GB2031546A - Locking assembly for pressure valve retainers in fuel injection pumps - Google Patents
Locking assembly for pressure valve retainers in fuel injection pumps Download PDFInfo
- Publication number
- GB2031546A GB2031546A GB7932002A GB7932002A GB2031546A GB 2031546 A GB2031546 A GB 2031546A GB 7932002 A GB7932002 A GB 7932002A GB 7932002 A GB7932002 A GB 7932002A GB 2031546 A GB2031546 A GB 2031546A
- Authority
- GB
- United Kingdom
- Prior art keywords
- locking
- pressure valve
- plates
- assembly
- retainers
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 title claims abstract description 14
- 239000007924 injection Substances 0.000 title claims abstract description 14
- 229910000639 Spring steel Inorganic materials 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
-
- 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
- F02M59/48—Assembling; Disassembling; Replacing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/10—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
- F16B39/101—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a plate, spring, wire or ring holding two or more nuts or bolt heads which are mainly in the same plane
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a locking assembly for locking together adjacent pressure valve retainers (10) in a fuel injection pump (11) so that the retainers (10) are prevented from becoming slackened by rotation relative to the pump (11). The locking assembly comprises two locking plates (13) which are each provided with an aperture defined by mutually angled flats (21) which engage over the hexagonal profile (22) of each retainer (10), the locking plates (13) being releasably connected together by means of a bolted connection (16). The locking plates (13) are held locked against the retainers (10) to prevent movement of the plates axially of the retainers (10), by making the plates (13) of spring steel and providing an inclined central portion in each plate, so that tightening of the bolted connection (16) causes the plates (13) to jam against the retainers (10); alternatively, spring fingers around the aperture in the locking plate (13) engage resiliently in an annular groove in, or directly, each retainer (10), or a pair of rings engage grooves in each retainer (10). <IMAGE>
Description
SPECIFICATION
Locking assembly for pressure valve retainers in fuel injection pumps
This invention relates to an assembly for locking together a pair of adjacent pressure valve retainers in a fuel injection pump. A locking assembly is disclosed in German Patent Specification 1220200 but that assembly has the disadvantage that for axial location of the locking plates, and in order to clamp those plates a staybolt to which the plates are attached and which is screwed into the pump housing is provided. This necessitates a specially constructed pump housing and the assembly cannot be fitted in injection pumps in which space is unavailable in the pump housing for a staybolt attachment or in which the pressure valve retainers are fitted in flanged members whose flanges cover the entire face of the pump.Attachment of the locking plates to the fastening screws of such mounting flanges is not desirable since slackening or variation ofthe tightening torque of the screws adversely affects the fuel feed adjustment of the pump.
Locking devices for pressure valve retainers are also known, and are used in many fuel injection pumps (for example, PES 4 M ..., or PE 4 A ..., made by Robert Bosch GmbH, Stuttgart) in which pairs of neighbouring pressure valve retainers are prevented from loosening by means of jaws which abut a body portion of the pressure valve retainers having mutually angled flats and which are clamped together by a screw fastener. These jaws do not require the face of the pump to be specially constructed nor are additional locking means required in order to prevent axial displacement of the jaws.
However, the jaws do have the disadvantage that radial forces act upon the pressure valve retainers and in the case of heavily stressed pump elements which to save space, are of thin-walled construction, may cause leakage at the pump element joint owing to lateral displacement of the pressure valve retainers.
The invention provides in a fuel injection pump an assembly for locking together a pair of similar locking plates, each plate having one end which is shaped to receive a body portion of respective ones of the pressure valve retainers and an opposite free end releasably connected to the free end of the other locking plate so as to prevent slackening by rotation of the pressure valve retainers with respect to the fuel injection pump, wherein the said one end of at least one locking plate of each connected pair of plates is held locked to the body portion of its corresponding pressure valve retainer to prevent movement of that pair of plates axially of the pressure valve retainers.
The locking assembly according to the present invention has the advantage that irrespective of the type of construction of the fuel injection pump and the design of the pump element and pump housing the assembly can befitted as an independent module to the pressure valve retainers since axial location is effected relative to at least one pressure valve retainer and, consequently, the attachment to the pump housing or pump element flange is unnecessary.
