JPS61164007A - Turning gear for poppet valve - Google Patents

Abstract

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

Description

TECHNICAL FIELD The present invention relates to a device for rotating a poppet valve of an internal combustion engine, which is biased by a coiled spring K, while the poppet valve is in motion. A spring is arranged between the spring presser and a support part which is rotatably arranged via the support body, and a rotational movement of the support part in one direction according to the freewheel principle relative to the substrate causes the following: In this way, the clamping is inhibited, i.e., by means of a rolling body as a body, a receiving part arranged concentrically around the axis of the base plate is provided in the form of an inclined surface, and the said spring increases the tension and the poppet When the valve opens, the load on the rolling elements is reduced and they become free.
On the other hand, the present invention relates to the above-mentioned device in which the rolling elements are fixed under load in order to rotate the base plate relative to the spring when the spring is relaxed and the poppet valve is closed.

Installation of devices of this kind, which are already known in various embodiments in the prior art, in particular in diesel engines operated on heavy oil, makes it possible to prevent the deposition of combustion residues on the valve seats, thereby preventing Wear is reduced and valve life can be extended.

In a known valve rotation device that generates rotational motion by torsion of a valve spring, a support part supporting the valve spring is rotatably supported on a base plate and receives an axial force, so that a freewheel is generated. A support ball is provided which prevents rotational movement in one direction.

A disadvantage of this known device is that it cannot operate satisfactorily over the entire rotational speed range. Moreover, uncontrolled manufacturing tolerances can have an effect on the freewheel, i.e. on its fixed position, leading to accelerated wear and eventual failure of the device.

OBJECTIVES It is an object of the present invention to provide, by simple means, an excellent device capable of correcting manufacturing errors and guaranteeing the accuracy of the relative position of each surface at a fixed position.

In order to achieve the above-mentioned object, the present invention provides that a substrate provided with a receiving part for receiving rolling elements as cylindrical rollers is annularly surrounded by the rotatable support part, and one rolling element is one rolling element.
be arranged between the inner wall of the support and the interface of the receptacle as a surface inclined with respect to said inner wall, and that at least the area of the interface for the rolling elements in the fixed position is swiveling. It is formed as a plate element which can be inserted, the plate element comprising:
It has a flat running surface tube for the rolling elements, while the supporting side opposite the running surface is curved in an arc for automatic positioning;
It is also characterized in that it has a suitable receiving surface for position adjustment parallel to the axis of the rolling element.

With such a simple configuration, the accuracy of the relative position of each surface with respect to the rolling element at the fixed position of the freewheel is improved, and the position of the rolling element can be fixed. In this case, manufacturing tolerances are compensated for by automatic and dynamic adjustment of the position of the support side of the plate element.One advantageous configuration is that an odd number of receptacles are arranged on the base plate. To ensure satisfactory operation even in the presence of vibrations and engine resonances, the rolling elements are biased in the clamping direction by springs, in particular by leaf springs.

Furthermore, an embodiment in which the plate element is designed as a hard metal platelet will now be described with reference to the attached drawings.

The poppet valve 1 of the internal combustion engine shown in the figure is slidably mounted by its valve stem 2 in a valve guide 4 received in a cylinder head 3. FIG. Valve stem 2f.

A coil spring 5 surrounds the cylinder head, and the coil spring 5 has one end supported by a spring retainer 6 and the other end supported by a support part 7. It is attached to a substrate 9 provided in 3. In order to realize the freewheel principle, the base plate 9 is surrounded in an annular manner by a rotatable support 7, on which a receiving part 10 for receiving a rolling element 11 as a cylindrical roller is arranged. Since the cylindrical roller 11 is attached to the inner wall 12 of the first support part
and the interface 13 of the receiving part 10 of the substrate 9.

