Metal working – Means to assemble or disassemble – Means to interrelatedly feed plural work parts from plural...
Reexamination Certificate
1997-12-18
2001-05-01
Hughes, S. Thomas (Department: 3726)
Metal working
Means to assemble or disassemble
Means to interrelatedly feed plural work parts from plural...
C029S215000
Reexamination Certificate
active
06223426
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a device for introducing valve keys between a valve disc and a valve stem in internal-combustion-engine valves, including a guide body having a flange secured on a base body and projecting in the direction of the valve stem, a conveying channel assigned to the guide body and intended for feeding the valve keys into a fitting position, two feeders opening into the conveying channel for feeding the valve keys, and a centering piece assigned to the guide piece and engaging over the valve disc.
Such a device is disclosed in German Patent DE 32 47 589 C2. In that case, after the valve key has passed from the feeder into the conveying channel, it is retained by a lock assigned to the conveying channel. A pusher rod, which can be moved within the conveying channel, is placed against the locked valve key. When the pusher rod continues to move downwards, the valve key overcomes the lock and is moved into the fitting position with the aid of the pusher rod. The pusher rod remains in engagement until the valve disc is returned into its unstressed position and the projections of the valve key have penetrated into the valve-stem grooves.
The locking and movement mechanisms, together with the control devices which are necessary, result in a structure of the device which is complex and therefore susceptible to faults.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a device for introducing valve keys in internal-combustion-engine valves, which overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and which simplifies the introduction of the valve keys into an installation position.
With the foregoing and other objects in view there is provided, in accordance with the invention, in an internal-combustion-engine valve having a valve disc, a valve stem and valve keys, a device for introducing the valve keys between the valve disc and the valve stem, comprising a base body; a guide body projecting toward the valve stem and having a flange secured on the base body, a central axis and a recess symmetrical to the central axis, the recess defining wall regions; a pin passing longitudinally through the recess; a conveying channel associated with the guide body for feeding the valve keys into a fitting position; two feeders opening into the conveying channel for feeding the valve keys; a centering piece associated with the guide piece and engaging over the valve disc; and pivotally mounted guide beads having a basic position extended parallel to the pin and a region bent inwards toward the pin with a predeterminable radius; the conveying channel formed by the pin, the wall regions and the guide beads; and the bent region, the pin and the valve stem spaced apart by a distance to be set by changing the basic position of the guide beads.
The radius of the inwardly bent region and the distance are selected in such a manner that bulges of the fed-in valve key engage into annular grooves of the valve stem at the end of the conveying channel.
A simply constructed device is provided by virtue of the valve keys being brought into the fitting position automatically, without additional aids, such as pusher rods. The provision of the valve keys is also made simpler because no magazines having locking and release devices are required. Finally, the cycle times in the installation procedure are reduced due to the reduced control and actuating procedures.
In accordance with another feature of the invention, the pin is embedded in opposite grooves of the recesses, has an upper end side adjoining the feeders and has a lower end region with a base surface reaching as far as an end side of the valve stem.
In accordance with a further feature of the invention, in order to obtain a dimensionally accurate interior guidance of the valve keys, the pin has nose-shaped projections along its opposite longitudinal sides, and the nose-shaped projections are constructed in such a way that they are slightly smaller in cross-section than the smallest hollow extent of a valve key.
In accordance with an added feature of the invention, the guide bead has a side facing the feeder which is constructed as a flattened flange part through which a bearing bolt secured in the base body passes transversely with respect to the longitudinal extent of the guide bead, and a clearance fit is provided between the bearing bolt and its bearing bore, which is assigned to the guide bead, as well as between the guide bead and the recess wall. The clearance fits ensure that the pivotably attached guide beads rotate in a trouble-free manner.
In accordance with an additional feature of the invention, the base body and the flange part are each assigned a pretensioned compression spring in oppositely disposed blind bores, and adjusting screws which act towards the flattened flange part are provided in the flange. As a result, the distance between the pin, as well as the valve stem, and the inwardly bent region of the guide bead, can be set in an advantageous manner.
In accordance with yet another feature of the invention, in order to assist the penetration of the bulges of the valve key into the annular grooves of the valve stem, the guide bead has an intrinsic elasticity which acts in the radial direction.
The device can advantageously be used to install the valve disc, simultaneously with the fitting of the valve keys. Therefore, in accordance with a concomitant feature of the invention, the centering piece serves as a clamping piece for receiving and introducing the valve disc.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a device for introducing valve keys in internal-combustion-engine valves, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 3793999 (1974-02-01), Seiler et al.
patent: 4494306 (1985-01-01), Immonen
patent: 5072950 (1991-12-01), Littleproud et al.
patent: 5207196 (1993-05-01), Kuonen et al.
patent: 5226229 (1993-07-01), Pierce
patent: 5560099 (1996-10-01), Leistner et al.
patent: 32 47 589 C2 (1992-01-01), None
patent: 7245256 (1997-11-01), None
Kimmelmann Walter
Krump Christian
Themann Andreas
ABB Patent GmbH
Cozart Jermie E.
Hughes S. Thomas
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