Whip test device for brake hose

Abstract

To provide a whip test device for brake hose which has a small number of rotation parts, a small size, and no risk of failure and damage.SOLUTION: A rotation part 10 has: a first rotation plate 11 which is provided to be driven to rotate around a first axis 15; a second rotation plate 12 which is provided to be rotatable around a second axis 19 parallel to the first axis, on the first rotation plate separated from an axis center of the first axis by a prescribed distance R; a drive part 13 for driving the first rotation plate 11 to rotate; and a power transmission part 14 for transmitting power of the first rotation plate to the second rotation plate, so that the second rotation plate rotates in a direction opposite to a direction of the first rotation plate at the same rotation number, by driving of the first rotation plate. A non-rotation part 30 is provided on the same axis with the first axis of the rotation part 10. A movable side connection part 21 to which one end of a brake hose BH to be inspected is connected is provided on the second rotation plate 12 of the rotation part 10, and a fixing side connection part 33 to which the other end of the brake hose BH is connected is arranged on the non-rotation part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a whip test device for a brake hose. [Background technology]

[0002] As conventional durability testing methods for hoses, Patent Document 1 describes a method in which an impact oil pressure is applied to a hose to be tested while it is fixed in an L-shape or U-shape, and a method in which one end of the hose is fixed and the other is moved back and forth along a predetermined axis or moved along a circular locus to apply impact oil pressure while imparting a swinging motion to the hose. Patent Document 1 also describes a method in which a portion of the hose in the longitudinal direction is bent and imparted with a rotational motion about the hose axis while applying impact oil pressure so that a durability test can be performed over the entire circumferential direction of the hose.

[0003] The Japanese Industrial Standards (JIS) D2601 specifies a whip test method for non-mineral oil hydraulic brake hoses used in hydraulic brake devices for automobiles. The whip test device 100 specified in this whip test method includes a rotating part 103 in which both ends of a horizontal plate 102 are rotatably attached at positions 100 mm away from the centers of two rotating plates 101a and 101b, and a non-rotating part 104 arranged parallel to the horizontal plate 102 on the same horizontal plane as the centers of the two rotating plates 101a and 101b, as shown in Fig. 10. In this whip test device 100, one end of a hose H is connected to the non-rotating part 104, and the other end of the hose H is connected to the horizontal plate 102 of the rotating part 103. Water pressure is applied to the hose H while giving the hose H a circular motion with a diameter of 203.2 mm ± 0.25 mm, and the elapsed time until the hose H breaks and the pressure drops is recorded.

[0004] However, the whip test device 100 described in the JIS has two rotating plates 101a, 101b in the rotating part 103, which requires a large number of bearings and increases the size of the device. In addition, misalignment of the rotation of the multiple bearings on each rotating plate can cause excessive compressive or tensile forces to act on the horizontal plate 102, which can damage the horizontal plate 102 and the bearings. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 4-203950 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE PRESENT EMBODIMENT The present invention has been made in consideration of the above-mentioned problems in the conventional art, and an object of the present invention is to provide a whip testing device for brake hoses which has few rotating parts, is small in size, and is free from the risk of malfunction or damage. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention has the following means. (1) A rotating unit including: a first rotating plate provided so as to be rotatable around a first axis; a second rotating plate provided on the first rotating plate at a predetermined distance from the axis of the first axis so as to be rotatable around a second axis parallel to the first axis; a driving unit that drives the first rotating plate to rotate; and a power transmission unit that transmits power of the first rotating plate to the second rotating plate so that the second rotating plate rotates at the same rotation speed as the first rotating plate in the opposite direction as the first rotating plate when driven by the first rotating plate; a non-rotating part provided coaxially with the first axis of the rotating part, A movable side connecting portion is provided on the second rotating plate of the rotating portion to which one end of the brake hose to be inspected is connected, and a fixed side connecting portion is provided on the non-rotating portion to which the other end of the brake hose is connected. (2) In the above-mentioned means 1, The power transmission portion is a timing belt that is stretched between a first gear provided on the first shaft and a second gear provided so as to be rotatable integrally with the second rotating plate. (3) In the above means 1 or 2, The movable side connecting portion and the fixed side connecting portion are provided in plurality so that a plurality of the brake hoses are connected, and the arrangement of the plurality of the movable side connecting portions relative to the second rotating shaft is the same as the arrangement of the plurality of the fixed side connecting portions relative to the center of the non-rotating portion. Effect of the Invention

[0008] The present invention has a rotating part that includes a first rotating plate and a second rotating plate provided on the first rotating plate, and the brake hose to be inspected is connected to the second rotating plate, thereby having the advantage of having few rotating parts, being compact, and being free from the risk of malfunction or damage. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a brake hose whip test device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a front view of a rotating part of the brake hose whip test device of FIG. 1. [Diagram 3] FIG. 2 is a cross-sectional view of a rotating part of the brake hose whip test device shown in FIG. [Figure 4] FIG. 2 is a side view of a non-rotating part of the brake hose whip test device of FIG. 1. [Diagram 5] FIG. 2 is a front view showing the operation of the brake hose whip test device of FIG. 1. [Figure 6] FIG. 6 is a front view showing the operation of the brake hose whip test device following FIG. 5 . [Figure 7] FIG. 7 is a front view showing the operation of the brake hose whip test device following FIG. 6. [Figure 8] Diagram showing the circular motion of a brake hose. [Figure 9] FIG. 4 is a front view of a rotating portion of a brake hose whip test device according to another embodiment of the present invention. [Figure 10] FIG. 1 is a schematic perspective view of a conventional brake hose whip test device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0011] FIG. 1 shows a brake hose whip test device (hereinafter simply referred to as "test device") 1 according to an embodiment of the present invention.