It is particularly advantageous if the locking plates are locked in their axial positions following assembly solely owing to their profiling according to the present invention, without additional means, and without the pressure valve retainer being of a special construction.
Three embodiments of the invention will now be described, by way of example with reference to the accompanying drawings, in which;- Figure 1 is a partial side-elevational view of a fuel injection pump provided with one form of locking assembly according to the invention;
Figure 2 is a plan view of the first embodiment shown in Figure 1;
Figures 3 and 4 show respectively a plan view and a side-elevational view of the locking plates used in the first embodiment;
Figure 5 is a partially sectioned side-elevational view ofthe second embodiment, and
Figure 6 is a view corresponding to Figure 5, but relating to a third embodiment of the invention.
Figures 1 and 2 show a fuel injection pump 11, provided with four pressure valve retainers 10. Each pair of adjacent retainers are connected together by a locking assembly 12 to prevent accidental loosening of the pressure valve retainers. Each locking device 12 comprises two identical locking plates 13 (see also Figures 3 and 4), which are releasably connected together by means of a bolted connection 16 comprising a bolt 14 and a nut 15. Each bolt 14 is inserted through a transverse slot 17 formed in a free end of a respective locking plate 12, the slots 17 enabling the locking plates 13 to be assembled in the most favourable position for the bolted connection (Figure 2) irrespective of the assembly position of the pressure valve retainers 10.As shown in Figures 2 and 3, the locking plates 13 are provided at one end 19 with an aperture defined by a continuous series of mutally angled flats 21 which fits over and that the flats grip the hexagon-shaped external profile 22 of a body portion of the pressure valve retainer 10 by six of flats and recesses. The number of recesses in the internal profile of the locking plate 13 are, as is known in the case of socket wrenches, a multiple of the angles of the external profile 22 of the body portion. Alternatively, both members 10 and 13 could be provided with the same number of flats externally and internally respectively. However, the use of the locking device 12 according to the present invention permits the pressure valve retainers 10 to be manufactured economically from standard hexagon bar material.
The locking plates 13, shown individually in Figures 3 and 4, are manufactured from unhardened spring-steel sheet (Ck 85 K+Gaccording to DIN 17222), and are subsequently quenched and tempered to spring hardness, namely, Vickers hardness
HV 500 to 580, so that the material of the finished locking plates 13 corresponds to a Ck 101 K+V spring steel. In its dismantled state portion 18 between the ends of the plate having the slot 17 is offset, or bent, at an oblique angle of preferably between 5 and 10 , relative to the end 19 which has the internal flats 21 (see Figure 4).
The locking assembly 12, shown in Figures 1 and 2, is assembled following adjustment of the pump timing. A locking plate 13 is located over the external profile 22 of each of the body portions two neighbouring pressure valve retainers 10, and the locking plates 13 are bolted together by means of a bolted connection 16. The locking plates 13 are advantageously assembled so that, as shown in the left-hand portion of Figure 1, when the member 19 is pushed straight over the external profile 22, the portions 18 diverge relatively to each other, that is, they form an angle with respect to each other.This position, prior to the tightening of the bolted connection 16 is shown for the locking device 12 which locks the two left-hand pressure valve retainers 10 in
Figure 1, while the locking assembly 12 in the right-hand portion of this Figure is shown with the bolted connection 16 screwed tight. Owing to the clamping together of the portions 18, the ends 19 having the internal flats 21 of the two locking plates 13, tilt and are thereby clamped against the external profile 22 of the pressure valve retainer 10. The flats 21 of the spring-hard locking plates 13 grip the surface of the external profile 22 at a plurality of locations and thereby ensure absolutely positive axial locking of the locking assembly 12, so that additional locking means, for the prevention of axial displacement of the assembly 12, are unnecessary.
The centre-to-centre distance "a" between the centre of the aperture defined by the flats 21 and the slot 17 in the locking plates 13 (see Figures 2 and 3) is approximately the same as the distance "b" between the pressure valve retainers 10. Thus, the bolted connection 16 lies sufficiently far outside the connecting line between the pressure valve retainers 10 that, notwithstanding extremely close spacing of the elements, sufficient leverage is produced to ensure axial locking, and the overall length of the pump is not adversely affected.
