotating body 82, and the protruding tip side is fixed with a nut 84. ing. Therefore, if a sufficient space for mounting the nut 84 cannot be secured, a special tool must be prepared for working in the narrow space, and the cost of preparing the special tool and the nut There was a problem that it took time to attach 84.

In response to this, a method has been proposed in which the head of the share bolt is covered with an elastic member to maintain the inserted state without fixing the share bolt with a nut (Patent Document 1).

In such a device, as shown in FIG. 6, a rotatable lever 91 is provided on the outer peripheral portion of the sprocket, and by rotating the lever 91, the head 92 of the shear bolt is pressed so as to cover it. , to prevent the shear bolt from coming off.

JP-A-2001-193032

However, with such a configuration, if the rotating body such as the sprocket is small, a sufficient space for mounting the rotating lever 91 cannot be secured. Therefore, there is a problem that the sprocket must inevitably be enlarged. In addition, when the shear bolts are attached to a plurality of locations, it is necessary to attach the rotating levers 91 corresponding to the attachment locations, which poses a problem that a larger space is required. Furthermore, when such a rotating lever 91 is attached to the outer peripheral surface, the center of gravity of the rotating body deviates greatly from the center of rotation, which may cause vibration and noise.

Therefore, in order to solve the above problems, the present invention enables a shear bolt to be easily attached even when the area of a rotating body such as a sprocket is small, and even when the shear bolt is attached to a plurality of locations. It is an object of the present invention to provide a shear bolt mounting structure capable of pressing the head of the shear bolt with a single pressing member and further preventing vibration and noise during rotation as much as possible. do.

That is, in order to solve the above problems, the present invention provides a drive-side rotating body and a transmission-side rotating body provided on the same axis, and a through hole provided on the same radius of the driving-side rotating body and the transmission-side rotating body. A hole, a share bolt inserted across the through-hole of the drive-side rotor and the through-hole of the transmission-side rotor, and the share bolt are rotatably provided on the same axis to press the head of the share bolt. and a pressing member , wherein the pressing member is provided so as to extend outside the recess with respect to the recess for covering the head of the share bolt, and the transmission A lever spaced apart from the surface of the transmission-side rotating body so that a finger can be inserted between it and the surface of the side rotating body, and an opening provided at the center of the recess are provided .

According to the present invention, since the pressing member is provided on the same axis as the rotating shaft of the drive-side rotating body to press the head of the shear bolt, even if the area of the outer peripheral surface is small, the pressing member can be pressed. By rotating the member, the head of the shear bolt can be pressed. Further, if the through holes are provided on the outer peripheral surface on the same diameter, it is possible to press the head of the shear bolt inserted at another position with one pressing member. Furthermore, since the pressing member is provided on the same axis as the drive-side rotor, the center of gravity of the drive-side rotor does not deviate greatly from the rotation axis, and vibration during rotation is eliminated.

The figure which shows the attachment structure of the shear bolt in one embodiment of this invention. A diagram showing the mounting structure of the shear bolt in the same form Diagram showing a shear bolt in the same configuration The figure which shows the pressing member in other embodiment Diagram showing the mounting structure of a shear bolt in a conventional example Diagram showing the mounting structure of a shear bolt in a conventional example

An embodiment of the present invention will be described below with reference to the drawings.

The mounting structure of the share bolt 4 in this embodiment is such that the force transmitted from the drive source such as the engine is transmitted to other moving parts via the sprocket, and a large load is applied to the moving parts. When this occurs, the shear bolt 4 attached to the sprocket is broken to cut off the power. Characteristically, as shown in FIGS. 1 and 2, the shear bolt 4 is provided across the driving side rotating body 1 and the transmission side rotating body 2 provided on the same rotating shaft 3. A pressing member 5 is rotatably provided on the rotating shaft 3, and by rotating the pressing member 5, the head portion 41 of the shear bolt 4 is pressed by the pressing portion 51. The share bolt 4 can be fixed without attaching a nut. The present embodiment will be described in detail below.

First, the drive-side rotating body 1 is rotated by the driving force from the engine, and is constituted by a sprocket rotated by a chain here. Here, a sprocket will be described as an example, but it may be configured by a gear rotated by a gear, a pulley rotated by a belt, or the like. This drive-side rotating body 1 rotates about a rotating shaft 3, and transmits force to another transmitting-side rotating body 2 provided on this rotating shaft 3 via a shear bolt 4. It is designed to let

This transmission-side rotating body 2 is for transmitting driving force to other moving parts, and here, it is composed of a sprocket that transmits the driving force by a chain. In this embodiment, a sprocket is described as an example of the transmission-side rotating body 2, but similarly, it may be configured by a gear rotated by a gear, a pulley rotated by a belt, or a flange. It is also possible to rotate the rotating shaft 3 via the share bolt 4 in a shape.

