High-concentricity rotating output shaft transmission mechanism
By using the shaft coupling of the planetary wheel train in the grinder, the rotation unstable and twitching problems of the output shaft transmission mechanism are solved, and high concentric rotation is achieved, which improves the accuracy of the grinding particles and reduces costs.
Patent Information
- Application Number
- CN202422598346.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-25
AI Technical Summary
In existing bean grinders, the output shaft transmission mechanism is prone to unstable rotation and squirming, resulting in inaccurate control of coffee powder particle size and increasing product costs.
The shaft coupling device including the first and second layers of planetary wheel trains is adopted. The output shaft and the motor shaft are connected through the shaft coupling device. Using the concentric operation characteristics of the planetary wheel train, the output shaft is limited through the sun gear shaft hole, and at least one bearing is omitted.
Improves the rotational stability of the output shaft, avoids swaying and shaking, reduces product costs, and improves the accuracy control of grinding particles.
Smart Images
Figure CN223152674U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical transmission, in particular to an output shaft transmission mechanism with high concentricity rotation. Background Art
[0002] Output shaft transmission mechanisms are widely used in daily life, especially in the field of household appliances that require rotational work, such as bean grinders. The working principle of bean grinders is to grind coffee beans through the relative movement of the dynamic and static grinding discs, so as to obtain coffee powder of suitable particle size for making people's favorite coffee beverages. In existing bean grinders, the dynamic grinding disc is driven by a motor, and the motor shaft and the output shaft are usually connected through a coupling to achieve power transmission. The output shaft is usually supported by at least one bearing. Since one end of the output shaft needs to be equipped with a grinder, it is impossible to suppress the swing control at this end with a structure supported at both ends. In order to suppress the swing of the output shaft, the output shaft is usually supported by two or more bearings at the output shaft end, but the actual application effect is not ideal and the cost of the product has been increased. This structure in which the motor shaft transmits power through a coupling and the output shaft outputs power to the grinder under the support of the bearing is prone to the phenomenon of shaft end swinging and rotational movement, which is not conducive to accurately controlling the particle size of the coffee powder. Utility Model Content
[0003] The utility model aims to provide an output shaft transmission mechanism with high concentricity rotation, so as to solve the problems of unstable rotation and easy movement caused by coupling transmission, and overcome the shortcomings of the prior art.
[0004] The utility model provides a high-concentricity rotating output shaft transmission mechanism through the following technical scheme, including a motor, a motor shaft, a shaft coupler, an output shaft, and an output shaft bearing. The two ends of the shaft coupler are respectively connected to the motor shaft and the output shaft for transmission, so that the motor shaft drives the output shaft to rotate. It is characterized in that the shaft coupler includes a first-layer planetary gear train and a second-layer planetary gear train, and the two planetary gear trains are stacked and share a gear ring; the sun gear of the first-layer planetary gear train is connected to the motor shaft, and the output shaft includes an output shaft body and a first shaft end arranged at one end of the output shaft body, the output shaft body is fixedly connected to the planetary frame of the second-layer planetary gear train, and the first shaft end extends into the shaft cavity of the sun gear of the second-layer planetary gear train.
[0005] The output shaft extends into the cavity of the bean grinding assembly, and a moving knife and a stationary knife are arranged in the cavity of the bean grinding assembly. The output shaft is connected to the moving knife and drives the moving knife to rotate about the central axis of the output shaft. The moving knife and the stationary knife move relative to each other to grind the beans into powder.
[0006] The first-layer planetary gear train includes a first sun gear, a first-layer planet carrier, and a first-layer planetary gear. The second-layer planetary gear train includes a second sun gear, a second-layer planet carrier, and a second-layer planetary gear. The second sun gear includes a sun gear body and a wheel seat. The wheel seat is embedded in the center of the first-layer planet carrier.
[0007] The second-layer planet carrier is provided with a convex cylinder portion, and the first shaft end passes through the convex cylinder portion and is inserted into the shaft hole of the second sun gear.
[0008] The utility model has the following beneficial effects: the utility model ensures that the rotation of the motor shaft and the output shaft always revolves around the central axis of the motor shaft through the planetary gear train mechanism, and uses the characteristic that the planetary gears run concentrically around the sun gear to control and align the concentricity of the output shaft by utilizing the sun gear shaft hole, thereby improving the transmission stability and effectively ensuring that the output shaft rotates with high concentricity.
[0009] The utility model supports the output shaft through the planetary gear system, and at least one bearing can be omitted. The first shaft end of the output shaft extends into the sun gear shaft cavity to form a suppression point, and forms a double suppression point with the output shaft bearing to control the output shaft, which can basically avoid the phenomenon of the shaft end swinging and shaking when the output shaft rotates, and reduce product costs at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a cross-sectional view of the output shaft transmission mechanism with high concentricity rotation described in the utility model.
[0011] Figure 2 It is a three-dimensional diagram of the output shaft transmission mechanism with high concentricity rotation of the utility model (the gear ring is omitted).
[0012] Figure 3 This is a structural cross-section diagram of the first and second layer planetary gear trains.
[0013] Figure 4 This is a structural cross-sectional diagram of a shaft coupling with an output shaft.
[0014] Figure 5 This is a structural cross-sectional diagram of a shaft coupling without an output shaft. DETAILED DESCRIPTION
[0015] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.
[0016] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.
[0017] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.
