Electrically-driven rotary motor

Abstract

The utility model relates to a rotary motor for an excavator, in particular to an electric drive rotary motor, which comprises a motor and a speed reducer and is different from the prior art in that a motor shaft of the motor is connected with an input shaft of the speed reducer through a hydraulic brake, and when a handle returns to a neutral position during operation of the excavator, the motor is powered off, and the speed reducer is powered off. The hydraulic brake locks the motor shaft or the input shaft or a coupler connecting the motor shaft and the input shaft. The electric drive rotary motor provided by the utility model has remarkable technical advantages in the aspects of safety, accuracy, energy conservation, maintenance, comfort, adaptability, technical perspectiveness, cost effectiveness, environmental friendliness and the like.

Description

Technical Field

[0001] The utility model relates to a rotary motor for an excavator, in particular to an electric drive rotary motor. Background Art

[0002] The hydraulic swing motor is a key hydraulic power component that drives the excavator cab to rotate left and right during operation. When the excavator is operated, the swing must be braked to stop when the handle returns to the neutral position.

[0003] The electrification of new energy construction machinery has become a significant industry trend. This trend not only responds to the global call to reduce carbon emissions but also creates new growth opportunities for the industry. The advancement of electrification has made electricity the primary driving force for excavators, and the direct electric drive of the swing motor has also become a research area.

[0004] Electric motors are relatively mature products, and the integration of electric motors and reducers into reduction motors is also a mature product. However, existing reduction motors do not have a stall braking function and therefore cannot be directly used in excavator slewing systems that require precise control and safe braking. Utility Model Content

[0005] To address the above-mentioned defects or one of the defects of the prior art, the present invention provides an electric drive rotary motor. This new motor not only needs to provide power, but also needs to be able to quickly brake and stop when the handle returns to the neutral position to ensure the safety and accuracy of operation. To this end, the technical solution adopted by the present invention is:

[0006] An electric-driven rotary motor includes a motor and a reducer. Unlike the existing technology, the motor shaft of the motor is connected to the input shaft of the reducer through a hydraulic brake. When operating the excavator, when the handle returns to the neutral position, the motor loses power and the hydraulic brake locks the motor shaft or the input shaft or the coupling connecting the motor shaft and the input shaft.

[0007] Furthermore, the hydraulic brake includes a brake housing with a stepped inner cavity which is larger at the top and smaller at the bottom, a brake cover is installed at the upper end of the brake housing, and an annular piston which is stepped at the top and smaller at the bottom is fitted in the brake housing. An annular closed cavity is formed at the step between the brake housing and the annular piston, and a brake release oil port opened on the brake housing is communicated with the closed cavity. A plurality of springs are abutted between the brake cover and the annular piston, a plurality of inner friction plates are fixed to the motor shaft or the input shaft or the coupling, a plurality of outer friction plates are fixed to the brake housing, the plurality of inner friction plates and the plurality of outer friction plates are arranged alternately, and the lower end of the annular piston abuts against the inner friction plate or the outer friction plate of the topmost layer.

[0008] Furthermore, the friction surfaces of the inner friction plate and the outer friction plate are coated with wear-resistant material to extend the service life of the friction plates.

[0009] Furthermore, the wear-resistant material is a ceramic-based composite material to provide excellent wear resistance and high temperature resistance.

[0010] Furthermore, O-rings are installed between the upper and lower brake housings and the annular piston respectively.

[0011] Furthermore, the hydraulic brake further includes a brake control unit for controlling the opening or closing of the hydraulic oil entering the brake release oil port.

[0012] Furthermore, the brake control unit includes a solenoid valve for controlling the flow of hydraulic oil according to an electrical signal.

[0013] Furthermore, the coupling is a spline coupling.

[0014] Furthermore, a one-way valve is provided at the brake release oil port of the hydraulic brake to prevent the pressure oil from flowing back.

[0015] Furthermore, the one-way valve is designed to open automatically when the pressure oil reaches a preset pressure to ensure smooth release of the hydraulic brake.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are mainly reflected in the following aspects:

[0017] 1. Improved safety: The hydraulic brake's quick response allows the excavator to stop quickly when the operating handle returns to the neutral position, improving the safety of excavator operation and reducing the risk of accidents caused by untimely braking.

[0018] 2. Precise control: The design of the electric drive rotary motor allows for more precise control of the rotary motion, especially in situations where precise positioning and operation are required, such as operations in narrow spaces or delicate operations, thereby improving work efficiency and quality.

[0019] 3. Energy saving and high efficiency: The electrified design reduces dependence on the hydraulic system and reduces energy consumption. At the same time, due to the direct drive of electric energy, the energy conversion efficiency is improved, which meets the environmental protection requirements of energy conservation and emission reduction.

