CN112145630A - Planetary gear reducer with planet carrier positioning mechanism - Google Patents

Abstract

This patent provides a planetary gear reducer with a planetary carrier positioning mechanism. It radially positions the planetary carrier by using a tangential structure between a support wheel and a support seat mounted on the planetary carrier, preventing radial movement of the planetary carrier and planetary gears and improving the performance of the planetary gear reducer. It includes a housing, a sun gear, planetary gears, and a planetary carrier. It has two sun gears with coincident axes: a first sun gear fixed to the housing and a second sun gear rotating relative to the housing. There are at least three sets of planetary gears. Each set includes a first planetary gear and a second planetary gear meshing with the first and second sun gears, respectively. The first and second planetary gears are coaxially fixed and rotatably mounted on the planetary carrier. A support wheel is rotatably mounted on the planetary carrier. A cylindrical support seat coaxial with the sun gear is located on the housing, the first sun gear, or the second sun gear. The outer circle of the support wheel is tangent to the support seat.

Description

Planetary gear reducer with planet carrier positioning mechanism

technical field

This patent relates to a planetary gear reducer, specifically, a planetary gear reducer capable of radially positioning the planetary gear and the planet carrier.

Background technique

Planetary gear reducer has the characteristics of small size and large bearing capacity, and is widely used, especially the planetary gear reducer with double sun gear and double planetary gear structure, because it does not use internal gears, it has lower cost and higher cost. precision. Since the gear transmission needs to design the backlash to ensure high transmission efficiency, this requires that the planetary carrier must be positioned radially to avoid vibration and abnormal wear caused by the radial offset of the planetary gear and the planetary carrier. In a general planetary gear reducer with double sun gears and double planetary gears, as shown in FIG. 1 , the first sun gear 21 is a fixed gear, the second sun gear 22 is an output gear, and at one end of the output gear, the planet carrier 25 adopts the first The second bearing 42 is supported on the casing 100, and one end of the fixed gear is fixed. Due to the influence of the fixed gear, the planet carrier 25 needs to use the first bearing 41 with a larger size to be supported on the casing 100. This is used in high-speed transmission applications. The application of this type of reducer in high-speed transmission is limited because the speed of the large bearing is difficult to meet the requirements.

SUMMARY OF THE INVENTION

The purpose of this patent is to provide a planetary gear reducer with a planetary carrier positioning mechanism, which radially positions the planetary carrier by rotating the supporting wheel and the tangent structure of the supporting seat arranged on the planetary carrier, preventing the planetary carrier and the planetary The radial movement of the wheel improves the performance of the planetary gear reducer.

In order to achieve the above purpose, the planetary gear reducer with a planet carrier positioning mechanism of the present patent includes a housing, a sun gear, a planetary gear, and a planetary carrier, and has two sun gears whose axes coincide, that is, a No. 1 fixed on the housing. a sun gear and a second sun gear that rotates relative to the housing, there are at least three sets of planetary gears, each set of planetary gears includes a first planetary gear and a second planetary gear meshing with the first sun gear and the second sun gear respectively, The first planetary gear and the second planetary gear are coaxially and fixedly connected and are rotatably arranged on the planetary carrier, the supporting wheel is rotatably arranged on the planetary carrier, and the casing, the first sun gear or the second sun gear have the same as the sun gear. The cylindrical support seat is coaxial with the wheel, and the support wheel is tangent to the outer circle of the support seat.

In the above-mentioned planetary gear reducer, the first planetary gear and the second planetary gear are combined into one, which is an integral gear.

In the above-mentioned planetary gear reducer, the first planetary gear and the second planetary gear are two gears with different gear parameters.

In the above-mentioned planetary gear reducer, the support wheel is coaxially and fixedly connected to the first planetary gear or the second planetary gear.

