CN203703051U - Concave cycloidal gear structure - Google Patents

Abstract

The utility model discloses a concave cycloidal gear structure, which comprises a cycloidal wheel meshing with a group of ring-arranged pin teeth on the pin wheel, the outer peripheral tooth surface of the cycloidal wheel forms a lower concave surface, and the pin teeth form a central convex The drum-shaped, the convex drum-shaped side wall curved surface in the middle of the pin teeth is matched with the lower concave surface of the cycloid wheel for meshing transmission. The cycloid gear in the utility model has a large contact area with the pin teeth, and the force is uniform, and the cycloid gear has high transmission efficiency and long service life.

Description

A concave cycloidal gear structure

technical field

The utility model relates to the technology of a reducer, in particular to a concave cycloidal 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 concave 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 concave cycloidal gear structure, including a cycloid wheel meshing with a set of circularly arranged pin teeth on the pin wheel, the tooth surface on the outer periphery of the cycloid wheel forms a concave surface, and the pin teeth form a convex drum shape in the middle, and the pin teeth The convex drum-shaped side wall curved surface in the middle of the tooth is matched with the lower concave surface of the cycloid wheel for meshing transmission.

After adopting the above structure, the utility model is different from the tooth profile of the pin wheel on the cylindrical surface in the traditional cycloidal gear rotation mechanism. With such a matching structure, under the same thickness, the distance between the cycloidal gear and the pin teeth The contact area is larger than that of ordinary cycloid gears, so the force is uniform, the wear is small, the transmission efficiency of cycloid gears is high, and the service life is long. the

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 pin teeth in the cycloid gear structure, as shown in Fig. 3 to Fig. The pin teeth 3 are meshed. In the utility model, the tooth surface of the outer periphery of the cycloidal wheel 2 forms a lower concave surface 21, which forms a bonding surface for the transmission of the needle teeth 3. And the pin tooth 3 forms a drum shape with a convex middle part, and the convex drum-shaped side wall curved surface in the middle part of the pin tooth 3 can be fully contacted in the lower concave surface 21 for meshing transmission, so that when the cycloidal wheel 2 rotates, the outer surface of the pin tooth 3 The convex drum-shaped surface can drive in the lower concave surface 21 in the cycloidal wheel 2, forming a meshing fit.                 

The tooth surface of the cycloidal wheel that meshes with the pin teeth forms a lower concave surface 21, and the pin teeth 3 form a drum shape that is convex in the middle, and the area of the convex drum surface is larger than that of the cylindrical pin tooth side. And the lower concave surface 21 in the cycloidal wheel cooperates with the pin teeth 3, thereby increasing the contact surface between the cycloidal wheel and the pin teeth 3. It is different from the tooth profile of the cylindrical pin wheel in the traditional cycloidal gear rotation mechanism. With such a matching structure, under the same thickness, the contact area between the cycloidal gear and the pin teeth 3 is larger than that of the ordinary cycloidal gear. The contact area of the gear is large, so the force is uniform, the wear is small, the transmission efficiency of the cycloid gear is high, and the service life is long. Theoretically, it can realize meshing without backlash in the strict sense, so it has the characteristic of "zero" backlash. The 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 (1)

1. a spill cycloidal gear structure, comprise that cycloid wheel is meshed with the pin tooth of one group of annular array on pinwheel, it is characterized in that: the flank of tooth of cycloid wheel periphery forms concave surface, and pin tooth forms the cydariform of middle part evagination, the cydariform sidewall curved surface of pin tooth middle part evagination is engaged in engagement driving in the concave surface of cycloid wheel.