[0012] The test device 1 has a horizontal frame 2, a vertical frame 3 provided perpendicular to the horizontal frame 2, and a slide table 4 provided adjacent to the horizontal frame 2, on a stand (not shown). The horizontal frame 2 and the vertical frame 3 are provided with a rotating section 10, and the slide table 4 is provided with a non-rotating section 30.

[0013] As shown in FIG. 2, the rotating unit 10 has a first rotating plate 11, a second rotating plate 12, a driving unit 13, and a power transmission unit 14.

[0014] As shown in FIG. 3, the first rotating plate 11 is provided so as to be rotatable around a horizontal first shaft 15. One end of the first shaft 15 is fixed to the vertical frame 3, and the middle part is supported by a support frame 5 that rises vertically from the horizontal frame 2, and the first rotating plate 11 is provided at the tip side. As shown in FIG. 2, the first rotating plate 11 is substantially elliptical in shape and has a cylindrical shaft portion 11a at its center. The first rotating plate 11 is provided so as to be rotatable around the first shaft 15 by fitting the shaft portion 11a to the first shaft 15 via a bearing 16. The second rotating plate 12, which will be described later, is attached to one end of the first rotating plate 11, and a weight 17 having the same weight as the second rotating plate 12 is attached to the other end. A driven pulley 18 is attached to the shaft portion 11a of the first rotating plate 11 so as to be rotatable together with the first rotating plate 11. A first gear 26 constituting the power transmission unit 14 is fixed to the tip of the first shaft 15 protruding from the first rotating plate 11. The shape of the first rotating plate 11 is not limited to a substantially elliptical shape, but may be a circular shape or the like.

[0015] The second rotating plate 12 is provided so as to be rotatable around a second shaft 19 parallel to the first shaft 15. The second shaft 19 is fitted through a bearing 20 into a hole 11b formed on the first rotating plate 11 at a position spaced a predetermined distance R from the center of the first shaft 15. The second rotating plate 12 is substantially cross-shaped as shown in FIG. 2, and its center is attached to the tip of the second shaft 19 so as to be rotatable together with the plate. The second rotating plate 12 is provided with a movable side connecting portion 21 made of a coupling to which one end of the brake hose BH to be inspected is connected at four ends. The second shaft 19 is provided with a second gear 27 constituting the power transmission portion 14 so as to be rotatable together with the second rotating plate 12. The shape of the second rotating plate 12 is not limited to a substantially cross shape, and can be any shape, such as a straight (rod) shape or a circular shape, depending on the number of brake hoses BH.

[0016] The drive unit 13 is composed of a drive motor 23 attached to a motor mounting base 22 slidably provided on the vertical frame 3, and a drive belt 25 stretched between a drive pulley 24 of the drive motor 23 and the driven pulley 18 of the first rotating plate 11. The tension of the drive belt 25 can be adjusted by moving the motor mounting base 22 of the drive motor 23.

[0017] The power transmission section 14 is composed of a first gear 26 fixed to the tip of the first shaft 15, and a timing belt 28 stretched between a second gear 27 attached to the second shaft 19 so as to be rotatable integrally with the second rotating plate 12. The first gear 26 and the first gear 27 have the same number of teeth. The timing belt 28 is pressed by an intermediate gear 29 so that the tension of the timing belt 28 can be adjusted. The timing belt 28 has teeth formed on its inner circumferential surface that mesh with the first gear 26, the second gear 27, and the intermediate gear 29. The intermediate gear 29 is rotatably attached on the first rotating plate 11 between the first shaft 15 and the second shaft 19 so as to be movable along a guide 11c.

[0018] As shown in FIG. 4, the non-rotating portion 30 has a base 31 and a fixed plate 32.

[0019] The base 31 is slidable in parallel with the first shaft 15 of the rotating unit 10 along a rail (not shown) provided on the slide base 4, so that the position can be adjusted.

[0020] The fixed plate 32 is in the form of a rectangular plate and is provided on the base 31, with its center on the axis of the first shaft 15. The fixed plate 32 is provided, on a surface parallel to the second rotating plate 12, with four fixed side connecting parts 33 consisting of couplings to which the other ends of the brake hoses BH to be inspected are connected. The four fixed side connecting parts 33 of the fixed plate 32 are arranged in the same manner as the four movable side connecting parts 21 of the second rotating plate 12. Each fixed side connecting part 33 is connected to a pressure source 34 so that the brake hoses BH to be inspected can be pressurized up to a predetermined pressure. The pressure inside the brake hoses BH can be detected by a pressure detection sensor 35.

