JPS609954B2 - Track adjustment/buffer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a crawler adjustment/shock device that adjusts the tension of a crawler in a crawler type wheel and absorbs and alleviates an excessive load applied to the crawler.

Crawler-type vehicles such as hydraulic excavators are equipped with adjustment and shock absorbing devices to adjust the tension of the crawlers (also called crawlers or endless tracks) and to absorb and alleviate the increase in load that occurs when foreign objects get caught in the crawler. is included.

Figure 1 shows how the crawler is adjusted and the shock absorber installed in a crawler-type vehicle. In FIG. 1, sprockets (wheels) 103 and idlers 104 are attached to the front and rear of a track frame i02 on both sides of a vehicle body 101, a crawler 105 is attached to these, and a crawler adjustment/shock device 106 is connected to the idler 104. ing. In addition, the code 107 in the drawing is a crawler 105.
This is a guide roller that guides the Details of this crawler adjustment/buffer device 106 are shown in FIG. 2.

This figure shows a cross section of the crawler adjustment/buffer device 106, and shows the idler support member 1 that supports the idler 104.
08 is bolted to the spring receiver 109. A buffer spring 111 is supported between this spring holder 109 and another spring holder 110 facing it, and one end of this spring 111 passes through the first spring holder 110 and is integrated with the Hydra-side piston turtle 82. The other end is tightened by screwing a nut 114 onto a bolt 113 that passes through the spring receiver 109, so that it will not operate under a set load. The piston is housed in the cylinder military electric moat on the side opposite the side, which is attached to the frame electric fin 2 in the Dragon Map. sprocket soni 8
The initial load to provide tension is the grease inlet installed in the cylinder, which is placed between the electric fins of the sardine turtle. By introducing the spring, the piston is pushed and moved to the idler electric crab W, and the tension of the crawler electric crab is adjusted.

If excessive force is applied to the crawler by biting into a foreign object, the force will be absorbed and alleviated as described above. In the composition diagram, the symbol ``Ryuryurema'' is a stopper, and the symbol ``Shigetomiya'' is the outer frame of the spring government cable. Currently, crawler-type construction machines are becoming larger, and accordingly, crawler adjustment 9 shock absorbers are also required to be larger, that is, to have a larger capacity.

However, since various devices and guide rollers are attached to the track frame of a crawler-type vehicle, it was not possible to secure a large installation space as the crawler adjustment field mitigation device became larger. Therefore, I came up with the idea of attaching only a piston-cylinder mechanism to the truck frame to obtain the initial tension, but using piping to transmit that pressure to the outside of the accumulator, which was limited by the space available on the car body. . However, replacing the two buffer spring mechanisms included in the piston cylinder mechanisms on each side of the car shrine with X accumulators satisfies the following requirements. Do not move more than the maximum stroke even if the maximum stroke is achieved alone or at the same time.

'b) The initial force of 10% to 10% of the piston movement start load can be adjusted separately for the left and right sides, and can be restored to the initial set load even after operation.

'c} When only one piston is operating, do not affect the other piston that is not operating.

Therefore, simply connecting the left and right piston cylinder looms and the accumulator through piping cannot satisfy the requirements of the wind system (b) and (c).

Additionally, as the pressure transmission medium, ``grease has too high a viscosity, so hydraulic oil must be used.

However, when hydraulic oil is used, it is thought that leaks are bound to occur.6 Replenishment of this leakage can be done without special equipment or tools, or automatically if possible.Due to the conditions of use of construction machinery, etc. I need to yell. The present invention aims to solve the above-mentioned problems caused by the increase in the size of the crawler adjustment mother shock absorber.The structure of the present invention is to solve the above-mentioned problems caused by the increase in the size of the crawler adjustment mother shock absorber. Form an iron bag on the supporting part of the aid on the left side of the side where the belt is applied, and press the drum pin outside the cylinder on the idler side. The floating piston, whose movement is regulated by the inner wall surface of the cylinder, is freely oscillated and the accumulator is supplied as pressure medium to the pressure medium supply chamber defined by the floating piston and the idler side cylinder. Grease is applied to an initial tension adjustment chamber defined by the idler piston, the floating piston, and the idler side cylinder. It is characterized in that it is connected to a supply source.

