High-pressure pump

Patent metadata

Field	Value
Publication number	US-10851749-B2
Application number	US-201615770295-A
Country	US
Kind code	B2
Filing date	Sep 13, 2016
Priority date	Oct 26, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

The invention relates to a high-pressure pump ( 1 ), in particular for a motor vehicle, for conveying a fluid, in particular fuel, e.g. diesel fuel, comprising a drive shaft having at least one cam, at least one piston, at least one cylinder ( 6 ) for mounting the at least one cam, wherein the at least one piston is supported on the drive shaft by the at least one cam, so that a translational motion can be carried out by the at least one cam as a result of a rotary motion of the drive shaft, at least one cover cap ( 8 ), which is attached indirectly or directly to the outside of the cylinder ( 6 ), wherein one end ( 18 ) of the at least one cover cap ( 8 ) rests on a projection ( 16 ) of the remaining high-pressure pump ( 1 ) for the interlocking attachment of the end ( 18 ) of the cover cap ( 8 ) to the projection ( 16 ).

First claim

The invention claimed is:

1. A high pressure pump ( 1 ) for delivering a fluid, the high pressure pump comprising
a drive shaft ( 2 ) with at least one cam ( 3 ),
at least one piston ( 5 ),
at least one cylinder ( 6 ) in which the at least one piston ( 5 ) is mounted,
the at least one piston ( 5 ) being supported on the drive shaft ( 2 ) with the at least one cam ( 3 ), with the result that a translational movement can be carried out by the at least one piston ( 5 ) on the basis of a rotational movement of the drive shaft ( 2 ), and
at least one covering cap ( 8 ) which is fastened indirectly to the cylinder ( 6 ) on an outer side,
wherein an end ( 18 ) of the at least one covering cap ( 8 ) lies on a projection ( 16 ) of the high pressure pump ( 1 ) in order to fasten the end ( 18 ) of the covering cap ( 8 ) to the projection ( 16 ) in a positively and non-positively locking manner, and
wherein the at least one covering cap ( 8 ) lies on the high pressure pump ( 1 ) with an elastic prestressing force.

2. The high pressure pump as claimed in claim 1 , characterized in that the projection ( 16 ) is configured on the high pressure pump ( 1 ) on the outer side and/or the projection ( 16 ) is configured as an undercut ( 42 ) and/or the projection ( 16 ) is configured in the radial direction ( 41 ) with regard to a longitudinal axis ( 17 ) of the cylinder ( 6 ), and the end ( 18 ) of the at least one covering cap ( 8 ) lies on an axial stop ( 43 ) of the projection ( 16 ).

3. The high pressure pump as claimed in claim 1 , characterized in that the projection ( 16 ) is configured in the circumferential direction or tangential direction with regard to a longitudinal axis ( 17 ) of the cylinder ( 6 ) and/or the projection ( 16 ) is formed by a ring ( 44 ) or a nut ( 45 ) on the cylinder ( 6 ).

4. The high pressure pump as claimed in claim 1 , characterized in that the at least one covering cap ( 8 ) has a substantially central opening ( 48 ).

5. The high pressure pump as claimed in claim 4 , characterized in that the at least one covering cap ( 8 ) has a substantially radially configured supporting section ( 50 ) and a substantially axially configured supporting section ( 51 ).

6. The high pressure pump as claimed in claim 5 , characterized in that the opening ( 48 ) is configured on the supporting section ( 50 ).

7. The high pressure pump as claimed in claim 4 , characterized in that the end ( 18 ) of the at least one covering cap ( 8 ) which lies on the projection ( 16 ) of the remaining high pressure pump ( 1 ) is an edge ( 49 ) of the opening ( 48 ).

8. The high pressure pump as claimed in claim 4 , characterized in that an electric plug ( 52 ) is arranged in the opening ( 48 ).

9. The high pressure pump as claimed in claim 1 , characterized in that a cutout ( 55 ) for a fuel nozzle ( 54 ) is configured on the at least one covering cap ( 8 ), and/or the cylinder ( 6 ) comprises a cylinder head ( 14 ) and/or a mounting cylinder ( 15 ).

10. The high pressure pump as claimed in claim 1 , characterized in that the at least one covering cap ( 8 ) is configured at least partially from an elastic plastic, and/or the at least one covering cap ( 8 ) is configured at least partially from a material with a modulus of elasticity of less than 5, 1, or 0.2 kN/mm 2 .

