GB2260610A - Adjustor - Google Patents
Adjustor Download PDFInfo
- Publication number
- GB2260610A GB2260610A GB9121905A GB9121905A GB2260610A GB 2260610 A GB2260610 A GB 2260610A GB 9121905 A GB9121905 A GB 9121905A GB 9121905 A GB9121905 A GB 9121905A GB 2260610 A GB2260610 A GB 2260610A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stop element
- fuel
- pump
- stop
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/01—Control of temperature without auxiliary power
- G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
- G05D23/08—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature with bimetallic element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
- F02D1/025—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by means dependent on engine working temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—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
- F02M59/447—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 means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
Abstract
An adjusting screw for use as a maximum fuel stop for a reciprocating plunger fuel injection pump of an internal combustion engine comprises a body 10 which is in screw thread engagement with a support member 12 of the pump. The body is hollow and a stop element 15 is partly located in the body in screw thread engagement therewith. A temperature responsive means in the form of a bimetallic element 19 is housed within the body and is coupled to the body and the stop element so as to produce relative rotation therebetween as the temperature varies. <IMAGE>
Description
ADJUSTOR
This invention relates to an adjusting screw of the kind which forms the so-called maximum fuel stop of a reciprocating plunger fuel injection pump intended to supply fuel to an internal combustion engine.
One example of such a pump is a rotary distributor type of pump in which a pair of pumping plungers are mounted in a radial bore in a distributor member and the plungers are moved inwardly to deliver fuel, by the action of cam lobes formed on the internal surface of an annular cam ring. The outward movement of the plungers under the action of fuel supplied to the bore is controlled by a throttle which itself is controlled by a speed governor but the maximum outward movement of the plungers is determined by angularly adjustable stop rings the setting of which is determined by a maximum fuel stop. Another form of pump has a quantity control member the setting of which is determined by a governor and the extent of movement of the control member in the direction to increase the amount of fuel supplied by the pump, is determined by the maximum fuel stop.In both cases therefore irrespective of the setting of the operator demand control which is associated with the governor, there is a maximum amount of fuel which can be supplied by the pump to the associated engine and this is determined by the maximum fuel stop.
The stop takes the form of an adjusting screw which is mounted in the body of the pump and which once set, is locked in position. During the operation of the fuel pump and the associated engine, the temperature of fuel supplied to the bore will vary and with increasing fuel temperature the fuel will be less dense. The maximum volume of fuel which is pumped when the maximum fuel stop is in operation, remains the same but with increasing temperature, the mass of fuel reduces because of the reduced density. This means that the power output of the engine will fall. Moreover, with increasing temperature the viscosity of the fuel decreases and hence there will be increased leakage within the pump resulting in a reduction in the volume of fuel supplied to the engine.
The object of the present invention is to provide an adjusting screw for the purpose specified and which incorporates a temperature responsive element.
According to the invention an adjusting screw for the purpose specified comprises a body having a screw threaded section for engagement within a support member of the fuel injection pump, a stop element carried by the body and temperature responsive means for moving the stop element relative to the body as the temperature varies.
An example of an adjusting screw in accordance with the invention will now be described with reference to the accompanying drawing which shows a sectional side elevation of the device.
Referring to the drawing the adjusting screw comprises a hollow elongated body 10 formed with a screw thread 11. The body 10 in use, is in screw thread engagement within an aperture formed in a support member 12 of the pump which conveniently is the housing of the pump. A lock nut 13 is provided to secure the body in position once adjustment has been effected.
The internal surface of the inner end portion of the body is formed in the particular example with a multi-start screw thread 14 and engaged with this thread is a stop element 15 which projects from the end of the body. The stop element is provided with a non-circular section bore 16 in which there is slidably located a complementarily shaped plug 17 having a head 18. Secured at one end of the head 18 is a coiled bimetallic strip 19 the other end of which is secured to a head 20 formed on a locating peg 21 which extends through an opening at the outer end of the adjusting screw. The peg 21 is secured against rotation conveniently by silver soldering or the like.