The boundary surface 13 extends at an angle to the tangent between the cylindrical roller 11 and the inner wall 12, resulting in a surface inclined to the inner wall 12 of the support part 7, and the cylindrical roller 11 In one state, it is tightened between the inner wall 12 and the interface 13,
- In the universal state, the cylindrical roller lr becomes free. In the latter case, the cylindrical roller 11 is urged by the leaf spring 14 in the direction of tightening.

The region of the interface 13 in the receptacle 10 for fixing the position of the cylindrical rollers 11 is formed by a pivotably inserted plate element 15.The plate element 15 inserted in the groove 19 is It has a flat running surface 16, and the support side 17 opposite thereto is curved in an arc and has a receiving surface 18 on the base plate 9 for alignment parallel to the axis of the cylindrical roller 11. There is.

The operating mode is as follows.

The poppet valve 1 is moved axially with respect to its valve stem 2 to the valve opening position via a valve drive device (not shown in detail), during which the coil spring 5 is compressed and twisted in a thin winding direction. . Since the support portion 7 is disposed via the support ball 8, the support portion 7 rotates in the direction of the arrow 20 as the coil spring 5 twists. At this time, the cylindrical roller 11
is released from its clamping position and rolls to position 11'.

At this time, the poppet valve l rotates.

During the closing process of the poppet valve 1, the fill spring 5 relaxes and attempts to rotate back to its starting position.

Due to this direction of rotation, the cylindrical roller 11 is brought into its starting position between the inner part 11tz and the interface 13 of the receiving part 10, ie the clamping position, so that a return rotational movement is prevented and the poppet valve 1 is sealed in the off-position. The above-mentioned tightening position of the cylindrical roller 11 is only ensured accurately if the cylindrical roller 11 is supported in suspension on a tangent to the inner wall 12 and the boundary surface 13. A parallel position is obtained via the plate element 15. This is because the first supporting side 17 is curved in an arcuate manner and has a suitable receiving surface 18. Furthermore, since the plate element 15 can pivot, the cylindrical roller 11
The tightening position is always perfectly adjustable.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figure 1 is a longitudinal cross-sectional view of a device equipped with one valve in the cylinder head, Figure 2 is a cross-sectional view of a substrate equipped with a support part, and Figure 3 is a 1ll of Figure 2. 4 is an enlarged plan view of the plate element, and FIG. 5 is a side view of the plate element of FIG. 4.

Claims (4)

[Claims] (1) A device for rotating a poppet valve of an internal combustion engine, which is biased by a coiled spring, while the poppet valve is in motion, wherein the spring rotates via a spring presser and a support. The rotary movement of the support in one direction according to the freewheeling principle relative to the base plate is prevented in the following way, i.e. the rotation as a clamping body. A receiving part is provided in the formation of an inclined surface, which is arranged concentrically around the axis of the substrate via the moving body,
The rolling elements are unloaded and free when the spring increases tension and the poppet valve opens, while the base plate rotates relative to the spring when the spring relaxes and the poppet valve closes. , in the device in which the rolling element is fixed and restrained under load, a receiving part (1) for receiving the rolling element (11) as a cylindrical roller;
0) on which the substrate (9) is rotatable;
The rolling element (11) is surrounded by an annular shape between the inner wall (12) of the support part (7) and the interface (13) of the receiving part (10) as a surface inclined with respect to the inner wall (12). ), and at least the region of the interface surface (13) for the rolling element (11) in the fixed position is formed as a pivotably inserted plate element (15). , the plate element (15) provides a flat running surface (
16) and a supporting side (17) opposite the running surface.
is curved in an arc shape for automatic position adjustment, and has rolling elements (
11), characterized in that it has a suitable receiving surface (18) for position adjustment parallel to the axis of the device. 2. Device according to claim 1, characterized in that an odd number of receptacles (10) are arranged on the substrate (9). (3) According to claim 1 or 2, the rolling element (11) is biased in the tightening direction by a spring (14), in particular by a leaf spring. equipment. (4) Claims 1 to 3, characterized in that the plate element (15) is designed as a hard metal platelet.
Apparatus according to any one of clauses.