DE102005057298A1 - Lever-type cam tracker for valve drive has two transverse sectors in form of individual components with modular assembly to side walls - Google Patents

Abstract

The cam tracker (1) has two upright side walls (2) connected to each other at their ends by transverse sectors (6, 7). On the underside (8) of one transverse sector, at one end, there is a fitting (9) for a valve stem, and on the underside (10) of the other, there is a complementary surface (11) for the head of a support element. The transverse sectors are individual components assembled in modular fashion with the side walls.

Description

Territory of invention

The The invention relates to a lever-type cam follower of a valve train an internal combustion engine, with two upright sidewalls, the in the region of their ends by a respective transverse section with each other are connected, wherein at an underside of the transverse section one end of a facility for a valve stem and at an underside of the transverse section the other end a complementary area either for one Head of a support element or for one end of a pushrod is shown.

background the invention

such Cam follower, for example made of thin-walled sheet steel, are sufficiently known in the art and must not closer to this point explained become. These cam followers are, for example, in one more Steps comprehensive stamping bending process generated from a sheet metal strip. It is obvious that every type of internal combustion engine in the Usually a specially dimensioned cam follower required. Consequently have to with big Effort produced a variety of sample and mass production tools become.

In addition, will the cam follower according to the prior art usually complete a hardening process subjected. reinforced is also thought to apply applied layers. The latter activities However, they can only be limited locally, so only very accurately refer to the area where need prevails.

task the invention

task The invention is therefore a cam follower of the aforementioned To create a way in which the cited disadvantages are eliminated.

Solution of task

According to the invention this Task solved by that the two transverse sections as a single, largely thin-walled Components are present and with the two same, largely thin-walled Sidewalls, forming one in the longitudinal direction of the lever seen intervening recess, are modularly joined.

Consequently is a cam follower, in which the above-mentioned disadvantages are eliminated. As a cam follower, a towing, tilting or rocker arm in question. Possibly. can also be provided a cam follower be whose side walls and transverse sections are not necessarily considered to be thin-walled.

Conveniently, However, the cam follower should consist of thin-walled sheet steel. Its essential components are side walls and cross sections manufactured separately and preferably in one operation (also several Operations are conceivable) and in a device (also several devices are conceivable). This allows a big one variability at relatively low tooling and manufacturing costs. So can for different Internal combustion engines, for example, the same sized side walls be combined differently sized cross sections. Or it will be for different internal combustion engines equally sized cross sections paired with different sized side walls. Since the side walls at a Levers should preferably be identical, here are the costs for the tools kept within limits.

In Concretization of the invention is intended, a role as Cam counter surface in the region of a recess of the lever between the transverse sections to arrange. For However, all cam follower variants can also have a sliding surface as Cam counter surface be provided. In the case of the aforementioned role, this can on a Axis run, the front side outer areas tapered. The axis can in a device and in one operation with the remaining components (side walls, cross sections) mounted become. About the cone surfaces learns the axle an attachment in corresponding holes of the side walls. It is However, also provided to dispense with the cone surfaces of the axis and to caulk them, for example, in the side walls, to weld, etc.

Further under claims refer to appropriate connectivity the side walls. with the cross sections. So can the side walls have longitudinal slots immediately before the end faces (preferably not continuous, but possible), in which side pieces the cross sections strip-like run. The longitudinal slots can also cut the faces of the side walls, so that it is possible too is, the transverse sections during the assembly process along to the side walls move.

Also It is conceivable and intended, the transverse sections, starting from their mutually facing transverse stems, to provide with longitudinal slots, so that these are almost over the front sides of the side walls run stuck and possibly slightly beyond outer surfaces of the side walls protrude.

The cam follower can be in the area of the cross sections have either a U, an inverted U or H-like profile. In the inverted U or the H-profile, the inner surfaces of the side walls in the region of a transverse portion may be formed simultaneously as a valve stem guide. Thus, further measures can be dispensed with in this area.

