CN218882931U

CN218882931U - Hydraulic cycloidal pin gear meshing pair

Info

Publication number: CN218882931U
Application number: CN202223177337.9U
Authority: CN
Inventors: 焦文瑞; 候巍; 李佳伟
Original assignee: Zhenjiang Hydraulics Co ltd
Current assignee: Zhenjiang Hydraulics Co ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-04-18
Anticipated expiration: 2032-11-29

Abstract

The utility model relates to a hydraulic pressure cycloid pinwheel meshing is vice belongs to hydraulic transmission technical field. This meshing is vice including six tooth cycloid wheels and seven tooth pin wheels of meshing each other, its characterized in that: the eccentricity of the cycloid wheel and the pin wheel is 3.9mm, the radius of a distribution circle of a meshing pair of the cycloid pin wheel is 48mm, the radius of pin teeth of the pin wheel is 21 mm, and the minimum curvature radius of the tooth profile of the cycloid wheel is 1mm. Adopt the utility model discloses not only effectively improved the unit discharge capacity after, can satisfy the user demand conscientiously to avoid "distortion", improve hydraulic system pressure, guaranteed the meshing performance, and the manufacturability is good.

Description

Hydraulic cycloidal pin gear meshing pair

Technical Field

The utility model relates to a cycloidal pin gear meshing is vice, especially a hydraulic pressure cycloidal pin gear meshing is vice belongs to hydraulic transmission technical field.

Background

To the knowledge of the applicant, the cycloidal-pin gear meshing pair used in the existing domestic full hydraulic steering gear generally uses mapping parameters of the same type of foreign products, as shown in fig. 1: the cycloidal gear has the advantages of 6 teeth, 7 teeth, 3.8mm eccentricity, 34mm radius of a distribution circle, 11.1mm radius of pin teeth, 0.78 calculated short amplitude coefficient, 0.812mm minimum curvature radius of the cycloidal gear tooth profile and 7.6mL/mm unit length displacement.

There are three problems with this set of parameters in actual use: firstly, the unit length displacement is small, and the development and change of the use requirement caused by the technological progress are difficult to meet; secondly, in the meshing process of the cycloid pair, as the minimum curvature radius of a cycloid tooth profile is too small, the wear of the cycloid wheel is fast, and the wear of the cycloid wheel cannot be compensated and cannot bear a 25MPa hydraulic nominal pressure series, so that the service life of the cycloid pair is shortened; secondly, in the manufacturing process, the minimum curvature radius of the tooth profile of the cycloidal gear is too small, so that the cycloidal gear is difficult to machine, and in the forming grinding process, the tooth profile of the cycloidal gear at the minimum curvature radius can not be machined frequently along with the abrasion of a diamond roller; in addition, in the process of matching of the cycloidal pin gear meshing pair, the minimum curvature radius of the tooth profile of the cycloidal gear is too small, the radial clearance of the cycloidal pair is difficult to match to the requirements of a drawing, and uneven torque is easy to occur in the process of testing the torque of a rotor.

Disclosure of Invention

The utility model aims to provide a: aiming at the problems in the prior art, the hydraulic cycloid pinwheel meshing pair which can meet the requirement of high unit displacement in the market and ensure the meshing performance and manufacturability is provided by repeatedly optimizing reasonable structural parameters.

In order to achieve the above object, the applicant has conducted intensive studies theoretically. According to the theoretical displacement calculation formula of the cycloidal motor (Zulanyi, qin and Vie ' the calculation of performance parameters of the cycloidal pin gear meshing pair ' Jilin ' Industrial Medite 1986 (1): 81-91), it can be known that, in order to increase the displacement of 7.6mL/mm in the prior art to 9.4mL/mm which is required by use, not only the eccentric distance between the cycloidal gear and the pin gear, the radius of the distributed circle of the cycloidal pin gear meshing pair and the radius of the pin gear need to be reasonably matched and changed, but also the tooth profile distortion phenomenon needs to be avoided according to the calculation formula of the curvature radius of the theoretical tooth profile curve of the cycloidal gear. For example, when the radius of curvature of the tooth profile is reduced by changing parameters, the contact stress of the tooth surface is increased, the contact part is easy to wear, and otherwise, the tooth profile is easy to generate distortion, the meshing quality is influenced, and the closed cavities cannot be well meshed and leak oil. Therefore, the reasonable selection and matching of each parameter need to be repeatedly considered. After repeated selection, calculation and experimental verification, the applicant determines the following preferred technical scheme for forming a new generation of normalized products: a hydraulic cycloid pin gear meshing pair comprises a six-tooth cycloid gear and a seven-tooth pin gear which are meshed with each other, wherein the eccentricity of the cycloid gear and the pin gear is 3.9mm, the radius of a distributed circle of the cycloid pin gear meshing pair is 48mm, and the radius of a pin gear of the pin gear is 21 mm.

Adopt the utility model discloses not only effectively improved the unit discharge capacity after, can satisfy the user demand conscientiously to avoid "distortion", guaranteed the meshing performance, and the manufacturability is good.

The utility model discloses further perfect is: on the basis of the optimized technical scheme, further optimized parameters are determined, wherein the tooth profile short-amplitude coefficient of the cycloidal gear is 0.57, the minimum curvature radius is 1mm, and the unit length displacement is 9.4mL/mm.

