KR101594185B1 - Switchable cup tappet - Google Patents

Abstract

The present invention relates to a switchable cup tappet (1) for a valve drive of an engine, the cup tappet comprising an outer body (2) comprising an annular base (3) A hollow cylindrical protrusion 7 protrudes from the inner body 6 and an inner body 9 which is axially movable relative to the outer body 2 is guided in the bore 8 of the protrusion, 1 can come from the receiving portion 12 of one of the components 9 and 2 and can engage with the follower surfaces 13 of the other components 2 and 9 on a section basis to achieve a full valve stroke The coupling means 11 is extended and the anti-rotation member 20 provided between the parts 2, 9 is placed in the window-shaped opening 21 of the projection 7, (Coupled) to the complementary flute / longitudinal flat portion 24 (inside) of the outer jacket 16 of the body 9, 20 are formed by tool access through additional openings 22 in the area of the radially opposed skirt 5 which are in line with it.

Cup tappet, inner body, outer body, hollow cylindrical projection, coupling means

Description

Switchable cup tappet {SWITCHABLE CUP TAPPET}

The present invention relates to a switchable cup tappet for valve drive of an engine, said cup tappet having an outer body including an annular base formed for large stroke cam contact, A hollow cylindrical projection protrudes from the inner rim of the base and is guided in the bore of the projection relative to the outer body in an axially movable manner and the bottom of the inner body is supported by a support Wherein the cup tappet is provided with a coupling that can selectively engage with a follower surface of each of the other components from the receiving portion of one of the components to achieve a full valve stroke during cam- Means is extended, an annular surface is connected between the parts, and the outer surface of the inner body An annular member is fixed to the lower region of the jacket, one end of the lost motion spring is supported on the annular member, the other end of the lost motion spring at least indirectly acting against the base bottom of the outer body, Is placed in the opening of the projection and its inner surface is brought into contact with (engaged with) the complementary flute / longitudinal flat portion (inner) of the outer jacket of the inner body.

Cup tappets of this type are well known in the art and need not be described here in detail. A so-called "inner" anti-rotation member is provided between the outer body and the inner body of the cup tappet. This anti-rotation member mainly serves to hold the receiving portion of one of the parts in a straight line on the follower surfaces of the other parts by using at least one coupling means when coupling is required, It becomes. In some cases, the above-described anti-rotation member is effective also in a so-called piston-in-ring groove coupling. As a rotation preventing member, in the prior art, for example, a separate needle, a ball, or the like, which is placed in the opening of the protrusion of the outer body and whose inner surface engages in the vertical groove of the outer jacket of the inner body is used.

In this case, it is a problem that the opening can be formed in the protrusion of the outer body at low cost. Since the bore diameter of the protrusion is too small, it is extremely difficult to make the opening by approaching the tool in the bore of the protrusion. It is also problematic to provide the rotation preventing member in the opening of the projection. This is particularly advantageous when the flutes provided in the outer jacket of the inner body are located on the inner side of the inner body far from the base in order to reliably secure the annular part for supporting one end of the lost motion spring to the non- This is the case if it already ends before the end. In this case, simply inserting the inner body through the inner rim of the outer body base simply by inserting the inner body may be difficult because the inner body may collide with the radially protruding anti-rotation member.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cup tappet of the above type in which the aforementioned disadvantages are solved.

The object is achieved in accordance with the invention by means of a method according to the invention in which the opening of the hollow cylindrical projection is provided in the form of a window and the tool is approached through a further opening in the area of the radially opposed skirt, By forming the opening of the projection.

Thereby, a switchable cup tappet is provided in which the disadvantages mentioned in the introduction are solved. The present invention proposes a cup tappet having an outer body provided with an opening in the projection simply by means of, for example, perforation or boring through another opening (in line with the opening) in the skirt. This eliminates the need for complex tool access from the inside to the radial direction.

At least, though not necessarily, the longitudinal groove / longitudinal flat portion of the inner body has a longitudinal extension that does not continue in a direction away from the base, so that an annular member for supporting one end of the lost motion spring in the end region It is proposed to form an assembling opening just above the axial direction of the fixed portion of the annular member. Through this assembly opening, the anti-rotation member body is inserted into the opening in the projection positioned on the straight line when the differential stroke of the outer body with respect to the inner body is maximum in the assembling process. The differential stroke performed during assembly exceeds the differential stroke that the outer body performs relative to the inner body during operation of the cup tappet (shutdown mode).