In the embodiments, shown in Figures 5 and 6, as compared with the first embodiment, like components have like reference numerals.
In the second embodiment, shown in Figure 5, the locking assembly is designated as 12', and comprises two locking plates 25 and 26, which are bolted together by means of the bolted connection 16. The locking plates 25, 26 are manufactured from thinner sheet metal than the locking plates 13 of the first embodiment and each plate has a respective flange 27,28, extending axially outwardly in the form of an annular on which the mutually angled flats 21 are formed. The flange 27 of the locking plate 25 partially is perforated with a series of slits 29 and is spring loaded with a resilient bias over the external profile 22 of one pressure valve retainer 10' and, in orderto lock the locking assembly 12' axially, engages with a narrow region of its end face 31, in an annular groove 32 formed in the pressure valve retainer 10'.
The remaining region of the flange 27 is located by
its internal flats 21 upon the external profile 22 of the
pressure valve retainer 10', and serves to prevent
rotation of the pressure valve retainer 10'.
The flange 28 of the second locking plate 26 is located purely by its internal flats 21 on the external profile 22 of the pressure valve retainer 10, which in contrast to the pressure valve retainer 10', has no annular groove. In order to be able to use standardised pressure valve retainers, the second pressure valve retainer 10 may, alternatively, be provided with an annular groove 32', as shown by dot-anddash lines, so that errors of assembly are thereby prevented. In the case of this locking assembly 12', axial locking is performed by only one locking plate 25'. Alternatively, the use of two identical locking plates 25 would be possible, but the annular groove 32 on the second pressure valve retainer 10' would then require to be axially offset with respect to the annular groove on the first pressure valve retainer 10' (not shown).
Axial locking of the locking assembly 12' is feasible without an annular groove 32 in the pressure valve retainer 10', in which case, for axial locking, the flange 27 on the locking plate 25 is pressed over the external profile 22 of the pressure valve retainer 10' under radial tension, and grips, by the region 31' of its face, the surface of the external profile 22, since the front edge of the spring-hard material of the locking ring 25 penetrates into the softer material of the pressure valve retainer 10' (not shown.)
In the third embodiment, shown in Figure 6, the locking assembly is designated as 12" and comprises two identical locking plates 26 which, like the second locking plate 26 of the locking device 12' shown in
Figure 5, are located by the flange 28 which is provided with internal flats 21, upon the external profile 22 of the pressure valve retainers here designated as 10". Two locking rings 35, which are mounted on the pressure valve retainer 10" in annular grooves 34 above and below the locking plates 26 serve as locking means. Since the height of the flange 28 is the same as the thickness of the sheet metal of the locking plate 26, and both plates 26 are assembled with the flanges 28 divergently disposed with respect to each other, the annular grooves 34 have the same position in both pressure valve retainers 10", so that standard components may be used throughout the pump 11.
In order to prevent axial play in this locking assembly 12", at least one outwardly extending side of the annular grooves 34 may advantageously be slightly oblique or tapered in form, so that the locking ring 35 is subjected to axial compression following assembly. For zero play, it is also possible to use slightly undulated locking rings 35 (not shown). Alternatively, instead of the two locking rings 35 associated with each locking plate 26, a flange on the pressure valve retainer 10" may be substituted for the lower ring in case this construction is more advantageous from a manufacturing point of view.
Claims (10)
1. In a fuel injection pump an assembly for locking together a pair of adjacent pressure valve retainers which assembly comprises a pair of similar locking plates, each plate having one end which is shaped to receive a body portion of respective ones of the pressure valve retainers and an opposite free end releasably connected to the free end of the other locking plate so as to prevent slackening by rotation of the pressure valve retainers with respect to the fuel injection pump, wherein the said one end of at least one locking plate of each connected pair of plates is held locked to the body portion of its corresponding pressure valve retainer to prevent movement of that pair of plates axially of the pressure valve retainers.
