JP2016114477A - Bad road durability test equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide bad road durability test equipment, capable of performing durability test in which a bad road is simulated, without contaminating an external environment, with a simple structure.SOLUTION: Bad road durability test equipment 1 comprises: an air permeable bag part 10 attached to cover surrounding of slide parts on plural slide members (cylinder Sand piston rod S) for repeating relative displacement, and tracking to repetitive motion of the slide members for deforming; powder 20 included in the bag part 10; and a blow part 30 for blowing air into the bag part 10. The air is blown into the bag part 10, thereby the powder 20 can be preferably dispersed in the bag part 10. Because the bag part 10 can deform by the slide members, adhesion of the powder 20 to an inner wall of the bag part 10 can be prevented, and the powder can be preferably dispersed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rough road durability test apparatus used for a durability test of automobile components.

  Various endurance tests have been proposed in order to examine whether or not a component having two sliding members that move relatively as a component of an automobile satisfies a desired characteristic. For example, when investigating the effects of driving on rough roads containing sand or mud, it is necessary to simulate the condition where parts that are easily affected by sand or mud, such as shock absorbers and sand, are in contact . As this simulation method, for example, sand or the like may be applied to the component or dropped.

  In Patent Document 1, as a test method using sand, sand is dropped between two rotating bodies (a disk-shaped rubber test piece and a polishing grindstone) which are in sliding contact with each other, and the adhesion of both is avoided by this sand. It is disclosed.

Japanese Patent Application Laid-Open No. 08-233716

  It is desired to develop a test apparatus that can easily perform an endurance test simulating a rough road including sand as described above without contaminating the external environment with respect to a component including the sliding member.

  For example, when sand or the like is applied to two sliding members that move relatively or is dropped as described above, the actual environment can be easily simulated. However, in this case, the sliding member moves during the test, so that sand or the like scatters around and contaminates the external environment. Moreover, it takes a lot of time to collect the powder, and it is inferior in the reusability of the powder. In addition, it is necessary to prepare a large amount of powder in consideration of the scattering amount.

  Therefore, one of the objects of the present invention is to provide a rough road durability test apparatus that can perform a durability test that simulates a rough road without polluting the external environment with a simple configuration.

  A rough road durability test apparatus according to an aspect of the present invention is attached so as to cover the periphery of a sliding portion in a plurality of sliding members that repeatedly perform relative displacement, and follows the repeated movement of the sliding members. A deformable breathable bag, a powder contained in the bag, and a blower for blowing air into the bag.

  The rough road durability test device can prevent the powder from adhering to the inner wall of the bag portion by blowing air into the bag portion, the bag portion containing the powder being deformed following the test object. From the point, the state in which the powder is sufficiently scattered in the bag portion can be maintained. That is, the rough road endurance test apparatus can simulate a rough road satisfactorily by introducing the air and driving the test object and the powder contained in the bag portion.

  And in said rough road durability test apparatus, powder disperses only in a bag part and does not leak to an external environment. Therefore, the rough road endurance test apparatus has the effects that the rough road can be simulated well even with a small amount of powder, the external environment is not polluted, and the powder can be easily collected and reused.

It is a schematic block diagram of the rough road durability test apparatus of Embodiment 1.

Hereinafter, the rough road durability test apparatus of the present invention will be described in detail with reference to the drawings.
[Embodiment 1]
Overall configuration The rough road durability test apparatus 1 according to the first embodiment is affected by fine powder contained in sand, mud, exhaust gas, etc., particularly when the car travels on a rough road, etc. A part that can be easily attached is used as a test object S, and the powder 20 is used for a durability test that simulates a rough road using a simulated material such as sand. In particular, the rough road durability test apparatus 1 uses the test object S as a component including a plurality of sliding members (cylinder S ₁ and piston rod S _{2 in} FIG. 1) that repeatedly perform relative displacement. This is used for examining the influence when the powder 20 is caught in the sliding portion or the powder 20 is deposited on the sliding portion.