Alternatively, in the case of the anti-rotation member which could be formed "continuously to the end" of the flute / longitudinal flat portion, and consequently assembled into the opening of the projecting portion, the inner body can be assembled from the top by inserting. In this case, an undesirable effect such as warping of the end side region of the internal body no longer occurs.

Optionally, the measures according to the invention may also be used for other switchable cam followers or switchable support members such as roller tappets or mushroom tappets.

According to a preferred refinement of the present invention, the rotation preventing member abuts on the upper end surface of the vertical groove / vertical flat portion during the cam-based circular circulation, so that the receiving portion in the one-side component is in line with the follower surface in the other- Can be deployed with clearance. Thereby, for example, it may not be necessary to provide a separate stop means, such as a snap ring, on the outer jacket of the inner body.

The switchable cup tappet can be formed as a so-called "stroke breaker ". To this end, the base of the outer body interacts with, for example, two adjacent large stroke cams. The base of the inner body may in this case include a start surface in contact with the so-called " zero stroke cam ". In some cases, a start face of a small stroke cam may also be provided for the inner body.

According to a particularly advantageous variant, one or both of the inner bodies are open in a tubular form. Generally, at least one of the components (outer body, inner body) is formed of a lightweight section steel such as a steel plate. Extrusion molding is considered in this respect.

Another subordinate term relates to the preferred formation of the anti-rotation member in the opening of the projection. The anti-rotation member may be formed, for example, as a needle, a roll, a ball, a pin, a spring clip, or the like. The guide of the anti-rotation member may be made through the side wall or the bottom of the flute when a flute formed in the outer jacket of the inner body is used. When the vertical flat portion formed in the outer jacket of the inner body is used, the radially inner end surface of the anti-rotation member interacts with the flat portion.

According to another preferred refinement of the invention, the anti-rotation member is "loosely" disposed within the opening of the projection. Thereby, no further fixing steps become necessary, and no deformation of the material occurs in the peripheral region of the opening. Alternatively, the anti-rotation member may be press-fitted into the opening, for example, and welded thereto. The radially outer fixation of the anti-rotation member may be via a ring extending to the outer surface of the protrusion.

Through the present invention, it is possible to provide a cup tappet having an external body which is simply formed through another opening aligned with the opening, the opening in the projection being provided in the skirt.

Figs. 1A and 1B show a switchable cup tappet 1. The cup tappet is formed of an outer body (2) having an annular base (3). The annular base is formed for the start of two large stroke cams. The thin wall skirt 5 is located away from the cam in the outer rim 4 of the base 3. The cup tappet 1 can be guided through the skirt 5 in the receiving portion of the internal combustion engine.

The hollow cylindrical projecting portion 7 projects from the inner edge 6 of the base 3 in the direction away from the cam. In the bore 8 of the projection 7, a tubular inner body 9 extends axially relative to the projection, and the inner body extends over its bottom surface 10, . It can also be seen in Fig. 1 that the inner body 9 can optionally be closed by the base 28. The base 28 can be used to start a small stroke cam or a zero stroke cam. However, when the inner body 9 has a tubular open shape, it does not hit any cam on the inner body. Therefore, the cup tappet 1 exists as a so-called "administrative breaker".

The cross bar of the inner body 9 has a receiving portion 12 here formed as a radial bore which comprises two coupling means 11 lying opposite to each other. The coupling means 11 is formed as a flattened piston starting from its outer end face and having its upper face sectioned by section. The coupling means 11 are provided in the bore 8 of the projection 7 and oppose the follower surface 13 formed, for example, in the form of a pocket, when the cam is circulated.

1B shows the coupling state of the cup tappet 1 in which a stroke of a large stroke cam packet pushing the base 3 of the outer body 2 is connected to a gas exchange valve .

It will also be appreciated by those skilled in the art that the thin wall annular member 17 is fixed to the lower region 15 of the outer jacket 16 of the inner body 9 from Figures 1A and 1B. The annular member serves to support one end of the lost motion spring surrounding the inner body 9 and the other end of the lost motion spring indirectly acts on the bottom surface 19 of the base 3. [

In the outer jacket 16 of the inner body 9, a flute / vertical flat portion 24 is provided. 1A, the flute / longitudinal flat portion 24 is fixed to the inner body 9 without ending at the end face 26 of the inner body 9, Lt; / RTI > The anti-rotation member 20 is engaged in the annular groove / vertical flat portion 24. The anti-rotation member is mounted in the opening 21 of the projection 7. The anti-rotation member 20 may be "loosely" The outer end surface 42 of the anti-rotation member extends to the outer surface 40 of the protrusion 7 and forms an annular shape extending from the bottom surface 19 of the base 3 to the inner jacket of the skirt 5, And strikes the member 41.