[0021] Next, the operation of the test apparatus 1 when performing a whip test on the brake hose BH using the test apparatus 1 configured as above will be described.

[0022] 1, one end of each of the four brake hoses BH to be tested is connected to the fixed side connecting portion 33 of the fixed plate 32, and the other end is connected to the movable side connecting portion 21 of the second rotating plate 12. The position of the fixed side connecting portion 33 is adjusted by moving the base 31 of the non-rotating portion 30 so that the brake hoses BH do not bend excessively.

[0023] With pressurized liquid, for example at a pressure of 1.7 MP, supplied from the pressure source 34 to each brake hose BH, the drive motor 23 of the drive unit 13 is driven to rotate the first rotating plate 11 at, for example, 800 revolutions per minute via the drive pulley 24, drive belt 25, and driven pulley 18.

[0024] As shown in Fig. 5, when the first rotating plate 11 rotates counterclockwise, the right side portion of the timing belt 28 in Fig. 5 is pulled and the left side portion is loosened because the first gear 26 is fixed, and the second rotating plate 12 rotates clockwise around the second shaft 19 due to the difference in tension between the right and left sides. As a result, as shown in Figs. 5 to 7, among the four movable side connecting parts 21 (A, B, C, D) of the second rotating plate 12, the positional relationship in which A and B are on top and C and D are on the bottom is maintained while the second rotating plate 12 turns counterclockwise around the first shaft 15. As a result, as shown in Fig. 8, the movable side connecting parts 21 of the four brake hoses BH each perform a circular motion with the same diameter, specifically, a diameter of 203.2 mm ± 0.25 mm, relative to the fixed side connecting part 33.

[0025] When the brake hose BH is eventually broken, the pressure detected by the pressure detection sensor 35 decreases, and the elapsed time from the start of the test is recorded.

[0026] The test device 1 of this embodiment has a rotating part 10 including a first rotating plate 11 and a second rotating plate 12 provided on the first rotating plate 11, and a brake hose BH to be inspected is connected to the second rotating plate 12. Conventionally, a part having four movable connecting parts (horizontal plate 102) performs circular motion by two rotating plates 101a, 101b (twin rotors). For this reason, a total of four bearings were required in the past, including bearings at both ends of the horizontal part 102 and bearings on the two rotating plates 102a, 102b. In contrast, in the present invention, a part having four movable connecting parts 21 performs circular motion by one second rotating plate 12 (single rotor). For this reason, in the present invention, only one bearing 20 of the second rotating plate 12 is required, and even if the bearing 16 of the first rotating plate 11 is included, a total of two bearings are sufficient.

[0027] Therefore, in the present invention, the number of rotating parts and the number of bearings are small, resulting in less noise. Also, the second rotating plate 12 is small in size because it is provided on the first rotating plate 11. Furthermore, there is no part to which excessive force is applied, such as the horizontal plate 102 of the conventional testing device 100, so there is no risk of failure or damage.

[0028] The present invention is not limited to the above-described embodiment, and various changes and modifications are possible within the scope of the claims.

[0029] For example, in the above embodiment, the four brake hoses BH to be inspected are arranged in a circle around the second shaft 19, but if there are two or three brake hoses BH to be inspected, they may be arranged in a horizontal straight line including the axis of the second shaft 19, as shown in FIG. 9.

[0030] Further, in the power transmission unit 14, instead of the timing belt 28, the first gear 26 and the second gear 27 may be meshed with each other via a chain or an intermediate gear. [Explanation of symbols]

[0031] 1…Whip test device 10...Rotating part 11…First rotating plate 12...Second rotating plate 13...Drive unit 14...Power transmission section 15…1st axis 19…Second axis 21...Movable side connection part 26…1st gear 27…2nd gear 28...Timing belt 30…Non-rotating part 33…Fixed side connection part

Claims

1. a rotating unit including a first rotating plate provided so as to be rotatable around a first axis, a second rotating plate provided on the first rotating plate at a predetermined distance from the axis of the first axis so as to be rotatable around a second axis parallel to the first axis, a driving unit that drives the first rotating plate to rotate, and a power transmission unit that transmits power of the first rotating plate to the second rotating plate so that the second rotating plate rotates at the same rotation speed as the first rotating plate in the opposite direction as the first rotating plate when driven by the first rotating plate; a non-rotating portion provided coaxially with the first axis of the rotating portion, a movable side connector to which one end of a brake hose to be inspected is connected is provided on the second rotating plate of the rotating part, and a fixed side connector to which the other end of the brake hose is connected is provided on the non-rotating part.

2. 2. The brake hose whip test device according to claim 1, wherein the power transmission unit is a timing belt stretched between a first gear provided on the first shaft and a second gear provided so as to be rotatable integrally with the second rotating plate.

3. 3. The brake hose whip test device according to claim 1, wherein a plurality of the movable side connecting portions and the fixed side connecting portions are provided so that a plurality of the brake hoses are connected to each other, and an arrangement of the plurality of the movable side connecting portions relative to the second rotating shaft is the same as an arrangement of the plurality of the fixed side connecting portions relative to the center of the non-rotating portion.

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