  The rough road durability test apparatus 1 includes the above-described powder 20, the bag portion 10, and the air blowing portion 30, and covers the periphery of the sliding portion between the plurality of sliding members described above as the test target S. Air is blown into the bag portion 10 from the blower portion 30 in a state where the bag portion 10 containing the powder 20 is attached. The rough road durability test apparatus 1 allows the air that has been blown through the bag portion 10 to be out of the bag portion 10 as having air permeability, and follows the repeated movement of a plurality of sliding members as having flexibility. One of the features is the point of deformation. Hereinafter, each element will be described.

-Test object The test object S includes parts and assemblies including a plurality of sliding members that are relatively displaced by reciprocating reciprocating motion. The reciprocating motion may be linear motion or rotational motion. Examples of parts that perform linear motion include shock absorbers (sliding members: cylinder S ₁ and piston rod S ₂ ), door stays (sliding members: cylinder and rod), and other weather strips or glass runs and window glass. And the like (each member forming the set becomes a sliding member). Examples of the parts that perform the rotational motion include door hinges (sliding members: shafts and bearings), and other combinations of outer door handles and their fixtures (each of which serves as a sliding member). Examples of the test object S include parts and assemblies composed of two sliding members, parts composed of three or more sliding members, for example, parts that can be expanded and contracted with a plurality of nests. It is done.

.. Drive and Support of Test Object The rough road durability test apparatus 1 includes a drive source 50 and a support unit 60 so that the test object S can stably perform reciprocal reciprocation. The drive source 50 and the support unit 60 may be appropriately selected according to the motion state of the test object S.

For example, an electric cylinder can be used as the drive source 50 for the test object S that performs linear motion. The drive source 50 is used by being fixed to a fixed object (not shown). FIG. 1B shows a state where the cylinder of the electric cylinder is fixed and the rod extends from the cylinder. As the support portion 60 for the test object S that performs linear motion, for example, a fixed support portion 62 that fixes one sliding member (cylinder S _{1 in} FIG. ₁ ) so as not to move, and the other connected to the drive source 50. which comprises a movable support 64 for linearly movably supported slide member (in FIG. 1 the piston rod S ₂₎ for one of the sliding members and the like. As shown in FIG. 1, the support portion 60 has a rigid body or the like that integrally includes a fixed support portion 62 and a movable support portion 64, so that the rigidity is enhanced, and the other sliding member supported by the movable support portion 64 is stable. And can perform linear motion. The arrangement direction of the sliding member by the support part 60 can be selected as appropriate. As shown in this example, the support portion 60 can be provided so that the movement direction of the sliding member is parallel to the vertical direction, and the movement direction is parallel to the horizontal direction.

  For example, an electric motor can be used as the drive source 50 for the test object S that performs the rotational motion. As the support portion 60 for the test object S that performs the rotational movement, for example, a fixed support portion that fixes one sliding member so as not to move, and the other sliding member that is connected to the drive source 50 is used as one sliding member. And a movable support portion that supports a rotational movement within a predetermined angle range. For example, when the test object S is a rod-shaped body, one end may be fixed to the fixed support portion, and the other end may be supported by the movable support portion so as to perform a rotational motion that draws an arc.

  In addition, the rough road durability test apparatus 1 can include a slider 640 on the movable support portion 64, a guide 66 along the movement path of the movable support portion 64, and the like so that the sliding member can move smoothly.

-Powder The powder 20 simulates the powder which may be generated on a rough road as described above, and is included in the bag portion 10 so as to be dispersible. The usage-amount (g) of the powder 20 can be selected suitably. The powder 20 can use various materials, sizes, and shapes.

  As materials, for example, various materials defined in JIS Z 8901 (2006) “Test Powder and Test Particles” can be used. Examples include silica sand, talc, and Kanto loam.

