JPH0220244Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a braking device for a hydraulic roller for road compaction.

(b) Prior Art Recently, the running drive of this type of roller is constructed using a closed circuit system, which combines a hydraulic pump directly connected to the prime mover and a hydraulic motor, that is, the circuit is closed at the neutral position of the operating lever.

By adopting this system, unlike conventional mechanical transmissions, it became possible to effectively brake the rollers themselves by closing the hydraulic circuit when the operating lever of the hydraulic pump was in the neutral position.

Therefore, safety is extremely high during work, particularly when working on slopes, loading and unloading rollers on roller conveyance vehicles, etc.

Furthermore, in this kind of roller, the driver rides on the tower,
Currently, large rollers are required by law to be equipped with a brake pedal to brake the roller body.

(c) Problems to be solved by the invention However, as mentioned above, it is a roller whose running source is a hydraulic pump connected to a prime mover, and a brake pedal is provided separately from the operating lever of the hydraulic pump, and the operating lever is With a brake pedal type roller that applies braking without returning to the neutral position, pressure oil continues to be supplied to the hydraulic motor, so
Stopping the drive wheels requires a large amount of braking force, and with rollers that drive both the front and rear wheels,
If only one wheel is braked, the pressure oil will be doubled to the other wheel's hydraulic motor, so it is necessary to brake both wheels.

Therefore, it is impossible to stop the main body immediately, and there is a problem in that it poses a great danger, especially on an inclined surface.

(d) Means for solving the problem Therefore, in the present invention, a part of the hydraulic pressure of the master cylinder is sent to the neutral cylinder in conjunction with the operation of the brake pedal, and the operation of this neutral cylinder is controlled by a double-acting mechanism. The signal is transmitted to the operating shaft that controls the hydraulic pump via the hydraulic pump, and the supply of pressure oil to the hydraulic pump is automatically stopped.

At this time, the rotation of the operating shaft is prevented from affecting the pedal side through the buffer cylinder.

The gist of the present invention will be explained below based on the embodiments shown in the drawings.

(e) Embodiment Therefore, in the present invention, as shown in the roller shown in Fig. 5, the prime mover 2 and the hydraulic pump 3 are mounted on the frame 1 of the roller via the mount 4, and the operating lever is mounted on one side of the handle. A brake pedal 5 is provided, and a brake cylinder 8 and a neutral cylinder 9 are connected to each other via a master cylinder 6 interlocked with the brake pedal 5. It is designed to send pressure oil to.

Further, the front and rear wheels are driven by operating a control lever 27 by sending pressure oil from a hydraulic pump 3, which is a known variable displacement pump, to hydraulic motors 10, 10' which are known fixed displacement motors. There is. The combination of the hydraulic pump 3 and the hydraulic motors 10, 10' is constructed in a closed circuit manner, that is, the circuit is closed at the neutral position N of the operating lever 27.

FIG. 1 is an enlarged side view of the device of the present invention, and FIG. 2 is a rear view of FIG. The pump swash plate is tilted via the operation shaft 11 with a fixed swash plate, and the discharge amount of pressure oil is controlled according to the angle. 12 is a connecting rod connected to the aforementioned operating lever 27; 13;
is an auxiliary lever for forward and backward movement that is pivotally supported in the center; one end is pivotally supported on the connecting rod 12, and the other end is pivotally supported on one of the buffer rods 15 of the buffer cylinder 16. The other buffer rod 15' is pivotally supported on the operating rod 14.

16' is a spring. This operating rod 14 has a base fixed to the aforementioned operating shaft 11, and the same shaft 1
A fan-shaped operation plate 17 is also fixed to 1. Therefore,
The operation of the operating lever 27 (shown in the fifth figure) is transmitted to the operating rod 14 via the connecting rod 12, the auxiliary lever 13, and the buffer cylinder 16, and further transmitted from the operating rod 14 to the operating shaft 11 having a pump swash plate. The hydraulic pump 3 is operated to move the rollers forward, backward, and stop.

Next, neutral return arms 18 and 19 are loosely fitted to the operating shaft 11 independently of each other, and are connected to return rods 22 and 23 via pins 20 and 21, respectively. The other ends of the rods 22 and 23 are both pivoted 28 to a neutral return lever 24', and together with the neutral return lever 24 fixed in a V-shape to the lever 24', are pivoted to a shaft 29. It is opposed to the Toral cylinder 9.

25 is a spring that rotates the reciprocating levers 24, 24' clockwise about the shaft 29, and 26 is a hydraulic hose.

