JPH0643331U - Fixed plate - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fixing plate capable of surely fixing bolts or nuts and the like located close to each other to prevent loosening. [Structure] A fixing hole is provided at one end and a long hole is provided at the other end, and the fixing hole has a chrysanthemum shape having a large number of corners so as to form a regular n polygon (n is a positive integer). The angle formed by the plate center line connecting the center of the fixing hole portion and the center of the long hole portion and the straight line connecting the center of the corner portion and the fixing hole portion closest to the plate center line is 360 ° /
4n.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixing plate for preventing loosening of bolts or nuts, and more particularly to a fixing plate capable of preventing loosening of bolts or nuts located in close proximity.

[0002]

[Prior art]

 Conventionally, various fixing members have been developed in order to prevent loosened bolts from falling off. For example, as a fixed plate for preventing loosening of a delivery valve holder of a multi-cylinder fuel injection pump of a diesel engine, it has n corners in the same shape as a regular n polygon that is the outer shape of the delivery valve holder. Discloses a fixed plate that has a fixed hole part that has a corner that is an integer multiple of n by arbitrarily displacing a regular n-polygon at one end and has a long hole part at the other end (for example, in actual use). 55-44092).

Such a conventional fixing plate is press-fitted into a clamped delivery valve holder through a fixing hole, and is used by being locked to a housing of a fuel injection pump with a bolt inserted in the long hole. To be done. Further, two fixing plates engaged with the adjacent delivery valve holders may be overlapped with each other at the long hole portions and fixed between the fixing plates by a pair of bolts and nuts for use.

[0004]

[Problems to be solved by the device]

 However, when two adjacent delivery valve holders are fixed by two fixing plates and separate fixing bolts as described above, and two adjacent delivery valve holders are fixed by two fixing plates and a set of bolts. It is difficult to securely fix the delivery valve holder in a multi-cylinder fuel injection pump with a relatively short inter-cylinder pitch and a small space, regardless of whether it is fixed with a nut or a nut. There was a problem.

That is, in the former case, there is interference between the adjacent fixed plates, and in the latter case, there is interference between the fixed plate and the delivery valve holder, and there is a restriction such that the long hole cannot be widened. is there. Therefore, for example, when the delivery valve holder has a regular hexagonal outer shape, by setting the number of corners of the fixing hole to a large number such as 12, 18 or 24, the delivery valve holder after the final tightening is rotated again. It is possible to fix with a fixing plate without making it.

However, as the number of corners of the fixing hole increases, the degree of engagement between the outer corner of the delivery valve holder and the fixing hole of the fixing plate decreases, and the original purpose of fixing the delivery valve holder is fixed. Will not be performed reliably.

The present invention has been made in view of the above circumstances, and provides a fixing plate capable of reliably fixing a bolt, a nut, or the like located in close proximity to prevent loosening. The purpose is to

[0008]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a fixed hole portion at one end and a long hole portion at the other end, and the fixed hole portion is formed as a regular n polygon (n is a positive integer). Is formed in a chrysanthemum shape having a large number of corners so that the center line of the plate connecting the center of the fixed hole and the center of the long hole, and the corner part and the corner part closest to the center line of the plate. An angle formed by a straight line connecting the centers of the fixing holes is set to 360 ° / 4n.

[0009]

[Action]

 The angle between the n corners of the chrysanthemum-shaped fixed hole is 360 ° / n, and connects the plate center line to the center of the corner closest to the plate center line and the center of the fixed hole. Since the angle formed by the straight line is 90 ° / n, by flipping one fixed plate upside down, the phase of the chrysanthemum-shaped corners becomes opposite through the center line of the plate, and substantially the chrysanthemum-shaped corners Another fixed plate is constructed whose phases differ by 360 ° / 2n.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing an example of a fixing plate of the present invention. In FIG. 1, the fixed plate 1 includes a fixed hole portion 2 and a long hole portion 6.

The fixing hole portion 2 is provided at one end of the fixing plate 1, and the periphery thereof forms a chrysanthemum shape having a large number of corner portions 4 so as to form a regular n polygon (n is a positive integer). ing . In the illustrated example, n = 12, and the angle (angle between corners) θ ₁ formed by the line connecting the center (plate center) 3 of the fixing hole 2 and each corner 4 is 360 ° / n (n = 12 In this case, θ ₁ = 30 °).

Here, the value of n is not limited to 12, and when the fixed object has a hexagonal bolt shape, n is an integral multiple of 6, 12, 18, 24 ... Can be However, as will be described later, in the fixing plate of the present invention, the value of n can be set small, and the degree of engagement with the fixed object can be increased.

The long hole 6 is an oval hole provided on an arc line centered on the plate center 3 described above, and both ends thereof have a semicircular shape. The straight line connecting the center 7 of the long hole 6 and the plate center 3 is the plate center line L, and the centers 7a and 7b of the semicircles at both ends of the long hole 6 are lined through the plate center line L. It is in a symmetrical position.

In the fixed plate 1, the plate center line L and the straight line 1 connecting the plate center 3 and the corner portion (corner portion 4a in the illustrated example) closest to the plate center line L are formed. The angle α is set to be ¼ of the inter-corner angle θ ₁ = 360 ° / n, that is, 360 ° / 4n (7.5 ° in the case of n = 12). Further, the long hole angle θ ₂ formed by the centers 7a and 7b of the semicircles at both ends of the long hole portion 6 with the plate center 3 may be set so as to satisfy θ ₂ ≧ θ _1/2 , and n = In the case of 12, the oblong hole angle θ ₂ may be 15 ° or more.

