CN104143285B - Planet circular system simulation teaching aid - Google Patents

Abstract

A planetary gear system simulation teaching aid relates to a teaching tool for simulating the motion of a planetary gear system, which is provided with a planetary gear system simulation device, and the planetary gear system simulation device is provided with a central shaft rotatably arranged on a support and a rotating arm , sun gears with different numbers of teeth are fixed on the central shaft, and the central shaft passes through a fixed gear fixed on the support, and a plurality of planetary gear sets with different tooth ratios are arranged on the rotating arm. The transmission ratios of the planetary gear and the sun gear on the central shaft are different to demonstrate different motion effects. The rotation direction of the central shaft and the planetary gear carrier and the The motion information such as speed is processed and displayed on the multimedia display screen, and the simulation animation of the motion state of the wheel train is displayed at the same time. The invention can demonstrate the self-locking phenomenon of the 2K-H planetary gear train, the change of the rotational direction of the gear train, etc., and greatly improves the teaching effect.

Description

Planetary gear train simulation teaching aid

technical field

The invention relates to a teaching aid for simulating the motion of a planetary gear train, in particular to a planetary gear train simulation teaching aid.

Background technique

A planetary gear train is a typical epicyclic gear train, which is composed of a planetary gear, a planetary carrier and a sun gear. The motion form of the planetary gear system is the same as the motion of the solar system. The planets revolve around the sun while also rotating, while the sun only rotates. There are many types of planetary gear trains, among which the 2K-H type planetary gear train is a very typical and widely used planetary gear train. In the 2K-H planetary gear train, with the different number of gear teeth, sometimes "self-locking phenomenon" will occur, and sometimes the rotation direction of the gear train will change, just like some planets in the solar system have the same revolution direction and rotation direction And some are the opposite.

In the usual teaching, students have a lot of doubts and puzzles about the movement principle of this kind of planetary gear train and the actual rotation direction of the gears when the planetary gear train is driven. Therefore, the design and production of 2K-H planetary gear train teaching aids can be It is convenient for students to learn and understand the wheel train better in class.

Contents of the invention

The purpose of the present invention is to provide a teaching tool capable of simulating the movement of the 2K-H planetary gear train, so as to enrich the teaching content and improve the teaching effect.

In order to achieve the above object, the technical solution of the present invention is: a planetary gear train simulation teaching aid is provided with a planetary gear train simulation device, a left support and a right support are arranged in the planetary gear train simulation device, and the left support and the right support A central shaft is rotationally connected between the supports. Two sun gears with different numbers of teeth are fixed on the central shaft. A fixed gear is fixed on the left support. The central shaft passes through the center of the gear, and the right support is rotatably connected. A rotating arm driven by a handle. The rotating arm is connected to a support frame through a support shaft. A plurality of planetary gear frames are arranged around the support shaft on the support frame. Each planetary gear frame is equipped with a planetary shaft and two The planetary gears are respectively fixed at both ends of the planetary shaft. The planetary shaft is passed through the planetary gear frame and connected with the planetary gear frame in rotation. The gear meshes with a sun gear fixed on the central shaft. The two planetary gears on the same planetary gear carrier have different numbers of teeth, and the transmission ratios between the planetary gears on different planetary gear carriers and the sun gear on the central shaft are different. , a motion sensor for measuring the rotation direction and rotational speed of the central shaft and the support frame is respectively arranged on the left support and the right support, the signal output end of the motion sensor is connected to the information processor, and the data output of the information processor The terminal is connected with a multimedia display screen.

Beneficial effects: the present invention can demonstrate the self-locking phenomenon of the 2K-H planetary gear train and the change of the rotation direction of the gear train, etc., and at the same time visually display the motion parameters and simulation animation of the 2K-H planetary gear train, which covers The multi-faceted knowledge points in the teaching of planetary gear trains have greatly improved the teaching effect and improved the lack of practical teaching aids in the teaching of 2K-H planetary gear trains. The teaching aid of the invention is suitable for various teaching occasions such as multimedia, non-multimedia and laboratories, etc., occupies a small space, is convenient to carry, has simple design of each part, convenient processing, and easy-to-obtain materials.

Description of drawings

Fig. 1 is a schematic structural diagram of a planetary gear train simulation device of the present invention.

Fig. 2 is an assembly diagram of the planetary gear train simulation device of the present invention.

Marked in the figure: 1, left support, 2, right support, 3, central axis, 4, rotating arm, 5, supporting shaft, 6, planetary wheel frame, 7, handle, 8, right axle sleeve, 9, Left axle sleeve, 10, planet shaft.

