JP2007322129A - Impact testing machine for gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impact testing machine for a gear, capable of testing a meshing part of a gear by applying such a tangential shearing load as that in a rotation time. <P>SOLUTION: This impact testing machine includes, in a testing machine main body 1, a testing body T constituted of a moving plate 9 attached to allow dropping-directional moving of a steel ball B, a fixed plate 3 attached to prohibit moving, racks 5, 6 attached to the moving plate 9 and a moving plate 10 and moved integrally therewith, and a pinion gear 4 meshed with the racks 5, 6 and attached rotatably to the fixed plate 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gear impact tester, and more particularly to a gear impact tester suitable for performing a load resistance test in a shearing direction applied to a meshing portion when a gear rotates.

  As a conventional impact tester, a technique described in Patent Document 1 is known. That is, a steel ball (weight) is dropped and made to collide with a specimen, and the impact resistance of the specimen is measured from the deformation state of the specimen.

However, the conventional impact testing machine is suitable for performing load resistance tests and impact resistance tests in the rotational direction (tangential direction) of the gear (gear) because the steel ball simply collides with the specimen in the drop direction. It was not.
JP 2005-233910 A

  As described above, when a gear is actually used, there is almost no problem of destruction or deformation that causes the gear to be crushed by a vertical pressure.

  However, when the paper cutter of the printer is bitten and an impact load is applied to the gear of the drive mechanism, or when the paper feed and back feed are repeated with the platen roller, an impact load is applied to the gear of the drive unit. It is conceivable that damage occurs at the meshing portion.

In order to reproduce such a state, conventionally, the durability of the entire apparatus was tested by actually operating the printer and repeatedly performing printing.
This required a long time, power, consumables and labor for the test.

  The present invention has been made in order to solve the above-described problems of the prior art, and the present invention is based on conditions close to the actual use state of the gear, i.e., in the tangential direction applied to the teeth when rotating and meshing with another gear. An object of the present invention is to provide a gear impact tester that can be tested by applying a shear load.

  In order to solve the above-mentioned problem, the configuration employed by the present invention is a gear impact tester that measures the impact resistance characteristics of a test specimen by colliding a dropped steel ball with the test specimen, and the test specimen comprises: A fixed portion and a support shaft that are prohibited from moving in the test machine body, a pinion gear that is rotatably supported by the support shaft, first and second racks that mesh with the pinion gear, the test machine body, and A first moving part attached to the first rack and allowed to move in the dropping direction of the steel ball, attached to the tester main body and the second rack, the rotation of the pinion gear and the second rack And a pressure sensor provided between the fixed part and the second moving part.

  In this case, it is preferable to record the pressure fluctuation urged by the second moving unit with the lapse of time using the pressure sensor.

  The rack is preferably made of a material stronger than the pinion gear.

  According to the above configuration, by adjusting the height and the number of times the steel balls are dropped, the shearing load in the tangential direction can be repeatedly applied to the meshing portion of the rack and the pinion gear in a stepwise manner, and the condition under which the gear breaks is satisfied. It can be measured quantitatively.

  In particular, if pressure fluctuations urged by the second moving part are recorded with the passage of time using a pressure sensor, the energy used for the deformation of the gear can also be measured.

For example, the rack is made of a material that is stronger than the pinion gear, such as a metal material for the rack and a plastic material for the pinion gear.
In this way, plastic injection molding conditions can be formulated and used for strength design.

  According to the impact testing machine of the present invention, by dropping a steel ball from a predetermined height onto a test body, a quantitative impact is applied in a tangential direction to a predetermined portion (meshing portion) of a gear and in a shearing direction. Can be given repeatedly.

  In addition, power and consumables can be saved and the test time can be shortened without operating a machine incorporating a gear as in the conventional durability test.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited by this embodiment, and constituent elements in the embodiments shown below include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a side sectional view showing a gear impact tester according to an embodiment of the present invention, FIG. 2 is a sectional view in the direction of arrows II-II in FIG. 1, and FIG. It is.

The impact testing machine 1 is a testing machine that measures impact resistance characteristics of a specimen T by causing a steel ball (weight) B to collide with the specimen T.
The impact tester 1 is composed of a tester main body 2 and a test body T provided on one end side of the tester main body 2, and the tester main body 2 has a length extending in one width direction as shown in the figure. It is made of a plate-like member and is made of a material such as stainless steel so as not to be bent or deformed against the impact of the drop of the steel ball B or the like.

  The test body T is generally composed of a fixed plate 3, moving plates 9 and 10, racks 5 and 6, a pinion gear 4, and guide members 7 and 8 described below.

