JPH0724656Y2 - Idle wheel support device - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an improvement of a device for supporting an idle wheel of a crawler type suspension device.

[Prior art]

Crawler type undercarriage devices are used as undercarriage of construction machines such as hydraulic excavators and bulldozers. Here, the lower traveling body 40 of the hydraulic excavator shown as an example
As shown in FIG. 4 (a), the driving sprocket 46 for driving the track (track) 42 and the track 42.
The track frame 50 supports an idle wheel 47, which serves as a guide for traveling of the truck 42 while adjusting the tension of the truck 42. Incidentally, 48 is an upper roller, and 49 is a lower roller. This hydraulic excavator takes various postures during various operations and the loading load also changes, so the static or dynamic load changes in time series to change the center of gravity position, and as a result, it falls and restores. Moment balance works,
As shown in FIGS. 4 (a) and 4 (b), a part of the lower traveling body oscillates such as landing or jumping up. As shown in FIG. 5, the inclination θ of the vehicle body is attenuated at a frequency of about several Hz, but the external force P given by the initial maximum inclination angle θ ₁ is an impact load, and the track 42 on the ground contact side.
From the Idol Wheel 47. Here, the impact load in the front-rear direction is absorbed by the tension adjuster 24 shown in FIGS. 6 (a) and 6 (b). That is, the support of the idle wheel 47 in the front-back direction is performed by the hydraulic cylinder 35 fixed to the plate 36 of the track frame 50.
The yoke 33 is fixed to the rod of the, the angular bearing 32 that supports the shaft 30 of the idle wheel 47 at both ends is fixed to the tip of the yoke 33, and the truck tension can be adjusted by the forward and backward movement of the idle wheel 47. , A spring 34 that is fitted onto the hydraulic cylinder 35 and has its tip abutting against the yoke 33.
Since the above is provided, the impact load in the front-rear direction applied to the angular bearing 32 via the idle wheel 47 can be absorbed and buffered. On the other hand, the impact load P in the vertical direction is directly transmitted to the idler support 21, and is transmitted to the upper swing body 45 via the track frame 50 and the base frame which are connected to the idler support 21. That is, the idle wheel 47 is supported in the vertical direction as shown in FIGS. 6 (a), (b) and FIG.
In the idler support 21, a side member 29 that covers the side surface or the upper side of the idle wheel 47 is connected to the track frame 50 and the flange 22. The upper horizontal rib 27 is horizontally fixed via the rib 26, and the upper vertical rib 27 is also fixed.
A lower horizontal rib 28, which is parallel to and spaced apart from the upper horizontal rib 27, is fixed via a lower vertical rib 25 arranged on the extension line of 26 to form a reinforcing structure. An angular bearing 32 fixed to the shaft 30 of the idle wheel 47 is fitted in the gap between the upper lateral rib 27 and the lower lateral rib 28 so as to be slidable in the front-rear direction with substantially no gap in the vertical direction. . Therefore, as described above, the vertical impact load applied to the track side plate 37 to the track link 38 on the ground side is directly transmitted to the upper revolving structure 45 via the idler support 21 to give an uncomfortable feeling as the ride comfort of the operator. As a result, the life of the vehicle is adversely affected.

[Problems to be solved by the device]

The present invention was devised to solve the above-mentioned drawbacks, and its main problem is to provide a bearing portion between an idle wheel to which an impact load is transmitted and an upper support member supporting the bearing portion. There is a rubber body to absorb and reduce the impact load from the bottom to the top and to damp the vibration.

