JPS61142336A - Device for connecting movable operating rod to regulating member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides an adjustment member whose movement in one direction is limited by a stopper or the like, and an engagement member which can be tightened to an operating rod with a screw and which protrudes laterally. The engaging pieces are provided with a nut threaded portion for screws, the operating rod has a horizontal hole corresponding to the housing hole, and a cylindrical fixing pin is provided, which fixing pin is used during basic setting of the adjustment member. to prevent the operating rod from moving when it gets stuck in the housing hole and the operating rod lever.
The present invention relates to a device for connecting a movable operating rod to an adjusting member, in particular an adjusting rod of an injector of an internal combustion engine.

[Conventional technology]

For such adjustment members, it is important to make accurate basic settings. Therefore, when assembling, the adjustment member is pressed against a stopper, etc., and while there is no play between the operating rod and the adjustment member, the engaging piece is also tightened to maintain the state in which it is fixed at the stopper position relative to the operating rod. The engagement piece must be tightened onto the actuating rod in this position, since otherwise inaccuracies will occur again when the adjusting element is subsequently displaced. In a practically known construction, the engagement piece has a boss with a continuous longitudinal slit, by which it is supported on the operating rod. The screw tightens the vertical slit, thereby tightening the engagement piece onto the operating rod.

However, since the boss must necessarily have a certain amount of radial play on the operating rod, when the engaging piece is pressed against the adjustment member located at the stopper position, the axis of the boss is inclined to some extent with respect to the axis of the operating rod. I will do it. During subsequent tightening, as a result of the strain caused by this inclination, the operating rod springs back or moves back to some extent when it comes out of the stopper position, so that even though the engaging piece is tightened on the adjusting rod, the initially obtained During operation, these fine settings are not maintained, for example in internal combustion engines with several cylinders and an injector consisting of a pump and a nozzle associated with each cylinder, each injector having one adjustment rod. When the adjustment rod must be displaced in common and the operating rod has a plurality of engagement pieces for simultaneous displacement of a plurality of adjustment members,
The aforementioned drawbacks become particularly important.

In the first-mentioned device known from EP 55 245 A1, the actuating rod has a rectangular contour on which a rectangular engagement piece rests.

A screw is passed through a hole in the operating rod and a vertical hole in the engaging piece, and the engaging piece is tightened to the operating rod with a nut. Due to the play of the screw in the bore and the play between the engagement piece and the actuating rod, in this case too it is not possible to permanently tighten the engagement piece on the actuating rod due to the basic setting. Furthermore, the operating rod with a square outline is
Problems arise in its support within the housing.

This is because the support is difficult to manufacture.

[Problem that the invention seeks to solve]

The electrification system on which the present invention is based therefore eliminates this drawback and allows the relative position of the engaging piece obtained by the basic setting to be easily maintained with respect to the operating rod, making it possible to easily maintain the relative position of the engaging piece, which facilitates assembly. The object of the present invention is to provide a device of the first type mentioned for obtaining a structure.

[Means for solving problems]

In order to solve this problem, according to the present invention, the nut threaded portion in the engagement piece is configured as a nut threaded portion that is prevented from returning by the increased screwing torque, and the screw passes through the horizontal hole of the operating rod, so that the screwing direction is This corresponds to the direction of movement of the adjusting member towards the stop.

In the basic setting, when screwing the screw into the threaded part of the detent nut, torque is generated, causing the engagement piece to act independently on the adjustment part and material, and pressing this adjustment member against the stopper, so first set the stopper position of the adjustment member. It is sufficient to tighten the screw to obtain the desired value, so no previous operation is necessary. The engagement piece then reaches a suitable relative position with respect to the operating rod. When the screw is further screwed in, the engaging piece is tightened to the operating rod by the screw, so that the position of the engaging piece relative to the operating rod is fixed by increased frictional coupling. Due to the threaded part of the detent nut, the clamping screw connection will not come loose. This screwing process does not generate any initial stress, so after making the basic settings,
There is also no reaction force that would cause movement of the operating rod or change in the relative position of the engagement piece. It is only necessary to provide a suitable horizontal hole in the operating rod, and the engaging piece does not require a boss, but simply touches the operating rod, so the structure is very simple. Only a detent nut threading is required, which occurs when the detent nut threading differs from the threading of the thread or the thread itself in pitch, thread profile or cross-sectional shape of the hole.

A particularly simple and inexpensive construction is obtained if the engagement piece consists of a stamped metal shoulder part and the nut with a detent thread is attached to the engagement piece by welding, soldering or gluing.

This allows the use of commercially available and therefore inexpensive nuts. It is also possible to connect the nut to the sheet metal stamped part with rivets.

