banjo bolt

Abstract

To provide a banjo bolt that allows a small-diameter lateral hole to be formed by press processing while suppressing reduction of a fastening axial force.SOLUTION: A banjo bolt comprises: a head part; and a cylindrical shaft part having a vertical hole extending along a first direction. The head part is connected to one end part of the shaft part in the first direction, and an opening connected to the vertical hole is formed at the other end part of the shaft part in the first direction. The shaft part has at least one groove part and a lateral hole. The at least one groove part is formed in an inner face of the vertical hole, and extends along the first direction and is recessed in a second direction intersecting with the first direction and also in a direction separating from a center line extending in the first direction of the vertical hole. The lateral hole is formed in a bottom of the groove part, and extends in the second direction to connect the vertical hole and the outside of the shaft part.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a banjo bolt.

Background Art

[0002] Patent Document 1 discloses a union bolt including a head and a shaft portion provided at the lower end of the head and having a male screw groove on its outer peripheral surface. In the union bolt of Patent Document 1, the shaft portion has, inside thereof, a vertical hole through which fluid flows in a direction substantially along the axial direction, and a horizontal hole formed by drilling or pressing in a direction substantially orthogonal to the axial direction so as to communicate the vertical hole with the outside.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the union bolt of Patent Document 1, in order to increase the tightening axial force, for example, it is conceivable to reduce the inner diameter of the vertical hole. However, when the inner diameter of the vertical hole becomes small, the dimensions of the portion where the horizontal hole of the shaft portion is formed become large, and it may be difficult to form a small-diameter horizontal hole by pressing.

[0005] An object of the present disclosure is to provide a banjo bolt capable of forming a small-diameter horizontal hole by pressing while suppressing a decrease in the tightening axial force.

Means for Solving the Problems

[0006] A banjo bolt according to an aspect of the present disclosure includes: a head, a cylindrical shaft portion having a vertical hole extending along a first direction inside, and and is provided with The head is connected to one end of the shaft portion in the first direction. A banjo bolt provided with an opening connected to the vertical hole at the other end of the shaft portion in the first direction, wherein the shaft portion is provided on the inner surface of the vertical hole, and has at least one groove portion that extends along the first direction, departs from the center line extending in the first direction of the vertical hole in a second direction intersecting the first direction, and is recessed in a direction away from the center line; and a horizontal hole provided at the bottom of the groove portion and extending in the second direction to connect the inside and outside of the vertical hole and the shaft portion. It has.

Advantages of the Invention

[0007] According to the banjo bolt of the above aspect, a horizontal hole with a small diameter can be formed by pressing while suppressing a decrease in the tightening axial force.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0009] Hereinafter, an example of the present disclosure will be described with reference to the accompanying drawings. The following description is merely illustrative in nature and is not intended to limit the present disclosure, its applications, or its uses. The accompanying drawings are schematic, and the ratios of each dimension, etc. do not necessarily match the actual ones.

[0010] As shown in FIG. 1, a banjo bolt (also referred to as a union bolt) 1 according to an embodiment of the present disclosure includes a head 10 and a cylindrical shaft portion 20. The banjo bolt 1 is made of, for example, carbon steel, alloy steel, boron steel, stainless steel, aluminum, etc. The shaft portion 20 has, for example, a substantially cylindrical shape and extends along a first direction (for example, the Z direction).

[0011] As shown in FIG. 1, the head 10 has, as an example, a substantially hexagonal screw head 12 and a flange 14, and is provided at one end of the shaft portion 20 in the first direction Z. The screw head 12 is located farther from the other end of the shaft portion 20 in the first direction Z than the flange 14. The flange 14 has, for example, a substantially annular shape and is located around a center line CL extending in the first direction Z of the shaft portion 20.

[0012] As shown in FIG. 2, the shaft portion 20 has, for example, a substantially cylindrical shape and has a longitudinal hole 22 extending along the first direction Z inside. The longitudinal hole 22 has, for example, a substantially circular shape, extends from the head 10 to the other end of the shaft portion 20 in the first direction Z, and is connected to an opening 222 provided at the other end of the shaft portion 20 in the first direction Z. The longitudinal hole 22 is formed in the shaft portion 20 by, for example, cold forging. The shape of the longitudinal hole 22 is not limited to a substantially circular shape and may be any other shape.

[0013] As shown in FIG. 3, the shaft portion 20 has at least one groove portion 223 and a transverse hole 24 provided at the bottom 224 of the groove portion 223. The groove portion 223 is provided on the inner surface of the longitudinal hole 22, more specifically, on the peripheral wall portion 21 of the shaft portion 20 that constitutes the inner surface of the longitudinal hole 22. In the present embodiment, the shaft portion 20 has, as an example, two groove portions 223 and two transverse holes 24 that are symmetrically located with respect to the center line CL extending in the first direction Z of the longitudinal hole 22.

[0014] Each groove portion 223 extends along the first direction Z and is recessed in a second direction (for example, the X direction) that intersects the first direction and away from the center line CL. As an example, each groove portion 223 has a cross-section that intersects a substantially uniform center line CL from one end to the other end in the first direction Z. In the present embodiment, only one of the two groove portions 223 is provided with one horizontal hole 24.