[0018] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0019] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0020] Reference Figures 1-5 , an output shaft transmission mechanism with high concentricity rotation, including a motor 4, a motor shaft 5, a shaft coupler, an output shaft 1, and an output shaft bearing 11, the two ends of the shaft coupler are respectively connected to the motor shaft and the output shaft, so that the motor shaft drives the output shaft to rotate, the shaft coupler includes a first-layer planetary gear train 6 and a second-layer planetary gear train 7, the two planetary gear trains are stacked and share a gear ring 2; the sun gear of the first-layer planetary gear train is connected to the motor shaft, the output shaft includes an output shaft body, a first shaft end arranged at one end of the output shaft body, the output shaft body is fixedly connected to the planetary frame of the second-layer planetary gear train, and the first shaft end extends into the shaft cavity of the sun gear of the second-layer planetary gear train. The invention utilizes the characteristics of the planetary gear system, in which the meshing connection between the planetary gear and the sun gear and the ring gear keeps the sun gear at the center position at all times. By supporting the output shaft with the planetary gear system, at least one bearing can be omitted. Moreover, by extending the output shaft 1 into the shaft cavity of the sun gear, a limit point is formed, and the output shaft bearing 11 forms a second limit point. The constraints of the two limit points greatly reduce the swing and shaking of the shaft end of the output shaft, thus overcoming the shortcomings of the prior art. The drawings of this embodiment only show the situation of two sets of planetary gear systems stacked for transmission. When a wider transmission ratio is required, multiple layers of planetary gear systems can be added between the first layer of planetary gear systems and the second layer of planetary gear systems to adjust the transmission ratio.
[0021] The output shaft extends into the cavity of the bean grinding assembly. A moving knife and a stationary knife are arranged in the cavity of the bean grinding assembly. The output shaft is connected to the moving knife and drives the moving knife to rotate around the central axis of the output shaft. The relative movement between the moving knife and the stationary knife grinds the beans into powder. As Figures 1-3 shown, the gear ring 2 is installed on the chassis 3. Inside the gear ring 2 are two planetary gear trains stacked up and down, namely the first-layer planetary gear train and the second-layer planetary gear train.
[0022] The first-layer planetary gear train 6 includes a first sun gear 61, a first-layer planetary carrier 63, and first-layer planetary gears 62. The second-layer planetary gear train includes a second sun gear 71, a second-layer planetary carrier 73, and second-layer planetary gears 72. The second sun gear 71 includes a sun gear body and a wheel seat, and the wheel seat is embedded in the center of the first-layer planetary carrier 63. As Figure 4 shown, the three first-layer planetary gears 62 are clamped by the first-layer planetary carrier 63 and the gear train chassis 60. The planetary gear shaft 74 is installed between the first-layer planetary carrier 63 and the gear train chassis 60, and between the second-layer planetary carrier 73 and the first-layer planetary carrier 63. Both gear trains have three planetary gears, which are evenly distributed at 120 degrees and the first-layer planetary carrier and the second-layer planetary carrier are staggered by 180 degrees. Therefore, when the motor shaft rotates, the instantaneous operating positions of the first-layer planetary gears and the second-layer planetary gears are also staggered by 180 degrees.
[0023] The second-layer planetary carrier is provided with a convex cylinder part, and the first shaft end passes through the convex cylinder part and is inserted into the shaft hole of the second sun gear.
[0024] When the motor shaft rotates, it drives the first sun gear to rotate. Since the gear ring is fixed, the first-layer planetary gears move along the gear ring in mesh and drive the first-layer planetary carrier to rotate. The rotation of the first-layer planetary carrier causes the second sun gear and the second-layer planetary carrier to rotate, driving the output shaft to rotate. The two-layer planetary gear train ensures a high level of concentricity between the output shaft and the motor shaft during rotation, overcomes the phenomenon of rotation shaft end play, is beneficial to the precision control of the grinding powder particles, does not damage the blades, and is beneficial to improving the reliable working time of the knife grinding assembly.
[0025] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A transmission mechanism for an output shaft with high concentricity rotation, comprising a motor, a motor shaft, a shaft coupling, an output shaft, and an output shaft bearing. The two ends of the shaft coupling are respectively in transmission connection with the motor shaft and the output shaft. It is characterized in that, The shaft coupler includes a first planetary gear train and a second planetary gear train. The two planetary gear trains are stacked and share a ring gear. The sun gear of the first planetary gear train is connected to the motor shaft. The output shaft includes an output shaft body and a first shaft end provided at one end of the output shaft body. The output shaft body is fixedly connected to the planet carrier of the second planetary gear train, and the first shaft end extends into the shaft cavity of the sun gear of the second planetary gear train.
2. The output shaft drive mechanism with high concentricity rotation according to claim 1, characterized in that, The output shaft extends into the grinding bean assembly cavity, and a moving knife and a stationary knife are arranged in the grinding bean assembly cavity. The output shaft is connected to the moving knife and drives the moving knife to rotate around the central axis of the output shaft, and the moving knife and the stationary knife move relative to each other to grind the beans into powder.
3. A transmission mechanism for an output shaft with high concentricity rotation according to claim 1 or 2, characterized in that, The first planetary gear train includes a first sun gear, a first planet carrier, and first planetary gears. The second planetary gear train includes a second sun gear, a second planet carrier, and second planetary gears. The second sun gear includes a sun gear body and a wheel seat, and the wheel seat is embedded in the center of the first planet carrier.
4. A transmission mechanism for an output shaft with high concentricity rotation according to claim 3, characterized in that, The second planet carrier is provided with a convex cylinder portion, and the first shaft end passes through the convex cylinder portion and is inserted into the shaft cavity of the second sun gear.