Training device for demonstrating gearing by means of overhead projector

FIELD: engineering of training appliances utilized in training process during studies of mechanics, physics, theory of mechanisms.

SUBSTANCE: training device for demonstration of gearing by means of overhead projector contains body of transparent material in form of plates 1,2, driving disk 5, leading cog 7c with external teeth and following cog 8 with internal teeth, held on axis, and gear couple with external connection. Gear couple is mounted on lower plate 1 of body, one gear 14 of which is connected to following cog 8. leading cog 7 is mounted on driving disk 5, and following cog 8 - with possible free rotation on upper plate of body by means of additional disk 9 and axis 11.

EFFECT: expanded demonstrational capabilities of device, unification of devices, demonstrating types of gearings, decreased device dimensions, increased legibility of image on screen and improved efficiency of device utilization during training process.

1 dwg

 

The invention relates to the field of educational visual AIDS used in the teaching process in the study of mechanics, physics, theory of mechanisms and machines and other disciplines.

Known training devices for the study of the teeth included in the list of technical training and standard training-laboratory equipment /1/. Among educational devices known model "a Pair of spur wheel with external toothing and a Pair of spur wheel with internal toothing". Model gear installed on the unified solid metal stand and consist of master and slave wheel. In the first model, both wheels have an outer cutting teeth, the second model - one wheel has an external cutting teeth, and the other internal. Demonstration of the types of gears by rotating the drive wheel by means of a handle.

A disadvantage of the known devices is their robustness and large metal consumption, design complexity, the greater complexity of manufacturing and the impossibility of their use when lecturing in front of a large audience as well as for individual student learning.

The closest to the technical nature of the claimed invention is a device for displaying the work of planar mechanisms with OSU of overhead projector (kodascope) /2/.

The device has a housing in the form of three or more plates of transparent organic glass, and in the space between the middle and bottom plates is the drive disk, a segment of which is beyond them to provide a drive mechanism, and between the middle and top plates are links model flat mechanism including the gear mechanism. The transmission of rotational torque from the drive disk to the toothed wheel by using a multi-stage square-cylindrical axis.

The known device can be used to demonstrate gear external gear and internal gear meshing individually, which requires you to have two devices. This circumstance leads to the expansion of the Park models and wasteful consumption of materials in their manufacture. Additionally, a disadvantage of the known models is mnogoetazhnost design and considerable height, which in some cases leads to an unclear picture of the mechanisms on the screen due to poor focusing of the light flux.

The present invention is aimed at the unification of the educational device for demonstrating gear, the expansion of its demonstration of capabilities, simplifying its design and efficiency in the educational process.

The problem is solved by the fact that the educational device for demonstrating gears, comprising a housing of transparent material in the form of plates, drive disk, a segment of which is beyond them to provide a drive mechanism, the drive sprocket with the external cutting teeth and a follower gear wheel with internal cutting teeth mounted on the axes, is further provided with teeth, a pair of external gears, one gear wheel which engages with a driven gear wheel, with the aforementioned gear pair mounted on a bottom plate of the enclosure, the drive sprocket on the drive disk and the follower gear wheel on the top plate of the enclosure by means of additional disk rigidly mounted on the upper surface of the driven wheel, and the axis connecting the secondary drive and the top plate with the possibility of free rotation of the driven gear relative to the upper plate.

The training device of the device illustrated in the drawing,which shows a training device in two projections - front view and top view.

A training device is made entirely of transparent colored plexiglass. The links of the mechanism are different colors. The body is made of flint glass. The entire device is placed in the frame, consisting of the bottom 1 and top 2 plates, skreplennyi the screws 3. Between the plates 1 and 2 are strip 4, which regulates the height of the plates and providing the necessary clearance between the links for free rotation.

On the bottom plate 1 is mounted disk drive 5, a segment of which is beyond the plates to ensure manual or electric drive mechanism. The drive disc fixed on the axis 6, which has a square cylindrical shape. On the drive disk 5 mounted drive sprocket 7 with an external cutting teeth. They both are "planted" on the axis of the interference fit to secure the transfer of torque and avoid falling to the axis of the housing.

Slave gear wheel 8 is provided with an additional disk 9, rigidly secured to its upper surface by means of probes 10, soldered in both parts. Slave gear wheel 8 with additional disk 9 with the axis 11 is bonded with the upper plate 2 of the casing with a clearance so as to ensure free rotation of the driven gear 8 relative to the upper plate. The drive sprocket 7 is engaged with driven gear wheel 8. This pair shows a gear internal gear.

On the bottom plate 1 of the casing on the axes 12 and 13 are soldered to the plate, is mounted a gear pair of external gears, one gear wheel 14 which is in C is Ceplene with the slave gear wheel 8, and the other gear wheel 15 is engaged with the toothed wheel 14. This pair shows a gear external gear.

A training device operates as follows. During the rotation of the disk drive 5 drive sprocket 7 transmits the rotational torque to the slave gear wheel 8 and it starts to rotate on the axis 11, showing the work gears internal gears.

Slave gear wheel 8 simultaneously connected with the toothed wheel 14 and rotates it. Gear wheel 14 transmits the rotary motion of the toothed wheel 15, thus demonstrating the gear external gear.

Thus, the design of the device enables the simultaneous display of two basic types of gears - transmission of external and internal gears.

The use of the instrument in the educational process is the following. First, students are shown the device, its structure and operation. Further, the device is placed on the table of kodascope and the screen shows colored, vivid and eye-catching static "picture" of the device, which studied the device gears. Further, the mechanism is in motion (manual or electric) and dynamic "picture" study of the mechanism and interaction links with each other.

We offer a training device compared to what rotation and analogues has the following advantages:

1). Introduction to design additional gear external gear can unify two separate and different device to demonstrate external and internal engagement and to expand their demonstration opportunities.

2). Securing a leading gear wheel 7 directly on the drive disk 5 and securing the driven gear wheel 8 on the top plate of the enclosure enables the elimination of the construction of the intermediate plate separating the drive disk and the links of the mechanism, which can significantly reduce the height of the apparatus and material consumption.

3). Reducing the height of the device can improve the clarity of the image on the screen due to better focusing the light flux.

4). More efficient use of the instrument in the educational process by expanding its demonstration of capabilities, simultaneous display of two types of gear and a clearer image on the screen.

5). The device is simpler in construction, contains fewer parts than the two instruments separately), easy to manufacture and maintain.

According to the invention, carrying out the design work and preliminary tests, which yielded positive results. Planned to produce a training device in the framework of "Educational technology" for als is injured in educational institutions.

Sources of information

1). Yudenich CENTURIES of Technical training and standard training-laboratory equipment. M.: Higher school, 1974.

2). Speaker of the USSR № 341071. Device to demonstrate the work of planar mechanisms using the overhead projector. M CL G 09 B 1/22, 1972.

Educational device for demonstrating gears using kodascope, comprising a housing of transparent material in the form of plates, drive disk, a segment of which is beyond them to provide a drive mechanism, the drive sprocket with the external cutting teeth and a follower gear wheel with internal cutting teeth mounted on the axes, characterized in that it further provided with a notched a pair of external gears, one gear wheel which engages with a driven gear wheel, with the aforementioned gear pair mounted on a bottom plate of the enclosure, the drive sprocket on the drive disk and the follower gear on the top plate of the enclosure by means of additional disk rigidly mounted on the upper surface of the driven gears and the axis connecting the secondary drive and the top plate with the possibility of free rotation of the driven gear relative to the upper plate.



 

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