[0020] 4. Easy maintenance: The design of the hydraulic brake reduces the complexity of the traditional hydraulic system, reduces maintenance costs and failure rates, makes the equipment more reliable and reduces downtime.

[0021] 5. Operator comfort: Due to the smooth running characteristics of the electric motor, vibration and noise during operation are effectively controlled, improving the operator's comfort and work efficiency.

[0022] 6. Strong adaptability: The electric drive rotary motor is designed to adapt to different working environments and conditions, including high and low temperatures, high humidity and other harsh environments, enhancing the adaptability and reliability of the excavator.

[0023] 7. Technological Foresight: With the development of new energy technologies, electrification is the future trend of the construction machinery industry. The design of this utility model conforms to this trend and provides a technical foundation for the electrification transformation of excavators.

[0024] 8. Cost-effectiveness: Although the initial investment may be higher, the high efficiency and low maintenance requirements of the electric system can reduce operating costs and improve economic benefits in the long run.

[0025] 9. Environmentally friendly: Electric motors do not produce exhaust emissions, reducing pollution to the environment, meeting global requirements for reducing carbon emissions, and helping companies fulfill their social responsibilities.

[0026] 10. Easy to integrate: The electric drive swing motor can be easily integrated into the existing excavator design without the need for large-scale changes to the overall structure of the excavator, facilitating the transition and upgrade of new and old technologies.

[0027] In summary, the electric drive rotary motor of the present invention demonstrates significant technical advantages in terms of safety, precision, energy saving, maintenance, comfort, adaptability, technological foresight, cost-effectiveness and environmental friendliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of a specific embodiment.

[0029] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0033] like Figure 1 、 2 The electric drive rotary motor shown in the figure includes a motor 100 and a reducer 200. The motor shaft 101 of the motor 100 is connected to the input shaft 201 of the reducer 200 through a hydraulic brake 300. The hydraulic brake 300 includes a brake housing 301 with a stepped inner cavity with a larger upper portion and a smaller lower portion. A brake cover 302 is installed on the upper end of the brake housing 301. An annular piston 303 with a larger upper portion and a smaller lower portion is fitted in the brake housing 301. The step between the brake housing 301 and the annular piston 303 forms an annular The closed cavity 308, the brake release oil port 305 opened on the brake housing 301 is communicated with the closed cavity 308, a plurality of springs 304 are abutted between the brake cover 302 and the annular piston 303, a plurality of inner friction plates 306 are fixed to the coupling 120, a plurality of outer friction plates 307 are fixed to the brake housing 301, the plurality of inner friction plates 306 and the plurality of outer friction plates 307 are arranged alternately, and the lower end of the annular piston 303 abuts against the uppermost inner friction plate 306 or outer friction plate 307.

[0034] The working principle of the electric drive rotary motor can be briefly described as follows:

[0035] 1. Power transmission: The motor 100 transmits power through its motor shaft 101, which is connected to the input shaft 201 of the reducer 200 through the hydraulic brake 300. This connection allows power to be transmitted from the motor to the reducer, thereby driving the rotary motion of the excavator.

[0036] 2. Brake Structure: The hydraulic brake 300 comprises a brake housing 301 with a stepped interior cavity, larger at the top and smaller at the bottom. A brake cover 302 is mounted on the upper end of the housing. A similarly stepped annular piston 303 fits within the housing, forming an annular, sealed chamber 308 at the stepped junction between the piston and the housing.

[0037] 3. Braking Mechanism: The brake housing 301 is provided with a brake release port 305, which communicates with a sealed chamber 308. Multiple springs 304 abut against the brake cover 302 and the annular piston 303. In the absence of hydraulic oil pressure, these springs press the piston against the inner and outer friction plates 306 and 307, achieving braking.

[0038] 4. Friction Plate Arrangement: Multiple inner friction plates 306 are fixed to the coupling 120, while multiple outer friction plates 307 are fixed to the brake housing 301. These inner friction plates 306 and outer friction plates 307 are arranged alternately to form a friction pair.

[0039] 5. Braking and Release: When the excavator handle is in the working position, hydraulic oil enters the sealed chamber 308 through the brake release port 305, pushing the annular piston 303 upward. This compresses the spring 304, separating the annular piston 303 from the topmost inner friction plate 306 or outer friction plate 307, thereby releasing the brake and allowing the motor shaft 101 and input shaft 201 to rotate freely, allowing the excavator to swing. When the handle returns to the neutral position, the hydraulic oil pressure disappears, and the spring 304 presses the annular piston 303 back into position, causing the friction plates to come into close contact, generating friction that locks the motor shaft 101 and / or input shaft 201 and / or coupling 120, achieving a rapid stop.