  About a magnitude | size, it can select suitably. For example, only powder having a uniform size can be used for the powder 20, but as shown in this example, when fine mixed powder having different sizes is used for the powder 20, the fine powder is applied to the inner wall of the bag portion 10 by air. It is considered that the coarse powder inhibits the film from being pressed and adheres, and it is easy to maintain the state in which the powder 20 is dispersed in the bag portion 10 during the test. In FIG. 1, the powder 20 is exaggerated for easy understanding.

-Bag part The bag part 10 is attached so that the circumference | surroundings of the sliding location in the sliding member of the test object S may be covered, the powder 20 is accommodated in the inside, and shall satisfy the following three conditions. .
(1) It has a size that can accommodate the sliding portion of the test object S and its vicinity.
(2) The encapsulated powder 20 does not fall off and has air permeability that allows air introduced by the blower 30 to escape.
(3) When the test object S is performing reciprocal reciprocation, the bag portion 10 attached to the test object S has such flexibility that it can be deformed following the reciprocation.

  The bag portion 10 of this example includes a cylindrical main body portion 12 having both ends opened, and an air introduction portion 13 that is provided in the main body portion 12 and introduces air from the blower portion 30 into the main body portion 12. That is, the bag portion 10 in this example has at least three openings. The vicinity of the two openings is fixed portions 14 and 16 that are fixed to the sliding members of the test object S, respectively. For example, in the state where the test object S is inserted and arranged from one opening to the other opening, the fixing portions 14 and 16 have a size around the sliding member (such as an outer diameter) in the vicinity of the opening. It can be formed by shrinking together and tightening with a restraining tool (not shown) such as a restraining band. Before attaching the bag part 10 to the test object S, the opening part and the vicinity thereof are sized to allow the test object S to be inserted, and the bag part 10 can be easily attached to the test object S by reducing the size after the insertion. . Further, by tightening with a restraining tool, the bag portion 10 can be firmly fixed to a predetermined position of the test object S, and leakage of the powder 20 from the fixing portions 14 and 16 can be prevented.

  Cloth, paper, etc. can be utilized for the constituent material of the main-body part 12 of the bag part 10 which satisfy | fills said (1)-(3). Any of woven fabric, non-woven fabric and knitted fabric can be used. A woven fabric having a texture (particularly fine) according to the size of the powder 20 may be selected so that the powder 20 does not leak from the texture. What is necessary is just to select what has sufficient fabric weight etc. according to the magnitude | size of the powder 20, so that the powder 20 may not leak out. As the knitted fabric, one having a stitch (particularly fine) according to the size of the powder 20 may be selected so that the powder 20 does not leak from the stitch.

  As the main body 12, for example, any of a woven fabric woven into a cylindrical shape, a nonwoven fabric formed into a cylindrical shape, and a knitted fabric knitted into a cylindrical shape can be used. Or the main-body part 12 can be formed by sewing or pasting the raw material of a suitable plane shape into a cylinder shape. Or the form which forms the main-body part 12 by attaching the fastener which can be opened and closed repeatedly, such as a surface fastener and a line fastener, to the periphery of the raw material of a suitable plane shape, etc., and fastening a fastener and making it cylindrical. can do. This form can easily construct a state in which a predetermined portion of the test object S is covered with the bag part 10 by fastening a fastener after arranging a planar material so as to surround the periphery of the test object S. Therefore, this form can arrange | position the bag part 10 with respect to the test object S of arbitrary shapes and magnitude | sizes easily.

  The air introduction part 13 is a cylindrical member to which the air blowing part 30 is connected via a connecting member 32 such as a hose. The air introduction part 13 has a higher rigidity than the main body part 12, for example, a molded product of resin or metal. The connecting member 32 or the like may be directly connected to the main body portion 12 of the bag portion 10. However, by providing the rigid air introduction portion 13, the connecting member 32 and the like can be easily fixed, and the air is stabilized in the bag portion 10. Can be introduced.

