JPH05312120A - Screw fastener for fuel injection pump of internal combustion engine - Google Patents

Abstract

PURPOSE: To make a metallic protective member covering a nut impossible to be moved away without destroy by constituting the metallic protective member with two parts having particular configuration and securing a screw bolt with the nut at functional position. CONSTITUTION: A protective member 8 is made of metal and is divided into two parts. One part 37 has a hole through which screw bolt 10 penetrates, and is secured in the protective member 8 by nut 15. The other part 36 is formed in cup-shape and covers the screw hole 10 and nut 15. The engagement parts 35, 39 formed in two parts 37, 36 are movable until they reach the engagement position. The engagement part 39 of the part 37 is elastic, and can be closed by the other part 36 while it engages with the engagement part 35 of the other part 36. By this constitution, the fastener has a very simple structure and can respond to all the demand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw fastening device, in particular for a fuel injection pump of an internal combustion engine, of the type in which a nut secures a screw bolt in the working position.

[0002]

2. Description of the Related Art In a screw fastening device of this type, for example, when it is necessary to adjust a stopper and a lever of a fuel injection pump, the adjustment can be performed and fixed by a nut of the screw fastening device at the adjusted position. can do. Synthetic resin lids and colored marks are known in order to make this working position safe and above all to be able to verify any unauthorized intervention in the injection pump. However, this type of lid is no longer acceptable and the mark no longer corresponds to the demands imposed.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved lid and mark which meets the demands placed on it.

[0004]

The gist of the present invention, which has solved the above-mentioned problems, is a screw fastening device for a fuel injection pump of an internal combustion engine, which comprises a screw bolt and a member penetrated by the screw bolt. A protective member of a type provided with a nut which is screwed into a screw bolt and abuts against this member, and a cap-shaped protective member which can be fixed at a position where it is fitted over a screw fastening device including a screw bolt and a nut. Is made of metal and is divided into two parts, one part of which has a hole which is penetrated by a screw bolt and which is fixed to the member by the nut, and the other part of which is cap-shaped. Is formed on the screw bolt and the nut, and is movable to a position where the locking portions formed on both parts engage with each other. Engaging portion of the part is to be by connexion closed the other part when engaged with the engaging portion of the resiliently formed other have parts.

[0005]

The screw fastening device according to the invention is of simple construction and is able to meet the demands made in all respects.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment shown in FIGS. 1 and 2, a screw bolt 10 serving as a stopper is shown. The screw bolt 10 is adjustable between a maximum working position 12 (dashed line) and a minimum working position 13 in a casing 11 of a fuel injection pump (not shown). Screw bolt 1
Each adjusted position of 0 is retained by the nut 15 and secured by the ring 34. Protective member 8
Consists of a sheet of metal and consists of two parts, a perforated disc 37 with a spring tongue 39 and a cap 36 with an inwardly facing hook 35. An O-ring 24 is fitted between the cap 36 and the ring 34. The perforated disk 37 is fixed to the end surface of the casing 11 by the nut 15 via the washer 14. The inwardly facing spring tongue 39 of the perforated disc 37 projects into the recess 26, which is formed by both walls 27, 28 of the casing 11.

The protective member 8 is fixed to the screw fastening device as follows.

At the same time when the screw bolt 10 is fixed, the perforated disk 37 is fixed to the casing 11 by the nut 15. Next, the cap 36 moves in the direction indicated by the arrow 25,
The spring tongue 39 is inserted into the screw fastening device until it engages behind the hook 35. Finally, the cap 36 is an arrow 25.
The position is fixed by pulling it back to the illustrated position in the opposite direction.

