Claims:1. A high pressure pump (10), said pump (10) comprising
- a housing (12) having a carter (13) ;
- a metering unit (14) fitted to said housing (12);
characterized 5 in that:
- a throttle bore (15) made on said housing (12) in proximity to said metering
unit (14), said throttle bore (15) comprises at least two sections (15(a),
15(b)), wherein one section (15(a)) has larger dimensions than other section
(15(b)).
2. The high-pressure pump (10) as claimed in claim 1, wherein said throttle bore
(15) comprises a first section (15(a)) and a second section (15(b)), said throttle
bore (15) connects said metering unit (14) and said carter (13) of said housing
(12).
3. The high-pressure pump (10) as claimed in claim 1, wherein said first section
(15(a)) has a fiasco-conical shape and said second section (15(b)) has a
cylindrical shape.
4. The high-pressure pump (10) as claimed in claim 1, wherein said throttle bore
(15) is made as an integral component of said housing (12) and an open end of
said throttle bore (15) is connected to said metering unit (14).
5. The high-pressure pump (10) as claimed in claim 4, wherein said throttle bore
25 (15) is connected at a bottom portion of said metering unit (14).
6. The high-pressure pump (10) as claimed in claim 1, wherein said throttle bore
(15) is made of three sections, a first section, and a second section and a third
section, wherein said first section is larger than said second section and said
30 third section.
7. The high pressure pump (10) as claimed in claim 1, wherein when said metering
unit (14) is in closed condition, the leaked fuel in said metering unit (14) flows
into a back flow path (16) via said throttle bore (15) and said carter (13) of said
housing (12).
8. The high-pressure pump (10) as claimed in claim 1, wherein said throttle bore
(15) is made in the form of a L-shape and is connected to at least one portion of
the metering unit (14) for allowing the flow of fuel from said metering unit (14).
9. The high-pressure pump (10) as claimed in claim 1, wherein said throttle bore (15) is made of an aluminum material. , Description:The high-pressure pump 10 comprises a housing 12 having a carter 13 and a metering
unit 14 fitted to the housing 12. The high-pressure pump 10 further comprises 5 a throttle
bore 15 made on the housing 12 in proximity to the metering unit 14. The throttle bore
15 comprises at least two sections (15(a), 15(b)), wherein one section 15(a) has larger
dimensions than other section 15(b). With the above disclosed throttle bore 15 in the
pump 10, the three level throttle in housing 12 can be eliminated, thus reduction in tool
10 variants and reduction in the cycle time can be achieved.
(Figure 1)