  The shape and size (outer diameter, length, etc.) of the air introduction part 13 can be appropriately selected according to the connecting member 32. In this example, it is a cylindrical body. Moreover, in this example, the arrangement position of the air introduction part 13 is set to the one fixing part 14 side located on the lower side in the vertical direction. The arrangement position of the air introduction part 13 can be selected as appropriate, and can be, for example, an arbitrary position of the other fixing part 16 side, an intermediate region sandwiched between the fixing parts 14 and 16, or the like.

  In addition, if the bag part 10 is provided with a powder feeding part (not shown) so that the powder 20 can be introduced into the bag part 10 after the bag part 10 is attached to the test object S, the powder is generated when the bag part 10 is attached. 20 is preferred because it does not fall off the bag part 10 and does not scatter around the bag part 10 and is excellent in workability. The powder feed part can be opened and closed repeatedly, and when attaching fasteners such as hook-and-loop fasteners and wire fasteners to prevent leakage of the powder 20 from the powder feed part, it is easy to introduce and take out the powder 20 Can be kept open during testing and excellent workability.

-Air blower The air blower 30 is used for blowing air into the bag 10 and maintaining the powder 20 contained in the bag 10 scattered in the bag 10. The blower 30 can use a commercially available blower.

Test Method The procedure for performing a durability test using the rough road durability test apparatus 1 will be described below. Here, the test object S will be described as an example in which linear motion such as a shock absorber is repeated, and two sliding members are arranged coaxially.

.. Bag part attaching step First, the bag part 10 is attached to the test object S. The bag portion 10 is fixed to the test object S so that the sliding portion between the two sliding members that reciprocate as described above is covered with the bag portion 10. For example, if the main body portion 12 is formed in a cylindrical shape in advance, the end portion of _one sliding member (cylinder S ₁ ) is exposed from one opening portion of the bag portion 10 and the other opening portion is exposed to the other. The test object S is inserted into the main body portion 12 of the bag portion 10 so that the end portion of the sliding member (piston rod S ₂ ) is exposed and the intermediate region of the main body portion 12 covers the outer periphery of the sliding portion. Next, the fixing portions 14 and 16 are formed by shrinking the vicinity of each opening as described above. By doing so, a space having a predetermined size corresponding to the size of the main body portion 12 can be formed between the test object S and the main body portion 12 of the bag portion 10. The powder 20 is supplied into the main body 12 (the space) from the powder supply unit. By this step, the bag portion 10 containing the powder 20 can be attached to the test object S.

-Arrangement process to apparatus The test object S provided with the bag part 10 and the powder 20 is fixed to the support part 60. In this example, the support portion 60 is provided so that the fixed support portion 62 is on the lower side in the vertical direction and the movable support portion 64 is on the upper side in the vertical direction, and the one sliding member (cylinder S ₁ ) that is not moved is fixedly supported. The other sliding member (piston rod S ₂ ) that is moved by the drive source 50 is attached to the movable support portion 64. Thus, when the drive source 50 is driven, the other sliding member (piston rod S ₂ ) moves up and down with respect to the _one sliding member (cylinder S ₁ ). A blower unit 30 is connected to the air introduction unit 13 of the bag unit 10 via a connecting member 32.

-Test process The drive source 50 and the air blower 30 are driven, and an endurance test is performed. In this example, at the time of the test, the drive source 50 repeatedly causes the test object S to repeatedly perform linear up and down movements, and the air from the air blower 30 from the air introduction part 13 provided on the lower side in the vertical direction into the bag part 10. Continue to supply. The air volume from the blower unit 30 may be appropriately selected. Moreover, air can be intermittently supplied according to the simulated environment. By introducing air, the powder 20 in the bag part 10 flies in the bag part 10 and maintains a dispersed state. And with the up-and-down movement of the test object S, the bag part 10 repeats the extended state (FIG. 1 (A)) and the contracted state (FIG. 1 (B)). By this deformation of expansion and contraction, it is possible to effectively prevent the powder 20 in the bag portion 10, particularly a fine powder, from adhering to the inner wall of the bag portion 10 in the form of a film. That is, the state in which the powder 20 flies can be maintained even by the deformation of the bag portion 10 itself.