11. A method for producing a high pressure pump ( 1 ) as claimed in claim 1 , the method comprising the steps:
provision of a drive shaft ( 2 ) with at least one cam ( 3 ),
provision of at least one piston ( 5 ),
provision of at least one cylinder ( 6 ) in which the at least one piston ( 5 ) is mounted,
provision of at least one covering cap ( 8 ),
assembling of the at least one drive shaft ( 2 ), the at least one piston ( 5 ) and the at least one cylinder ( 6 ), with the result that the at least one piston ( 5 ) is supported on the drive shaft ( 2 ) with the at least one cam ( 3 ), and a translational movement can be carried out by the at least one piston ( 5 ) on the basis of a rotational movement of the drive shaft ( 2 ), and
fastening of the at least one covering cap ( 8 ) indirectly on the cylinder ( 6 ) on the outer side,
characterized in that
the covering cap ( 8 ) is first of all stretched elastically for fastening purposes, and an elastic recovery is subsequently carried out, with the result that an end ( 18 ) of the at least one covering cap ( 8 ) lies on the projection ( 16 ) of the remaining high pressure pump ( 1 ) on account of the elastic recovery, and the at least one covering cap ( 8 ) is fastened to the projection ( 16 ) in a positively and non-positively locking manner as a result.

12. The method as claimed in claim 11 , characterized in that first of all an electric plug ( 52 ) is mounted, and subsequently the at least one covering cap ( 8 ) is fastened, and/or the at least one covering cap ( 8 ) is stretched in the radial direction ( 41 ) with regard to the longitudinal axis ( 17 ) of the cylinder ( 6 ) and is recovered elastically.

13. The method as claimed in claim 11 , characterized in that the at least one covering cap ( 8 ) is stretched substantially at an edge ( 49 ) of an opening ( 48 ) as the end ( 18 ) of the at least one covering cap ( 8 ), with the result that the size of the opening ( 48 ) is increased by way of the stretching, and the elastic recovery is subsequently carried out substantially at the edge ( 49 ) of the opening ( 48 ), and/or the electric plug ( 52 ) which has already been mounted is first of all guided through the opening ( 48 ) of the at least one covering cap ( 8 ), and the elastic stretching of the at least one covering cap ( 8 ) is subsequently carried out, and/or the covering cap ( 8 ) is stretched, and the covering cap ( 8 ) is subsequently fastened on the remaining high pressure pump ( 1 ) with an elastic prestress.

14. The method as claimed in claim 11 , characterized in that the at least one covering cap ( 8 ) is stretched, by the covering cap ( 8 ) being pushed onto the high pressure pump ( 1 ) on the outer side in the axial direction ( 40 ), and the axial movement of the at least one covering cap ( 8 ) bringing about stretching of the at least one covering ( 8 ) on account of the outer-side geometry of the high pressure pump ( 1 ).

15. A high pressure injection system ( 36 ) for an internal combustion engine ( 39 ), the high pressure injection system comprising
a high pressure pump ( 1 ) as claimed in claim 1 , and
a high pressure rail ( 30 ) communicating with the high pressure pump.

16. The high pressure injection system as claimed in claim 15 , further comprising a prefeed pump for delivering a fuel from a fuel tank to the high pressure pump.

17. The high pressure pump as claimed in claim 1 , characterized in that the projection ( 16 ) is configured in the circumferential direction or tangential direction with regard to a longitudinal axis ( 17 ) of the cylinder ( 6 ) and/or the projection ( 16 ) is formed by a ring ( 44 ) or a union nut ( 45 ) on the cylinder ( 6 ).

18. The high pressure pump as claimed in claim 1 , characterized in that the at least one covering cap ( 8 ) lies on the high pressure pump ( 1 ) with an elastic prestressing force and/or the at least one covering cap ( 8 ) is configured completely from a thermoplastic elastomer, and/or the at least one covering cap ( 8 ) is configured completely from a material with a modulus of elasticity of less than 5, 1, or 0.2 kN/mm 2 .

19. The method as claimed in claim 11 , characterized in that the at least one covering cap ( 8 ) is stretched substantially at an edg

Assignees

• Bosch Gmbh Robert

Inventors

• Lucarelli Francesco
• Linden Dietmar Van Der
• Laepple Karl-Heinz

Classifications

• F02M59/44 Primary

  Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} · CPC title

• F02M59/48

  Assembling; Disassembling; Replacing · CPC title

• F02M59/06

  with cylinders arranged radially to driving shaft, e.g. in V or star arrangement · CPC title

• F02M59/102 Primary

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

• F02M63/0265

  Pumps feeding common rails · CPC title