According to one Variant of the invention, it is also provided in the bottom of a cross piece Valve stem guide tabs for example, impress or at least separately in this area.

alternative to the formation of the cam follower of thin-walled steel sheet whose individual parts also from fiber and / or particle-reinforced plastics or from by casting consist of manufactured items. Thus, it is obvious that also very good different materials can be combined.

One particular advantage of the invention is the fact that only those parts of a heat treatment be subjected or provided with a coated layer, where wear protection necessary is. So it is conceivable and intended, only at least one of the transverse sections with one of the aforementioned measures to provide.

The Cross sections can with the side walls for example, by a simple press or shrink connection get connected. It is conceivable and planned, however, this Components together by welding, soldering, gluing, caulking or like to connect.

short Description of the drawing

The Invention is suitably closer to the drawing explained. Show it:

1 in a three-dimensional view of the completely modular cam follower and the

2 the aforementioned cam follower in an exploded view and with built-in role as a cam contact surface.

Full Description of the drawing

Shown is a lever-like cam follower 1 a valve train of an internal combustion engine. This consists of the following explained, thin-walled sheet steel parts, which are joined like a module.

The cam follower 1 has two upright sidewalls 2 , In the area of an end 4 is a thin-walled cross section 6 intended. This one has at its bottom 8th a plant 9 for a shaft of a gas exchange valve. With his side pieces 15 runs the cross section 6 in sections in associated longitudinal slots 13 immediately in front of front sides 17 the side walls 2 ,

At the opposite end 5 of the cam follower 1 is another cross section 7 intended. This one has at its bottom 10 a complementary area 11 for storage on a head of a support element. With his side pieces 16 this cross section runs 7 again in sections in complementary longitudinal slots 14 in the area of front sides 18 the side walls 2 , The longitudinal slots 14 in turn do not cut the ends 18 ,

Between facing crossstones 19 . 20 the cross sections 6 . 7 is a recess 12 created. Possibly. However, it is also conceivable at this point to create a continuous crossbar, with the side walls 2 is added.

In the aforementioned recess 12 sticks out a role 23 as an immediate cam starting agent. The role 23 is about a rolling bearing 24 on an axis 22 stored outside (area 25 ) in holes 21 the side walls 2 runs.

The frontal areas 25 can be conically tapered. During the joining process, the axis can 22 For example, be joined in a device with the other cam follower parts (see below) and is on pressing outside in the holes 21 held.

The 2 discloses in exploded view the components side walls 2 , Cross sections 6 . 7 in their unfastened state. The axis 22 is only shown unassembled on one side. For a mounting, it is conceivable that the transverse sections 6 . 7 with intermediate axis 22 as well as role 23 held in the one device and the side walls 2 be pushed towards each other so that the side pieces 15 . 16 the cross sections 6 . 7 in the corresponding longitudinal slots 13 . 14 the side walls 2 run. At the same time pushing the holes 21 the side walls 2 over the cone-like areas 25 the axis 22 , Optionally, then additional fastening measures such as welding, caulking can be used for the cam follower components.

1

cam follower

2

Side wall

3

Not forgive

4

The End

5

The End

6

cross section

7

cross section

8th

bottom

9

investment

10

bottom

11

complementary surface

12

recess

 13

longitudinal slot

 14

longitudinal slot

15

counterpart

 16

counterpart

17

front

18

front

 19

cross forehead

20

cross forehead

21

drilling

22

axis

23

role

24

roller bearing

25

Area

26

palm

Claims (18)

