Harness clamp

Abstract

To provide a harness clamp capable of suppressing falling of a harness.SOLUTION: A harness clamp 10 contains: a base part 21; a standing part 22 that is extended from one end part of the base part; a fixed part 23 that is extended from a tip end part of the standing part, and is fixed to a fixed mating; a folding part 24 that is folded from the other end part of the base part; a first extension part 25 that is extended from the tip end part of the folding part, and forms a first clamp space S1 between the base part and the folding part; and a second extension part 26 that is extended via a folding part C4 from the tip end part of the first extension part, and forms a second clamp space S2 between the base part and the standing part. The tip end part of the second extension part is a free end part. A first interval G1 is formed between the tip end part of the second extension part and the standing part. A second interval G2 is formed between the folding part and the base part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a harness clamp.

Background Art

[0002] There has been proposed a harness clamp including a base end portion integrally provided on a harness mounting surface and a holding portion that curves along the outer peripheral surface of the harness from the base end portion and holds the harness in a state of covering the outer peripheral surface of the harness (see, for example, Patent Document 1). A gap smaller than the diameter of the harness is formed between the tip end portion of the holding portion and the harness mounting surface, and the harness is inserted through this gap, whereby the outer peripheral surface of the harness is clamped by the holding portion of the harness clamp.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the harness clamp described in Patent Document 1, depending on the use environment of the harness clamp (for example, an environment where vibration is applied to the harness clamp), there is a problem that the harness clamp passes through the above gap and falls off.

[0005] The present invention has been made to solve such problems, and provides a harness clamp capable of suppressing the harness from falling off.

Means for Solving the Problems

[0006] The harness clamp according to the present invention includes a harness clamp body, wherein the harness clamp body a base portion, an upright portion extending in a direction away from the base portion from one end of the base portion via a first bending portion, a fixing portion extending to the side opposite to the base portion from the tip of the upright portion via a second bending portion and being fixed to an object to be fixed, a folded-back portion folded back from the other end of the base portion, a first extension portion extending substantially parallel to the base portion from the tip of the folded-back portion toward the upright portion and further extending in a direction approaching the base portion via a third bending portion, and forming a first clamping space between the base portion and the folded-back portion, a second extension portion extending in a direction away from the base portion from the tip of the first extension portion via a fourth bending portion and forming a second clamping space between the base portion and the upright portion, the tip of the second extension portion is a free end, a first interval is formed between the tip of the second extension portion and the upright portion, a second interval is formed between the fourth bending portion and the base portion, the first clamping space is a space for clamping a harness, the second clamping space is a space for clamping the harness deformed by passing through the second space from the first clamping space, when the length of the first interval is A, the length of the second interval is B, the diameter of the harness is φ, and the maximum diameter of the deformed harness is a, the relationships B < φ and A < a are satisfied.

[0007] With such a configuration, it is possible to suppress the harness from falling off.

[0008] This is because the harness clamp is provided with a plurality of clamping functions, that is, a first clamping space functioning as a first clamp and a second clamping space functioning as a second clamp.

[0009] In the above harness clamp, The folding portion extends in an arc shape, The diameter of the folding portion may be approximately equal to the diameter of the harness.

[0010] Also, in the above harness clamp, The harness clamp body may be manufactured by bending a metal plate.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a harness clamp that can prevent the harness from falling off.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0013] Hereinafter, a harness clamp 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings. In each figure, corresponding components are denoted by the same reference numerals, and redundant descriptions are omitted.

[0014] Figure 1(a) is a cross-sectional view of the harness clamp 10 and the harness 30 within the first clamp space S1, Figure 1(b) is a cross-sectional view of the harness clamp 10 and the harness 30 passing through the second interval G2, and Figure 1(c) is a cross-sectional view of the harness clamp 10 and the harness 30 within the second clamp space S2. Figures 1(a) to 1(c) show a drive unit including a harness and a harness clamp. More specifically, the drive unit has a motor, a rotation angle sensor, a harness, a harness clamp, and a case (a fixed counterpart 40) (not shown). The harness 30 is connected to the rotation angle sensor. The harness clamp 10 is attached to a case (a fixed counterpart 40) that houses the motor.

[0015] The harness clamp 10 is a bracket having a function of clamping the harness 30. As shown in Figure 1, the harness 30 includes a plurality of core wires 31 and a cylindrical covering portion 32 having flexibility to cover the plurality of core wires 31. The core wires 31 are, for example, lead wires. The covering portion 32 is, for example, an acrylic rubber tube. The harness clamp 10 is shaped to prevent the harness 30 from falling out of the harness clamp 10 as described later.