2. An assembly as claimed in claim 1 wherein the free end of each locking plate lies in a plane which is offset at an oblique angle of 5" to 10 with respect to the plane containing the said one end of that plate.
3. An assembly as claimed in claim 2 wherein each pair of locking plates is assembled so that the portions of the plate between their ends diverge with respect to each other, the plates being releasably connected together by means of the bolted connection such that said portions abut each other, and wherein said one end of each plate is thereby stressed so as to be clamped obliquely against the body portion of its corresponding valve retainer.
4. An assembly as claimed in any of the preceding claims wherein the said shaped end of each plate comprises an aperture defined by a continuous series of mutually angled flats, the opposite free end thereof being provided with a transverse slot.
5. An assembly as claimed in claim 4 wherein the centre-to-centre distance between the slot and the centre of the aperture in the locking plate is substantially equal to the distance between the adjacent pressure valve retainers which are locked together.
6. An assembly as claimed in claim 1 wherein at least one of the locking plates of each pair of plates is provided with a partially preforated flange which flange extends outwardly from said one end of that plate to provide an annular hub which hub is defined by a continuous series of mutually angled flats, the plate being pre-stressed into abutment with the external surface of the body portion of the pressure valve retainer so as to prevent movement of that pair of plates axially of the pressure valve retainers.
7. An assembly as claimed in claim 6 wherein only the free end of the flange is pre-stressed so as to be spring loaded into engagement with an annular groove formed in the pressure valve retainer body portion the remaining region of the flange co-operating with an appropriately shaped external profile of the pressure valve retainer.
8. An assembly as claimed in claim 1 wherein annular locking rings engage in corresponding annular grooves formed on either side of said one end of a locking plate in the body portion of at least one pressure valve retainer of each pair so as to prevent movement of that pair of plates axially of the pressure valve retainers.
9. An assembly as claimed in any of the preceding claims wherein the locking plates are manufactured from unhardened spring-steel sheet and are quenched and tempered to spring hardness (Vickers hardness HV 500 to 580).
10. In a fuel injection pump, an assembly substantially as hereinbefore described with reference to Figures 1 to 4, or Figure 5 or Figure 6 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782840180 DE2840180A1 (en) | 1978-09-15 | 1978-09-15 | SECURING DEVICE FOR PRESSURE VALVE HOLDERS OF FUEL INJECTION PUMPS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2031546A true GB2031546A (en) | 1980-04-23 |
| GB2031546B GB2031546B (en) | 1983-02-02 |
Family
ID=6049533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7932002A Expired GB2031546B (en) | 1978-09-15 | 1979-09-14 | Locking assembly for pressure valve retainers in fuel injection pumps |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS621414Y2 (en) |
| DE (1) | DE2840180A1 (en) |
| GB (1) | GB2031546B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2132301A (en) * | 1982-11-24 | 1984-07-04 | Gerald Charles Rickwood | Screw-action connectors security means |
| US4657457A (en) * | 1982-11-24 | 1987-04-14 | Rickwood Gerald C | Screw-action connectors security means |
| GB2229241A (en) * | 1989-03-17 | 1990-09-19 | Valerie Jean Elizabeth Marsden | Retainer for fixing device |
| GB2260177A (en) * | 1991-10-02 | 1993-04-07 | Michael John Green | Device for preventing undoing of nuts |
| GB2300890A (en) * | 1995-05-18 | 1996-11-20 | Rover Group | Locking device for screw-threaded fasteners |
| EP1795702A2 (en) * | 2005-12-07 | 2007-06-13 | Rolls-Royce plc | Balancing apparatus and method for rotor shaft flange |
| CN112682414A (en) * | 2020-11-20 | 2021-04-20 | 中国航发哈尔滨东安发动机有限公司 | Locking plate, locking structure and mounting method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57190851A (en) * | 1981-05-19 | 1982-11-24 | Asahi Chemical Ind | Panel attaching metal fitting |
| JPS5862712U (en) * | 1981-10-23 | 1983-04-27 | 日本軽金属株式会社 | Attachment structure of external materials to concrete frame |
| SE436334B (en) * | 1981-12-14 | 1984-12-03 | Rolf Olsson | WELDING OR SAFETY DEVICE FOR BULGAR UNITS |
| JPS6131564A (en) * | 1984-07-20 | 1986-02-14 | 株式会社竹中工務店 | Body finishing wall and its support apparatus |
| JPH0332166Y2 (en) * | 1985-01-19 | 1991-07-09 | ||
| JPH04203144A (en) * | 1990-11-30 | 1992-07-23 | Sekisui Chem Co Ltd | Fixing for outer wall panel |
-
1978
- 1978-09-15 DE DE19782840180 patent/DE2840180A1/en not_active Withdrawn
-
1979
- 1979-09-14 GB GB7932002A patent/GB2031546B/en not_active Expired
- 1979-09-14 JP JP12641879U patent/JPS621414Y2/ja not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2132301A (en) * | 1982-11-24 | 1984-07-04 | Gerald Charles Rickwood | Screw-action connectors security means |
| US4657457A (en) * | 1982-11-24 | 1987-04-14 | Rickwood Gerald C | Screw-action connectors security means |
| GB2229241A (en) * | 1989-03-17 | 1990-09-19 | Valerie Jean Elizabeth Marsden | Retainer for fixing device |
| GB2260177A (en) * | 1991-10-02 | 1993-04-07 | Michael John Green | Device for preventing undoing of nuts |
| GB2260177B (en) * | 1991-10-02 | 1995-02-15 | Michael John Green | Devices for restraining road wheel nuts from undoing |
| GB2300890A (en) * | 1995-05-18 | 1996-11-20 | Rover Group | Locking device for screw-threaded fasteners |
| GB2300890B (en) * | 1995-05-18 | 1998-05-20 | Rover Group | A locking device for a screw threaded fastener |
| EP1795702A2 (en) * | 2005-12-07 | 2007-06-13 | Rolls-Royce plc | Balancing apparatus and method for rotor shaft flange |
| EP1795702A3 (en) * | 2005-12-07 | 2009-04-29 | Rolls-Royce plc | Balancing apparatus and method for rotor shaft flange |
| CN112682414A (en) * | 2020-11-20 | 2021-04-20 | 中国航发哈尔滨东安发动机有限公司 | Locking plate, locking structure and mounting method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2031546B (en) | 1983-02-02 |
| DE2840180A1 (en) | 1980-03-27 |
| JPS621414Y2 (en) | 1987-01-13 |
| JPS5544092U (en) | 1980-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2031546A (en) | Locking assembly for pressure valve retainers in fuel injection pumps | |
| US7927052B1 (en) | Locking axle nut | |
| SK282812B6 (en) | Screw and wrench for snugly-fitted tightenings | |
| US4957403A (en) | Demountable pin for rotatably connecting together two elements of small axial dimension, particularly suitable for the lever mechanisms of textile machines | |
| EP0474773B1 (en) | An arrangement for locking a shaft to a machine member | |
| US4083288A (en) | Split nuts | |
| US3438416A (en) | Bolt assembly | |
| US4557652A (en) | Lockable nut | |
| US4505628A (en) | Bearing locknut | |
| CA1078222A (en) | Nut locking means | |
| US5360303A (en) | Device for locking a nut on a bolt | |
| US4118041A (en) | Seal structure | |
| US3461935A (en) | Resilient self-blocking nut | |
| US8365693B2 (en) | Single cam phaser camshaft | |
| JP2004500519A (en) | Fixing device | |
| US3508592A (en) | Sealed press nut having a spring retained floating nut element | |
| US3400956A (en) | Universally indexing lock means | |
| US8733518B1 (en) | Drive pin assembly | |
| US3253630A (en) | High speed lock washer | |
| EP0427030A2 (en) | Device for distributing fastening loads over adjacent mechanical parts | |
| US4515497A (en) | Clamping element for the releasable fastening of spatially arranged, or parallel bars, tubes and similar objects | |
| GB2047837A (en) | Threaded fasteners with flexible flanges | |
| GB2277570A (en) | Lock washer | |
| JPS58142061A (en) | Assembly of pilot-pressure ball screw with holding ring | |
| US4745892A (en) | Internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19990913 |