Through holes 11 and 21 through which the shear bolts 4 pass are provided on the outer peripheral surfaces of the drive-side rotor 1 and the transmission-side rotor 2 . The through holes 11 and 21 have substantially the same diameter as the share bolt 4, and are provided with a gap width as small as possible in order to eliminate looseness during rotation. However, even if the width of the gap is reduced in this way, when the driving force is transmitted to the transmission-side rotating body 2 via the share bolt 4, the inner diameters of the through holes 11 and 21 widen with use, and rattling occurs. cause it to occur. Therefore, here, through holes 11 and 21 are provided at a plurality of locations, and when the through holes 11 and 21 are widened, the share bolts 4 can be attached to the other through holes 11 and 21 for use. . The through holes 11 and 21 are provided at positions having the same diameter from the center of rotation of the rotary shaft 3, and the pressing member 5, which will be described later, is rotated to press the head portion 41 of the shear bolt 4. Let it be.

As shown in FIG. 3, the shear bolt 4 inserted into the through holes 11 and 21 has a head portion 41 and a shaft portion 42 having a diameter corresponding to the breaking force. It is composed of a hexagonal bolt, a pin having a circular head 41, or the like. The shaft portion 42 may be provided with a small-diameter portion or a notch portion corresponding to the breaking force, or may be cylindrical with the same diameter.

Based on such a configuration, in this embodiment, the pressing member 5 that presses the head portion 41 of the shear bolt 4 is provided. The pressing member 5 is provided on the rotating shaft 3 and presses the head portion 41 of the share bolt 4 by a pressing portion 51 provided on the outer peripheral portion thereof.

The pressing member 5 is strongly pressed toward the surface side of the transmission-side rotating body 2 by an elastic body such as a spring 31 provided between the pressing member 5 and the flange portion 32 of the rotating shaft 3 . Although the pressing member 5 is provided on the surface side of the transmission-side rotating body 2 here, the transmission-side rotating body 2 and the driving-side rotating body 1 are reversed, and the pressing member is provided on the surface side of the driving-side rotating body 1 . 5 may be provided. A pressing portion 51 for pressing the head portion 41 of the share bolt 4 is provided on the outer peripheral portion of the pressing member 5 , and the head portion 41 of the share bolt 4 is covered with a concave portion 52 provided therein. It is designed to be pressed by The recess 52 prevents the pressing member 5 from rotating and allows the head portion 41 of the share bolt 4 to be fixed, and has a depth dimension shallower than the head portion 41 of the share bolt 4. ing. By making such a depth dimension, the shear bolt 4 can be pressed by the spring 31 . When the share bolt 4 is covered with the pressing portion 51 in this way, the share bolt 4 is hidden, and it becomes impossible to confirm whether or not the share bolt 4 is attached. Therefore, here, an opening 53 is provided at the center of the recess 52 so that it can be confirmed whether or not the shear bolt 4 is attached.

A lever 54 for operating the pressing member 5 is provided outside the pressing portion 51 . This lever 54 forms a gap between the surface of the transmission-side rotating body 2 and the surface of the transmission-side rotating body 2 for inserting a finger. A gap is formed, and in that state, the pressing member 5 can be rotated.

Next, the operation of the mounting structure for the shear bolt 4 configured in this way will be described.

First, when the share bolt 4 is attached, the through holes 11 and 21 of the drive side rotor 1 and the transmission side rotor 2 are aligned, and the share bolt 4 is inserted in that state. At this time, the pressing portion 51 of the pressing member 5 is displaced from the positions of the through holes 11 and 21 , and the shear bolt 4 is inserted into the through holes 11 and 21 .

After inserting the shear bolt 4 in this manner, the lever 54 of the pressing member 5 is pulled forward to form a gap into which the head 41 of the shear bolt 4 can be inserted against the pressing force of the spring 31 .

In this state, the lever 54 of the pressing member 5 is rotated to a position where the recessed portion 52 of the pressing portion 51 engages the head portion 41 of the share bolt 4 . Then, while viewing the opening 53 of the recess 52 , the lever 54 is released with the head 41 of the shear bolt 4 at the center position of the recess 52 .

When the lever 54 is released in this manner, the pressing member 5 is pressed toward the surface side by the pressing force of the spring 31 provided on the rotating shaft 3, so that the head portion 41 of the share bolt 4 can be pressed.