[Means for solving problems]

In order to achieve the above object, in the invention of claim 1, (a). In an idle wheel support device provided in a crawler type underbody device in which both ends of a rotary shaft of an idle wheel are supported by a pair of bearing members, and upper and lower surfaces of each bearing member are supported by a pair of support members, ). A columnar pressing piece is provided on the upper surface of the bearing member, and a cylindrical receiving body having a hole into which the pressing piece can be fitted is arranged between the pressing piece and an upper supporting member, and the cylindrical receiving piece is provided in the recess of the receiving body. The technical means is to provide a rubber body in the. Further, in the invention of claim 2, instead of the configuration of (b), (c). A columnar pressing piece is vertically provided on the upper support member, and a receiving body composed of a concave portion into which the pressing piece can be fitted is integrally formed on the upper surface of a bearing member facing the supporting member, and a rubber body is provided in the concave portion. The technical means of becoming

[Action]

The impact load transmitted from the ground contact side of the crawler belt to the idle wheel is transmitted to the bearing member of the idle wheel. A pressing piece is formed on the bearing member, and a receiving body in which a rubber body is interposed is fitted therein. Therefore, when an impact load is applied to the bearing member from the bottom to the top, the receiving member collides with the upper support member and acts as a buffer due to the spring action that compresses the rubber member, so that the impact load transmitted to the bearing member. Vibrations due to can be absorbed and reduced. Further, even if the upper support member is provided with a pressing piece and the bearing member is provided with a recessed portion in which rubber is fitted, the rubber body also buffers when the bumps are hit against each other.

【Example】

A preferred embodiment in which the idle wheel support structure according to the present invention is used in a hydraulic excavator will be described below with reference to the drawings. In this embodiment, the basic structure of the hydraulic excavator and the lower traveling body is substantially the same as that shown in FIG. 6, and the idler support portion 21 is connected to the base frame or the tractor frame supporting the upper revolving structure. ing. As shown in FIG. 1, the idler support portion 21 supports the support shaft 3 of the idle wheel 1 by angular bearings 2 and 2 illustrated as a pair of support members. That is, in the case of this embodiment, the idler support portion 21 includes a lower lateral support member 8 formed of a lateral rib supporting the lower side of the angular bearing 2 and an upper lateral side formed of a lateral rib constraining the upper side of the angular bearing 2. The supporting member 7 is provided so as to project from the side member 5 that covers the side surface of the idle wheel 1 and the upper end covers the upper side. Then, the upper lateral support member 7 and the lower lateral support member 8 each include an upper vertical reinforcing member 6A and a lower vertical reinforcing member 6B, which are vertical ribs and are arranged on the same line along the side surface of the idle wheel 1. And a projecting end of each of the side members 5 is connected to the reinforcing member. In the above configuration, in this embodiment, a gap is provided between the upper lateral support member 7 and the angular bearing 2 and the shock absorber 10 is formed. Here, the shock absorber 10 uses the elastic force of rubber, and in the case of this embodiment, as shown more clearly in FIG. 2, the cylindrical pressing piece 1 is projected on the upper surface of the angular bearing 2. Set up. A guide groove 18 is formed along the outer circumference of the pressing piece 11. A disk-shaped rubber body 17 having a diameter substantially the same as that of the pressing piece 11 is placed on one end of the pressing piece 11. The pressing piece 11 on which the rubber body 17 is placed is inserted into the concave hollow hole 16 of the cylindrical cap-shaped receiving body 15, and a slight gap S1 is provided in the radial direction as shown in FIG. It is fitted and holds the receiving body 15 in the hollow position. The receiving body 15 is formed in a horizontal plane in the illustrated example so that the upper surface thereof abuts the facing surface of the upper lateral support member 7. The lower edge of the peripheral wall of the receiving body 15 is provided with a gap S2 in the height direction in the guide groove 18 and the tip thereof is slidably fitted. The space between the receiving body 15 and the upper lateral support member 7 is the receiving body 15 described above.
Is set to an interval that does not drop from the pressing piece 11. Because of the above-mentioned configuration, during normal running when no load is applied from below to the track plate 9A to the track link 9B on the ground side of the undercarriage, the idle wheel 1 is lowered by its own weight, and the lower part of the angular bearing 2 is lowered. It abuts the lateral support member 8. Then, when the impact load P is generated and transmitted to the angular bearing 2, the rubber body 17 and the receiving body 15 are moved upward in conjunction with the pressing piece 11.
The upper surface of the receiving body 15 abuts the upper lateral support member 7. Next, the rubber body 17 is compressed by the protruding portion of the pressing piece 11. As a result, the inclination angle of the vehicle body shown in FIG. 5 can be reduced, and the vibration can be attenuated to reduce the force transmitted to the idler support portion 21. In this invention, the material of the receiving body is not particularly limited, and may be a metal material, a rubber material, or the like, and the rubber body and the receiving body are separately configured in the above embodiment, but they may be integrated. . In the case of a metal material, a rubber material may be fixed to the upper surface of the receiver. Further, in this invention, the pressing piece and the receiving body may be arranged upside down. That is, in the shock absorber 10 'shown in FIG. 3, a large-diameter concave hollow hole 16' is provided on the angular bearing 2 ', and a rubber body 17' is inserted into the hollow hole 16 '. On the other hand, on the upper lateral support member 7, a columnar pressing piece 11 'which can be inserted into the hollow hole 16' is hooked downward. Also by this, the impact load can be buffered by the elastic force of the rubber body 17 ', as in the above embodiment. In addition, it is needless to say that this buffer structure is not limited to the above-mentioned embodiment and can be variously modified in design.