In other words, a floating piston is inserted after the pistons attached to the left and right idlers, and the grease for initial tension adjustment and the pressure transmission medium are separated at this position.

Furthermore, the movable range of this floating piston is limited by the swinger to correspond to the maximum stroke of the idler piston.This allows the pressure between the accumulator and the floating piston to be sufficiently higher than the pressure corresponding to the initial tension. The floating piston is also forced onto the stopper on the idler side. Even if the load from the idler strike increases and exceeds the operating load, the floating piston begins to move and the pressure inside the accumulator increases. During this time, the pressure in the accumulator increases. Regarding the idler side, ``The pressure difference of the floating piston only increases, so it can only be forced onto the stopper and has no effect.

Furthermore, in many cases, hydraulic power is used for traveling and screen-making work in scaffolding machines and the like. However, under normal operating conditions, the pressure is low, but depending on the operating conditions, a high pressure of around 200 kg is generated. Even if this high pressure in the main loop is used, and hydraulic oil is replenished, the pressure inside the accumulator will decrease. hold high.
Therefore, the replenishment of hydraulic oil can be carried out without any special equipment or tools, and can be carried out automatically.An embodiment of the present invention will be described below with reference to FIG.

In FIG. 3, which schematically shows the structure, the idler side piston 3 is integrated with idler support members 2 and 2' that respectively support the left and right idlers 1 and 1' on which the left and right cloves are hung. 3' is formed, and these pistons 3, 3'
is installed in the idler side cylinder turtle 4' attached to the truck frame. These cylinders 4, 4' are provided with initial tension adjustment grease injection ports 6, 6', respectively, for injecting grease, which is a pressure medium, into the cylinders 4, 4'. Further, in the idler side cylinders 4 and 4', floating pistons are movably inserted between the idler-side inner wall surfaces Kamiro and Q' and the accumulator-side inner wall both wings and Tortoise]', respectively. ing.
One end of the piping 8 and the pipe 8' are connected inside the cylinder 4; the pond side of the pipe 8' is connected, and the pipe 2 is
It is connected to the accumulator 9 by. Is the pipe 13 branching from the pipe 12 a check valve? It is connected to the main hydraulic pump that supplies pressure to various work actuators, which is a pressure medium supply section. The strokes of the floating pistons 5, 5' are limited by a stopper (wall surface 11, stopper) in accordance with the maximum stroke of the pistons 3, 3'. Next, to explain the function of the abdominal band adjustment buffer device configured in this way, the pressure of the main hydraulic pump changes significantly, but due to the action of the check valve 1, the pressure PA of the piping and accumulator 9 Hydraulic pump is held at maximum pressure.

If the cross-sectional area of the floating pistons 5, 5' is AF, then the shock absorber's starting load Fo is Fo=PAXAF.
When the maximum stroke of the floating piston 5 and the horse' is IF, the cross-sectional area of the piston 383' is Apt, and the maximum stroke is lp, there is a relationship of AF×IF=Ap×lp. The initial tension Fj is about 10 to 20% of the operation start load Fo,
This initial tension Fi is given as an initial value of the pressure Pp between the piston 39 3' and the floating pistons 5, 5' by injecting grease from the initial tension adjusting grease injection ports 6, S'. According to the idler army, a', when no load other than Fi is applied, ``Pp<<PA, so the floating piston flea, 5', is forced onto the wall base 1, which is a stopper provided on the cylinder 4.

