JPS5919662Y2 - Tracked vehicle suspension equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to a suspension system for a cut-roller type tracked vehicle in which each link of the crawler track is provided with a roller. The objective is to prevent vibration, improve traction performance and ride comfort, and improve the durability of the suspension itself.

This invention will be described in detail below with reference to an illustrated embodiment.

In the figure, reference numeral 1 indicates the suspension body of a tracked vehicle such as a construction machine, and a truck frame 2 is provided on both sides of the lower part of the vehicle body (not shown). A front rail 4 biased forward is provided.

The front rail 4 has an annular shape, and its center part is fixed non-rotatably to a support member 5 which is attached to the front part of the track frame 2 so as to be movable in the front and back direction.
The biasing mechanism 3 is installed behind the support member 5,
The front rail 4 is urged forward via the support member 5.

Furthermore, a carrier rail 6 and a track rail 8 are provided above and below the track frame 2 in parallel thereto.

The carrier rail 6 has a structure in which two rail members 6a each having a substantially T-shaped cross section are provided in parallel with an interval in the lateral direction.
The front and rear ends of each tread surface 6b are curved so that the tip side becomes lower in sequence on both sides of the front rail 4 and the sprocket 12, which will be described later.

The front curved portion 6C is for moving the crawler roller 13a, which has been rolling on the tread surface 6b of the carrier rail 6, onto the front rail 4 without impact, and conversely from the front rail 4 to the carrier rail 6. It is.

Further, the rear curved portion 6d swings when the crawler roller 13a moves from the carrier rail 6 to the sprocket 12 when the vehicle is moving backward, and the crawler roller 13a moves toward the sprocket 12.
As shown in FIG. 8, the track roller 13a is supported by the curved portion 6d until just before the track roller 13a engages with the sprocket 12, and the track roller 13a swings. The radius of curvature R of the curved portion 6d is set so that the track roller 13a completely separates from the curved portion 6d at the position where it engages with the sprocket 12.

Further, the carrier rail 6 is supported at multiple locations by elastic support portions 7.

The elastic support part 7 has an adjustment member 7a that can be freely adjusted in height by spring adjustment or injection of grease, and is provided upright from the top surface of the track frame 2, and a bushing 7b made of an elastic material such as rubber is provided at the top end. As shown in FIG. 6, the other end of a pin 7C whose one end is fixed to the lower part of the carrier rail 6 is inserted through the bush 7b, so that each carrier rail 6 is elastically supported.

As a result, the crawler roller 13a transferred and supported by the carrier rail 6 during backward movement is smoothly engaged with the sprocket 12, so that no collision noise is emitted, and the crawler roller 13a
Wear caused by relative slippage between a and the sprocket 12 can be prevented.

On the other hand, the track rail 8 is fixed to the lower surface of the track frame 2 via a plurality of fixing brackets 9 provided at intervals in the front-rear direction at the lower part of the track frame 2.

The track rail 8 also has a tread surface 8a on the lower surface having the same width as the carrier rail 6, and is configured such that the track roller 13a rolls on these tread surfaces 8a.
Protrusions 8 are provided downwardly on the mutually opposing portions of each tread 8a.
b are provided protrudingly, and these protrusions 8b allow each crawler roller 13
a is guided to move along the tread surface 8a of the track rail 8.

Further, the front and rear ends of each track rail 8 are curved diagonally upward.

Among these curved portions 8C58d, the curved portion 8C, which curves below the front rail 4, is such that the thrusting force when overcoming an obstacle such as a rock while driving is directly applied to the front rail 4.
The curvature R is determined so that the crawler roller 13a that has left the front rail 4 comes into contact with the curved portion 8C without impact (see Fig. 4). On both sides of the rear, both ends are track rollers 13.
An under guard 10 that bends in both directions of a is fixed.

The above-mentioned under guard 10 is also provided at approximately the middle and rear of the track rail 8, and the rear curved portion 8d of the track rail 8 is configured as follows.

That is, sprockets 12 are provided at the rear of the track frame 2 and are fixed to both ends of a final reduction shaft 11 that projects from both sides of the rear of the vehicle body (not shown).

This sprocket 12 has semicircular recesses 12a provided on its circumference at equal intervals in the circumferential direction into which the small-diameter body 13□ of the track roller 13a fits, and these recesses 12a
The pitch is set to be equal to the pitch IP between each crawler roll 13a of the crawler 13 wound between the sprocket 12 and the front rail 4.

As shown in FIG. 9, the crawler track 13 is made up of a large number of links 13b connected endlessly by pins 13C, and each link 1
A track board 13d is fixed to the outer surface of 3b, and
The crawler roller 13a is rotatably supported on the outer periphery of a bush 13e fitted into the pin 13C.

The crawler roller 13a has a small diameter trunk 1 as shown in FIG.
3, a large diameter roller portion 133 having treads 13□ at both ends;
Floating seals 14 are provided for each crawler roller 13a between both ends and each link 13b to seal the oil sealed in the pin 13C and at the same time to prevent earth and sand from entering the sliding part. A dust seal 13 as shown in FIG. 11 is provided between the end face of each bush 13e and the outer end of the link 13b.
f and thrust ring 13g.

The thrust ring 13g is located between the end face of the bush 13e and the link 13b and supports the load in the thrust direction, and the dust seal 13f is provided on the link 13C so as to surround the thrust ring 13g. It is accommodated in the counterbore 13h, and the seal portion 13i makes sliding contact with the side surface of the other link 13C to prevent dirt and the like from entering between the links 13C.