The utility model discloses further perfection is again: each pin tooth circular arc surface of the pin wheel is provided with a high-frequency quenching layer with the thickness of 1-1.5mm, so that the wear resistance is further improved, and the service life is prolonged.

The utility model discloses further perfect is: the end face of the pinwheel is provided with a sealing caulking groove with a rectangular section. This is beneficial for reducing hydraulic leakage from the gerotor gear mesh pairs,

the utility model discloses still further perfect is: the inner hole of the cycloid wheel is composed of a straight hole section and an inner spline section, wherein the straight hole section and the inner spline section extend towards two ends of the middle of the inner hole respectively. The structure is beneficial to the reasonable design of the axial length, thereby reducing the length of the matched hydraulic steering gear.

Drawings

Fig. 1 is a schematic diagram of a prior art structure.

Fig. 2 is a schematic diagram of an embodiment of the present invention.

Fig. 3 is a schematic diagram of the pinwheel structure of the embodiment of fig. 2.

Fig. 4 is a schematic cross-sectional structure of fig. 3.

Figure 5 is a schematic view of the cycloidal wheel structure of the embodiment of figure 2.

Fig. 6 is a schematic cross-sectional structure view of fig. 5C-C.

Fig. 7 is a partially enlarged schematic view of a portion a of fig. 3.

Fig. 8 is a partially enlarged structural view at B of fig. 4.

Fig. 9 is a continuous contact pressure profile of the embodiment of fig. 2.

FIG. 10 is a graph of the wear strength of the cycloidal gear of the embodiment of FIG. 2.

FIG. 11 is a graph of the pinwheel wear strength of the embodiment of FIG. 2.

Detailed Description

Example one

The embodiment is a hydraulic cycloid pin gear meshing pair applied to a hydraulic steering gear, and as shown in fig. 2, the hydraulic cycloid pin gear meshing pair comprises a six-tooth cycloid gear 1 and a seven-tooth pin gear 2, the eccentricity of the cycloid gear 1 and the pin gear 2 is 3.9mm, the radius of a distributed circle of the cycloid pin gear meshing pair is 48mm, the radius of a pin tooth of the pin gear 2 is 21 mm, and the minimum curvature radius of a cycloid gear tooth profile is 1mm.

As shown in figures 3, 7 and 8, the end face of the pin wheel 2 is provided with a sealing caulking groove 2-1 with a rectangular section, and the arc surface of each pin tooth is provided with a high-frequency quenching layer with the thickness of 1-1.5 mm. The inner hole of the cycloid wheel 1 is composed of a straight hole section 1-2 and an inner spline section 1-1, wherein the straight hole section and the inner spline section extend towards two ends respectively from the middle part.

After the embodiment is applied to a matched hydraulic steering gear, the discharge capacity is improved to 9.4mL/mm through tests, the use requirement can be met practically, the minimum curvature radius of 1mm can be calculated and calculated, the tooth profile distortion phenomenon can be avoided completely, the short-amplitude coefficient is effectively reduced, the test condition is ideal, and the analysis of the graphs in figures 9, 10 and 11 shows that the embodiment also reduces the stress of a cycloidal pin gear meshing pair, reduces the contact stress and the abrasion of a cycloidal gear, and eliminates uneven moment; in addition, the service life of the high-frequency quenching treatment is obviously prolonged, and a matched product which meets the requirements of scientific and technological progress development is successfully completed.

Summarizing, this embodiment has the following significant advantages:

1) The contact stress and the abrasion coefficient of a cycloidal pin gear meshing pair are reduced, the abrasion resistance of the cycloidal gear is effectively improved, the hydraulic pressure high-pressure bearing capacity is improved, and the service life is greatly prolonged;

2) The grinding processing problem is properly solved, the grinding qualification rate of the cycloid wheel is greatly improved, the hydraulic internal leakage of the cycloid pin wheel meshing pair is reduced, and the hydraulic service performance of the cycloid pin wheel meshing pair is effectively improved;

3) The length displacement of the cycloidal-pin gear meshing pair is improved, the length of the full-hydraulic steering gear is reduced, and the cost is reduced.

In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims

1. The utility model provides a hydraulic pressure cycloid pin gear meshing pair, includes six tooth cycloid wheels and seven tooth pin gears that mesh each other, its characterized in that: the eccentricity of the cycloid wheel and the pin wheel is 3.9mm, the radius of a distribution circle of the meshing pair of the cycloid pin wheel is 48mm, and the radius of the pin teeth of the pin wheel is 21 mm.

2. The hydraulic gerotor pinwheel engagement set of claim 1, further comprising: the tooth profile short-amplitude coefficient of the cycloid wheel is 0.57, the minimum curvature radius is 1mm, and the unit length displacement is 9.4mL/mm.

3. The hydraulic gerotor pinwheel engagement set of claim 2, further comprising: each pin tooth circular arc surface of the pin wheel is provided with a high-frequency quenching layer with the thickness of 1-1.5 mm.

4. The hydraulic gerotor pinwheel engagement set of claim 3, further comprising: the end face of the pinwheel is provided with a sealing caulking groove with a rectangular section.

5. The hydraulic gerotor pinwheel engagement set of claim 4, wherein: the inner hole of the cycloid wheel is composed of a straight hole section and an inner spline section, wherein the straight hole section and the inner spline section extend towards two ends of the middle of the inner hole respectively.