In the above-mentioned planetary gear reducer, the outer diameter of the support wheel is equal to the pitch circle diameter of the first planetary gear, and the outer diameter of the support seat is equal to the pitch circle diameter of the first sun gear. In this way, the relative sliding between the support wheel and the tangential outer cylindrical surface of the support seat can be avoided to cause wear.

In the above-mentioned planetary gear reducer, each planetary gear set is evenly distributed on the same circumference.

Beneficial effects of this patent: During operation, the support wheel revolves under the drive of the planet carrier and rotates relative to the planet carrier. The planetary carrier and the planetary gear move radially to improve the performance of the planetary gear reducer. At the same time, since the supporting wheel is coaxial with the planetary gear and is located in the circumferential direction of the sun gear, the outer diameter of the supporting wheel is small, so the supporting wheel can be rotated and arranged on the planet carrier through a small bearing with a smaller outer diameter. The planetary gear reducer It can be used in high-speed transmission occasions.

Description of drawings

Figure 1 is a schematic diagram of a conventional planetary gear reducer.

Figure 2 is a schematic diagram of a planetary gear reducer with a positioning mechanism.

Figure 3 is a schematic diagram of the relative positions of the support wheel and the support base.

FIG. 4 is a schematic diagram of the relative positions of another support wheel and the first planetary wheel.

FIG. 5 is a schematic diagram of the tangent to the outer periphery of the support wheel and the support seat.

FIG. 6 is a schematic diagram of a tangent to the outer circumference of another support wheel and the support base.

Fig. 7 is another schematic diagram of the tangent between the outer periphery of the support wheel and the support seat.

In the figure, the housing 100, the first sun gear 21, the second sun gear 22, the first planetary gear 23, the second planetary gear 24, the planet carrier 25, and the planetary gear shaft 26;

The first bearing 41 , the second bearing 42 , the third bearing 43 , the fourth bearing 44 ; the supporting wheel 5 , the supporting seat 6 .

Detailed ways

Example 1:

Referring to the planetary gear reducer with planet carrier positioning mechanism shown in FIG. 2 , it mainly includes a first sun gear 21 , a second sun gear 22 , a first planetary gear 23 , a second planetary gear 24 , a planetary carrier 25 , and a planetary gear shaft 26 , Support wheel 5 , support seat 6 , second bearing 42 , third bearing 43 , fourth bearing 44 .

The first planetary gear 23 and the second planetary gear 24 mesh with the first sun gear 21 and the second sun gear 22 respectively. The first planetary gear and the second planetary gear are coaxially and fixedly connected and are rotatably arranged on the planetary gear shaft through the third bearing 43 . 26 constitutes a planetary gear set. There are at least three sets of planetary gears evenly distributed on the same circumference (see Figure 3). The planetary axle 26 is fixed on the planet carrier 25 . The axes of the first sun gear 21 fixed on the casing 100 and the second sun gear 22 rotating relative to the casing through the bearing are coincident.

The support wheel 5 that is coaxial with the first planetary gear is rotatably arranged on the planetary wheel shaft 26 through the fourth bearing 44, and has a cylindrical support seat 6 that is coaxial with the first sun gear on the housing or/and the first sun gear, The support wheel is tangent to the outer circle of the support seat. The outer diameter of the support wheel 5 is equal to the pitch circle diameter of the first planetary gear 23 , and the outer diameter of the support seat 6 is equal to the pitch circle diameter of the first sun gear 21 .

The first planetary gear 23 and the second planetary gear 24 may be an integral gear that is combined into one, or may be two gears with different gear parameters.

Embodiment 2: The main difference between Embodiment 2 and Embodiment 1 is that the support wheel 5 and the first planetary wheel 23 are coaxially and fixedly connected. At this time, since the support wheel 5 is fixedly connected with the first planetary wheel 23 and there is a third bearing between the first planetary wheel and the planetary wheel shaft, the fourth bearing may not be provided between the support wheel 5 and the planetary wheel shaft 26 .

