SU914825A1 - Hydraulic drive - Google Patents

Description

The invention relates to a hydraulic stepless creeper, used, for example, in multi-bucket excavators and providing low operating speeds of the excavator and their stepless change in a wide range.

A hydraulic actuator is known, for example, a multi-bucket excavator containing a pump, a hydraulic distributor with a steerable drive, a tank with a working fluid and two hydraulic motors, each of which has two working and return cavities, the return cavities of the hydraulic motors being connected to each other, and the working cavities are connected via hydraulic distributor pump and tank with a working fluid p}.

The disadvantage of the known hydraulic drive are large.

The purpose of the invention is to reduce the size.

This goal is achieved by the fact that hydraulic motors are made blades2

non-rotary, mounted in the same housing and equipped with one-way clutches mounted on a common shaft, and the valve of the control valve is designed as a cam mounted on a common shaft.

FIG. 1 presents the diagram of the hydraulic drive; in fig. 2 is a kinematic diagram of a creeper of a multi-bucket excavator; in fig. 3 ~ blade semi-rotary hydraulic motors, incision; in fig. 4 shows section A-A in FIG. 3; in fig. 5 is a section bB in FIG. The hydraulic actuator contains a pump 1, a hydraulic distributor 2 with a rod 4 controlled from the drive 3, a tank 5 with a working fluid, and two hydraulic motors 6 and 7, each of which has two working cavities 8 and a returnable 9, and the return cavities 9 of hydraulic motors 6 and 7 are connected between themselves, and the working cavity 8 is connected through the valve 2 to the pump 1 and the tank 5 with

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working fluid. Hydromotors 6 and 7 are made of blade semi-rotary, mounted in one housing 10 and equipped with freewheels mounted on a common shaft 11, and 5 the drive 3 of the stem 4. The hydraulic distributor 2 is designed as a cam mounted on a common shaft 11.

The freewheel clutch of the hydraulic motor 6 is formed by the rotor 12 and the sliding key 13. The freewheel clutch of the hydraulic motor 7 is made in a similar way.

Sliding key 13 is made in such a way that it ensures the transmission of torque in one direction only. when the rotor of the hydraulic motor rotates in the opposite direction, it is freely installed in the grooves of the shaft 11. 20

Shaft 11 is connected via a gear coupling 1 ί | (Fig. 2) with the axis of the drive wheel 15, which in turn through the track chain 16 is connected to the drive wheel 17 of the tractor.

For normal operation of the creeper when moving forward, the housing 10 of the hydraulic motors (FIG. 5) is provided with a latch 13.

The hydraulic actuator works as follows ³⁰ times.

On the operating mode, the hydraulic pump 1 supplies oil through the piping system (Fig. 1 and 4) to the distributor 2, which in turn directs it ³⁵ to the working cavity 8 of one of the hydraulic motors 6 or 7, while the working cavity of the other hydraulic motor is connected to tank 5So how returnable cavities 9 hydro-. ⁴⁰ romotors b and 7 are interconnected, then at that moment, when one of the hydraulic motors 6 or 7, the working cavity 8 of which is connected to the pump 1, rotates the shaft 11 by means of a sliding ⁴⁵ key 13, one-way clutch, the second hydraulic motor 7 or 6 turns · relative to shaft 11 in the opposite direction (key Ί3 of this hydraulic motor is recessed). 50

When the shaft 11 is rotated at a certain angle, the hydraulic distributor 2 is switched by cam 3 and the pressurized fluid from pump 1 enters the working cavity 8 of another hydraulic motor 7 ⁵⁵ or 6, and the working cavity 8 of the first is connected to tank 5 and the process repeats. Thus, the alternate

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the connection of the working cavities 8 of the hydraulic motors 6 or 7 by the hydraulic distributor 2 to the pump 1 provides rotational movement with a small speed of the shaft 11 in one direction.

Further, the shaft 11 (FIG. 2) transmits the rotation through the gear coupling 14 to the drive wheel 15 and through the chain 16 to the wheel 17 of the tractor.

. In the transport mode, the torque from the tractor engine (Fig.'2) through the gearbox comes to the wheel 17, which through the chain 16, the wheel 15, the gear coupling 14 rotates the shaft 11. Since the transport speed is an order of magnitude higher than the operating speed, the angular the speed of the shaft 11 is greater than the speed of rotation of the rotor 12 of the hydraulic motor 6, which together with the sliding key 13 is a freewheel clutch. In this case, the key 13 is periodically integrated in the recesses of the rotor 12, allowing the shaft 11 to rotate freely without transmitting torque.

When moving back at transport speed, the housing 10 of the hydromotors is released from the detent 18 (figure 5), and the torque also comes from the tractor engine to the wheel 17 (FIG. 2), which transmits rotation of the gear coupling 14 through the chain 16, wheel 15 shaft 11, which in turn through the sliding key 13 and the rotor 12 of the hydraulic motor 6 or 7 rotates the housing 10 of the hydraulic motors idle.

Claims (1)

Claim A hydraulic actuator, for example, a multi-bucket excavator, contains a pump, a hydraulic distributor with a drive-controlled rod, a tank with a working fluid, and two hydraulic motors, each of which has two working and return cavities, the return cavities of the hydraulic motors are interconnected, and the working cavities are connected via hydraulic distributor pump and tank with a working fluid, characterized in that, in order to reduce the size, the hydraulic motors are made vane semi-rotary, installed in one 914825 6 housing and equipped with a free wheel couplings mounted on a common shaft, and the actuator stem valve is made in the form of a cam mounted on a common shaft.