JPH0315608Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a traveling drive device for compaction machines such as vibrating rollers and road rollers.

(Prior art) A traveling drive device that rotationally drives the front drum of a compaction machine such as a vibrating roller or a road roller has a drum rotatably pivoted to a pair of left and right support brackets extending from the vehicle body into the end of the drum. A single hydraulic motor attached to one support bracket within one end of the drum rotates the main gear on the drum side, and pressure oil is supplied to the hydraulic motor from a hydraulic pump driven by the engine. Supplied.

As mentioned above, the reason why a hydraulic motor is used is that it is low speed and high torque due to the working characteristics of the compaction machine, and the speed can be controlled freely, and because it is installed in a narrow space inside the drum, it is small and can provide high torque. etc.

(Problem to be solved by the invention) In the traveling drive device of the compaction machine mentioned above, when performing compaction work, the power characteristics of low speed and high torque are sufficient as described above. When self-propelled to the work site, it is desirable to have high-speed, low-torque power characteristics.

Conventional equipment was equipped with only one hydraulic motor to drive the drum, so due to the characteristics of the hydraulic motor, it has both low speed and high torque characteristics and high speed and high torque characteristics.
It was impossible to combine this with low torque characteristics.

That is, there was a problem in that if the torque was increased, the traveling speed would be decreased, and if the traveling speed was increased, the torque would be decreased.

Therefore, it is possible to use a two-speed hydraulic motor that can switch between high and low speeds, but since this two-speed motor has a large axial dimension, it cannot be housed compactly within one end of the drum, and it protrudes outside the drum end surface. It cannot be placed unless it is moved or pushed far into the center of the drum.

When the hydraulic motor is made to protrude outside the end surface of the drum,
The curve clearance of the compaction machine is significantly reduced and the load clearance is increased, causing various problems in compaction work.Also, when the hydraulic motor is inserted into the center of the drum, the dimension from the drum end face to the rib becomes large. There is a problem in that the structural strength of the end portion of the drum decreases.

The present invention was made to solve the above problems, and is a compaction machine that can be stored compactly within the end of the drum and has both low speed and high torque characteristics and high speed and low torque characteristics. The purpose of the present invention is to provide a traveling drive device.

(Means for Solving the Problems) A traveling drive device for a compaction machine according to the present invention is a traveling drive device that rotationally drives a drum of a compaction machine. A support bracket is connected to the vehicle body within one end of the drum, two sets of hydraulic motors are attached to the support bracket, and the pinions provided at the output shaft ends of these hydraulic motors are respectively meshed with the main gear. A hydraulic motor is connected in parallel to a hydraulic pump, and the hydraulic circuit of one hydraulic motor is equipped with a switching valve that can be freely switched between an open position that supplies pressure oil to the hydraulic motor and a closed position that does not supply pressure oil. It is.

(Function) Since the present invention is constructed as described above, when the switching valve is in the open position and pressurized oil is supplied to the two hydraulic motors, a low-speed, high-torque driving force can be obtained.
When the switching valve is in the closed position and pressure oil is supplied to only one hydraulic motor, high-speed, low-torque driving force can be obtained.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the vibrating roller R is equipped with one steel drum 1 as a front wheel and four tire wheels 2 as rear wheels. Support brackets 4a and 4b are disposed in series within each end of the drum 1, and the drum 1 is supported by a pair of left and right support brackets 4a and 4b.

The drum 1 has a cylindrical drum main body 1a and a drum main body 1a which is placed in opposition to each other at a distance from each other.
a pair of left and right circular ribs 1b welded to the inner peripheral surface of the
1c, and on the outside of the left rib 1b, there are six anti-vibration rubbers 5 arranged at, for example, six equal parts of the circumference.
The gear fixing plate 6 is fixed through the gear fixing plate 6.
A main gear 7 is fixed to the outside of the drum 1 concentrically with bolts 8, and a support shaft 7a of the main gear 7 that protrudes outward from the main gear 7 is introduced into a pivot 9a of a support bracket 4a and is connected to two sets of conical parts. It is supported by a pivot 9a via roller bearings 10a.

On the other hand, a boss 11 is fixed to the outside of the right rib 1c concentrically with the drum 1.
1 is introduced into a pivot bracket 9b attached to a support bracket 4b via a vibration isolating rubber 5, and is supported by the pivot bracket 9b via two sets of cylindrical bearings 10b.

Incidentally, reference numeral 12 is an eccentric weight for generating vibration, and reference numeral 13 is an eccentric weight for generating vibration.
is a hydraulic motor for rotationally driving the eccentric weight 12.

As motors for rotationally driving the main gear 7, two sets of hydraulic motors 14A and 14B of the same type and capacity are mounted on the outside of the left support bracket 4a so that their shafts are parallel to the axis of the drum 1. The output shafts of the motors 14A, 14B are oil-tightly inserted through the support bracket 4a and extend inside the support bracket 4a, and a pinion 14a at the tip thereof is meshed with the main gear 7.