In operation, as the temperature to which the bimetallic element is subjected varies, angular movement will be imparted to the peg 17 and this angular movement will also be imparted to the stop element 15. By virtue of the screw thread connection between the stop element and the body, the stop element will move axially relative to the body, relative axial movement taking place between the peg and the stop element.
The end face of the stop element is engaged by in the particular example, a peg 22 which is mounted on an arm 23, the arm 23 being biased by a spring 24 so that the peg 22 is held in engagement with the stop element.
The arm 23 is associated with a fuel quantity control element of the pump and as the temperature increases, it is arranged that the stop element retracts into the body 10 to allow the arm 23 to be moved to allow an increase in the maximum quantity of fuel which can be supplied to the associated engine. The initial adjustment of the adjusting screw within the support member 12 is carried out at a standard fuel and pump temperature in the normal way and as the temperature increases the stop element 15 will retract to allow an increased volume of fuel to be supplied to the engine to compensate for the reduced density of the fuel and also to compensate for increased leakage of fuel within the pump.
Although in the example the connection between the body 10 and the stop element has been described as a multi start screw thread a single start thread can be employed. Moreover, the equivalent of a screw thread connection can be obtained using a helical groove in one of the components and a pin or pins carried on the other component and engaged in the groove.
Claims (3)
1. An adjusting screw for use as a maximum fuel stop of a reciprocating plunger fuel injection pump for supplying fuel to an internal combustion engine, the screw comprising a body having a screw threaded section for engagement with a support member of the pump, a stop element mounted on the body and movable relative thereto and temperature responsive means acting between the body and the stop element for moving the stop element relative to the body as the temperature varies.
2. A screw according to Claim 1, in which said body is of hollow form, said stop element being located within the body and having a screw thread connection therewith, a portion of said stop element projecting from the body for engagement by a part of the fuel quantity control of the pump and said temperature responsive means comprising a bimetallic element for imparting relative rotary movement between the body and part as the temperature varies.
3. A screw according to Claim 2, in which said bimetallic element comprises a coiled strip which is located in the body and which at one end is secured to the body and at its other end is secured to a peg which is of non-circular form and is slidably located in a complementary shaped bore in the element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9121905A GB2260610A (en) | 1991-10-16 | 1991-10-16 | Adjustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9121905A GB2260610A (en) | 1991-10-16 | 1991-10-16 | Adjustor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9121905D0 GB9121905D0 (en) | 1991-11-27 |
| GB2260610A true GB2260610A (en) | 1993-04-21 |
Family
ID=10702980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9121905A Withdrawn GB2260610A (en) | 1991-10-16 | 1991-10-16 | Adjustor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2260610A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB374046A (en) * | 1929-11-26 | 1932-05-26 | Georges Gaston Royer | Improvements in or relating to thermostats |
| GB440111A (en) * | 1934-06-20 | 1935-12-20 | Charles Bell Walker | Improvements in or relating to thermostatically-operated valve control devices |
| GB540237A (en) * | 1940-07-02 | 1941-10-09 | Frank Augustus Talbot | Improvements in or relating to thermally operated release means, applicable to electric switches |
| GB888655A (en) * | 1957-10-15 | 1962-01-31 | Standard Thomson Corp | Pressure-responsive actuating devices |
| GB1131660A (en) * | 1967-10-12 | 1968-10-23 | Maclaren Controls Ltd | Improved thermostatic control device |
-
1991
- 1991-10-16 GB GB9121905A patent/GB2260610A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB374046A (en) * | 1929-11-26 | 1932-05-26 | Georges Gaston Royer | Improvements in or relating to thermostats |
| GB440111A (en) * | 1934-06-20 | 1935-12-20 | Charles Bell Walker | Improvements in or relating to thermostatically-operated valve control devices |
| GB540237A (en) * | 1940-07-02 | 1941-10-09 | Frank Augustus Talbot | Improvements in or relating to thermally operated release means, applicable to electric switches |
| GB888655A (en) * | 1957-10-15 | 1962-01-31 | Standard Thomson Corp | Pressure-responsive actuating devices |
| GB1131660A (en) * | 1967-10-12 | 1968-10-23 | Maclaren Controls Ltd | Improved thermostatic control device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9121905D0 (en) | 1991-11-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |