Excavator swing mechanism

Abstract

The excavator slewing mechanism comprises a driving part and a slewing speed reducer, the driving part is a closed motor or a motor, and the excavator slewing mechanism is characterized in that the driving part and the slewing speed reducer are connected through a hydraulic brake, and the hydraulic brake comprises a shell fixed between the driving part and the slewing speed reducer; the transmission shaft is arranged along the central axis, the friction plate set can be in friction fit with the transmission shaft for braking, the piston is supported on the friction plate set and can move up and down in the shell, the spring pushes the piston to press the friction plate set downwards, the lower end of the transmission shaft is connected with an input shaft of the rotary speed reducer, and the upper end of the transmission shaft is connected with the output end of the driving piece. A high-pressure oil cavity is defined by the piston and the shell, and the piston enters the high-pressure oil cavity along with high-pressure oil and moves upwards to compress the spring and loosen pressing on the friction plate set. The rotary speed reducer is matched with the closed motor or the motor, and the brake is added, so that the brake function of the rotary mechanism is realized.

Description

Technical Field

[0001] The utility model relates to an excavator rotary mechanism and belongs to the technical field of excavator systems. Background Art

[0002] Slewing reducers are mainly used in common excavators, truck cranes, rotary drilling machines and other similar engineering machinery. They rely on the motor to drive the slewing reducer to reduce the rotational output of the hydraulic motor and increase its output torque, which can adapt to extremely harsh working environments.

[0003] At present, the excavator system mainly uses an open hydraulic system. Since the open system has a large energy loss, low efficiency and high energy consumption, the new generation of excavators use a closed hydraulic system or a new energy power operation system, which can achieve energy recovery, high efficiency and low energy consumption. The open motor used in the open system has a built-in braking function, and all the excavator slewing reducers matched with it do not have brakes. The closed motor or motor does not have a braking function, and a brake needs to be added to the reducer matched with it to realize the braking function of the slewing mechanism. Utility Model Content

[0004] The utility model provides an excavator slewing mechanism, in which the driving part is a closed motor or an electric motor, and a hydraulic brake is added between the driving part and the slewing reducer. The closed motor or the electric motor can drive the slewing reducer to rotate, thereby driving the excavator to perform a slewing motion, thereby forming a match between the slewing reducer and the closed motor or the electric motor and adding a brake, thereby realizing the braking function of the slewing mechanism.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The excavator slewing mechanism includes a driving member and a slewing reducer, wherein the driving member is a closed motor or an electric motor, and is characterized in that: the driving member and the slewing reducer are connected through a hydraulic brake, and the hydraulic brake includes a shell fixed between the driving member and the slewing reducer, in which a transmission shaft arranged along the central axis, a friction plate group that can cooperate with the transmission shaft for friction braking, a piston supported on the friction plate group and capable of moving up and down in the shell, a spring that pushes the piston downward to press the friction plate group, the lower end of the transmission shaft is connected to the input shaft of the slewing reducer, and the upper end is connected to the output end of the driving member, the piston and the shell together form a high-pressure oil chamber, and the piston moves upward as the high-pressure oil enters the high-pressure oil chamber to compress the spring and release the pressure on the friction plate group.

[0007] Preferably, the piston and the friction plate group are coaxially sleeved on the outer periphery of the transmission shaft, the friction plate group is supported on the inner wall of the housing, an annular space is formed between the transmission shaft and the piston, and the spring is arranged in the annular space.

[0008] Preferably, a baffle is arranged above the piston, a positioning retaining ring is mounted on the inner wall of the shell and is located above the baffle, the top end of the spring abuts against the baffle, and the bottom end of the spring abuts against the piston.

[0009] Preferably, the high-pressure oil chamber is an annular chamber enclosed by the housing and the piston, and an oil hole communicating with the high-pressure oil chamber is provided on the housing.

[0010] Preferably, the transmission shaft consists of shaft one and shaft two which is splined and extends into shaft one, shaft one is connected to the output end of the driving member, shaft two is connected to the input shaft of the rotary reducer, the piston and the friction plate group are coaxially sleeved on the outer periphery of shaft one, and the friction plate group consists of a dynamic friction plate which is splined with shaft one and a static friction plate which is alternately stacked with the dynamic friction plate.

[0011] The beneficial effects of the utility model are:

[0012] The utility model discloses an excavator slewing mechanism, wherein the driving member is a closed motor or an electric motor, and a hydraulic brake is added between the driving member and the slewing reducer, wherein a transmission shaft in the hydraulic brake connects an output end of the driving member and an input shaft of the slewing reducer, and when the high-pressure oil chamber does not enter the high-pressure oil, a spring pushes the piston to move downward and press the friction plate group, and the friction plate group and the transmission shaft form a friction matching brake, and the transmission shaft is in a locked state, and the power of the driving member will not be transmitted from the transmission shaft to the slewing reducer, and when the high-pressure oil enters the high-pressure oil chamber, the piston is lifted, the compression on the friction plate group is released, and the spring is compressed, so that the friction plate group releases the friction braking constraint on the transmission shaft, and the transmission shaft is in a rotatable state, and the power of the driving member is transmitted to the slewing reducer via the transmission shaft, so that the torque is transmitted from top to bottom, and the closed motor or the electric motor can drive the slewing reducer to rotate, and then drive the excavator to perform a slewing action, so as to form a match between the slewing reducer and the closed motor or the electric motor and add a brake, so as to realize the braking function of the slewing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the excavator slewing mechanism in a specific implementation manner.

[0014] Figure 2 It is the assembly diagram of hydraulic brake and slewing reducer.

[0015] Figure 3 A schematic diagram of a hydraulic brake. DETAILED DESCRIPTION

[0016] Combine the following Figures 1 to 3 The embodiments of the present utility model are described in detail.

[0017] The excavator slewing mechanism includes a driving member 1 and a slewing reducer 2. The driving member 1 is a closed motor or an electric motor, and is characterized in that: the driving member 1 and the slewing reducer 2 are connected through a hydraulic brake 3. The hydraulic brake 3 includes a shell 4 fixed between the driving member 1 and the slewing reducer 2. The shell 4 is equipped with a transmission shaft 5 arranged along the central axis, a friction plate group 6 that can cooperate with the transmission shaft for friction braking, a piston 7 supported on the friction plate group 6 and able to move up and down in the shell 4, and a spring 8 that pushes the piston 7 downward to press the friction plate group 6. The lower end of the transmission shaft 5 is connected to the input shaft of the slewing reducer 2, and the upper end is connected to the output end of the driving member 1. The piston 7 and the shell 1 enclose a high-pressure oil chamber A. The piston 7 moves upward as the high-pressure oil enters the high-pressure oil chamber 7 to compress the spring 8 and release the pressure on the friction plate group 6.

[0018] In the above-mentioned excavator slewing mechanism, the driving member 1 is a closed motor or an electric motor, and a hydraulic brake 3 is added between the driving member 1 and the slewing reducer 2. The transmission shaft 4 in the hydraulic brake 3 connects the output end of the driving member 1 and the input shaft of the slewing reducer 2. When the high-pressure oil chamber A does not enter the high-pressure oil, the spring 8 pushes the piston 7 to move downward and press the friction plate group 6. The friction plate group 6 and the transmission shaft 5 form a friction matching brake. The transmission shaft 5 is in a locked state, and the power of the driving member 1 will not be transmitted from the transmission shaft 5 to the slewing reducer 2. When When the high-pressure oil enters the high-pressure oil chamber A, the piston 7 is lifted, the pressure on the friction plate group 6 is released, and the spring 8 is compressed, so that the friction plate group 7 releases the friction braking constraint on the transmission shaft 5, and the transmission shaft 5 is in a rotatable state. The power of the driving member 1 is transmitted to the rotary reducer 2 through the transmission shaft 5, realizing the transmission of torque from top to bottom. The closed motor or motor can drive the rotary reducer 2 to rotate, and then drive the excavator to perform a rotary action, forming a match between the rotary reducer and the closed motor or motor and adding a brake, so as to realize the braking function of the rotary mechanism.

[0019] The piston 7 and the friction plate group 6 are coaxially sleeved on the outer periphery of the transmission shaft 5, the friction plate group 6 is supported on the inner wall of the housing 4, an annular space is formed between the transmission shaft 5 and the piston 7, and the spring 8 is arranged in the annular space. When the high-pressure oil does not enter the high-pressure oil chamber A, the elastic force of the spring 8 acts on the piston 7 to make the piston 7 press the friction plate group 6 downward, and the friction plate group 6 and the transmission shaft 5 form a friction matching brake, and the transmission shaft 5 cannot rotate and will not transmit the transmission torque. When the high-pressure oil enters the high-pressure oil chamber A, the oil pressure overcomes the spring elastic force to lift the piston 7, and the piston 7 is separated from the friction plate group 6. The friction plate group 6 is in a loose state without being pressed, and will not form a friction constraint on the transmission shaft. The transmission shaft 5 can rotate and transmit the transmission torque to the rotary reducer 2.

[0020] Among them, a baffle plate 9 is arranged above the piston 7, a positioning retaining ring 10 is arranged on the inner wall of the housing and is located above the baffle plate 9, the top end of the spring 8 abuts against the baffle plate 9, and the bottom end abuts against the piston 7. The positioning retaining ring 10 is stuck on the inner wall of the housing 4, the spring 8 supports the baffle plate 9 and abuts against the positioning retaining ring 10, and the piston 7 is arranged below the baffle plate 9. When the piston 7 moves upward and contacts the baffle plate 9, the upward movement displacement of the piston 7 is limited, and the piston 7 cannot continue to move upward. The baffle plate 9 limits the upward movement of the piston 7 to prevent the piston 7 from moving upward beyond the limit.

[0021] The high-pressure oil chamber A is an annular chamber enclosed between the housing 4 and the piston 7, and the housing 4 is provided with an oil hole 41 connected to the high-pressure oil chamber A. The oil hole 41 is connected to the high-pressure oil chamber A for oil to enter and exit the high-pressure oil chamber A. When oil enters, the piston 7 moves upward, and when oil exits, the spring pushes the piston 7 downward again.

[0022] The transmission shaft 5 is composed of a shaft 1 51 and a shaft 2 52 which is splined and extends into the shaft 1 51. The shaft 1 51 is connected to the output end of the driving member 1, and the shaft 2 52 is connected to the input shaft of the rotary reducer 2. The piston 7 and the friction plate group 6 are coaxially sleeved on the outer periphery of the shaft 1 51. The friction plate group 6 is composed of a dynamic friction plate splined with the shaft 1 51 and a static friction plate alternately stacked with the dynamic friction plate. The dynamic friction plate of the friction plate group 6 is splined with the shaft 1 51 and will rotate synchronously with the shaft 1 51. When the spring 8 pushes the piston 7 to press the friction plate group 6, the dynamic friction plate and the static friction plate are pressed against each other to form a friction fit so that the shaft 1 51 cannot rotate, thereby achieving braking. When the piston 7 moves upward to release the compression of the friction plate group 6, the dynamic friction plate and the static friction plate are in a loosened state without being compressed, and no friction force is formed. The shaft 1 51 can rotate, and the power of the driving member 1 is transmitted to the rotary reducer 2 via the shaft 2 52.

[0023] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. The excavator slewing mechanism includes a driving member and a slewing reducer, wherein the driving member is a closed motor or an electric motor, and is characterized in that: The driving member and the rotary reducer are connected through a hydraulic brake. The hydraulic brake includes a shell fixed between the driving member and the rotary reducer. The shell is equipped with a transmission shaft arranged along the central axis, a friction plate group that can cooperate with the transmission shaft for friction braking, a piston supported on the friction plate group and able to move up and down in the shell, and a spring that pushes the piston downward to press the friction plate group. The lower end of the transmission shaft is connected to the input shaft of the rotary reducer, and the upper end is connected to the output end of the driving member. The piston and the shell together form a high-pressure oil chamber. The piston moves upward as the high-pressure oil enters the high-pressure oil chamber to compress the spring and release the pressure on the friction plate group.

2. The excavator slewing mechanism according to claim 1, characterized in that: The piston and the friction plate group are coaxially sleeved on the outer periphery of the transmission shaft, the friction plate group is supported on the inner wall of the shell, an annular space is formed between the transmission shaft and the piston, and the spring is arranged in the annular space.

3. The excavator slewing mechanism according to claim 2, characterized in that: A baffle is arranged above the piston, a positioning baffle ring is arranged above the baffle on the inner wall of the shell, the top end of the spring abuts against the baffle, and the bottom end of the spring abuts against the piston.

4. The excavator slewing mechanism according to claim 2, characterized in that: The high-pressure oil chamber is an annular chamber enclosed by the housing and the piston, and an oil hole communicating with the high-pressure oil chamber is provided on the housing.

5. The excavator slewing mechanism according to claim 2, characterized in that: The transmission shaft is composed of shaft one and shaft two which is splined and extends into shaft one. Shaft one is connected to the output end of the driving member, and shaft two is connected to the input shaft of the rotary reducer. The piston and the friction plate group are coaxially sleeved on the outer periphery of shaft one. The friction plate group is composed of a dynamic friction plate which is splined with shaft one and a static friction plate which is alternately stacked with the dynamic friction plate.

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