The two sets of hydraulic motors 14A and 14B are disposed within the left end of the drum 1 so as not to protrude from the left end surface 15 of the drum 1, but as shown in FIG. The other hydraulic motor 1 is disposed on the rear side of the pivot portion 9a.
4A is located at a position where one hydraulic motor 14B is moved approximately 120 degrees counterclockwise from the axis of the drum 1 in the side view of FIG. 1, that is, in a dead space below the pivot portion 9a and the brake device 50. be done.

A hydraulic pump 16 that supplies pressure oil to the hydraulic motors 14A, 14B and an engine 17 that drives the hydraulic pump 16 are installed in the vehicle body 3 in front of the driver's seat. Connected to 14B with hydraulic piping.

Figure 3 shows the hydraulic pump 16 and the hydraulic motor 14.
A, 14B schematic hydraulic circuit is shown, and the two sets of hydraulic motors 14A, 14B are connected to a common hydraulic pump 16.
A switching valve 18 is installed in the hydraulic circuit of one of the hydraulic motors 14A and can be switched between an open position for supplying pressure oil to the hydraulic motor 14A and a closed position for cutting off the hydraulic pressure supply.

Since the vibrating roller R needs to be switched between forward and backward movement, and the running speed needs to be adjusted as appropriate, the hydraulic pump 16 is a variable displacement pump of the discharge direction switching type, and the hydraulic motors 14A and 14B are of the rotation direction switching type. This is a constant displacement motor.

Furthermore, when the switching valve 18 is placed in the closed position, the inlet and outlet of the hydraulic motor 14A are communicated, and the hydraulic motor 14A is driven in the forward or reverse direction according to the rotation of the main gear 7.

In addition, the reference numeral 19 is an oil reservoir peripheral wall, and the reference numeral 20 is a seal for sealing the rotating and sliding portion.

Next, the operation of the traveling drive device will be explained.

When the switching valve 18 is in the open position, both hydraulic motors 14 are connected to the hydraulic pump 16.
Pressure oil is supplied to A and 14B, and main gear 7 is driven by both hydraulic motors 14A and 14B.

Therefore, in this case, the characteristics are low speed and high torque, and compaction work is performed in this state.

For example, the traveling speed of the vibrating roller R is 0~
It can be adjusted within a range of 7Km/Hr.

When the switching valve 18 is in the closed position, no pressure oil is supplied to one hydraulic motor 14A, and the entire amount of discharged oil is supplied to the other hydraulic motor 14B. is driven.

Therefore, in this case, the vibration roller R has characteristics of high speed and low torque, and when the vibrating roller R is moved to another work place, it is carried out in this state. For example, the traveling speed of the vibrating roller R is 0 to 14 km/
Adjustable within the Hr range.

Note that the switching valve 18 may be constituted by an electromagnetic directional switching valve, or, for example, three valves may constitute a valve having the same function as the switching valve 18.

In addition, two hydraulic pumps are installed, and during compaction work, each hydraulic pump drives each hydraulic motor to achieve low speed and high torque characteristics, while during forwarding, a separate switching valve is switched to generate two hydraulic motors. It is also conceivable that the pump drives one hydraulic motor.

(Effect of the invention) As explained above, in the traveling drive device for a compaction machine according to the invention, the drum is driven by two hydraulic motors connected in parallel to the hydraulic pump, and one hydraulic motor The hydraulic circuit is equipped with a switching valve that can be freely switched between an open position that supplies pressure oil to the hydraulic motor and a closed position that does not supply pressure oil. By driving, it is possible to perform compaction work with low speed and high torque driving force,
By setting the switching valve in the closed position and supplying pressure oil to one hydraulic motor to drive the drum, it is possible to run at approximately twice the speed and with approximately 1/2 the low torque during transport.

Each of the two hydraulic motors can be made compact, and since their dimensions in the drum axial direction are also small, they can be disposed compactly within the end of the drum.

Since the structure uses two hydraulic motors to generate the maximum required torque, the main gear of the drum and the pinion width of the hydraulic motor are reduced to approximately 1/2 compared to the case where the maximum required torque is generated by one hydraulic motor. This can improve the structural strength of the drum.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view of a vibrating roller, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is a schematic hydraulic circuit diagram of a traveling drive device. 1...Drum, 1a...Drum body, 1b, 1
c...Rib, 3...Car body, 4a, 4b...Support bracket, 7...Main gear, 14A, 14B...
...Hydraulic motor, 14a... Pinion, 16... Hydraulic pump, 18... Switching valve.

Claims (1)

[Scope of Claim for Utility Model Registration] In a traveling drive device that rotationally drives a drum of a compaction machine, a support bracket is provided in series from the vehicle body within one end of the drum at an outer side in the axial direction of the drum than the main gear fixed to the drum, Two sets of hydraulic motors are mounted on the support bracket, the pinions provided at the ends of the output shafts of these hydraulic motors are meshed with the main gears, and the two sets of hydraulic motors are connected in parallel to a hydraulic pump, and one of the hydraulic motors is connected in parallel to a hydraulic pump. A traveling drive device for a compaction machine, characterized in that a hydraulic circuit is provided with a switching valve that can be freely switched between an open position in which pressure oil is supplied to the hydraulic motor and a closed position in which pressure oil is not supplied to the hydraulic motor.