Axial dimension is small shaft hydraulic motor of axial flow

Abstract

The application relates to the technical field of hydraulic motor products, in particular to a shaft distribution flow trochoidal hydraulic motor with a short axial size, which reduces performance loss while reducing the size of the motor and meets use requirements, and comprises a shell and an output shaft, the outer wall of the output shaft is uniformly distributed with a distribution flow groove and a distribution flow hole, the inner wall of the shell is provided with a radial groove matched with the distribution flow groove, characterized in that the axial length of the distribution flow part of the shell is reduced to 55-60% of the original length, the axial length of the output shaft is reduced to 55 mm, the area of the distribution flow groove is reduced to 60 mm 2 , the axial distribution flow sealing strip size matched with the output shaft on the inner wall of the shell is reduced to 5-6 mm, a double-lip dustproof ring is installed at the journal of the output shaft, and a dustproof lip and an oil seal lip are arranged on the inner side of the double-lip dustproof ring.

Description

Technical Field

[0001] This invention relates to the field of hydraulic motor product technology, specifically to a shaft-distributed cycloidal hydraulic motor with a short axial dimension. Background Technology

[0002] The shaft-distributed cycloidal hydraulic motor is a medium-speed, medium-torque internal meshing cycloidal gear hydraulic motor with shaft distribution. It features an integrated design of the output shaft and distribution mechanism. Core components include a geared stator and rotor, double rolling bearings, and specialized seals, enabling stable operation under high back pressure conditions. When installation space is limited, a significant reduction in the motor's axial dimension is necessary to meet requirements. Traditionally, this involves selecting a small-displacement motor. While a slightly smaller displacement might barely meet performance needs, the axial dimension reduction is limited, making installation at the customer's site impossible. Conversely, if the displacement is too small, its performance (torque, speed, etc.) will fail to meet customer requirements. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a shaft-distributed cycloidal hydraulic motor with a short axial dimension, which reduces motor size while minimizing performance loss, thus meeting usage requirements.

[0004] The technical solution is as follows: A cycloidal hydraulic motor with a short axial dimension includes a housing and an output shaft. The outer wall of the output shaft is evenly distributed with distribution grooves and distribution holes. The inner wall of the housing is provided with radial grooves that mate with the distribution grooves. The characteristic feature is that the axial length of the distribution portion of the housing is reduced to 55-60% of its original length, the axial length of the output shaft is reduced to 55mm, and the area of ​​the distribution grooves is reduced to 60mm². 2 The size of the axial flow distribution sealing strip that mates with the output shaft on the inner wall of the housing is reduced to 5-6 mm. A double-lip dustproof ring is installed at the journal of the output shaft, and the inner side of the double-lip dustproof ring is provided with a dustproof lip and an oil seal lip.

[0005] A further feature is that the housing is provided with a curved casting flow channel.

[0006] By adopting this invention, the axial dimensions of the output shaft and the housing distribution section are shortened, and the dimensions of the sealing strip and oil distribution groove are reasonably allocated. While reducing the axial dimension, no additional pressure loss is generated, so that the motor torque performance meets customer requirements. Furthermore, a double-lip dustproof ring is selected, thereby eliminating the need for a dustproof ring and ultimately reducing the axial dimension of the housing to meet installation requirements. In addition, a curved cast flow channel is adopted inside the housing, which solves the problem of difficult flow channel machining while reducing the axial dimension. Attached Figure Description

[0007] Figure 1 Schematic diagram of the structure of this invention; Figure 2This is a longitudinal cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the shaft seal structure; Figure 4 This is a schematic diagram of the internal flow channel structure; Figure 5 This is a schematic diagram of the output shaft structure. Detailed Implementation

[0008] See Figures 1-5 As shown, a cycloidal hydraulic motor with a short axial dimension includes a housing 1 and an output shaft 2. Distribution grooves 3 are evenly distributed on the outer wall of the output shaft 2, and radial grooves that mate with the distribution grooves 3 are provided on the inner wall of the housing 1. The axial length of the distribution portion of the housing 1 is reduced to 55-60% of its original length, the axial length of the output shaft 2 is reduced by 34.5 mm to 55 mm, and the area of ​​the distribution grooves 3 is reduced to 60 mm². 2 By rationally designing the flow area, the axial dimension is reduced without generating additional pressure loss, so that the motor torque performance can meet customer needs.

[0009] Because there is a diameter gap of approximately 0.03mm between the output shaft 2 and the housing 1, some internal leakage will exist axially between the high and low pressure distribution areas. However, according to the gap flow formula, if there is a certain sealing width between the high and low pressure areas, the internal leakage can be controlled within a small range. Similarly, considering the customer's requirements for internal leakage, reducing the size of the axial distribution seal strip that mates with the output shaft on the inner wall of the housing by a reasonable value (5~6mm) can simultaneously meet the requirements for shortening the axial dimension and the customer's requirements for motor speed performance.

[0010] Existing motor designs require a dust seal ring at the output shaft journal to prevent dust and other contaminants from contacting the shaft seal lip, which could wear down the shaft or seal, leading to seal failure and oil leakage. In this application, a double-lip dust seal ring 5 is installed at the output shaft journal. The inner surface of the double-lip dust seal ring 5 has a dust seal lip and an oil seal lip, serving to prevent dust and seal high-pressure oil. This does not increase the axial dimension of the shaft seal and can reduce the axial dimension of the motor by approximately 7mm.

[0011] Finally, previously, the flow channel could be machined by inserting a drill bit into the oil port of the housing to ensure the corresponding position of the flow channel and the shaft distribution groove. However, when the axial length of the shaft and housing is shortened, problems such as interference and wall thickness perforation make it impossible to machine the flow channel with a drill bit. Therefore, a curved cast internal flow channel 4 is used to replace straight drilling to solve the related problems.

Claims

1. A cycloidal hydraulic motor with a short axial dimension, comprising a housing and an output shaft, wherein the outer wall of the output shaft is evenly distributed with distribution grooves and distribution holes, and the inner wall of the housing is provided with radial grooves that mate with the distribution grooves, characterized in that, The axial length of the distribution section of the housing is reduced to 55-60% of its original length, the axial length of the output shaft is reduced to 55 mm, and the area of ​​the distribution groove is reduced to 60 mm². 2 The size of the axial flow distribution sealing strip that mates with the output shaft on the inner wall of the housing is reduced to 5-6 mm. A double-lip dustproof ring is installed at the journal of the output shaft, and the inner side of the double-lip dustproof ring is provided with a dustproof lip and an oil seal lip.

2. The axially compact cycloidal hydraulic motor according to claim 1, characterized in that, The shell is provided with a curved casting flow channel.

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