SU745376A3 - Plugger pump - Google Patents

Abstract

1458995 Fuel injection pumps SOC D ETUDES DE MACHINES THERMIQUES 26 June 1974 [26 June 1973] 28324/74 Heading F1A A fuel injection pump has an intermediate member 6 dividing the space between the pumping plunger 12 and a tappet 3 into chambers 8, 9, the chamber 9 being pressurizable with gas in order to stop the pump by moving the plunger 12 away from contact, via the intermediate member 6, with the tappet 3. A device 16 sensitive to overspeeding of the engine supplied by the pump controls the supply of gas from a source 15 through a fuel leakage recovery duct 10 to the chamber 9. The chamber 8 is provided with a breather or valve 17, the latter being either located in the pump body 7 or the member 6. The breather or valve prevents pressure building up in the chamber 8 due to leakage past the intermediate member 6. A plunger return spring 13 maintains the intermediate member in contact with the tappet during normal operation.

Description

(54) PLUNGER PUMP

one

This invention relates to the field of high pressure fuel pumps for internal combustion engines.

Known plunger pumps with a constant plunger stroke for internal combustion engines are known, which contain a plunger with a drive located in the housing, between which there is a sliding bearing, made in the form of a sealed piston and forming two closed chambers in the housing, in the first of which there is a plunger. the second is a drive, and the second chamber is equipped with a channel for the return of fuel leaks, and a device that shuts off the fuel supply and is sensitive to different speeds tl.

Such pumps, due to the presence of valves in the supports and the need for an autonomous hydraulic drive, have an increased complexity and insufficient speed when the fuel supply is turned off in the event of the engine running.

The aim of the invention is to simplify the design.

This goal is achieved by the fact that the channel for the return of leaks through the switching device, sensitive to different speeds, is associated with

source of compressed gas. The first chamber contains a device for communicating with the atmosphere. Device for communication with the atmosphere

b made either as an exhaust valve, or as a check valve, or as a safety valve, or as a groove on the toothed rack.

ten

The drawing shows a diagram of the pump.

The plunger 1 is detached from its drive by a sliding support 2, made in the form of a hermetic piston separating the plunger 1 from its drive. Drive unit

15 of the gunner 1 is designed as a control pusher 3 with a roller 4 interacting with a cam 5. The support 2 forms two closed separate chambers 7 and B in the pump casing 6

Claims (6)

W chamber 7 contains a plunger 1, and the second 8 - drive and is equipped with a channel 9 for the return of fuel leaks. Channel 9 is connected via a switching device 10, which is sensitive to spaced speed, to a source 11 of a compressed gaseous medium. In the first chamber 7 there are arranged means 12 for communicating with the atmosphere to take out the gaseous medium passing randomly from the second kiln 8 to the first 7, for example, an outlet: a valve, a non-return valve, a safety valve or grooves on the toothed rack 13. the return spring 14 acts. The lath 13 rotates the plunger 1 when adjusting the amount of cyclic feed through the ring gear 15. When the engine is running, the cam 5 runs onto the roller 4, raises the plunger 3 and the sliding support 2, and therefore also the plunger 1 feeding fuel to the nozzle e. As a result of shutting down or contamination, it is possible to lock the rail 13 in the maximum fuel position. In this case, the engine accelerates up to different revolutions. The switching device 10 responds to the sporadic number of revolutions and passes the compressed gaseous medium (preferably inert gas nitrogen, carbon dioxide) from the source C through channel 9 to chamber 8, where the pressure of the specified medium acts on the support 2, overcomes the force of the spring 14 and raises the plunger 1. as a result, the fuel supply is stopped, and the plunger 1 is held in a raised position. Thanks to the means 12 (non-return valve, etc.), the gases dug into chamber 7 are removed to the atmosphere. The same tool prevents the ingress of engagement of the rail 13 with the ring gear 15. Formula of the invention 1. A constant-stroke plunger pump for an internal combustion engine, containing 1 E1G1 located in the housing of a plunger with a drive, between which I have a sliding bearing, made in the form of a sealed piston and forming in the housing two Pistral chambers, in the first of which there is a plunger, and in the second drive, the second chamber is provided with a channel for returning the leakage and switching off device, sensitive to diversity, characterized in that, c. In order to simplify the design, a leakage return channel through a disconnecting device sensitive to dissimilar velocity is connected to a source of compressed gaseous medium. 2. A POP1 pump, characterized in that the first chamber contains a device for communicating it with the atmosphere. 3. Pump according to claim 2, characterized in that the device for communication with the atmosphere is made in the form of an exhaust valve. 4. Pump according to claim 2, characterized in that the device for communication with the atmosphere is designed as a check valve. 5. The pump according to claim 2, of tl and chas yu and c. The fact that the device for communication with the atmosphere is made in the form of a safety valve. 6. Pump according to claim 2, characterized in that the device for communication with the atmosphere is made in the form of a groove on the toothed rack. Historical and n formations taken into account during the examination 1. Yu.N. Vasilyev. New in the design of ship diesel engines. L., Shipbuilding, 1972, p. 203-204.