Camshaft for a pump, in particular a high pressure fuel pump, and pump having a camshaft

Patent metadata

Field	Value
Publication number	US-10808665-B2
Application number	US-201816641393-A
Country	US
Kind code	B2
Filing date	Jul 27, 2018
Priority date	Aug 23, 2017
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A camshaft ( 24 ), in particular for a pump ( 10 ), is proposed. The camshaft ( 24 ) has at least two cams ( 26, 28 ) which are arranged next to one another in the direction of the longitudinal axis ( 25 ) of the camshaft ( 24 ) and the cam elevations of which are arranged offset with respect to one another around the longitudinal axis ( 25 ) of the camshaft ( 24 ). An intermediate region ( 30 ) is provided between two adjacent cams ( 26, 28 ), and at least one bearing region ( 32 ) is arranged next to the cams ( 26, 28 ) in the direction of the longitudinal axis ( 25 ) of the camshaft ( 24 ). The intermediate region ( 30 ) runs in axial longitudinal sections which contain the longitudinal axis ( 25 ) of the camshaft ( 24 ), at a radial spacing (r 1, r 2 ) from the longitudinal axis ( 25 ) of the camshaft ( 24 ), which radial spacing (r 1, r 2 ), starting from the adjacent cam ( 26 ) with the smaller cam elevation (h 1 ) in the respective axial longitudinal section, increases towards the adjacent cam ( 28 ) with the greater cam elevation (h 2 ) in the respective axial longitudinal section.

First claim

The invention claimed is:

1. A camshaft having at least two cams ( 26 , 28 ) which in the direction of a longitudinal axis ( 25 ) of the camshaft ( 24 ) are disposed beside one another, cam elevations of said cams being mutually offset about the longitudinal axis ( 25 ) of the camshaft ( 24 ), wherein an intermediate region ( 30 ) is provided between the cams ( 26 , 28 ), and the camshaft having at least one bearing region ( 32 ) which in the direction of the longitudinal axis ( 25 ) of the camshaft ( 24 ) is disposed beside the cams ( 26 , 28 ), characterized in that the intermediate region ( 30 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) runs at a radial spacing (r 1 , r 2 ) from the longitudinal axis ( 25 ) of the camshaft ( 24 ), said radial spacing (r 1 , r 2 ) proceeding from an adjacent one of the cams ( 26 ) having in a respective axial longitudinal section a smaller cam elevation (h 1 ) so as to increase toward an adjacent other one of the cams ( 28 ) having in a respective axial longitudinal section a larger cam elevation (h 2 ).

2. The camshaft as claimed in claim 1 , characterized in that the intermediate region ( 30 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) in peripheral regions ( 30 a ) of said intermediate region ( 30 ) that face the adjacent cams ( 26 , 28 ) runs in each case at a radial spacing (r 1 , r 2 ) from the longitudinal axis ( 25 ) of the camshaft ( 24 ) which is of equal size as or only slightly smaller than the radial spacing (h 1 , h 2 ) of the cam elevation of a respective one of the adjacent cams from the longitudinal axis ( 25 ) of the camshaft ( 24 ).

3. The camshaft as claimed in claim 1 , characterized in that the intermediate region ( 30 ) between the cams ( 26 , 28 ) has a stepless profile.

4. The camshaft as claimed in claim 1 , characterized in that the intermediate region ( 30 ) in peripheral regions ( 30 a ) thereof that face the adjacent cams ( 26 , 28 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) runs in each case at least almost parallel to the longitudinal axis ( 25 ) of the camshaft ( 24 ).

5. The camshaft as claimed in claim 1 , characterized in that the intermediate region ( 30 ) in a central region ( 30 b ) that lies between peripheral regions ( 30 a ) of said intermediate region ( 30 ) that face the adjacent cams ( 26 , 28 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) has a curved profile.

6. The camshaft as claimed in claim 1 , characterized in that the intermediate region ( 30 ) in a central region ( 30 b ) that lies between peripheral regions ( 30 a ) of said intermediate region ( 30 ) that face the adjacent cams ( 26 , 28 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) has a straight profile that is inclined in terms of the longitudinal axis ( 25 ) of the camshaft ( 24 ).

7. A pump having at least two pump elements ( 12 ) which have in each case one pump piston ( 18 ), and having a camshaft ( 24 ) by way of which the pump pistons ( 18 ) are at least indirectly driven in a reciprocating stroke movement, characterized in that the camshaft ( 24 ) has at least two cams ( 26 , 28 ) which in the direction of a longitudinal axis ( 25 ) of the camshaft ( 24 ) are disposed beside one another, cam elevations of said cams being mutually offset about the longitudinal axis ( 25 ) of the camshaft ( 24 ), wherein an intermediate region ( 30 ) is provided between the cams ( 26 , 28 ), and the camshaft has at least one bearing region ( 32 ) which in the direction of the longitudinal axis ( 25 ) of the camshaft ( 24 ) is disposed beside the cams ( 26 , 28 ), and wherein the intermediate region ( 30 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) runs at a radial spacing (r 1 , r 2 ) from the longitudinal axis ( 25 ) of the camshaft ( 24 ), said radial spacing (r 1 , r 2 ) proceeding from an adjacent one of the cams ( 26 ) having in a respective axial longitudinal section a smaller cam elevation (h 1 ) so as to increase toward an adjacent other one of the cams ( 28 ) having in a respective axial longitudinal section a larger cam elevation (h 2 ).

8. The pump as claimed in claim 7 , characterized in that the intermediate region ( 30 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) in peripheral regions ( 30 a ) of said intermediate region ( 30 ) that face the adjacent cams ( 26 , 28 ) runs in each case at a radial spacing (r 1 , r 2 ) from the longitudinal axis ( 25 ) of the camshaft ( 24 ) which is of equal size as or only slightly smaller than the radial spacing (h 1 , h 2 ) of the cam elevation of a respective one of the adjacent cams from the longitudinal axis ( 25 ) of the camshaft ( 24 ).

9. The pump as claimed in claim 7 , characterized in that the intermediate region ( 30 ) between the cams ( 26 , 28 ) has a stepless profile.

10. The pump as claimed in claim 7 , characterized in that the intermediate region ( 30 ) in peripheral regions ( 30 a ) thereof that face the adjacent cams ( 26 , 28 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) runs in each case at least almost parallel to the longitudinal axis ( 25 ) of the camshaft ( 24 ).

11. The pump as claimed in claim 7 , characterized in that the intermediate region ( 30 ) in a central region ( 30 b ) that lies between peripheral regions ( 30 a ) of said intermediate region ( 30 ) that face the adjacent cams ( 26 , 28 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) has a curved profile.

12. The pump as claimed in claim 7 , characterized in that the intermediate region ( 30 ) in a central region ( 30 b ) that lies between peripheral regions ( 30 a ) of said intermediate region ( 30 ) that face the adjacent cams ( 26 , 28 ) in axial longitudinal sections that contain the longitudinal axis ( 25 ) of the camshaft ( 24 ) has a straight profile that is inclined in terms of the longitudinal axis ( 25 ) of the camshaft ( 24 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Imhof Michael
• Mayer Robert

Classifications

• F02M2200/03

  Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations · CPC title

• F02M2200/02

  Fuel-injection apparatus having means for reducing wear · CPC title

• F02M59/102 Primary

  Mechanical drive, e.g. tappets or cams (F02M45/063 takes precedence) · CPC title

• F01L1/08

  Shape of cams · CPC title

• F01L1/047

  Camshafts · CPC title