The device according to the invention is also suitable for connecting an operating rod to a regulator of an injection internal combustion engine. Other fields of application are also conceivable in which it is necessary to couple two movable elements for a common movement movement while maintaining the possibility of precise basic settings. Once the basic assembly has been carried out, the fixing pin that holds the operating rod in place can be replaced into the second housing hole, where it engages in the longitudinal slit of the operating rod and thereby During operation of the machine, the rotation of the operating rods due to the torque exerted on these operating rods by the engaging pieces projecting to one side from the operating rods is prevented. First of all, the fixing or guide pins, which serve only as assembly aids, are at the same time accommodated in the housing so that they cannot be lost and are always available again for the basic setting.

The pin is preferably screwed into the second housing hole, so that the head of the pin is threaded to prevent it from loosening or falling out during operation of the machine.

The adjusting element of the pump-nozzle arrangement must assume a stop position during basic assembly. However, in order to avoid damage and to keep the adjusting member a small distance away from the stopper during operation, the distance between the axis of the horizontal hole and the center of the roundness of the end of the nearby vertical slit is made larger than the distance between the axes of both housing holes. be able to.

〔Example〕

An embodiment of the invention is shown in the drawing.

An operating rod 2 is supported longitudinally movably in the housing l and serves to displace an adjusting rod 3 as an adjusting member of the injection pump 4 and to limit the movement of this adjusting rod 3 in one direction. Therefore, a stopper or the like (not shown) is provided. For basic setting of the adjustment rod 3, this adjustment rod must be pressed against a stopper or the like.

In order to connect the actuating rod 2 to the adjusting rod 3, an engaging piece 5 made of a sheet metal stamping is provided, to which a nut 6 with a detent thread is attached by welding or otherwise. The engagement piece 5 has a screw 7 passing through the horizontal hole 8 of the operating rod 2.
is tightened to the operating rod 2. The direction in which the screw 7 is screwed into the nut 6 is selected so that the adjustment rod 3 can be pressed independently against a stopper (not shown) or the like.

The operating rod 2, which is supported movably in the housing l against the force of a spring 4 in order to displace the adjustment rod (rack) 3 together, has a recess 9 in which the adjuster engages. Operation stick 2
An engagement piece 5 is tightened on top and is connected to the adjustment rod 3 by engagement therewith.

Two holes 10.11 are provided in the housing 1 at a distance from each other. The operating rod 2 has a horizontal hole 12 corresponding to the housing hole 10 and a terminal vertical slit 13 corresponding to the housing hole 11.

When making basic settings for the adjustment rod 3, as shown in FIG. held in position. After basic assembly, the pin 14 is replaced with the second housing hole 11 and the vertical slit 13, so that the operating rod 2 is prevented from rotating. Since the head of the fixing or guide pin 14 is provided with a male thread, it can be screwed into the housing hole 11 and fixed. Distance X between the axis of the horizontal hole 12 and the center of roundness of the nearby vertical slit end 13a
Since l is a little larger than the axial distance X between both housing holes 10 and 11, when the pin 14 is introduced into the housing hole 11 and the vertical slit 13, the handle 1112 is pushed slightly to the left, and at this time the adjustment rod 3 Move away from the stopper that determines the basic settings.

[Brief explanation of the drawing]

Figure 1 is a plan view of the operating rod and adjustment member of an injection pump for an internal combustion engine, Figure 2 is a sectional view taken along line ll-11 in Figure 1, and Figure 3 is an enlarged view taken along line III-=lII in Figure 1. cross section,
FIG. 4 is a plan view of the housing forming the support portion of the adjustment member, and FIG. 5 is a vertical sectional view taken along the line V--■ in FIG. 4. DESCRIPTION OF SYMBOLS 1... Housing, 2... Operation rod, 3... Adjustment member, 5... Engagement piece, 6... Nut, 7... Screw,
8.12... Side hole, lO... Housing hole, 14.
・Fixed bottle. FIG. 1

Claims (1)

[Claims] 1. An engaging piece that can be tightened to the operating rod with a screw and projects laterally is engaged with an adjusting member whose movement in one direction is restricted by a stopper or the like, A threaded part of the nut is provided, the operating rod has a lateral hole that corresponds to the housing hole, and a cylindrical fixing pin is provided, so that the fixing pin aligns with the housing hole and the lateral hole of the operating rod during basic setting of the adjustment member. , in which the operating rod is prevented from moving, the nut threaded portion (6) on the engagement piece (5) is configured as a nut threaded portion that prevents it from returning due to the increased screwing torque, and the screw (7) is configured to prevent the operating rod from moving. The adjustment member (3) passes through the horizontal hole (8) of (2) and the screwing direction is toward the stopper.
) A device for connecting a movable operating rod to an adjusting member, characterized in that it corresponds to the direction of movement of the control rod. 2. The patent claim, characterized in that the engagement piece consists of a sheet metal stamped part (5), and a nut (6) with a detent thread is attached to the engagement piece by welding, brazing or gluing. A device according to scope 1.