[0040] 6. Quick response: This design enables the electric drive swing motor to respond quickly and stop rotating when the handle returns to the neutral position, improving the safety of excavator operation and the accuracy of control.

[0041] The electric drive swing motor of this embodiment achieves precise braking and releasing through the hydraulic control of the hydraulic brake, meeting the excavator's requirements for rapid braking and precise control during operation.

[0042] The hydraulic brake 300 is not limited to locking the coupling 120. In some other embodiments, the inner friction plate 306 can also be fixed to the motor shaft 101, or fixed to the input shaft 201 of the reducer 200. In this way, the hydraulic brake 300 can lock the motor shaft 101 or the input shaft 201 to achieve the function of Example 1.

[0043] In another preferred embodiment, the friction surfaces of the inner friction plate 306 and the outer friction plate 307 are coated with a wear-resistant material to extend the service life of the friction plates. The wear-resistant material is a ceramic-based composite material that provides excellent wear resistance and high temperature resistance.

[0044] In another preferred embodiment, O-rings 310 are installed between the upper and lower brake housings 301 and the annular piston 303 of the sealed cavity 308 , respectively.

[0045] In another preferred embodiment, the coupling 120 is a spline coupling.

[0046] In another preferred embodiment, the hydraulic brake 300 further includes a brake control unit for controlling the opening or closing of the hydraulic oil entering the brake release oil port 305. The brake control unit includes a solenoid valve for controlling the flow of the hydraulic oil according to an electrical signal.

[0047] In another preferred embodiment, the brake release port 305 of the hydraulic brake 300 is equipped with a one-way valve. Its primary function is to prevent hydraulic oil from flowing back when the system pressure decreases, thereby ensuring the stability and reliability of the hydraulic system of the hydraulic brake 300. The one-way valve is designed to automatically open when the pressurized oil reaches a preset pressure, ensuring the smooth release of the hydraulic brake 300, allowing the annular piston 303 to separate from the friction plate, thereby smoothly releasing the brake.

[0048] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

[0049] Any matters not described in detail in the present invention are prior art or common knowledge in the field.

Claims

1. An electric drive rotary motor, comprising a motor (100) and a reducer (200), characterized in that: The motor shaft (101) of the motor (100) is connected to the input shaft (201) of the reducer (200) via a hydraulic brake (300). When the excavator is operated, when the handle returns to a neutral position, the motor (100) loses power, and the hydraulic brake (300) locks the motor shaft (101) or the input shaft (201) or the coupling (120) connecting the motor shaft (101) and the input shaft (201).

2. The electric drive rotary motor according to claim 1, characterized in that: The hydraulic brake (300) comprises a brake housing (301) having a stepped inner cavity with a larger upper portion and a smaller lower portion, a brake cover (302) being installed on the upper end of the brake housing (301), an annular piston (303) with a larger upper portion and a smaller lower portion being fitted in the brake housing (301), an annular closed cavity (308) being formed at the step between the brake housing (301) and the annular piston (303), a brake release oil port (305) being opened on the brake housing (301) being in communication with the closed cavity (308), and the brake A plurality of springs (304) are abutted between the cover (302) and the annular piston (303); a plurality of inner friction plates (306) are fixed to the motor shaft (101) and / or the input shaft (201) and / or the coupling (120); a plurality of outer friction plates (307) are fixed to the brake housing (301); the plurality of inner friction plates (306) and the plurality of outer friction plates (307) are arranged alternately; the lower end of the annular piston (303) abuts against the uppermost inner friction plate (306) or outer friction plate (307).

3. The electric drive rotary motor according to claim 2, characterized in that: The friction surfaces of the inner friction plate (306) and the outer friction plate (307) are coated with wear-resistant material.

4. The electric drive rotary motor according to claim 3, characterized in that: The wear-resistant material is a ceramic-based composite material.

5. The electric drive rotary motor according to claim 2, characterized in that: O-type sealing rings (310) are respectively installed between the upper and lower brake housings (301) and the annular piston (303) of the sealed cavity (308).

6. The electric drive rotary motor according to claim 2, characterized in that: The hydraulic brake (300) further comprises a brake control unit for controlling the opening or closing of hydraulic oil entering the brake release oil port (305).

7. The electric drive rotary motor according to claim 6, characterized in that: The brake control unit includes a solenoid valve for controlling the flow of hydraulic oil according to an electrical signal.

8. The electric drive rotary motor according to claim 1, characterized in that: The coupling (120) is a spline coupling.

9. The electric drive rotary motor according to claim 1, characterized in that: The brake release oil port (305) of the hydraulic brake (300) is provided with a one-way valve.

10. The electric drive rotary motor according to claim 9, characterized in that: The one-way valve is designed to open automatically when the pressure oil reaches a preset pressure.

Images