Cycloid hydraulic motor with high power density and high rotating speed

Abstract

The utility model discloses a cycloid hydraulic motor with high power density and high rotating speed, which comprises a transmission shaft, and a mechanical seal combination, a spring and a cycloid rotor and stator pair are sequentially arranged on the transmission shaft. The mechanical sealing assembly comprises a mechanical sealing static ring and a mechanical sealing moving ring; the cycloid rotor and stator pair comprises a floatable outer rotor and an inner rotor, and the inner rotor is connected with the transmission shaft through a connecting pin. The novel structure is adopted to break through the high rotating speed limit of a common cycloid hydraulic motor product, hydraulic energy is converted into mechanical energy through the special cycloid rotor-stator pair, and finally torque and rotating speed are output; the rotor has the characteristics of small volume and mass, high efficiency, low heat productivity, good high-pressure rotating sealing performance and rotating speed of 5000r / min.

Description

Technical Field

[0001] The utility model relates to a cycloidal hydraulic motor, in particular to a cycloidal hydraulic motor with high power density and high speed. Background Art

[0002] The traditional cycloidal hydraulic motor is a low-speed and high-torque motor, which has a great influence on the use of mobile and portable transmission hydraulic systems (such as plant protection machinery and power tools with high-speed requirements) due to its low speed characteristic.

[0003] Therefore, it is necessary to develop a new type of cycloidal hydraulic motor with high power density and high speed specifically to break through the speed limit of the traditional cycloidal hydraulic motor. Summary of the Utility Model

[0004] Purpose of the Utility Model: Aiming at the deficiencies and defects of the prior art, the utility model provides a cycloidal hydraulic motor with high power density and high speed, which adopts a new structure to break through the high-speed limit of ordinary cycloidal hydraulic motor products. The special cycloidal rotor-stator pair converts hydraulic energy into mechanical energy, and finally outputs torque and speed; it has the characteristics of small volume and mass, high efficiency, less heat generation, good high-pressure rotary sealing performance and a speed of 5000 r / min.

[0005] Technical Solution: A cycloidal hydraulic motor with high power density and high speed of the utility model is characterized in that: it includes a transmission shaft, on which a mechanical seal assembly, a spring and a cycloidal rotor-stator pair are successively arranged; the mechanical seal assembly includes a mechanical seal static ring and a mechanical seal dynamic ring; the cycloidal rotor-stator pair includes a floating outer rotor and an inner rotor, and the inner rotor is connected to the transmission shaft through a connecting pin.

[0006] Among them, the number of teeth of the inner rotor is more than 6, and the number of teeth of the floating outer rotor is more than 7.

[0007] Among them, the cycloidal rotor-stator pair is fixedly connected to the transmission shaft through a transmission pin.

[0008] Among them, one side of the cycloidal rotor-stator pair is connected to the front cover through an intermediate body and a mechanical seal assembly, and the other side of the cycloidal rotor-stator pair is connected to the rear cover.

[0009] Among them, an oil inlet and an oil return port are arranged on the rear cover.

[0010] Among them, the spring is a self-compensating spring.

[0011] Among them, a needle roller bearing is arranged on the side of the transmission shaft.

[0012] Beneficial effects: Compared with the prior art, the present utility model has the following remarkable advantages: The present utility model provides a special cycloid hydraulic motor with a small volume and mass, high efficiency, low heat generation, good high-pressure rotary sealing performance, and a rotational speed of 5000 r / min. The reliability of axial sealing is ensured by a mechanical seal method with self-compensation, reducing the leakage of the shaft seal front cover; the special cycloid rotor-stator pair reduces the processing difficulty, and a new type of flow distribution system enables it to have the advantage of high-speed movement. Therefore, it has a rotational speed of a traditional motor and is a high-speed cycloid motor with the smallest volume and mass, high efficiency, and low heat generation. Thus, it is widely used in mobile and portable transmission hydraulic systems. Brief Description of the Drawings

[0013] Figure 1 is a structural schematic diagram of the present utility model Figure 1 ;

[0014] Figure 2 is a structural schematic diagram of the present utility model Figure 2 ;

[0015] Figure 3 is a structural schematic diagram of the transmission shaft of the present utility model;

[0016] Figure 4 is the usage state of the present utility model Figure 1 ;

[0017] Figure 5 is the usage state of the present utility model Figure 2 ;

[0018] In the figure, 1 is the rear cover; 2 is the cycloid rotor-stator pair; 3 is the intermediate body; 4 is the mechanical seal combination; 5 is the front cover; 6 is the spring; 7 is the transmission shaft; 8 is the needle roller bearing; 9 is the transmission pin; 10 is the mechanical seal stationary ring; 11 is the mechanical seal rotating ring; 12 is the floating outer rotor; 13 is the inner rotor; 14 is the connecting pin. Detailed Embodiment

[0019] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and the detailed embodiment.

[0020] The cycloid hydraulic motor with a large power density and high rotational speed of the present utility model includes a transmission shaft 7, on which a mechanical seal combination 4, a spring 6, and a cycloid rotor-stator pair 2 are successively arranged; the mechanical seal combination 4 includes a mechanical seal stationary ring 10 and a mechanical seal rotating ring 11; the cycloid rotor-stator pair 2 includes a floating outer rotor 12 and an inner rotor 13, and the inner rotor 13 is connected to the transmission shaft 7 through a connecting pin 14.

