Carburetor arrangement for an internal combustion engine

Abstract

A carburetor (1) for an internal combustion engine has an intake channel section (3) wherein a throttle element and a choke element are supported to pivot about respective rotational axes (34, 35). The carburetor (1) has a starter unit which has an operating position, an off position and at least one start position. In the start position, the starter unit fixes defined positions of the throttle element and the choke element. A simple manipulability and a multifaceted operational use of the carburetor (1) are achieved when the starter unit includes an actuating lever (29, 69) and an intermediate lever (18, 68) having respective rotational axes (28, 37) which are at a distance (c) to each other at least at the elevation of the intermediate lever (18, 68) and when the actuating lever (29, 69) acts on the throttle element via the intermediate lever (18, 68).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described with reference to the drawings wherein:

FIG. 1 is a schematic section view of a carburetor;

FIG. 2 is a perspective view of a carburetor arrangement having a starter unit in the off position;

FIG. 3 is a side elevation view of the carburetor of FIG. 2 in the off position;

FIG. 4 is a perspective view of the carburetor arrangement in the cold-start position;

FIG. 5 is a side elevation view of the carburetor arrangement of FIG. 2 in the cold-start position;

FIG. 6 is a perspective view of the carburetor arrangement of FIG. 2 in the warm-start position;

FIG. 7 is a side elevation view of the carburetor arrangement of FIG. 2 in the warm-start position;

FIG. 8 is a perspective view of the carburetor arrangement of FIG. 2 in the operating position;

FIG. 9 is a side elevation view of the carburetor arrangement of FIG. 2 in the operating position;

FIG. 10 is a perspective view of the carburetor arrangement of FIG. 2 with a blocked starter unit;

FIG. 11 is a side elevation view of the carburetor arrangement of FIG. 2 with a blocked starter unit;

FIG. 12 is a side elevation view of an embodiment of a carburetor arrangement having a starter unit in the off position;

FIG. 13 is a side elevation view of the carburetor arrangement of FIG. 12 in a cold-start position;

FIG. 14 is a side elevation view of the carburetor arrangement of FIG. 12 in the warm-start position;

FIG. 15 is a side elevation view of the carburetor arrangement of FIG. 12 in the operating position;

FIG. 16 is a perspective view of the control shaft and intermediate lever of the carburetor arrangement of FIGS. 12 to 15;

FIG. 17 is a plan view of the control shaft and the intermediate lever of FIG. 16; and,

FIG. 18 is a perspective view of the carburetor arrangement of FIGS. 12 to 15 also showing a schematic of the carburetor carrier.

Claims

1. A carburetor arrangement for an internal combustion engine, the carburetor arrangement comprising: a carburetor defining an intake channel;a throttle element pivotally mounted in said intake channel to pivot about a first rotational axis;a choke element pivotally mounted in said intake channel to pivot about a second rotational axis;a starter unit having an off position, at least one start position and an operating position;said starter unit determining defined positions of said throttle element and said choke element in said start position;said starter unit including an actuating lever for actuating said starter unit;said actuating lever defining a third rotational axis;said starter unit further including an intermediate lever defining a fourth rotational axis;said third rotational axis and said fourth rotation axis being at a distance (c) to each other at least at the elevation of said intermediate lever; and,said actuating lever being operatively connected to said throttle element via said intermediate lever so as to operate on said throttle element.

2. The carburetor arrangement of claim 1, wherein said fourth rotational axis is at a distance (a) to said first rotational axis; and, said fourth rotational axis is at a distance (b) to said second rotational axis.

3. The carburetor arrangement of claim 1 further comprising a carrier component and said carburetor being mounted on said carrier arrangement; and, said actuating lever and said intermediate lever being supported on said carrier component.

4. The carburetor arrangement of claim 1, wherein said starter unit determines a warm-start position and a cold-start position of said throttle element and said choke element.

5. The carburetor arrangement of claim 1, wherein a defined position of said throttle element is assigned to each position of said intermediate lever.

6. The carburetor arrangement of claim 5, wherein said carburetor arrangement further comprises a pin connected to said throttle element; said intermediate lever comprises a bifurcated element aligned radially to said fourth rotational axis; and, said pin projecting into said bifurcated element.

7. The carburetor arrangement of claim 1, wherein said actuating lever has a guide piece; and, said intermediate lever has a guide which lies on said guide piece in said start position.

8. The carburetor arrangement of claim 7, wherein said starter unit determines a warm-start position; and, said actuating lever includes a stop on which said guide piece lies in said warm-start position; and, said stop and said guide piece conjointly defining a catch position.

9. The carburetor arrangement of claim 1, wherein said actuating lever has a choke actuator for acting on said choke element in said start position of said starter unit.

10. The carburetor arrangement of claim 1, wherein the position of said intermediate lever is coupled to the position of said actuating lever in every position of said intermediate lever.

11. The carburetor arrangement of claim 10, wherein said actuating lever has a guide slot formed thereon and said intermediate lever has a pin guided in said guide slot; and, the position of said intermediate lever is coupled to the position of said actuating lever via said guide pin.

12. The carburetor arrangement of claim 11, wherein said actuating lever is configured of two parts and said guide slot is disposed on both of said parts; and, said intermediate lever is coupled to said actuating lever on both sides of said intermediate lever.

13. The carburetor arrangement of claim 1, wherein said throttle element has a throttle arm connected thereto; and, said intermediate lever has an arm coacting with said throttle arm.

14. The carburetor arrangement of claim 13, wherein said starter unit has a warm-start position; said throttle arm and said arm of said intermediate lever determine a detent position in said warm-start position; and, a defined position of said throttle element is assigned to said detent position.

15. The carburetor arrangement of claim 1, wherein said internal combustion engine has an ignition system; and said carburetor arrangement further comprising a contact spring for providing an electrically conductive connection to said ignition system.

16. The carburetor arrangement of claim 15, wherein said contact spring lies on said actuating lever; and, said actuating lever has a contact element contacting said contact spring in said off position of said starter unit.

17. The carburetor arrangement of claim 15, wherein said carburetor arrangement further comprises a control shaft; said actuating lever is fixedly connected to said control shaft; and, said control shaft has a contact element for contacting said contact spring in said off position of said starter unit.

18. The carburetor arrangement of claim 15, wherein said starter unit has a warm-start position; said contact spring biases said actuating lever in said warm-start position in a direction toward said operating position; and, said actuating lever is released when said throttle element pivots in a direction toward the full-load position thereof and said starter unit pivots from said warm-start position into said operating position.

19. The carburetor arrangement of claim 15, wherein said starter unit has a cold-start position and a warm-start position; said actuating lever is biased by said contact spring opposite to the direction of movement toward said warm-start position when said actuating lever is in said cold-start position; and, said carburetor arrangement further comprises a stop defining the position of said actuating lever.

20. The carburetor arrangement of claim 1, further comprising a control shaft; and, said actuating lever being fixedly connected to said control shaft; and, said control shaft defining a rotational axis extending transversely to the flow direction in said intake channel.

21. The carburetor arrangement of claim 1, wherein said throttle element is actuated by a bowden cable which is connected to said throttle element on a side of said carburetor lying opposite said actuating lever.

22. The carburetor arrangement of claim 1, wherein said intermediate lever blocks the actuation of said starter unit in said operating position thereof and in the idle position of said throttle element.

23. The carburetor arrangement of claim 22, wherein said intermediate lever has a latch hook which coacts with a latch lug on said actuating lever in said operating position of said starter unit and in the idle position of said throttle element.