DE1810368A1 - Valve-turner for large I.C. engines - has roller body tracks formed in cold-embossed inserts for base body - Google Patents

Abstract

The apparatus is used for rotating hopper valves in large IC engines and uses a base body with pockets, containing roller bodies on tracks which are inclined in the peripheral direction. The pockets containing the tracks are fitted in cold-embossed insert pieces for the base bod. Preferably the insert pieces are fitted in a groove of the base body having a trapezoidal or rectangular cross section. The inserts are circular segments, and a filling piece can be inserted in the groove to equalize them. The inserts may have bores or embossed apertures for securing pins which engage in them. The base body may be more than 150 mm in diameter.

Description

Betr.s T 249 / A / rg - Applicant: Teves-Thompson & Co. GmbH

30I3 BARSINGHAUSEN P.O. Box 26

Device for rotating valves, preferably for internal combustion engines

The invention relates to a device for rotating valves, preferably for internal combustion engines, using a base body provided with pockets in which rolling elements are inclined in the circumferential direction roll off provided raceways.

Increases in performance can be achieved with internal combustion engines lead to valve difficulties. So z. B. uneven heating of the exhaust valves or over, moderate build-up of oil varnish and coke on the valve stems, which leads to the valves getting stuck in the valve guides cause serious damage to the valve train. Also valve failures due to seat leakage, caused by flaking off combustion residues,

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are to be observed. The damage mentioned can be reduced by a valve rotating device, the task of which is to initiate a rotary movement from the axial movement of the valve. Among other things, devices are known in which (FIGS. 1 and 2) steel balls 2 are arranged in circularly arranged raceways of a base body 1, the running surfaces having inclines on which the steel balls can roll under the action of a plate spring 5. The raceways 4 lie within pockets 3 of the base body. To use the valve rotators manufactured economically, is now generally dominated the Grund'körper with the balls 2 receiving not _T agile pockets and raceways therein cold. In this way, a high surface quality of the ball raceways 4 is achieved, in particular in the pockets 3. Because of the high resistance to deformation of the steels used to manufacture the valve rotating device, only smaller parts for engines in passenger cars or for trucks can be cold-stamped in one working stroke. In the case of larger parts, such as those used for small to medium-sized marine engines or stationary engines, the deformation resistance is already so great that hot deformation with subsequent cold deformation

must be carried out.

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In the course of development, the demand was made to manufacture ever larger parts, including the valves large and largest ship engines can be fitted with valve rotators. When trying to continue and tool considerations, however, arose found out that the usual way of manufacturing large body because of the limited size of the presses and the ever larger and more complex tools above 15o to 2oo mm in diameter no longer economical is "to this comes that it is because of the high hertz" see fretting between the ball and the ball track it is essential to have a compacted and solidified structure on the surface. The following The list shows the interrelationships of the development to date.

Motor type Largest dimension Number of d. Manufacturing process. of the base body travel pockets

Car engine 25th - 35 mm 5 ό 6th - 7th cold Truck engine 3o - 40 now ό - 9 cold Stationary
engine 35 - 50 mm Io - Io cold or
Warm cold small ships
motor up
average
Ship engine 5o - 12o mm - 12 Warm cold Large engine 15o - 400 mm - 3o _?

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- 4th

The object of the invention is to provide Ventxldrehvorrxchtungen to produce that are suitable for installation in a large engine and their manufacture also for diameter of the base body of more than 150 mm is economical, without having to forego the tried and tested compression of the structure by cold stamping.

The invention consists in that the pockets containing the raceways in cold-stamped insert pieces are arranged for the base body.

In a further embodiment according to the invention it is proposed that the insert pieces in a rectangular or trapezoidal cross-section provided groove of the base body to be arranged. Is particularly advantageous it to produce the inserts in the form of circular segments, with an in the groove of the base body insertable filler can be arranged. To secure the insert pieces Locking pins can be used to prevent them from falling out or the like intervene.

The valve rotating devices produced according to the invention can still be economical even with the largest dimensions

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- 5th

can be manufactured without having to forego the previous structural quality of the raceway surfaces got to. It is not necessary that the circumferential length of the segments is adhered to very precisely because the even distribution of the ball tracks around the circumference is not endangered with a large number of balls.

In the drawing is. an exemplary embodiment according to the invention shown and explained in more detail. Show here:

1 and 2 show an exemplary embodiment of a conventional type, which has already been mentioned above has been explained in more detail;

Fig. 3 shows an insert with a rectangular

Cross-section, inserted in a "

Base body;

4 shows two inserts placed next to one another in the shape of a segment of a circle with ano
ο embossed recesses for receiving

a locking pin;

Fig. 5 shows an insert with two, the

Bags containing ball tracks and a hole for the safety pin and

6 shows the arrangement of an insert with a trapezoidal cross-section, inserted into a base body,

In the base bodies Io is 11 in a circumferential groove £ rectangular cross-section, a segment-shaped insert piece 13 is used (Fig. 3). The steel ball is with 12 denotes »It is closed by a cover ring 14, which is arranged between the ball 12 and disk spring 15. The plate spring 15 is supported on the spring plate 16, which over the valve closing spring 17 upwards is pressed ^ Fig. 3). The circular segment-shaped inserts according to Figures 4 and 5 either carry one or two of the pockets containing the raceways A locking pin 19, which is inserted in recesses 2o in the insert piece, serves to secure against falling out can be shaped, intervene. It is also possible to provide bores 21 which can accommodate the locking pin 19. Avoiding special Securing elements, it is also possible to segment the shape Insert inserts in circumferential grooves that have a trapezoidal cross-section 22. (Fig. 6).

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Claims (1)

- 7 - Claims 1. Device for turning valves, preferably for Internal combustion engine !! using a base body provided with pockets in which rolling elements roll on running tracks provided with an incline in the circumferential direction, characterized in that the " pockets (18) containing the raceways in cold-stamped inserts (13) for the base body (Io) are arranged. 2 · Device according to claim 1, characterized in that dad the insert pieces (13) in one with a rectangular or a trapezoidal cross-section provided groove (11, 22) of the base body are arranged « 3 · Device according to claims 1 and 2, characterized in that the insert pieces (13) the Have the shape of segments of a circle. 4. Device according to claims 1 to 3, characterized in that to compensate for circularly arranged inserts (13) a groove (11, 22) the base body (Io) insertable filler piece is used. 009824/0924 1810366 5. Device according to claims 1 to 4 * thereby characterized in that the insert pieces (13) have bores (21), embossed recesses (2o) or the like for engaging locking pins (13). 6. Device according to claims 1 to 5 » characterized ^ characterized in that an insert piece (13) one or has several raceways arranged in pockets " 00982W0924