[0021] Among them, the number of teeth of the inner rotor 13 is more than 6, and the number of teeth of the floating outer rotor 12 is more than 7; or other more teeth. The cycloid rotor-stator pair 2 is fixedly connected to the transmission shaft 7 through the transmission pin 9. One side of the cycloid rotor-stator pair 2 is connected to the front cover 5 through the intermediate body 3 and the mechanical seal assembly 4, and the other side of the cycloid rotor-stator pair 2 is connected to the rear cover 1. The rear cover 1 is provided with an oil inlet and an oil return port. The front cover 5 can have various different mounting flanges and various different shaft extensions of the transmission shaft. The spring 6 is a self-compensating spring. A needle roller bearing 8 is provided on the side of the transmission shaft 7.

[0022] During use, when oil enters from the motor oil port, under the action of the oil pressure, the rotor-stator pair makes its inner rotor roll at a speed ratio along the outer rotor. Its oil inlet and return oil cavities are constantly changing, but are always divided into two sides by the eccentric distance center line. One side is for oil inlet, and the cavity volume gradually increases; and this rotation is transmitted to the transmission shaft for output, thus realizing the conversion of hydraulic energy into mechanical energy; the other side discharges oil, and the volume gradually decreases, squeezing out the oil, passing through the oil distribution mechanism, and then discharging it to the fuel tank through the oil outlet of the oil motor.

[0023] In the rear cover of the utility model, an oil inlet and an oil return port are made. The oil inlet and oil return port can be at the bottom or at both ends according to the installation requirements of the customer. With a fixed eccentric distance and a new oil distribution mechanism, a special cycloid rotor-stator pair is installed at the large surface end of the rear cover. The inner rotor of the rotor-stator pair is fixedly connected to the transmission shaft through the transmission pin, and then connected to the front cover through the intermediate body and the mechanical seal. When the pressure oil is input through the working oil port A, the A oil cavity enters high-pressure oil. Under the action of the oil pressure, while the inner rotor and the transmission shaft rotate around their own axes, because the outer rotor is floating, it makes a high-speed reverse revolution. The tooth space volume of the A oil cavity increases and is the high-pressure cavity, and the tooth space volume of the B oil cavity decreases and is the oil discharge cavity. Each tooth space cavity completes an oil inlet and oil return cycle during one revolution, and this rotation is transmitted to the transmission shaft for output, thus realizing the conversion of hydraulic energy into mechanical energy; conversely, the performance is opposite.

[0024] The innovative point of this utility model lies in that a mechanical sealing device is installed at the front cover. When the motor works, the sealing dynamic ring moves together with the transmission shaft and generates friction with the static ring. At the same time, the spring at the back always presses against it to generate a self-compensating force, ensuring the reliability of axial sealing and reducing axial leakage. In the traditional cycloidal hydraulic motor, the stator is fixed. When the rotor rotates in the inner cavity of the stator, in order to ensure the flexible rotation of the rotor, there must be a certain axial clearance between the rotor and the stator. However, the requirement for this axial clearance is extremely strict. If the clearance is too large, the internal leakage of the motor is large and the volumetric efficiency is poor. If the clearance is small, it is difficult for the rotor to rotate, the mechanical resistance increases, the mechanical efficiency is low, and even the rotor cannot rotate in the inner cavity of the stator, resulting in the motor not working. By using a special cycloidal rotor-stator pair, this kind of axial clearance difference between the rotor and the stator does not need to exist, thus greatly reducing the difficulty of paired grinding and machining of the rotor and stator. Moreover, the rotor-stator pair is installed in the rear cover and connected to the intermediate body, canceling traditional parts such as spacer discs and stator sleeves and output shafts. The new flow distribution system gives it the advantage of high-speed movement, so it has a rotational speed several times that of the traditional motor and is a high-speed cycloidal motor with the smallest volume, the lightest mass, high efficiency, and less heat generation.

Claims

1. A cycloidal hydraulic motor with high power density and high rotational speed, characterized in that: It includes a transmission shaft (7), on which a mechanical seal assembly (4), a spring (6) and a cycloid rotor-stator pair (2) are successively arranged; the mechanical seal assembly (4) includes a mechanical seal stationary ring (10) and a mechanical seal rotating ring (11); the cycloid rotor-stator pair (2) includes a floating outer rotor (12) and an inner rotor (13), and the inner rotor (13) is connected to the transmission shaft (7) through a connecting pin (14).

2. The cycloid hydraulic motor with high power density and high speed according to claim 1, wherein: The number of teeth of the inner rotor (13) is more than 6, and the number of teeth of the floating outer rotor (12) is more than 7.

3. The cycloidal hydraulic motor with high power density and high rotational speed according to claim 1, characterized in that: The cycloid rotor-stator pair (2) is fixedly connected to the transmission shaft (7) through a transmission pin (9).

4. The cycloidal hydraulic motor with high power density and high rotational speed according to claim 1, characterized in that: One side of the cycloid rotor-stator pair (2) is connected to the front cover (5) through an intermediate body (3) and a mechanical seal assembly (4), and the other side of the cycloid rotor-stator pair (2) is connected to the rear cover (1).

5. The cycloidal hydraulic motor with high power density and high rotational speed according to claim 4, characterized in that: The rear cover (1) is provided with an oil inlet and an oil return port.

6. The cycloid hydraulic motor with high power density and high speed according to claim 1, characterized in that: The spring (6) is a self-compensating spring.

7. The cycloidal hydraulic motor with high power density and high rotational speed according to claim 1, wherein: A needle roller bearing (8) is provided on the side of the transmission shaft (7).

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