When a load greater than the activation start load Fo of the shock absorber is applied from the idler tortoise, PA=Pp, and both the piston 3 and the floating piston 5 start moving. When the floating piston 5 moves to the maximum stroke LF, the movement of the stopper blade provided on the cylinder 4 is stopped.During this time, the other shock absorber is operated to the extent that PA rises by the volume change.
No changes occur. In this state, the other idler 1
'If a load greater than the operating load is applied to piston 3,
With floating piston 5r! It is possible to start this movement and move up to the maximum stroke IF. For pressure transmission between the accumulator 9 and the floating pistons 5, 5', if grease is used, the resistance will be too large and the piping 8, turtle 2, S3 will become very thick, so hydraulic oil will be used.

However, when used for a long period of time, hydraulic oil leaks and a pressure drop in the accumulator 9 pressure PA occurs. Piping 8
, i2713 are supplied to the main hydraulic pump by turning on the check valve 7, so that the accumulator pressure PA is maintained at a constant value and replenishment is automatically performed even if there is a leakage of hydraulic oil. As described above in detail in this embodiment, according to the waist belt adjustment 8 shock absorber of the present invention, the conventional spring mechanism, which used to have two spring mechanisms, one each on the left and right sides, is replaced with a single accumulator. We can provide a track adjustment and shock absorbing device with sufficient performance even for aircraft, and the maximum stroke can be achieved independently or simultaneously on the left and right sides, and the initial tension can be restored separately for the left and right sides.
Even when hydraulic oil is used as the pressure medium, leakage replenishment and pressure maintenance can be performed automatically because the main hydraulic pump is connected to the main hydraulic pump via a check valve.

In this way, the crawler track adjustment according to the present invention.

The shock absorber is provided on the left and right sides of the crawler garage, and forms idler pistons on the left and right idler support members on which the waist belts are attached in pairs with sprockets, respectively, and slides the idler pistons into the idler side cylinders. A floating piston whose movement is restricted by the inner wall surface of the cylinder is slidably mounted on the idler side cylinder, and a pressure medium supply chamber defined by the floating piston and the idler side cylinder is provided with an iron bag. The accumulator is connected via a pressure medium supply path, and a pressure medium supply section is connected to the pressure medium supply path via a check valve, and is defined by the idler piston, the floating piston, and the idler side seeder. By connecting a grease supply source to the initial tension adjustment chamber, the space occupied by the device along the track frame can be reduced.
This makes it possible to adjust the tracks and adjust the shock absorber to accommodate larger crawler vehicles. In addition, the maximum stroke can be achieved on the left and right sides individually or simultaneously, and the initial tension can be restored separately on the left and right sides, expanding the range of use of the device. Furthermore, even if hydraulic oil is used, leakage can be replenished and pressure maintained automatically.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a crawler type vehicle, FIG. 2 is a sectional view of a secondary twill adjustment and shock absorbing device, and FIG. 3 is a sectional view of essential parts showing an embodiment of the present invention. 1, 1'... Idler, 2, 2'... Idler support member, 3, 3'... Idler side piston, 4, 4'...
...・Idler side cylinder, 5, 5'...Floating piston,
6, 6'... Grease inlet for initial tension adjustment, 7
...Check valve" 89 8', amount 2, 13...Piping~9...Accumulator. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. An idler piston is formed on the support member of the left and right idlers, which are provided on the left and right sides of the crawler vehicle, and on which the crawler tracks are applied in pairs with the sprocket, respectively, and the idler piston is slidably fitted into the idler side cylinder, A floating piston whose movement is regulated by an inner wall surface of the cylinder is slidably fitted into the idler side cylinder, and an akimulator is connected to a pressure medium supply path in a pressure medium supply chamber defined by the floating piston and the idler side cylinder. A pressure medium supply section is connected to the pressure medium supply path via a check valve, and a grease supply source is connected to the initial tension adjustment chamber defined by the idler piston, the floating piston, and the idler side cylinder. A crawler track adjustment/buffer device characterized by connecting.