FIG. 2 is a plan view showing a state in which the fixing plate 1 shown in FIG. 1 is turned upside down. In FIG. 2, the chrysanthemum shape of the fixing hole portion 2 ′ of the fixing plate 1 ′ which is turned upside down and the chrysanthemum shape of the fixing hole portion 2 of the fixing plate 1 shown in FIG. There is a line-symmetrical relationship. Focusing on the corner portion 4a of the fixing plate 1 shown in FIG. 1 and the corner portion 4a 'of the fixing plate 1'shown in FIG. 2, the chrysanthemum shape of the fixing hole portion 2'of the fixing plate 1'is the plate center. This is the same as the case where the chrysanthemum shape of the fixing hole portion 2 of the fixing plate 1 is shifted about 360 ° by 360 ° / 2n.

Therefore, by actually turning over the fixing plate 1, another fixing plate having a fixing hole portion having a chrysanthemum shape having a phase difference of 360 ° / 2n from that of the fixing hole portion 2 is prepared. Will be the same. Therefore, as shown by the phantom line in FIG. 2, when the fixing plate 1 is turned upside down, the oblong hole angle θ ₂ is doubled, and θ ₁ = 360 ° / n or more.

Here, an example of a conventional fixing plate is shown in FIG. 3 for reference.

In FIG. 3, the conventional fixing plate 11 includes a fixing hole portion 12 and a long hole portion 16. The fixing hole 12 has a chrysanthemum shape having a large number of corners 14 such that the peripheral edge thereof is a regular n polygon (n is a positive integer), like the fixing hole 2 of the fixing plate 1 described above. I am configuring. The value of n is 12 as in FIG. 1, and the angle θ ₁₁ between the corners formed by the line connecting the center (plate center) 13 of the fixing hole 12 and each corner 14 is 360 ° / n (n = 12). In this case, θ ₁₁ = θ ₁ = 30 °).

The long hole 16 is an oval hole provided on an arc line centered on the plate center 13. In order to fix hexagonal bolts or delivery valve holders using the fixing plate 11 regardless of the final tightening position, the center of the semi-circular shape at both ends of the slot 16 is fixed. It is necessary to set the oblong hole angle θ ₁₂ formed by the plates 17a and 17b with the plate center 13 so as to satisfy θ ₁₂ ≧ θ ₁₁ = 360 ° / n = 30 °.

On the other hand, as shown in FIG. 2, in the fixing plate 1 of the present invention, the oblong hole angle θ ₂ can be doubled by changing the front and back sides. At (n = 12), the oblong hole angle θ ₂ can be set to 1/2 of the oblong hole angle θ ₁₂ of the conventional fixing plate 11. Therefore, the mounting flexibility of the fixing plate of the present invention is significantly improved as compared with the conventional fixing plate. For example, in a multi-cylinder fuel injection pump with a relatively short inter-cylinder pitch and a small space, a delivery valve holder is provided. It is possible to securely fix the da.

Further, when the fixing plate of the present invention is mounted instead of the conventional fixing plate 11, the oblong hole angle θ ₂ can be doubled by changing the front and back as described above. The number of chrysanthemum-shaped corner portions 4 of the hole portion 2 can be reduced to half at maximum. That is, when the chrysanthemum shape of the fixing hole 12 of the conventional fixing plate 11 is a dodecagon, the fixing plate of the present invention can change the front and back sides by changing the front and back even if the fixing hole 2 has a hexagonal shape. Hexagonal bolts or delivery valve holders can be fixed regardless of the final tightening position.

As a result, the holding area with the delivery valve holder or the like, which is the object to be fixed, increases, and the fixing ability for preventing loosening is greatly improved.

The fixed object that can be fixed using the fixing plate of the present invention as described above includes an external hexagonal bolt, a delivery valve holder for a multi-cylinder fuel injection pump of a diesel engine, and an external hexagonal shape. There is no particular limitation on the nuts, etc., and the dimensions of the fixing holes, the number of chrysanthemum-shaped corners, the dimensions of the long holes, etc. can be appropriately determined according to the symmetrical outer shape of the fixed object.

FIG. 4 is a plan view showing the fixing plate of the present invention mounted on the delivery valve holder of the two-cylinder fuel injection pump.

In FIG. 4, the delivery valve holders 21, 21 adjacent to the two-cylinder fuel injection pump 20 are provided with the fixed plate 1 of the present invention and the fixed plate 1 ′ which is the inverted version of the fixed plate 1. ing. Then, the two fixing plates 1 and 1 ′ are overlapped with each other by the long hole portions 6 and 6 ′ and are fixed to the pump housing by the bolt 30.

[0027]

[Effect of device]

 As described in detail above, according to the present invention, it is possible to provide a fixing plate that has a high degree of freedom in attachment to bolts or the like with a small space between them and a greatly improved fixing ability for preventing loosening.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a fixing plate of the present invention.

FIG. 2 is a plan view showing a state in which the fixing plate shown in FIG. 1 is turned upside down.

FIG. 3 is a plan view showing an example of a conventional fixing plate.

FIG. 4 is a plan view showing a fixing plate of the present invention mounted on a delivery valve holder of a two-cylinder fuel injection pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixed plate 2 ... Fixed hole part 3 ... Center of fixed hole part (center of plate) 4 ... Corner part 6 ... Long hole part 7 ... Center of long hole part L ... Plate center line

Claims (1)

[Scope of utility model registration request] 1. A fixing hole is provided at one end and a long hole is provided at the other end, and the fixing hole has a large number of corners so as to form a regular n polygon (n is a positive integer). A chrysanthemum-shaped plate center line connecting the center of the fixing hole portion and the center of the elongated hole portion, and a straight line connecting the corner portion closest to the plate center line and the center of the fixing hole portion The fixed plate is characterized in that the angle formed is 360 ° / 4n.