As a result, l can be made smaller compared to the conventional thrust ring 13g and dust seal 13f arranged side by side, and the fitting part of the link 13C (indicated by XXX) can be made larger, which reduces the looseness of the entire link 13C. As the bottle 13b becomes smaller and has improved durability, the bending strength of the bottle 13b itself is also improved.

On the other hand, the crawler roller 13a rolling along the lower surface of the track rail 8 needs to be smoothly transferred to the sprocket 12 at the rear.

In order to transfer the crawler roller 13a smoothly and efficiently, the rear end of the track rail 8 is curved in the following manner in the embodiment of this invention.

That is, if the center of the sprocket 13 is now O,
Crawler roller 1 located slightly forward of this center O
3a is still on the track rail 8 and is supported by the track rail 8, as shown in FIG.

The orbital center 01 of the crawler roller 13a is set forward of the center of the sprocket 12, and the intersection of the trajectory of the center of the crawler roller 13a centered on this center 01 and the pitch circle PCD of the sprocket 12 is defined as a. The rear end of the track rail 8 is curved so that the crawler roller 13a is slightly separated from the track rail 8 at the intersection a and completely meshes with the sprocket 12.

Note that if the crawler roller 13a is far away from the track rail 8 at this position, it will cause vibrations and noise, so it is desirable to set it so that it is slightly far away. and crawler roller 1 located one pitch behind it.
3 The positional relationship between a and the track rail 8 is determined.

Next, the radius of curvature of the curved portion 8d of the track rail 8 is determined by how smoothly the crawler roller 13a is moved between them.

That is, if the point b is approximately % of the pitch between each crawler roller 138, this point and the orbit center 01 of the crawler roller 13a
Set a straight line R2' that connects the
Set 2.

Then, a circle with a radius R1 is drawn around this center 02, and the rear end of the track rail 8 is curved along this circle to form a curved portion 8d.
Crawler roller 13 located slightly forward of the center O of 2
The determination is made taking into consideration that a moves backward one pitch until it slightly leaves the track rail 8 without causing any vibration or the like.

As a result, the crawler roller 13a, which has reached just below the center of the sprocket 12, gradually approaches the concave portion 12a of the sprocket 12 while still rolling on the tread surface 8a of the curved portion 8d, and the trajectory of the crawler roller 13a and the sprocket 12 At the point where the pitch circle PCD of the recess 12a intersects, the trunk 13□ of the crawler roller 13a comes to mesh with the recess 12a of the sprocket 12, and the crawler roller 13d completely leaves the road surface. 13a meshes with the sprocket 12, no external force is applied from below to the final reduction shaft 11 of the sprocket 12, and at the position where the crawler roller 13a leaves the curved portion 8d, the trunk 13
Since □ meshes with the recess 12a, there is no relative slippage between the trunk 13 and the recess 12a due to the freely rotatable crawler roller 13a. Wear can be prevented.

As detailed above, this idea is based on the fact that the rear end of the track rail provided on the underside of the track frame is curved so that the track roller and track rail are separated just before the track roller engages with the sprocket. Since no external force is applied directly to the sprocket from below the sprocket, and only rotational torque acts on the final reduction shaft, the durability of the sprocket and final reduction mechanism will be quickly damaged due to excessive external force. In addition, when the crawler roller engages with the sprocket, it does not collide with the sprocket and generate noise.

Furthermore, since the crawler rollers are allowed to rotate freely when they engage with the sprocket, it is possible to prevent the possibility of relative slippage between the two and premature wear.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, with Figure 1 being an overall side view, Figure 2 being a partially cutaway front view with the tracks omitted,
Figure 3 is a sectional view taken along the line III-III in Figure 1, Figure 4 is an enlarged explanatory view of the front rail section, Figure 5 is an enlarged explanatory view of the sprocket section, and Figure 6 is a cross-sectional view taken along the line VI-VI in Figure 5. 7 is an explanatory diagram of the action when the sprocket and crawler roller engage from below, FIG. 8 is an explanatory diagram of the action when the sprocket and crawler roller engage from above, FIG. 9 is a side view of the crawler track, and FIG. 10 11 is a partially cutaway plan view of the same portion, and FIG. 11 is an enlarged sectional view of the dust seal portion. 2 is a track frame, 4 is a front rail, 8 is a track rail, 12 is a sprocket, 13 is a track, 13
a is a crawler roller, 13b is a link.

Claims (1)

[Scope of utility model registration request] An endless crawler track 13 with a track roller 13a provided for each link 13b is wound between the front rail 4 and the sprocket 12 provided at the front and rear of the track frame 2, and below the track frame 2, A track rail 8 is provided to guide the rolling of the crawler roller 13 a, and the track rail 8 is provided at the end of the track rail 8 on the sprocket 12 side, and the crawler roller is centered at a center point 01 set forward from the center O of the sprocket 12. 13a and the pitch circle PCD of the sprocket 12, the crawler roller 13a is set to be slightly apart from the track rail 8, and the crawler roller 13a one pitch ahead of the intersection a is set to be slightly apart from the track rail 8. The suspension device for a tracked vehicle is formed by forming a curved portion 8d that is supported by a curved portion 8d and connected by a smooth curve.