Example 3: The difference between Example 3 and Example 1 is that the support wheel 5 tangent to the outer circle of the support seat 6 is rotated and arranged on the planet carrier through the fourth bearing 44 , and is different from the first planet wheel 23 axis.

The planetary gear reducer of this patent is a planetary gear reducer with a double sun gear and a double planetary gear structure without an internal gear. The cylindrical support seat is coaxial with the wheel, and the outer circles of the two cylindrical structures are tangent and are opposite rolling surfaces.

The cylindrical support wheel that is coaxial with the planetary wheel can be fixedly connected with the planetary wheel. In order to avoid the relative sliding between the two cylindrical surfaces, the preferred design scheme is: The outer diameter of the support wheel is equal to the pitch circle diameter of the first planetary gear meshing with the fixed first sun gear, and the outer diameter of the support seat coaxial with the fixed first sun gear is equal to the pitch circle diameter of the first sun gear.

The said support seat coaxial with the sun gear can be an independent part, can also be integrated with the first sun gear, and can also be integrated with the casing.

The support wheel coaxial with the planetary wheel can also be independently (not fixed to the planetary wheel) rotatably arranged on the planetary wheel shaft, and supported on the planetary wheel shaft by a bearing.

At least three support wheels coaxial with the planetary gear and a support seat coaxial with the sun gear constitute a positioning mechanism for positioning the planetary wheel, so that the orbit of the center of the planetary wheel is relatively fixed, avoiding the radial channeling of the planetary wheel and the planet carrier. to improve the performance of the reducer.

The specific structure of the planet carrier does not affect the protection scope of the claims of this patent.

In the planetary gear reducer, the planet carrier can be the input element, the rotating second sun gear can be the output element, or the opposite, which does not affect the protection scope of the claims of this patent;

The support wheel can be coaxial with the planetary wheel or not. The joint surface (tangent surface) of the support wheel and the support seat can be a cylindrical surface, a shaped surface, a circular arc surface, a conical surface, etc., or a combination of them. The shape of the joint surface of the two It does not affect the scope of protection of the claims of this patent; for example, the support wheel 5 is directly tangent to the outer circumference of the support seat 6, and the tangent surface is a V-shaped surface (see Figure 5), or the tangent surface is a cone-shaped surface (see Figure 6), Or the tangent plane is a curved plane (see Figure 7).

The supporting method of the planetary gear, the first sun gear, the planetary gear carrier, etc., such as whether or not a bearing is used and what kind of bearing is used, does not affect the protection scope of the claims of this patent.

Claims (6)

1. Planetary gear reducer with planet carrier positioning mechanism, including casing, sun gear, planet wheel, planet carrier, characterized by: the planetary gear set comprises at least three groups of planetary gears, each group of planetary gears comprises a first planetary gear and a second planetary gear which are respectively meshed with the first sun gear and the second sun gear, the first planetary gear and the second planetary gear are coaxially fixed and rotatably arranged on a planetary frame, a supporting wheel is rotatably arranged on the planetary frame, a cylindrical supporting seat coaxial with the sun gear is arranged on the shell, the first sun gear or the second sun gear, and the supporting wheel is tangent to the excircle of the supporting seat.

2. The planetary gear reducer according to claim 1, wherein: the first planet wheel and the second planet wheel are combined into a whole, and the whole gear is formed.

3. The planetary gear reducer according to claim 1, wherein: the first planet gear and the second planet gear are two gears having different gear parameters.

4. The planetary gear reducer according to claim 1, wherein: the supporting wheel is coaxially and fixedly connected with the first planet wheel or the second planet wheel.

5. The planetary gear reducer according to claim 1, wherein: the supporting wheel external diameter equals the pitch circle diameter of first planet wheel, and the external diameter of supporting seat equals the pitch circle diameter of first sun gear.

6. The planetary gear reducer according to claim 1, wherein: all the planetary wheel sets are uniformly distributed on the same circumference.

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