In the second embodiment of the present invention shown in FIG. 3, the shaft 40 supported by a casing (not shown) has a threaded portion 51.
The nut 15 is screwed into the threaded portion 51. The protective member 9 made of a thin metal plate has two parts, that is, a cup-shaped portion 46 made of a thin metal plate and a protective sleeve 47. The protective sleeve 47 is attached to the washer 14 and the first nut 15 by the nut 15.
It is fixed to the shaft 40 via the lever 41 of the. The protective sleeve 42 is provided with a cylindrical collar 48, and a plurality of embossing protrusions 49 project inward from the inner wall thereof. The end surface of the cylindrical collar 48 has a conical extension 50.
Is provided. The cup-shaped portion 46 has a bottom portion 45 and a cylindrical wall 44, and the wall 44 is formed with an annular groove-shaped reduced-diameter embossed deformation portion 43. The end surface of the cup-shaped portion converges into a conical shape to form a tapered portion 52. When the cup-shaped portion 46 is inserted into the protective sleeve 47, the embossed protrusion 49 of the protective sleeve 47 engages with the reduced diameter embossed deformation portion 43 of the cup-shaped portion 46. At this time, the bottom portion 45 of the cup-shaped portion 46 projects into the sleeve-shaped portion of the collar 48 that follows, so that the cup-shaped portion 46 is prevented from being removed.

In both of the above-mentioned two embodiments, the metallic protection member covering the nut is fixed to the screw fastening device so that it cannot be removed without breaking it.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

2 is a cross-sectional view taken along the line VV of FIG.

FIG. 3 is a vertical sectional view of a second embodiment of the present invention.

[Explanation of symbols]

8, 9 Protective member, 10 Screw bolt, 11 Casing, 13 Working position, 14 Washer, 15
Nut, 27, 28 wall, 34 ring, 3
5 hooks, 36 caps, 37 perforated discs,
39 spring tongue, 40 shaft, 41 lever,
43 reduced diameter embossed deformation part, 44 wall, 45 bottom part, 46 cup-shaped body, 47 protective sleeve, 4
8 Cylindrical collar, 49 Embossed protrusion, 50
Expansion part, 51 screw part, 52 taper part

Front Page Continuation (72) Inventor Villy Miura, Germany Sulto Szygung Wiesenshuyutrase 38 (72) Inventor Manfred Scheuwalz, Federal Republic of Germany Gerlingen Hof Wiesenshuyutrace 4

Claims (5)

[Claims] 1. A screw fastening device for a fuel injection pump of an internal combustion engine, comprising a screw bolt, a member (11; 41) pierced by the screw bolt, and a screw fitted on the screw bolt. In a type having a nut that abuts and a cap-shaped protection member that can be fixed at a position where it is fitted over a screw fastening device composed of a screw bolt and a nut, the protection member is made of metal and has two parts. It is divided and one part (37; 47)
Has a hole which is penetrated by a screw bolt (10) and is fixed to the member by the nut (15), and the other portion (36; 46) is formed in a cap shape, The bolts (10) and nuts (15) are covered with locking parts (35, 35) formed on both parts.
39; 43, 49) are movable to a position where they engage with each other, and the engaging portion (39) of one part of the protective member is elastically formed and engages with the engaging part of the other part. A screw fastening device for a fuel injection pump of an internal combustion engine, characterized in that it is sometimes closed by this other part. 2. The locking part of the part (37) having a hole comprises an elastic tongue (39) which projects into a groove-shaped recess of the member (11), A hook (3) which is formed on the other part of the cap and faces the direction opposite to the inserting direction of this part and serves as a locking part.
5. The screw fastening device according to claim 1, wherein 5) is movable on the tongue in the inserting direction. 3. The portion (47) having a hole is formed in a cup shape and is provided with a peripheral wall (48) surrounding the screw bolt (51) and the nut (15) in an annular shape. A plurality of bumps (49) are formed inwardly in the cap, and the cap-shaped portion (46) is provided with an annular embossed deformation portion (43) on its elastic peripheral wall, and the cap-shaped portion (46) is formed. 2. A screw fastening device according to claim 1, wherein a) is insertable into the cup-shaped part (47) for engagement of its embossed deformation with the hump. 4. The peripheral wall (4) of the cup-shaped portion (47).
4. A screw fastening device according to claim 3, wherein 8) is provided with a conical extension (50) at its edge. 5. The edge of the peripheral wall of the cap-shaped portion (46) is provided with a conical taper portion (52).
The described screw fastening device.