Lever-like cam follower ( 1 ) of a valvetrain of an internal combustion engine, with two upright sidewalls ( 2 ) in the area of their ends ( 4 . 5 ) by a respective transverse section ( 6 . 7 ) are connected to each other, wherein at a bottom ( 8th ) of the transverse section ( 6 ) at one end ( 4 ) an annex ( 9 ) for a valve stem and at a bottom ( 10 ) of the transverse section ( 7 ) at the other end ( 5 ) a complementary surface ( 11 ) is shown either for a head of a supporting element or for an end of a push rod, characterized in that the two transverse sections ( 6 . 7 ) are present as individual, largely thin-walled components and with the two same, largely thin-walled side walls ( 2 ), forming a recess seen in the longitudinal direction of the longitudinal recess ( 12 ), are modularly joined. Cam follower according to claim 1, characterized in that in the region of the ends ( 4 . 5 ) in the side walls ( 2 ) Longitudinal slots ( 13 . 14 ) are applied, in which side pieces ( 15 . 16 ) of the transverse sections ( 6 . 7 ) run firmly. Cam follower according to claim 2, characterized in that the longitudinal slots ( 13 . 14 ) End faces ( 17 . 18 ) of the side walls ( 2 ) do not cut. Cam follower according to claim 2, characterized in that the longitudinal slots ( 13 . 14 ) End faces ( 17 . 18 ) of the side walls ( 2 ) to cut. Cam follower according to claim 1, characterized in that the transverse sections ( 6 . 7 ), starting from their mutually facing transverse stems ( 19 . 20 ), Longitudinal slots are immanent in which the front ends ( 4 . 5 ) of the side walls ( 2 ). Cam follower according to claim 1, characterized in that the cam follower ( 1 ) is designed as a drag lever, wherein the transverse section ( 7 ) on the other end ( 5 ) the complementary area ( 11 ) has for the support element, wherein the side walls ( 2 ) in the region of the recess ( 12 ) with a bore ( 21 ), in which in the joined state an axis ( 22 ) is mounted on the front side, on which a roll ( 23 ) either via a rolling or a plain bearing ( 24 ), which role ( 23 ) is designed as a cam contact surface. Cam follower according to claim 6, characterized in that the axis ( 22 ) at both ends into a conically tapered region ( 25 ) over which areas ( 25 ) in the holes ( 21 ) of the side walls ( 2 ) runs firmly. Cam follower according to claim 1, characterized in that the cam follower ( 1 ) in cross-section, in the region of the transverse sections ( 6 . 7 ) has either an H or a U or an inverted U-like profile. Cam follower according to claim 8, characterized in that, in the case of the formation of the cam follower ( 1 ) with the H or vice versa U-like profile, a lateral guidance of the valve stem at one end ( 4 ) directly through internal surfaces ( 26 ) of the side walls ( 2 ) is present. Cam follower according to claim 1, characterized in that from the bottom ( 8th ) of the transverse section ( 6 ) at one end ( 4 ) protrude two spaced tabs for lateral guidance of the valve stem. Cam follower according to claim 10, characterized in that the tabs in one piece from the underside ( 8th ) of the transverse section ( 6 ) and are shown without cutting as stamped or extruded. Cam follower according to claim 1, characterized in that the side walls ( 2 ) consist of thin-walled lightweight material such as sheet metal and are optionally generated punching technology. Cam follower according to claim 1, characterized in that the transverse sections ( 6 . 7 ) out thin-walled lightweight material such as sheet metal and optionally punching technology are made. Cam follower according to claim 1, characterized in that the cam follower ( 1 ) with its components cross sections ( 6 . 7 ), Side walls ( 2 ) is joined in one operation in a device. Cam follower according to claim 6, characterized in that the cam follower ( 1 ) with its components cross sections ( 6 . 7 ), Side walls ( 2 ) as well as axis ( 22 ) with roll ( 23 ) is joined in one operation in a device. Cam follower according to claim 1, characterized in that only one of the transverse sections ( 6 . 7 ) or both sections ( 6 . 7 ) is or are provided with a wear protection measure such as a heat treatment or at least one applied layer, the side walls ( 2 ) are present untreated. Cam follower according to one of claims 2-5, characterized in that the longitudinal slots ( 13 . 14 ) are represented by punching. Cam follower according to claim 1 or 2, characterized in that a connection of the side walls ( 2 ) with the transverse sections ( 6 . 7 ) is represented by a pressing, welding, soldering, gluing, caulking or shrinking connection.