JPH0592074U - Tracked tractor suspension - Google Patents

Abstract

(57) [Abstract] [Purpose] In a suspension system for a track-type tractor equipped with an equalizer bar, to prevent interference between a track link and a wheel brim when traveling on an uneven terrain. [Structure] Joint shafts 20 each having a spherical surface portion 21 are mounted via spherical bearings 12 at both ends of an equalizer bar 10 which is pivotally mounted on a main frame 2 by a center pin 11. The spherical portion 2 is attached to one of the two split brackets 22 and 23 of the pair of brackets that are fastened to the track frame 4 with bolts 26.
1 is pivotally attached, and the other end of the joint shaft 20 is loosely fitted in the hole 27 of the other bracket 24, 25. A gap 28 is provided between the hole 27 and the joint shaft 20. Further, the axis of the joint shaft 20 and the center line of the track frame 4 are aligned. When the equalizer bar is swung, even if the center position of the spherical bearing 12 is closer to the center of the vehicle body, the alignment of the track frame 4 does not get out of order because of the gap 28. Further, since the truck frame 4 does not generate a rotational moment about the joint shaft 20 due to the vehicle body load, the crawler belt link does not interfere with the wheel brim.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a suspension device that connects a main frame and a track frame of a track-type tractor.

[0002]

[Prior Art]

 As shown in FIG. 5, a suspension system for a track-type tractor has a track frame 4 swingably mounted on a pivot shaft 3 fixed to a main frame 2 of a tractor 1, and a track frame 4 mounted on a track frame 4. The wheel 30, the upper wheel 32, and the guide wheel 7 guide the crawler belt 34. The starting wheel 6 is fixed to the starting wheel shaft 5 arranged at a position different from the pivot shaft 3, and transmits power to the crawler belt 34.

As shown in FIG. 6 which is an arrow view of FIG. 5, the equalizer bar 10 is pivotally attached to the main frame 2 by a center pin 11 at its center, and both ends are attached to the track frame 4 by side pins 37. It is pivotally attached to the fixed bracket 36.

When the tractor 1 is on a flat ground, a gap s is provided on both sides between the side surface of the link 35 of the crawler belt 34 and the brim 31 of the lower wheel 30, so that the link 35 and the upper wheel are rotated. A gap s is also provided on both sides with the collar 33 of the wheel 32 so that the link 35 does not interfere with the collars 31 and 33 of the wheel.

When the track frame 4 receives an external force from the lateral direction, the equalizer bar 10 may be misaligned by the guide wheel 7 side being brought closer to the center of the vehicle body (toe-in) or opened outward (toe-out). To prevent.

When the tractor 1 travels on an uneven terrain, for example, when overcoming an obstacle with a track on one side, the track frame 4 moves along the terrain along the pivot axis 3 as indicated by the chain double-dashed line in FIG. It swings up and down around the center to reduce the shaking of the car body.

[0007]

[Problems to be solved by the device]

 However, since the equalizer bar 10 is pivotally attached to the main frame 2 and the track frame 4 by a pin, when the equalizer bar 10 swings around the center pin 11 as shown in FIG. 6, it is connected to the track frame 4. The center of the side pin 37 is approaching the center of the vehicle body by e.

That is, since the toe-in is added, the alignment is misaligned, and as shown in FIG. 7, the collar 31 of the lower roller 30 and the link 35 are the E portion, and the collar 33 of the upper roller 32 and the link 33 are linked. The F portion interferes with 35, and causes early wear, cracks, or loss of the link or the collar. Such a situation occurs when the tractor gets over an obstacle with one track.

Further, as shown in FIG. 8, the center of the track frame 4 and the center of the side pin 37 are deviated from each other by L. Therefore, when the sprung load 2P is applied to the center pin 11 of the track frame 4, the crawler belt 34 A rotational moment M is generated around the side pin 37 as a center by the reaction force P applied to the center of the wheel, and the flange 31 of the lower wheel 30 and the link 35 are G portions, and the flange 33 of the upper wheel 32 and the link 35 are It interferes in the F section. Such a state mainly occurs when overcoming an obstacle.

The present invention has been made in view of the above problems, and a track-type tractor that does not cause an alignment error or a rotation moment in a track frame even when traveling on an uneven terrain. The purpose is to provide a suspension system.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the first idea of the suspension device for a track-type tractor according to the present invention, an equalizer bar is swingably attached to the main frame of the tractor and has both ends connected to the left and right track frames. In a suspension device for a crawler belt type tractor equipped with, a joint shaft having a spherical portion at one end is swingably attached to both ends of the equalizer bar via spherical bearings so that the shaft center is parallel to the track frame, The spherical portion of the joint shaft is pivotally mounted on one of a pair of brackets to be mounted on the track frame, and the other end of the joint shaft is loosely fitted to the other bracket, and the joint shaft is swung by the equalizer bar. Is provided with a hole that allows movement of the movable range of the other end of the joint shaft when the joint shaft is moved. It is characterized by causing disposed on the center line of the click frame.