(e) Function In the device of the present invention having the above configuration, when the operating lever 27 is tilted backward (position R) to move backward, the auxiliary lever 13 is moved in the R direction in FIG. 3 via the connecting rod 12. The operating rod 14 is rotated in the R direction via the buffer cylinder 16. Therefore, the operating shaft 11 is rotated clockwise in the drawing, and the roller is moved backward. At this time, the operation shaft 11 and the pair of operation plates 17 are also rotated at the same time, and one side thereof comes into contact with the pin 21.

While moving backward in this state, when the brake pedal 5 is depressed, part of the pressure oil from the master cylinder 6 is sent to the neutral cylinder 9, causing the return levers 24, 24' to be moved downward as indicated by the upper arrow in Figure 4. As a result, the operating plate 17 is rotated as shown by the arrow via the return rod 23 and the pin 21, and in conjunction with this rotation, the operating shaft 11 and the operating rod 14 are rotated in the same direction. Then, when the other side of the operation plate 17 comes into contact with the pin 20, the operation shaft 11 and the operation rod 14 are brought to the neutral position N.

In this state, the inclination angle of the pump swash plate in the hydraulic pump 3 fixed to the operating shaft 11 is 0° (the hydraulic pump 3
(neutral position), the hydraulic oil is no longer supplied to the hydraulic motors 10, 10' from the hydraulic pump 3, the hydraulic motors 10, 10' do not rotate, and the hydraulic brakes are applied to the output shafts of the hydraulic motors 10, 10'. It becomes a sticky state. Therefore, when the operation of the hydraulic pump 3 stops, the hydraulic motors 10, 10' enter the hydraulic brake state, and at the same time, the brake assembly 7 on the wheel side works, so that the roller body is instantly stopped. .

In this case, move the operating lever 27 as it is to reverse R.
Even if it is left on the side, the spring 16' is only compressed by the buffer cylinder 16.
When the brake pedal 5 is released, the vehicle will move backward again.

In the case of forward movement, this is omitted since it is performed in the completely opposite direction to that described above.

If the aircraft is to be stopped after applying the brake pedal, the operating lever 27 may be returned to the neutral position N.

(g) Effects of the invention As described above, according to the invention, when the brake pedal 5 is depressed, part of the pressure oil in the master cylinder 6 is introduced into the neutral cylinder 9,
Since the operating shaft 11 and operating rod 14 of the hydraulic pump 3 are brought to the neutral position by the operation of the cylinder 9, the brake pedal stops the hydraulic pump 3 at the same time as braking the wheels, preventing a momentary sudden stop. Not only can it be done accurately, but the operating lever 14
By interposing the buffer cylinder 16 between the control lever 27 and the auxiliary lever 13, it has excellent features such as being able to apply braking only while the pedal is being pressed while the operating lever 27 remains in the advanced state. It is extremely noticeable that it contributes to the above.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the device of the present invention incorporated into a roller, Fig. 2 is a rear view thereof, Fig. 3 is a side view showing the device in the backward movement state of the roller, and Fig. 4 is a brake. FIG. 5 is a side view of the device showing the applied state, and a schematic diagram of a roller incorporating the device. 5-brake pedal, 9-neutral cylinder, 11-operation shaft, 17-operation plate, 18, 19-
Neutral return arm, 20, 21 ~ pin, 22, 23 ~
Return rod, 24, 24' - Neutral return lever.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A neutral cylinder provided to supply a portion of the pressure oil of the master cylinder in conjunction with the operation of the brake pedal, and the inclination angle of the pump swash plate of the hydraulic pump. an operating shaft that is regulated via an operating rod that is operated from the outside; and a control shaft that is provided between the operating shaft and the neutral cylinder and that moves the operating shaft back to a neutral position based on the operation of the neutral cylinder. A hydraulic roller braking device characterized by comprising a dynamic mechanism. (2) The return mechanism includes a return lever facing the neutral cylinder, a pair of return rods that are pivotally supported on the return lever, and a pair of return rods that are loosely fitted onto the operating shaft and that have tips of the rods connected to each other via pins. A hydraulic roller braking device according to claim 1, which is a registered utility model and comprises a pivotally supported operating arm and an operating plate fixed to an operating shaft and opposed to the pin. (3) The hydraulic roller braking device according to claim 1, wherein a buffer cylinder is provided between an operating rod integrated with the operating shaft and an auxiliary lever for forward and backward movement linked to the operating rod.