detailed description

As shown in Figure 1 and Figure 2, the planetary gear train simulation teaching aid is provided with a planetary gear train simulation device, which is provided with a left support 1 and a right support 2, a left support 1 and a right support The seat 2 is fixed on the base, and a central shaft 3 is rotatably connected between the left support 1 and the right support 2, and a left sleeve 9 and a right sleeve 8 are respectively arranged in the left support 1 and the right support 2, One end of the central shaft 3 passes through the center of the left shaft sleeve 9, and the other end is arranged in the right shaft sleeve 8. The right shaft sleeve 8 is arranged in the right support 2 through a bearing, and the left shaft sleeve 9 is fixed on the left support 1. A 39-tooth gear is fixed on the left shaft sleeve 9, and the central shaft 3 passes through the center of the gear, and the central shaft 3 is connected with two sun gears with 37 and 41 teeth respectively by keys. One end of the right shaft sleeve 8 is connected with a rotating arm 4, and the other end is connected with a handle 7. The rotating arm 4 and the handle 7 are connected together through the right shaft sleeve 8. The rotating arm 4 is connected with a support frame through a support shaft 5. A plurality of planetary gear frames 6 are arranged around the support shaft 5 on the frame. One end of the support shaft 5 is connected to the rotating arm 4, and the other end is set in the bolt hole provided at the center of the support frame and fixed by a nut. The planetary gear carrier 6 can be set to three, which are different lengths of extension handles, and each extension handle is provided with a planetary shaft 10 and two planetary wheels respectively fixed on the two ends of the planetary shaft 10 to form a planetary wheel group, the planetary shaft 10 is passed through the planetary gear carrier 6 and is rotatably connected with the planetary gear carrier 6. The two planetary gears in each planetary gear set have different tooth ratios. Among them, the planetary gears of the three planetary gear sets The gear ratio is 18-16 teeth, 14-16 teeth, 41-39 teeth, and the three planetary gear sets are respectively connected with two gears of 39-41 teeth and two gears of 39-37 teeth on the central shaft 3. Gears, 39-tooth-41-tooth two gears mesh, three planetary gear sets with different tooth ratios mesh with the gears on the central shaft 3 to obtain three kinds of motion results respectively, and the 41-tooth-39-tooth planetary gear sets form the same direction transmission The mechanism, that is, the rotation direction of the planetary wheel carrier 6 is the same as the rotation direction of the central shaft 3, its transmission ratio is 12:1, and the efficiency calculation value of its reverse stroke is negative, which can demonstrate the "self-locking" phenomenon of the mechanism; The 18-tooth-16-tooth planetary gear set can also form a co-directional transmission mechanism, and its transmission ratio is 6:1; the 14-tooth-16-tooth planetary gear set can form a reverse transmission mechanism, that is, the rotation direction and center of the planetary gear carrier 6 The rotation direction of shaft 3 is opposite, and its transmission ratio is 5:1. The two planetary gears in each planetary gear set can respectively mesh with a 39-tooth gear fixed on the left support 1 and a sun gear fixed on the central shaft 3 . When a certain planetary gear set meshes with the gear on the central shaft 3, the other two planetary gear sets are idle. If necessary, loosen the nut at the end of the support shaft 5, and turn the support frame so that the other planetary gear sets are in contact with the central shaft. The gears on the 3 are meshed to realize the free replacement of the three planetary gear sets. A motion sensor for measuring the rotation direction and rotational speed of the central shaft 3 and the support frame is respectively arranged on the left support 1 and the right support 2, wherein the support frame and the planetary wheel frame 6 are integrally structured or fixedly connected, so the support frame The direction of rotation and the speed of rotation are the same as those of the planetary wheel carrier 6. The signal output end of the motion sensor is connected to the information processor, and the data output end of the information processor is connected to a multimedia display screen. The motion sensor transmits the measured motion information such as the rotation direction and speed of the central shaft 3 and the support frame to the information processor, and the information processor converts the received data into the transmission ratio, rotation direction, efficiency and speed of the gear train, etc. The most important data, and the processed data will be displayed on the multimedia display screen, and the simulation animation of the motion state of the wheel train will be displayed at the same time.

Claims (1)

1. A planetary gear train simulation teaching aid, characterized in that: a planetary gear train simulation device is provided, and a left support (1) and a right support (2) are arranged in the planetary gear train simulation device, and on the left support A central shaft (3) is rotationally connected between (1) and the right support (2). Two sun gears with different numbers of teeth are fixed on the central shaft (3), and a fixed shaft (3) is fixed on the left support (1). gear, the central shaft (3) passes through the center of the fixed gear, and a rotating arm (4) driven by the handle (7) is rotated on the right support (2), and the rotating arm (4) and the handle (7) connected by rotating the right shaft sleeve (8) set in the right support (2), one end of the central shaft (3) is rotated and set in the right shaft sleeve (8), and the rotating arm (4) passes through the support shaft (5 ) is connected to a support frame, one end of the support shaft (5) is connected to the rotating arm (4), the other end is passed through the bolt hole set in the center of the support frame, and fixed by a nut, and the support shaft (5) is wound on the support frame ) is provided with a plurality of planetary gear carriers (6), and each planetary gear carrier (6) is provided with a planetary shaft (10) and two planetary wheels respectively fixed on both ends of the planetary shaft (10), and the planetary shaft (10 ) is worn on the planetary gear frame (6) and connected with the planetary gear frame (6) in rotation, one of the planetary gears on each planetary gear frame (6) can be fixed on the left support (1) The other planetary gear can mesh with a sun gear fixed on the central shaft (3). The two planetary gears on the same planetary gear carrier (6) have different numbers of teeth, and different planetary gear carriers (6) The transmission ratio of the planetary gear on the center shaft (3) and the planetary gear on the center shaft (3) is different, and there are one on the left support (1) and the right support (2) for measuring the center shaft (3) and A motion sensor for the rotation direction and rotational speed of the support frame, the signal output end of the motion sensor is connected to the information processor, and the data output end of the information processor is connected with a multimedia display screen.