Reference numeral 3 denotes a fixing plate as a fixing portion. The fixing plate 3 has an L-shaped cross section, and is provided on one end side of the tester body 2 and protrudes vertically, and extends in parallel to the tester body 2 from the tip of the protrusion 3A. It consists of the opposing part 3B.
The projecting portion 3A is provided with a support shaft 11 projecting parallel to the tester main body, and the pinion gear 4 is rotatably supported.
The fixing plate 3 is provided in the testing machine main body 2 so as not to move, and is firmly integrated with the testing machine main body 2.
The pinion gear 4 is made of an engineering plastic that can be manufactured at a low cost in large quantities by injection molding or the like.

  Reference numerals 5 and 6 denote first and second racks that mesh with the pinion gear 4, and each rack 5 and 6 is made of a metal material that is stronger than the pinion gear 4, such as stainless steel, and is one end side of the testing machine main body 2. And a guide member 7 and 8 fixed to the protrusion 3A of the fixed plate 3, respectively, are provided so as to be horizontally movable.

Reference numerals 9 and 10 denote moving plates as moving parts attached to the first and second racks, respectively. Of these, the first moving plate 9 is supported by the guide member 7 in the dropping direction of the steel ball B. The second movable plate 10 is attached to the second rack and supported by the guide member 8 to allow the fixed plate 3 to move to the facing portion 3A side through the rotation of the pinion gear 4. Has been.
Reference numeral 11 denotes a pressure sensor provided between the facing portion 3 </ b> A and the second moving plate 10. The pressure sensor 11 converts a change in pressure into an electrical signal and outputs it to a measuring device (not shown). The measuring device records a pressure value as time passes.
Then, the energy received until the gear 4 breaks is obtained from the area on the graph obtained from the equation of (received pressure × time).

  The pinion gear 4 is a material to be tested in the present embodiment, and has a meshing portion 4A that meshes with the racks 5 and 6 on the outer peripheral surface thereof. Such a pinion gear 4 is used as an object for research and investigation of the influence of its material, manufacturing method, structure, etc. on durability.

  Reference numerals 12 and 13 denote cover plates provided so as to cover both side surfaces of the testing machine main body 2, and the scale 12A for measuring the height at which the steel ball B is dropped is provided on the cover plate 12. It is.

  The gear impact testing machine 1 according to the present embodiment has the above-described configuration. When used, the gear impact testing machine 1 is set up vertically, or as shown in FIG. Fix as tilted.

  And in the basic composition of allowing the steel ball B to drop naturally from the predetermined height toward the specimen T, there is no particular difference from that of the prior art.

However, according to the gear impact tester 1, by dropping the steel ball B onto the test body T from a predetermined height, a quantitative impact is applied to the meshing portion of the pinion gear 4 and the racks 5 and 6 in the shear direction. Can be given repeatedly.
As a result, there is no need to operate a machine incorporating a pinion gear as in the conventional durability test, power and consumables can be saved, and the test time and labor can be greatly reduced.

  Furthermore, by recording the output of the pressure sensor 6, it is possible to acquire quantitative data of energy received until the breakage from the expression (received pressure × time).

The gear impact testing machine of the present invention can be used for the material, processing, structural design, product evaluation, guarantee, etc. of plastic gears.
Moreover, it can utilize for the intensity | strength test of the member which meshes and rotates.

It is a cross-sectional view showing a gear impact tester according to an embodiment of the present invention. It is arrow II-II direction sectional drawing in FIG. It is explanatory drawing which shows an example of the usage method of the impact tester of a gear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Impact tester, 2 ... Test machine main body, 3 ... Fixed plate (fixed part), 4 ... Pinion, 5 ... First rack, 6 ... Second rack, 7, 8 ... Guide member, 9 ... First Moving plate, 10 ... second moving plate, 11 ... pressure sensor

Claims (3)

An impact tester for a gear that measures the impact resistance characteristics of a test specimen by colliding a dropped steel ball with the test specimen, and the test specimen is provided with a fixed portion and a support provided for prohibiting movement on the test machine main body. The axis,
A pinion gear rotatably supported by the support shaft;
First and second racks meshing with the pinion gear;
A first moving part attached to the tester main body and the first rack and allowed to move in the falling direction of the steel ball;
A second moving part attached to the tester main body and the second rack and allowed to move in a direction driven by rotation of the pinion gear and the second rack;
A gear impact tester comprising a pressure sensor provided between the fixed portion and the second moving portion.   The gear impact test machine according to claim 1, wherein the pressure fluctuation recorded by the second moving unit is recorded with the lapse of time by using the pressure sensor. 3. The gear impact tester according to claim 1, wherein the rack is made of a material stronger than the pinion gear.

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