[0015] The portion of the bottom portion 224 of each groove portion 223 in the peripheral wall portion 21 of the shaft portion 20 is defined as a thin wall portion 211, and the portion other than the thin wall portion 211 in the peripheral wall portion 21 of the shaft portion 20 is defined as a thick wall portion 212. In the present embodiment, the ratio (for example, W3 / W4) of the thickness of the thin wall portion 211 to the thickness of the thick wall portion 212 is preferably greater than zero and less than 1. That is, the thin wall portion 211 and the thick wall portion 212 are alternately positioned in the circumferential direction with respect to the center line CL. The thicknesses of the thin wall portion 211 and the thick wall portion 212 are dimensions of the peripheral wall portion 21 in a direction intersecting the first direction Z (in the present embodiment, the radial direction with respect to the center line CL).

[0016] The horizontal hole 24 extends through the peripheral wall portion 21 of the shaft portion 20 in the second direction and connects the longitudinal hole 22 and the outside of the shaft portion 20. The horizontal hole 24 has, for example, a substantially circular shape and is provided at an arbitrary position of the bottom portion 224 of the groove portion 223. The horizontal hole 24 is formed in the shaft portion 20 by, for example, press working. The shape of the horizontal hole 24 is not limited to a substantially circular shape and may be any other arbitrary shape.

[0017] Let the circumferential dimension of the bottom portion 224 of the groove portion 223 with respect to the center line CL when viewed along the first direction Z be W1, and the circumferential dimension of the horizontal hole 24 with respect to the center line CL be W2. In the present embodiment, the ratio (=W1 / W2) of the horizontal hole 24 to the bottom portion 224 of the groove portion 223 when viewed along the first direction Z is greater than zero and less than or equal to 1.

[0018] As shown in FIG. 1, the shaft portion 20 has a male screw portion 25 located at the other end in the first direction Z. The male screw portion 25 is provided on the outer surface around the center line CL of the shaft portion 20.

[0019] The banjo bolt 1 can exhibit the following effects.

[0020] The banjo bolt 1 includes a head 10 and a shaft portion 20 having a longitudinal hole 22 extending along a first direction Z. The head 10 is connected to one end portion of the shaft portion 20 in the first direction Z. An opening 222 connected to the longitudinal hole 22 is provided at the other end portion of the shaft portion 20 in the first direction Z. The shaft portion 20 has at least one groove portion 223 and a transverse hole 24. The at least one groove portion 223 is provided on the inner surface of the longitudinal hole 22, extends along the first direction Z, and is recessed in a second direction intersecting the first direction Z and away from a center line CL extending in the first direction Z of the longitudinal hole 22. The transverse hole 24 is provided at the bottom 224 of the groove portion 223, extends in the second direction, and connects the outside of the longitudinal hole 22 and the shaft portion 20. With such a configuration, only the portion of the thickness of the peripheral wall portion 21 of the shaft portion 20 where the transverse hole 24 is formed becomes thin, so that it is possible to realize the banjo bolt 1 capable of forming a small-diameter transverse hole by press working while suppressing a decrease in the tightening axial force (in other words, surface pressure).

[0021] Generally, when forming the transverse hole 24 by press working, a piercing punch is used. For example, when forming the transverse hole 24 in the thick portion 212 of the peripheral wall portion 21, the processing load required for processing the transverse hole 24 increases more than when forming the transverse hole 24 in the thin portion 211. When the processing load exceeds the material strength of the piercing punch, the piercing punch is broken (= exceeds the processing limit), so that the following disadvantages may occur. Since the banjo bolt 1 can be formed by press working, the occurrence of such disadvantages can be avoided. · It is necessary to use a processing means (for example, drill processing) with a higher processing cost than press working, and the manufacturing cost of the banjo bolt increases. · For example, drill processing is more likely to generate burrs and chippings than press working, so the quality problem of foreign matter mixing increases.

[0022] The groove portion 223 has a cross section intersecting a substantially uniform center line CL from one end to the other end in the first direction Z. With such a configuration, it is possible to realize the banjo bolt 1 having a uniform tightening axial force.

[0023] If the portion constituting the bottom 224 of the groove portion 223 of the shaft portion 20 is a thin-walled portion 211 and the portion other than the thin-walled portion 211 of the shaft portion 20 is a thick-walled portion 212, the ratio of the thickness of the thin-walled portion 211 to the thickness of the thick-walled portion 212 is greater than zero and less than 1. With such a configuration, it is possible to more reliably realize the banjo bolt 1 capable of suppressing a decrease in the tightening axial force and forming a small-diameter lateral hole by press working.

[0024] The ratio of the lateral hole 24 to the bottom 224 of the groove portion 223 when viewed along the first direction Z is greater than zero and less than or equal to 1. With such a configuration, it is possible to more reliably realize the banjo bolt 1 capable of suppressing a decrease in the tightening axial force and forming a small-diameter lateral hole by press working.

[0025] The shaft portion 20 has a plurality of groove portions 223, and the plurality of groove portions 223 are symmetrically located with respect to the center line CL. With such a configuration, a plurality of lateral holes 24 can be formed in the shaft portion 20.