The opening 22 in the skirt 5 is linearly opposed to the opening 21 in the above-mentioned protrusion 7 radially outwardly. Thereby, the possibility of simply forming the opening 21 is provided. The opening 21 is formed in such a manner as to approach the tool through the opening 22. It is preferable to use a perforation or boring tool which forms the openings 22, 21 in almost one operation, in which case, of course, a plurality of work steps can also be considered.

The assembling of the anti-rotation member 20 can be performed differently according to the formation of the flute / vertical flat portion 24. [ If the annular member is fixed in a protruding manner over the entire peripheral surface by the vertical groove / vertical flat portion 24 ending before the annular member 17 in the axial direction, the flute / vertical flat portion 24, (25). This assembly opening is deeper in the axial direction than the deepest engagement point of the anti-rotation member in the vertical groove / vertical flat portion 24 when the differential stroke is being executed. The outer body 2 is displaced axially downward relative to the inner body 9 until the assembly opening 25 is aligned with the opening 21 in the projection 7. [ The anti-rotation member 20 can then move from the inside through the assembly opening 25 into the opening 21 in the projection 7.

In the case where the vertical groove / vertical flat portion 24 is formed so as to extend continuously to the end, that is, to extend from the base to the end face 26 of the inner body 9 (see FIG. 10), the inner body 9 is protruded The rotation preventing member 20 is inserted into the opening 21 in the projection 7 before it is installed in the bore 8 of the projection 7.

2 shows that the anti-rotation member 20 can hit the upper end face 27 of the flute / vertical flat portion 24 during cam-based circular circulation. Whereby the receiving portion 12 including the coupling means 11 in the inner body 9 can be arranged in a straight line with respect to the follower surfaces 13 in the projection 7. [

2 to 7 show various configurations of the anti-rotation member.

The anti-rotation member may be formed as a needle / roll 30 vertically " erected " in the opening 21 of the projection 7 according to Fig. 2, and the inner surface 23 of the needle / In the vertical groove 24 of the first and second guide grooves.

According to Fig. 3, a needle / roll 30 is provided which is "laid down"

According to Fig. 4, a "sideways" solid roll 34 is arranged, the inner end surface of which has a radially extending engaging collar 36. Fig. The axially inner surface of the engagement collar is adjacent to or ahead of the bore 8 of the projection 7. At this time, the roll 34 projects into the opening 43 of the annular member 41.

A solution similar to Fig. 4 is shown in Fig. However, the rolls 37 are hollow and have slots in the longitudinal direction.

According to Fig. 6, the anti-rotation member 20 may also be formed as a ball 31, which is radially inwardly engaged in the vertical groove 24 of the projection 7 to prevent twisting.

7, the anti-rotation member 20 is formed of a pin 32 having a convex internal engaging end face 33. As shown in Fig.

8 and 9 show that the vertical flat portion 24 (FIG. 8) may be provided or the vertical groove 24 (FIG. 9) may be provided, depending on the configuration of the anti- When the flutes 24 are used, guidance can be performed at the bottom of the groove or at the left and right sides.

≪

1) Cup tappet

2) outer body

3) Base of outer body

4) Outer border

5) Skirt

6) Inside border

7)

8)

9) Inner body

10) Bottom surface

11) Coupling means

12)

However,

14) Annular face

15) Lower region

16) outer jacket

17)

18) Lost motion spring

19) Base bottom

20)

21) An opening in the projection

22) The opening in the skirt

23) inner surface

24) Vertical groove /

25) Assembly opening

26) an inner body end face remote from the base

27) End face of the vertical groove

28) Base of the inner body

29) Needle / Roll

30) Needle / Roll

31) Ball

32)

33) Inner engaging end face

34) roll

35) Inner end face

36) Engagement collar

37) Roll

38) Inner end face

39) Engagement collar

40) outer end face

41)

42) outer end face

43)

1A is a longitudinal section of a cup tappet;

FIG. 1B is a view showing a state in which the cup tappet is rotated by 90.degree.

Figs. 2 to 7 are detailed views of modifications of the anti-rotation member provided in the projection. Fig.

8 is a partial cross-sectional view of the cup tappet at the height of the anti-rotation member having a flat portion in the protrusion.

Fig. 9 is a partial cross-sectional view of the cup tappet, as in Fig. 8, but with a flute formed in the protrusion;

10 is a partial cross-sectional view of the cup tappet according to FIG.

