CN203703018U - Drum-shaped cycloid gear structure - Google Patents

Abstract

The utility model discloses a drum-shaped cycloidal gear structure, which comprises a cycloidal wheel meshing with a group of ring-arranged pin teeth on a pin wheel, and the gear teeth on the outer peripheral tooth surface of the cycloidal wheel form a drum-shaped surface convex in the middle. , correspondingly, the middle part of the pin teeth cooperates with the gear teeth to form a concave curved surface. The pin teeth form a concave drum shape in the middle, and the generatrix of the pin teeth is a concave curve. The cross-sections of the tooth profiles are all circles, but the radius of the circle changes along the axial direction. The cycloidal gear of the utility model has a large contact area with the needle teeth, uniform force, high transmission efficiency of the cycloidal gear and long service life.

Description

A drum-shaped cycloidal gear structure

technical field

The utility model relates to the technology of a speed reducer, in particular to a drum-shaped cycloid gear structure.

Background technique

The transmission mechanism in the existing pendulum pin wheel reducer usually adopts the planetary transmission mode of internal meshing, see Figure 1, the transmission mechanism includes: input shaft 11, eccentric sleeve 12, pin gear pin 13, pin gear sleeve 14, cycloid wheel 15, output shaft 16, column pin 17, column sleeve 18. The Z _H pin gear pins 13 are respectively socketed with a pin gear sleeve 14, and are distributed and fixed at an equiangular circumference according to the preset pin wheel pitch circle radius. In this way, the Z _H pin gear sleeves 14 constitute a The pin wheel of the center wheel, and the center of the pin wheel is aligned with the axes of the input shaft 11 and the output shaft 16. The cycloidal wheel 15 is used as a planetary gear of the planetary transmission, and has Z _c teeth for multi-teeth meshing with the pin gear sleeve 14 . The center of the cycloidal wheel 15 has a first circular hole, one end of the eccentric sleeve 12 used as a planet carrier is inserted into the first circular hole through a bearing (not shown in the figure), and the other end of the eccentric sleeve 12 is sleeved On the input shaft 11, so as to realize the eccentric connection between the cycloid wheel 15 and the output shaft 16.

In this way, when the input shaft 11 rotates positively around its axis at an angular velocity n, the cycloidal wheel 15 or driven by the eccentric sleeve 12 makes a circular motion around the axis of the input shaft 11, and through its cycloidal teeth and the needle gear sleeve 14 The multi-tooth meshes and rotates, so that the output shaft 16 is driven to reverse rotation at an angular velocity n/Z _c through the column sleeve 18 and the column pin 17 on the output shaft 16 connecting the disk 19.

In the above-mentioned existing cycloidal pin gear reducer, the cycloidal gear meshes with a group of circularly arranged needle teeth (needle pins) on the pin gear to form an internal meshing reduction mechanism with a tooth difference of one tooth (in order to reduce Friction, in a reducer with a small speed ratio, the needle teeth have a needle gear sleeve), and the speed reduction is achieved through its transmission mechanism. For the traditional cycloidal gear rotation mechanism, the tooth profile of the pin wheel is a cylindrical surface, as shown in Figure 2, the pin tooth pin 13 and the pin tooth sleeve 14 that is socketed are cylindrical, and the cycloid wheel 15 forms a matching The gear driven by the cylindrical pin wheel forms a wavy arc-shaped plane, so that the gear teeth on the cycloid wheel are respectively meshed with the cylindrical pin teeth for transmission. For the cylindrical needle tooth structure, the contact area between the cycloid gear and the needle teeth is small, the transmission efficiency of the cycloid gear is average, and the service life is short. In view of the flaws caused by the incomplete structural design of the above-mentioned needle wheel, the designer made in-depth ideas, and actively researched and improved the trial production to develop and design this creation.

Utility model content

The purpose of the utility model is to provide a drum-shaped cycloidal gear structure, the cycloidal gear has a large contact area with the pin teeth, the force is uniform, and the cycloidal gear has high transmission efficiency and long service life.