[0026] The banjo bolt 1 can also be configured as follows.

[0027] The shaft portion 20 only needs to have at least one groove portion 223. For example, as shown in FIG. 4, one groove portion 223 may be provided in the shaft portion 20. Further, as shown in FIG. 5, two groove portions 223 may be provided in the shaft portion 20. Although not shown, three or more groove portions 223 may be provided in the shaft portion 20.

[0028] The shaft portion 20 only needs to have at least one lateral hole 24. For example, as shown in FIG. 5, one lateral hole 24 may be provided in each of the plurality of groove portions 223. Although not shown, a plurality of lateral holes 24 may be provided in one groove portion 223.

[0029] The head 10 can adopt any shape and configuration. For example, the shape of the screw head 12 is not limited to a substantially hexagonal prism, and may be a hexalobular, 12-point, triple square, etc. As shown in FIG. 6, the head 10 may have a configuration in which the flange 14 is omitted.

[0030] As described above, various embodiments in the present disclosure have been described in detail with reference to the drawings. Finally, various aspects of the present disclosure will be described.

[0031] The banjo bolt according to the first aspect of the present disclosure is a head, a cylindrical shaft portion having a longitudinal hole extending along a first direction inside, and is provided with, the head is connected to one end of the shaft portion in the first direction, an opening connected to the longitudinal hole is provided at the other end of the shaft portion in the first direction, and the banjo bolt is the shaft portion is at least one groove portion provided on the inner surface of the longitudinal hole, extending along the first direction and recessed in a second direction intersecting the first direction and in a direction away from the center line extending in the first direction of the longitudinal hole, a transverse hole provided at the bottom of the groove portion, extending in the second direction and connecting the inside and outside of the longitudinal hole and the shaft portion, and has.

[0032] The banjo bolt according to the second aspect of the present disclosure is the groove portion has a cross section intersecting the substantially uniform center line from one end to the other end in the first direction.

[0033] The banjo bolt according to the third aspect of the present disclosure is the banjo bolt according to the first aspect or the second aspect, if a portion constituting the bottom of the groove portion of the shaft portion is a thin-walled portion and a portion other than the thin-walled portion of the shaft portion is a thick-walled portion, the ratio of the thickness of the thin-walled portion to the thickness of the thick-walled portion is greater than zero and less than one.

[0034] The banjo bolt 1 according to the fourth aspect of the present disclosure is the banjo bolt according to any one of the first to third aspects, when viewed along the first direction, the ratio of the transverse hole to the bottom of the groove is greater than zero and less than or equal to 1.

[0035] The banjo bolt 1 according to the fifth aspect of the present disclosure is the banjo bolt according to any one of the first to fourth aspects, the shaft portion has a plurality of the grooves, the plurality of the grooves are symmetrically located with respect to the center line.

[0036] By appropriately combining any of the various embodiments or modifications, the respective effects can be achieved. Also, combinations of embodiments, combinations of examples, or combinations of embodiments and examples are possible, and combinations of features from different embodiments or examples are also possible.

[0037] The present disclosure is fully described in connection with preferred embodiments with reference to the accompanying drawings, but various variations and modifications will be apparent to those skilled in the art. Such variations and modifications should be understood to be included therein as long as they do not depart from the scope of the present disclosure as defined by the appended claims.

Explanation of Reference Numerals

[0038] 1 Banjo bolt 10 Head 12 Screw head 14 Flange 20 Shaft portion 21 Peripheral wall portion 211 Thin-walled portion 212 Thick-walled portion 22 Longitudinal hole 222 Opening 223 Groove 224 Bottom 24 Transverse hole 25 Male thread portion

Claims

1. a head, and a cylindrical shaft portion having a longitudinal hole extending along a first direction therein, wherein the head is connected to one end of the shaft portion in the first direction, and an opening connected to the longitudinal hole is provided at the other end of the shaft portion in the first direction, and the banjo bolt is wherein the shaft portion has at least one groove portion provided on an inner surface of the longitudinal hole, extending along the first direction, recessing in a second direction intersecting the first direction and away from a center line extending in the first direction of the longitudinal hole; and a transverse hole provided at a bottom portion of the groove portion, extending in the second direction and connecting the inside of the longitudinal hole and the outside of the shaft portion, a banjo bolt.

2. The banjo bolt according to claim 1, wherein the groove portion has a cross section intersecting the substantially uniform center line from one end to the other end in the first direction.

3. If a portion constituting the bottom of the groove portion of the shaft portion is a thin-walled portion and a portion other than the thin-walled portion of the shaft portion is a thick-walled portion, the ratio of the thickness of the thin-walled portion to the thickness of the thick-walled portion is greater than zero and less than one, and the banjo bolt according to claim 1 or 2.

4. The banjo bolt according to claim 1 or 2, wherein a ratio of the transverse hole to the bottom of the groove portion when viewed along the first direction is greater than zero and less than or equal to one.

5. the shaft portion has a plurality of the groove portions, and the plurality of the groove portions are symmetrically located with respect to the center line, and the banjo bolt according to claim 1 or 2.

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