[0016] As shown in FIG. 1, the harness clamp 10 includes a harness clamp body 20. The harness clamp body 20 includes a base portion 21, an upright portion 22 extending in a direction away from the base portion 21 from one end portion of the base portion 21 via a first bending portion C1, a fixing portion 23 extending from the tip end portion of the upright portion 22 to the opposite side of the base portion 21 via a second bending portion C2 and fixed (e.g., screwed) to an object to be fixed, a folded-back portion 24 extending in an arc shape from the other end portion of the base portion 21 and folded back, a first extension portion 25 extending in a direction substantially parallel to the base portion 21 from the tip end portion of the folded-back portion 24 toward the upright portion 22 and further extending in an oblique direction approaching the base portion 21 via a third bending portion C3, and forming a first clamp space S1 between the base portion 21 and the folded-back portion 24, and a second extension portion 26 extending in an oblique direction away from the base portion 21 from the tip end portion of the first extension portion 25 via a fourth bending portion C4 and forming a second clamp space S2 between the base portion 21 and the upright portion 22. The tip end portion of the second extension portion 26 is a free end portion.

[0017] The first clamp space S1 is a space for clamping the harness 30. The first clamp space S1 is formed by the base portion 21, the folded-back portion 24, and the first extension portion 25. A second interval G2 is formed between the fourth bending portion C4 and the base portion 21. When the length of the second interval G2 is B and the diameter of the harness 30 is φ, the relationship between the two is B < φ. Also, when the diameter of the folded-back portion 24 is C and the diameter of the harness 30 is φ, the relationship between the two is C ≒ φ. Due to these relationships, the first clamp space S1 functions as a first clamp for clamping the harness 30 inserted into the first clamp space S1.

[0018] Note that the harness 30 is inserted into the first clamp space S1 via the first interval G1 and the second interval G2.

[0019] When the harness clamp 10 is fixed to a vibrating stationary object, the vibration may cause the harness 30 to pass through the second interval G2 (harness detachment). In particular, as shown in FIGS. 2(a) to 2(c), when the harness clamp 10 is fixed with the folded-back portion 24 facing upward and the fixed portion 23 facing downward, in addition to the vibration, the harness 30 is also affected by its own weight, making it easier for the harness 30 to pass through the second interval G2.

[0020] Therefore, a second clamp space S2 is provided.

[0021] The second clamp space S2 is a space for clamping the harness 30 (see FIGS. 1(c) and 2(c)) that has passed through the second interval G2 and deformed into an elliptical shape. The second clamp space S2 is formed by the base portion 21, the standing portion 22, and the second extension portion 26. A first interval G1 is formed between the tip of the second extension portion 26 and the standing portion 22. When the maximum diameter of the harness 30 that has passed through the second interval G2 and deformed into an elliptical shape is a (see FIG. 1(b)) and the length of the first interval G1 is A, the relationship between the two is A < a. Due to this relationship, the first clamp space S1 functions as a second clamp for clamping the harness 30 (see FIGS. 1(c) and 2(c)) that has passed through the second interval G2 and moved to the second clamp space S2 and deformed into an elliptical shape.

[0022] An example of fixing the harness clamp 10 will be described.

[0023] FIG. 3 shows an example in which the harness clamp 10 is fixed to a stationary object 40. As shown in FIG. 3, by fixing the fixed portion 23 to a protruding portion 42 (tip) protruding from the wall surface 41 of the stationary object 40 (for example, by screw fixing), the harness clamp 10 can be fixed to the wall surface 41 of the stationary object 40 in a non-contact state (that is, in a state where a gap G3 is formed between the base portion 21 and the wall surface 41). Fixing the harness clamp 10 to the wall surface 41 of the stationary object 40 in this non-contact state is for the purpose of preventing burrs from the wall surface 41 of the stationary object 40.

[0024] Instead of the above two formulas (the second interval G2 < the diameter φ of the harness 30, the length A of the first interval G1 < the maximum diameter a of the harness 30 deformed into an elliptical shape passing through the second interval G2), the following formulas 1 to 4 may be used. However, as shown in FIG. 4, A is the length of the first interval G1, B is the length of the second interval G2, a is the minor axis (radius) of the harness 30 when passing through the second interval G2, b is the major axis (radius) of the harness 30 when passing through the second interval G2, and φ is the diameter of the harness 30. FIG. 4 is a diagram showing the relationship of each parameter.