Thereby, the share bolt 4 can be fixed without attaching a nut to the share bolt 4.例文帳に追加

Thus, according to the above-described embodiment, the drive-side rotor 1 and the transmission-side rotor 2 are provided on the same axis, and the drive-side rotor 1 and the transmission-side rotor 2 are provided on the same radius. The through holes 11 and 12 and the share bolt 4 inserted across the through hole 11 of the driving side rotating body 1 and the through hole 21 of the transmitting side rotating body 2 are rotatably provided on the same axis. , and a pressing member 5 for pressing the head portion 41 of the share bolt 4, wherein the pressing member 5 is provided with a concave portion 52 for covering the head portion 41 of the share bolt 4; a lever 54 that extends outside the concave portion 52 with respect to the same axis and is spaced apart from the surface of the transmission-side rotating body 2 so that a finger can be inserted between the lever 54 and the surface of the transmission-side rotating body 2; Since the opening 53 provided at the center of the recess 52 is provided, even if the area of the outer peripheral surface of the drive-side rotating body 1 or the like is small, the pressing member 5 can be rotated and shared. The head 41 of the bolt 4 can be pressed. Further, by providing the through holes 11 and 21 on the outer peripheral surface with the same diameter, it is possible to press the head portion 41 of the shear bolt 4 inserted at another position with one pressing member 5 . Furthermore, since the pressing member 5 is provided on the same axis as the driving-side rotating body 1, the center of gravity of the driving-side rotating body 1 and the like does not deviate greatly from the rotation shaft 3.

It should be noted that the present invention is not limited to the above embodiments, and can be implemented in various modes.

For example, in the above-described embodiment, the pressing member 5 is provided with the pressing portion 51 at one location to fix the shear bolt 4. However, as shown in FIG. , a plurality of shear bolts 4 may be attached at the same time. The plurality of pressing portions 51 may press the heads 41 of all the share bolts 4 at the same time. When the shear bolts 4 are attached and pressed at a plurality of locations in this way, when the pressing member 5 is pulled forward and rotated, a gap must be formed in which the heads 41 of all the shear bolts 4 can be inserted at the same time. will not be. Therefore, it is preferable to provide the levers 54 at symmetrical positions with respect to the rotation shaft 3 so that the pressing member 5 can be pulled up horizontally. If the levers 54 are provided at such positions, by pulling the respective levers 54, the pressing member 5 can be pulled up while being horizontal, and the head 41 of the shear bolt 4 can be fitted at the same time. will be able to Further, by providing the pressing portion 51 and the lever 54 at such symmetrical positions, the center of gravity of the pressing member 5 coincides with the rotation shaft 3, and there is also the advantage that vibration during rotation can be prevented. .

Further, in the above embodiment, the through holes 11 and 21 are provided at a plurality of locations on the same radius of the rotor so that the shear bolt 4 can be inserted. A bolt 4 may be attached. At this time, the pressing member 5 is also provided with a pressing portion 51 corresponding to each diameter so that the share bolt 4 can be pressed. With this configuration, even if the same share bolt 4 is used, it is possible to change the state of the load at which the shear bolt 4 can be broken by inserting it in positions with different diameters.

Furthermore , in the above-described embodiment, when the pressing member 5 is pressed, the spring 31 is provided on the rotating shaft 3 to press the pressing member 5. Alternatively, rubber may be used to press the pressing member 5. .

In the above-described embodiment, the lever 54 is pulled forward to fit the head portion 41, but the inclined portion for smoothly guiding the head portion 41 of the share bolt 4 to the side portion of the pressing portion 51 is provided. may be formed, and the head 41 may be fitted into the position of the recess 52 by rotating the pressing member 5 while the head 41 is in contact with the inclined portion.

Further, in the above-described embodiment, the transmission-side rotating body 2 is rotated to transmit the force to other operating parts by means of a chain (not shown). It may be rotated, and the driving force from the drive-side rotating body 1 may be transmitted to the rotating shaft 3 side via the transmission-side rotating body 2 to rotate.

INDUSTRIAL APPLICABILITY The present invention can be used, for example, in power machines such as agricultural machines, snow throwers, civil engineering machines and construction machines.

REFERENCE SIGNS LIST 1 Drive-side rotating bodies 11, 21 Through hole 2 Transmission-side rotating body 21 Through hole 3 Rotating shaft 31 Spring 32 Flange 4 Share bolt 41 Head 42 Shaft 5 Pressing member 51 Pressing portion 52 Recess 53 Opening 54 Lever

Claims (1)

a drive-side rotating body and a transmission-side rotating body provided on the same axis;
a through hole provided on the same radius of the drive-side rotor and the transmission-side rotor;
a shear bolt inserted across the through-hole of the drive-side rotor and the through-hole of the transmission-side rotor;
a pressing member that is rotatably provided on the same axis and presses the head portion of the shear bolt;
In a shear bolt mounting structure comprising
the pressing member,
a recess for covering the head of the shear bolt;
a lever that extends outside the concave portion with respect to the same shaft and is spaced apart from the surface of the transmission-side rotating body so that a finger can be inserted between the lever and the surface of the transmission-side rotating body;
an opening provided in the center of the recess;
A shear bolt mounting structure characterized in that a

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