[Effect of device]

In the present invention, since the rubber body is interposed between the bearing portions on both sides of the idle wheel to which the impact load is transmitted and the support member supporting the upper portion of the bearing portion, the elastic force of compression of the rubber body is generated. The shock load from the bottom to the top can be absorbed and reduced to reduce the vibration, and the tilt angle of the vehicle body as a response can be reduced. Therefore, the strength of the lower traveling body can be improved, and the riding comfort of the operator can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure for supporting an idle wheel according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the shock absorber, and FIG. FIGS. 4 (a) and 4 (b) are explanatory views showing the swing of the hydraulic excavator, FIG. 5 is a view showing the swinging phenomenon of the vehicle body, and FIG. 6 (a) is a support structure of the idle wheel in the front-rear direction. FIG. 6 (b) is a side view of the same, and FIG. 7 is a sectional view taken along line VII-VII of FIG. 6 (b). 1 …… Idle wheel 2 …… Square bearing 8 …… Lower lateral support member 7 …… Upper lateral support member 10 …… Cushioning device 11 …… Pressing piece 15 …… Receptor 17 …… Rubber body 18 …… Guide groove 21 …… Idler Support Department

Claims (3)

[Scope of utility model registration request] 1. An idle wheel support provided on a crawler type suspension device in which both ends of a rotary shaft of an idle wheel are supported by a pair of bearing members, and the upper and lower surfaces of each bearing member are supported by a pair of support members. In the device, a columnar pressing piece is provided on the upper surface of the bearing member, and a cylindrical receiving body having a hole into which the pressing piece can be fitted is disposed between the pressing piece and the upper supporting member. An idle wheel support structure characterized in that a rubber body is provided in the recess of the. 2. An idle wheel support provided on a crawler-type undercarriage device in which both ends of a rotary shaft of an idle wheel are supported by a pair of bearing members, and upper and lower surfaces of each bearing member are supported by a pair of support members. In the apparatus, a columnar pressing piece is vertically provided on an upper support member, and a receiving body composed of a recess into which the pressing piece can be fitted is integrally formed on an upper surface of a bearing member facing the supporting member, and a rubber is provided in the recess. Idle wheel support structure characterized by having a body. 3. A columnar pressing piece is provided on an upper surface of a bearing member, and a cylindrical receiving body having a hole into which the pressing piece can be fitted is arranged between the pressing piece and an upper supporting member. A groove is formed along the pressing piece on the upper surface of the bearing member that fits the rubber body in the recess of the receiver, and the peripheral wall of the receiver can be inserted from the lower edge side. The idle wheel supporting device according to 1 or 2.