Manually actuatable feed pump and fuel system with a feed pump

Patent metadata

Field	Value
Publication number	US-10240568-B2
Application number	US-201615376761-A
Country	US
Kind code	B2
Filing date	Dec 13, 2016
Priority date	Dec 15, 2015
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A manually actuated feed pump is provided with a primer bulb to be manually actuated by an operator. The primer bulb has a pump chamber. A travel-controlled valve connects the pump chamber to a fuel line. The travel-controlled valve has a valve member that is moved by an actuation travel of the primer bulb into an open position that opens the travel-controlled valve. A first spring is operatively connected to the valve member and to the primer bulb. The primer bulb acts through the first spring on the valve member.

First claim

What is claimed is:

1. A manually actuated feed pump comprising:
a primer bulb configured to be manually actuated by an operator, wherein the primer bulb comprises a pump chamber;
a travel-controlled valve connecting the pump chamber to a fuel line;
wherein the travel-controlled valve comprises a valve member, wherein the valve member is moved by an actuation travel of the primer bulb into an open position that opens the travel-controlled valve;
a first spring operatively connected to the valve member and to the primer bulb, wherein the primer bulb acts through the first spring on the valve member.

2. The feed pump according to claim 1 , wherein the primer bulb acts immediately on the first spring.

3. The feed pump according to claim 2 , wherein the first spring is secured against rotation relative to the primer bulb.

4. The feed pump according to claim 1 , wherein the first spring in a non-actuated state of the primer bulb has a spacing relative to the primer bulb.

5. The feed pump according to claim 1 , wherein the actuation travel of the primer bulb amounts to at least two times an actuation travel of the valve member for moving the valve member into the open position.

6. The feed pump according to claim 1 , further comprising a second spring, wherein the second spring is acting on the valve member in a closing direction of the travel-controlled valve.

7. The feed pump according to claim 6 , wherein a spring constant of the second spring is greater than a spring constant of the first spring.

8. The feed pump according to claim 6 , further comprising an intermediate element, wherein the valve member is secured on the intermediate element.

9. The feed pump according to claim 8 , wherein the intermediate element is arranged between the first spring and the second spring.

10. The feed pump according to claim 8 , wherein the first spring and the second spring are supported on the intermediate element, respectively.

11. The feed pump according to claim 8 , wherein the intermediate element comprises at least one through passage connecting the pump chamber with a chamber that is formed between the intermediate element and a pump housing of the feed pump.

12. The feed pump according to claim 8 , wherein the intermediate element is arranged in a receptacle of a pump housing of the feed pump, wherein the receptacle is formed by a wall and the wall is contacting an inner side of the primer bulb.

13. The feed pump according to claim 1 , wherein the first spring is a pressure spring.

14. The feed pump according to claim 1 , wherein the travel-controlled valve comprises at least one connecting opening that is controlled by the travel-controlled valve, wherein the at least one connecting opening connects the fuel line and the pump chamber, wherein the at least one connecting opening forms an inflow opening into the pump chamber and an outflow opening from the pump chamber.

15. A fuel system comprising a feed pump according to claim 1 , wherein a pressure in the fuel system amounts to an overpressure of 0 bar to 2 bar relative to ambient pressure.

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Dietenberger Michael
• Bannick Ulf
• Sabelberg Isgard
• Deigendesch Tobias

Classifications

• F04B2201/0401

  Carter pressure · CPC title

• F04B23/06

  the pumps being all of reciprocating positive-displacement type · CPC title

• F02M59/42

  for starting of engines {(supply of excess fuel F02M59/447)} · CPC title

• F04B49/08

  Regulating by delivery pressure · CPC title

• F02M37/007

  characterised by its use in vehicles, in stationary plants or in small engines, e.g. hand held tools · CPC title