-Effects The rough road durability test apparatus 1 according to the first embodiment is configured such that air is blown into the bag 10 and the bag 10 containing the powder 20 is deformed following the reciprocation of the test object S. The state where 20 is scattered and dispersed in the bag portion 10 can be well maintained. That is, the rough road durability test apparatus 1 can simulate a bad road well. In the rough road durability test apparatus 1, since the powder 20 circulates in the bag part 10, the rough road can be satisfactorily simulated even if the amount of the powder 20 used is small.

  In particular, in the rough road durability test apparatus 1 shown in this example, the test object S is arranged so that the movement direction of the test object S is parallel to the vertical direction, and air is introduced downward from the lower side in the vertical direction. From the point of blowing up the powder 20 from above, the dispersion state of the powder 20 can be formed better. Further, when the air escapes from below to above, the powder 20 can move so as to spiral around the test object S as the central axis. Also from this point, it is considered that the dispersed state of the powder 20 can be satisfactorily formed.

  The rough road durability test apparatus 1 blows air and reciprocates the test object, but the powder 20 does not leak from the bag portion 10 and does not pollute the external environment. Therefore, even when the rough road durability test apparatus 1 is housed in, for example, a constant temperature and humidity chamber and used as a simulation test of an arbitrary temperature and humidity environment, it can be performed without polluting the inside of the tank.

  Furthermore, since the rough road durability test apparatus 1 is contained in the bag part 10, the powder 20 is not substantially lost, can be efficiently recovered, and the reuse of the powder 20 is easy.

[Modification 1]
As the bag portion 10, a bag portion having a collar portion (not shown) protruding from the inner wall of the main body portion 12 can be used. By providing the collar portion, it is considered that the powder 20 pressed against the inner wall of the main body portion 12 by air is likely to be inhibited from adhering to the inner wall. The shape, size, number, arrangement state, etc. of the collar portion can be appropriately selected.

  In terms of the number, the collar portion can be either a single continuous projecting piece or a plurality of projecting piece groups arranged at a predetermined interval. When the main body 12 is a cylindrical body that cannot be opened and closed, either a continuous protruding piece or a plurality of protruding piece groups can be formed. When the main body portion 12 is a cylindrical body that can be opened and closed by the above-described fastener, the bag portion 10 having the collar portion can be easily attached to the test object S.

  When the arrangement state is described, for example, when the collar portion is provided so as to draw a spiral on the inner wall of the main body portion 12, it is considered that a swirling airflow is easily formed. In addition, the collar part can be provided along the circumferential direction of the main body part 12, or can be provided so as to be parallel to the direction from one opening part toward the other opening part.

  As the constituent material of the collar portion, the same material as that of the main body portion 12 can be used. If the main body 12 and the collar are made of cloth or paper, the collar can be easily formed by sewing or gluing.

  The rough road durability test apparatus according to the present invention is a component of an automobile and is attached to a place that is easily affected by sand, mud, or the like, and is used for durability such as a part or assembly including a sliding member that performs relative displacement. Available for testing. Moreover, since the rough road durability test apparatus of the present invention has a simple configuration, it can be attached to a test vehicle and a durability test can be performed.

DESCRIPTION OF SYMBOLS 1 Rough road durability apparatus 10 Bag part 12 Main body part 13 Air introducing | transducing part 14,16 Fixed part 20 Powder 30 Air blower 32 Connecting member 50 Drive source 60 Support part 62 Fixed support part 64 Movable support part 640 Slider 66 Guide S Test object S ₁ cylinder S ₂ piston rod

Claims (1)

A breathable bag portion that is attached so as to cover the periphery of the sliding portion in the plurality of sliding members that repeatedly perform relative displacement, and deforms following the repeated movement of the sliding member;
Powder contained in the bag portion;
A rough road durability test apparatus comprising a blower for blowing air into the bag.

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