In order to achieve the above object, the solution of the present utility model is:

A drum-shaped cycloidal gear structure, including a cycloidal wheel meshing with a group of circularly arranged pin teeth on the pin wheel, the gear teeth on the outer peripheral tooth surface of the cycloidal wheel form a drum-shaped surface convex in the middle, and correspondingly, the needle The middle part of the tooth cooperates with the gear teeth to form a concave curved surface.

The pin teeth form a concave drum shape in the middle, and the generatrix of the pin teeth is a concave curve, and the cross sections of the tooth profiles are all circles, but the radius of the circle changes along the axial direction.

After adopting the above structure, compared with the general gear transmission, the drum-shaped cycloid gear structure of the utility model has the following characteristics: ①Small contact stress and uniform wear; ②The coincidence degree of the tooth profile is relatively large and the bending strength is large; ③The structure is compact, and a larger transmission ratio can also be obtained. 

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of an exploded state of a transmission structure in an existing cycloidal pinwheel reducer;

Fig. 2 is a schematic diagram of the structure of the existing cycloidal wheel and pin teeth;

Fig. 3 is the structural representation of the utility model;

Fig. 4 is the structural representation of the utility model;

Fig. 5 is a schematic side view of the utility model.

Detailed ways

In order to further explain the technical solution of the utility model, the utility model is described in detail through specific examples below.

The main improvement of the utility model lies in the cooperation of the cycloid wheel and the needle teeth in the cycloid gear structure, as shown in Fig. 3 to Fig. The pin teeth 3 are meshed. In the utility model, each gear tooth 21 on the outer peripheral tooth surface of the cycloid wheel 2 forms a drum-shaped surface convex in the middle, and the gear teeth 21 all form a curved surface of the drum-shaped side wall. Correspondingly, the middle part of the pin teeth 3 is matched with the wheel The teeth 21 form a concave curved surface. The needle teeth 3 can correspond to form a concave drum-shaped structure in the middle, wherein the generatrix of the needle teeth 3 is a concave curve, and the cross-sections of the tooth profiles of the needle teeth 3 are all circular, but the radius of the circle changes along the axial direction, so that it is consistent with The drum-shaped gear teeth 21 on the cycloidal wheel 2 are engaged in side engagement.

The gear tooth 21 of the cycloid wheel adopts the outer convex drum-shaped surface in the middle, and the side surface of the pin tooth 3 meshing with it is matched with the drum-shaped curved surface to fit and contact with the situation, which is consistent with the cylindrical surface in the traditional cycloid gear rotation The tooth profiles of the pin wheels are different, the structure side of the cycloid wheel 2 protrudes outward, and the generatrices of the corresponding pin teeth 3 are concave curves. With such a matching structure, under the same thickness, the contact area between the drum-shaped cycloid gear and the pin teeth 3 is larger than that of the ordinary cycloid gear, so the force is uniform and the wear is small. High transmission efficiency and long service life. Theoretically, it can realize meshing without backlash in the strict sense, so it has the characteristic of "zero" backlash. The drum-shaped cycloidal pin wheel planetary transmission has a large coincidence degree, a large bearing capacity, and high meshing rigidity.

To sum up, compared with general gear transmission, the utility model has the following characteristics: ①Small contact stress and uniform wear; ②The coincidence degree of the tooth profile is relatively large and the bending strength is large; ③The structure is compact and a large transmission ratio can also be obtained. .

The above-mentioned embodiments and drawings do not limit the product form and style of the present utility model, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present utility model.

Claims (2)

1. a cydariform cycloidal gear structure, comprises that cycloid wheel is meshed with the pin tooth of one group of annular array on pinwheel, is characterized in that: the gear teeth on the cycloid wheel periphery flank of tooth form the cydariform face of middle part evagination, corresponding, pin tooth middle part match wheel tooth forms inner sunken face.

2. a kind of cydariform cycloidal gear structure as claimed in claim 1, is characterized in that: pin tooth forms the cydariform of middle part indent, and the bus of pin tooth is inner concave curve, and the cross section of flank profil is circle, and just circle radius changes vertically.