[0012]

[Action]

 According to the above configuration, the joint shaft having the spherical portion at one end is mounted on both ends of the equalizer bar through the spherical bearing, and the spherical portion of the joint shaft is pivotally attached to one of the pair of brackets of the track frame and the other end of the bracket is attached. Since the bracket has a hole that allows the other end of the joint shaft to move within the movable range, the track frame swings up and down, and the equalizer bar swings, causing toe-in even if the center position of the spherical bearing shifts. There is no.

Further, since the joint shaft is arranged on the center line of the track frame, no rotational moment is generated in the track frame due to the vertical load.

[0014]

【Example】

 An embodiment of a suspension system for a track-type tractor according to the present invention will be described in detail below with reference to the drawings. 1 is a plan view of a connecting portion between an equalizer bar and a track frame, FIG. 2 is a side view, which is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a front view, which is a sectional view taken along the line BB in FIG. FIG. 4 is a detailed view of the joint shaft, and is a cross-sectional view taken along line CC of FIG. 2.

As shown in FIGS. 1, 2 and 3, a joint shaft 20 having a spherical surface portion 21 is provided at both ends of an equalizer bar 10, which is pivotally attached to a main frame 2 by a center pin 11 so as to swing. A spherical bearing 12 is swingably mounted so that the core is parallel to the track frame 4.

The spherical portion 21 formed at one end of the joint shaft 20 is pivotally attached to one of the two brackets 22 and 23 of the pair of brackets mounted on the track frame 2 via the spherical bush 13, and 22 and 23 are fastened to the main frame 2 with bolts 26.

The other end of the joint shaft 20 is loosely fitted in a hole 27 provided in the other half bracket 24, 25 which is fastened to the main frame 2 by a bolt 26. As shown in FIG. 4, the hole 27 is larger than the shaft diameter of the joint shaft 20 and has a gap 28. In the standard state, the axis of the joint shaft 20 is arranged so as to coincide with the center line of the track frame 4.

Reference numeral 14 is a guide wheel bracket that holds the guide wheel 36, and 15 is a rod that holds the guide wheel bracket 14.

Next, the operation will be described. When the tractor travels on uneven terrain such as overcoming on one side, the equalizer bar 10 swings around the center pin 11, and the center of the spherical bearing 12 approaches the center of the vehicle body. In that case, as shown in FIG. 4, the joint shaft 20 swings about the spherical surface portion 21 and moves within the gap 28 as indicated by a chain double-dashed line. Therefore, the truck frame is not centered on the vehicle body.

Further, since the axis of the joint shaft 20 is on the center line of the track frame 4, no rotational moment is generated in the track frame due to the upward reaction force of the crawler belt.

[0021]

[Effect of the device]

 As described in detail above, the present invention is an equalizer bar type suspension device for a track type tractor, in which both ends of the equalizer bar are equipped with joint shafts having spherical portions at one end in parallel with the track frame via spherical bearings. , The spherical portion of the joint shaft is pivotally attached to one of a pair of brackets mounted on the track frame, and the other bracket has a movable range of the joint shaft when the equalizer bar swings and the joint shaft is moved. Since the joint shaft is loosely fitted with holes to allow movement, the truck frame will not be centered on the vehicle body even if the equalizer bar sways when the tractor travels on rough terrain. Therefore, there is no interference between the track links and the roller collars due to misalignment, and there is no risk of wear or damage to the links or roller collars.

Further, since the axis of the joint shaft is made to coincide with the center line of the track frame, no rotational moment is generated in the track frame, and therefore the crawler belt link and the wheel brim do not interfere with each other. .

[Brief description of drawings]

FIG. 1 is a plan view of a suspension device according to the present invention.

FIG. 2 is a side view of the suspension device of the present invention.

FIG. 3 is a front view of the suspension device of the present invention.

FIG. 4 is a detailed view of a joint shaft portion of the suspension device of the present invention.

FIG. 5 is a side view of a crawler type tractor.

FIG. 6 is a front view of a conventional suspension device.

FIG. 7 is an explanatory view showing a state of interference between a crawler belt link and a wheel brim when a conventional suspension device travels on an uneven terrain.

FIG. 8 is an explanatory view showing an interference state between a crawler belt link and a wheel brim due to a rotation moment generated in a track frame of a conventional suspension device.

[Explanation of symbols]

 2 Main frame 4 Track frame 10 Equalizer bar 11 Center pin 12 Spherical bearing 14 Guide wheel bracket 20 Joint shaft 21 Spherical part 22, 23, 24, 25 Bracket 26 Bolt 27 Hole 28 Gap

Claims (2)

[Scope of utility model registration request] 1. A suspension system for a track-type tractor, which is pivotally mounted on a main frame of a tractor and has an equalizer bar for connecting both ends to left and right track frames, wherein a joint shaft having a spherical portion at one end is provided. Both ends of the equalizer bar are swingably mounted via spherical bearings so that the shaft center is parallel to the track frame, and the spherical part of the joint shaft is pivotally attached to one of a pair of brackets to be mounted on the track frame. Then, the other end of the joint shaft is loosely fitted to the other bracket, and when the joint shaft is moved by the swing of the equalizer bar, a hole that allows movement of the other end of the joint shaft in the movable range. A suspension device for a track-type tractor, which is characterized in that: 2. The suspension system for a track-type tractor according to claim 1, wherein the joint shaft is arranged on a center line of the track frame.