Claims (10)

A changeable cup tappet (1) for a valve drive of an engine, the cup tappet having an outer body (2) comprising an annular base (3) formed for large stroke cam contact, the outer edge The hollow cylinder type skirt 5 is located away from the outer body 2 and the hollow cylinder type protrusion 7 protrudes from the inner edge 6 of the base 3 and the outer body 2 is located within the bore 8 of the protrusion. And the bottom surface 10 of the inner body serves as a supporting surface of the gas exchange valve. In the cup tappet 1, (12) of one of the parts (9, 2) to be able to engage with the follower surfaces (13) of the different parts (2, 9) A means (11) is extended, between which the annular surface (14) An annular member 17 is fixed to the lower region 15 of the outer jacket 16 of the inner body 9 and one end of the lost motion spring 18 is supported on the annular member, The other end of the lost motion spring acts at least indirectly against the bottom 19 of the base 3 of the outer body 2 and the anti-rotation member 20 provided between the parts 2, 7) and the inner surface 23 thereof is brought into contact with (combined with) (within) the complementary flute / longitudinal flat portion 24 (in) of the outer jacket 16 of the inner body 9, In the switchable cup tappet, The opening 21 of the hollow cylindrical projection 7 is provided in the form of a window and is provided with a tool through a further opening 22 in the region of the radially opposed skirt 5, Wherein an opening of said protrusion is formed by access. 2. The motorcycle according to claim 1, wherein the flute / vertical flat portion (24) of the inner body (9) is formed such that at least the rotation preventing member (20) Having a vertical extension ending in or before the annular member 17 provided in the outer jacket 16 of the inner body 9 and having a differential stroke, (25) that is deeper in the axial direction than the deepest engagement point of the anti-rotation member (20) in the vertical groove / vertical flat portion (24) at the time of decoupling When the differential stroke of the outer body 2 with respect to the inner body 9 at the time of assembling is at a maximum, the rotation preventing member 20 has an opening 21 in the projecting portion 7 which is in alignment with the assembling opening from the radially inner side to the outer side, Characterized in that the switch The cup tappet (1). 2. The internal combustion engine as set forth in claim 1, wherein the flute / vertical flat portion (24) of the internal body (9) starts from a position where at least the rotation preventing member (20) The protrusion 20 has a longitudinal extension extending through the entire axial extension of the protrusion 7 from the base to the inner body end surface 26 farther from the base, And then the inner body 9 is inserted into the bore 8 of the projection 7 through the inner rim 6 of the base 3 Features a switchable cup tappet (1). The rotation preventing member (20) according to claim 1, wherein the rotation preventing member (20) abuts against the upper end face (27) of the vertical groove / vertical flat portion (24) of the inner body (9) The receiving portion 12 including the coupling means 11 located in the other part 9 and 2 is in alignment with the follower surface 13 located in the respective other part 9, Is determined according to the position of the tappet (1). 2. The internal combustion engine according to claim 1, characterized in that the internal body (9) has a base (28) for starting a small stroke cam or a zero stroke cam, or a cam start face is not present in the internal body , Convertible cup tappet (1). 6. A changeable cup according to claim 5, characterized in that with respect to a variant in which the internal body does not have a camstart surface, the internal body (9) is open in a tubular form at least on the base side or both sides. Tappit (1). The switchable cup tappet (1) according to claim 1, characterized in that the openings (21, 22) in the projections (7) and the skirt (5), which are in line, are perforated or bored by means of a tool. The anti-rotation member (20) according to claim 1, wherein the anti-rotation member (20) provided in the opening (21) a) a cylindrically-shaped needle / roll (29, 30) of a vertically erected or laterally lying form, b) the ball 31, c) a pin 32 in the form of a sideways shape having a convex internal engagement end face 33, d) a solid roll 34 in the form of a sideways profile with an engaging collar 36 radially extending its inner end surface 35 and having an inner surface adjacent the bore 8 of the protrusion 7 Roll 34, or e) a roll lying in the form of a sideways roll with a hollow and longitudinal slot, the inner end surface 38 of which extends radially and whose inner surface is adjacent to the bore 8 of the protrusion 7 Characterized in that it is a roll (37) having an engaging collar (39). 9. A device according to any one of the preceding claims, characterized in that the window-shaped opening (21) formed in the projection (7) is complementary to the outer jacket of the anti-rotation member (20) 21 ", or may be mounted "loosely" or "snugly" An annular member (41) such as a thin plate ring is fixed to the outer surface (40) of the projection (7) and an outer end surface (42) of the anti- , Characterized in that the pockets (43) of the annular member (41) are attached section-by-section within the complementary opening (7).

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