[0025] A < 2a ··· (Formula 1) 2b = B ··· (Formula 2) b < φ / 2 < a ··· (Formula 3) a*b = (φ / 2)^2 ··· (Formula 4)

[0026] Formula 1 is a relational expression indicating the prevention of the harness 30 from coming off during deformation. Formula 1 corresponds to the above formula (the length A of the first interval G1 < the maximum diameter a of the harness 30 deformed into an elliptical shape passing through the second interval G2). Formula 2 is a relational expression indicating that it deforms while abutting on the width of the second interval G2. Formula 3 is a relational expression representing the state of the harness 30 during deformation. By substituting Formula 2 into Formula 3, the above formula (the second interval G2 < the diameter φ of the harness 30) is derived. Formula 4 is a relational expression indicating that the cross-sectional area of the harness 30 before deformation and the cross-sectional area of the harness 30 after deformation are constant during deformation.

[0027] Formula 4 is obtained by omitting the pi on both sides assuming that the area of the ellipse (minor side a × major side b × pi) = the area of the circle (radius Φ / 2 × radius Φ / 2 × pi).

[0028] Here, by using Formulas 2 and 4, the minor side b and the major side a can uniquely determine the deformation state from the measured values A, B, and φ as shown in the following Formulas 5 and 6. a = 2*(φ / 2)^2 ÷ B ··· (Formula 5) b = B / 2 ··· (Formula 6)

[0029] Next, substituting Formula 5 into Formula 1, the following Formula 7 containing only the measured values A, B, and φ can be derived. AB < φ^2 ···(Equation 7) Also, substituting Equation 6 into Equation 3 enables derivation of the following Equation 8 in terms of only the measured values A, B, and φ. B < φ ···(Equation 8) As described above, by using Equation 4, the above two Equations 7 and 8 can be derived using only the measured values A, B, and φ without using the parameter "the maximum diameter a of the harness 30 that has passed through the second interval G2 and deformed into an elliptical shape". These two equations are relational expressions that do not depend on the shape during deformation.

[0030] As described above, according to this embodiment, it is possible to suppress the harness 30 from falling off.

[0031] This is because the harness clamp 10 is provided with a plurality of clamp functions, that is, a first clamp space S1 that functions as a first clamp and a second clamp space S2 that functions as a second clamp.

[0032] Also, according to this embodiment, the degree of freedom in the bracket-mounted state can be increased. That is, the harness clamp 10 can be mounted (for example, fixed to the mating part) not only in the posture of FIG. 1 but also in the posture of FIG. 2.

[0033] All of the numerical values shown in the above embodiment are merely examples, and of course, appropriate different numerical values can be used.

[0034] The above embodiment is merely illustrative in every respect. The present invention is not to be construed in a limiting sense by the description of the above embodiment. The present invention can be implemented in various other forms without departing from its spirit or main features.

Explanation of Reference Numerals

[0035] 10... Harness clamp 20... Harness clamp body 21... Base part 22... Upright part 23... Fixed part 24... Folded-back part 25…First extension part 26…Second extension part 30…Harness 31…Core wire 32…Coating part 40…Object to be fixed 41…Wall surface 42…Protrusion C1…First bending part C2…Second bending part C3…Third bending part C4…Fourth bending part G1…First interval G2…Second interval S1…First clamp space S2…Second clamp space

Claims

1. Comprising a harness clamp body, The harness clamp body, A base portion, An upright portion extending in a direction away from the base portion via a first bending portion from one end portion of the base portion, A fixing portion extending to the opposite side of the base portion via a second bending portion from the tip of the upright portion and fixed to a fixing partner, A folded-back portion folded back from the other end portion of the base portion, A first extension portion extending substantially parallel to the base portion from the tip of the folded-back portion toward the upright portion and further extending in a direction approaching the base portion via a third bending portion, forming a first clamping space between the base portion and the folded-back portion, A second extension portion extending in a direction away from the base portion via a fourth bending portion from the tip of the first extension portion, forming a second clamping space between the base portion and the upright portion, and including, The tip of the second extension portion is a free end, A first interval is formed between the tip of the second extension portion and the upright portion, A second interval is formed between the fourth bending portion and the base portion, The first clamping space is a space for clamping a harness, The second clamping space is a space for clamping the harness deformed by passing through the second interval from the first clamping space, A harness clamp satisfying the relationship of B < φ and A < a, where A is the length of the first interval, B is the length of the second interval, φ is the diameter of the harness, and a is the maximum diameter of the deformed harness.

2. The folded-back portion extends in an arc shape, The harness clamp according to claim 1, wherein the diameter of the folded-back portion is substantially equal to the diameter of the harness.

3. The harness clamp according to claim 1, wherein the harness clamp body is manufactured by bending a metal plate.

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