GB1592119A - Spring-force-controlled regulators particularly centrifugal governors for internal combustion engines - Google Patents

Spring-force-controlled regulators particularly centrifugal governors for internal combustion engines Download PDF

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Publication number
GB1592119A
GB1592119A GB2332378A GB2332378A GB1592119A GB 1592119 A GB1592119 A GB 1592119A GB 2332378 A GB2332378 A GB 2332378A GB 2332378 A GB2332378 A GB 2332378A GB 1592119 A GB1592119 A GB 1592119A
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United Kingdom
Prior art keywords
spring
regulating
springs
regulator
securing
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Expired
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GB2332378A
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Robert Bosch GmbH
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Robert Bosch GmbH
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1592119A publication Critical patent/GB1592119A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F02D1/04—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 mechanical means dependent on engine speed, e.g. using centrifugal governors
    • F02D1/045—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 mechanical means dependent on engine speed, e.g. using centrifugal governors characterised by arrangement of springs or weights

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Valve Device For Special Equipments (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO SPRING-FORCE-CONTROLLED REGULATORS PARTICULARLY CENTRIFUGAL GOVERNORS FOR INTERNAL COMBUSTION ENGINES (71) We, ROBERT BOSCH GMBH, a German company of Postfach 50, 7 Stuttgart 1, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to springforce-controlled regulators, particularly centrifugal governors for internal combustion engines.
The invention relates to a spring-forcecontrolled regulator, particularly a centrifugal governor for internal combustion engines, having at least one helical compression spring which is interposed between two abutments and which acts as a regulating spring, and an actuating member which transmits from one end of the spring regulating movements in the sense of variations of the length of the spring and which can-tilt about a transverse spindle arranged at right angles to the longitudinal axis of the spring.
Known centrifugal governors, fitted in speed governors for internal combustion engines (idling and maximum speed governors RQ manufactured by Robert Bosch GmbH., see publication VDT-UBP 210/1) always involve functional deficiencies such as unintentional adaptation, pre-regulation, sluggish transitions between the speed stages and speed drop, the reasons for these disadvantages hitherto being primarily dimensional and installation tolerances and play between the individual components and faulty adjustment. However, recent investigations have shown that the main cause of the shortcomings occurring in the governors is the eccentric application of force to the end of the spring in the case of a spring abutment which can tilt about a transverse axis disposed at right angles to the longitudinal axis of the spring.These disadvantages occur to an increased extent when the eccentric application of force by the regulating spring is directed transversely of the axis of the spring abutment.
When the regulating spring is fitted with no prestress, or with only a small amount of prestress, as in the case of a variable speed governor RQV manufactured by Robert Bosch GmbH., of Stuttgart, Germany, it can rotate during operation, so that that point on the end face of the corresponding end of the spring which transmits the largest component of the spring force to the abutment changes its position and thus causes a change in the maximum rotational speed (speed drop).
According to the present invention there is provided a spring-force-controlled regulator having at least one helical compression spring which is interposed between two abutments and which acts as a regulating spring, and an actuating member which transmits from one end of the spring regulat .ing movements in the sense of variations of the length of the spring and which can tilt about a transverse spindle arranged at right angles to the longitudinal axis of the spring, in which, in order to eliminate unintentional tilting movement of the actuating member caused by spring force acting eccentrically upon the spring abutments, the helical compression spring is specifically fitted in an installation position in which a point which is located on the end face of the corresponding end of the spring, and which transmits the largest component of the spring force to the spring abutment associated with the tiltable actuating member, lies substantially in a plane which extends parallel to the longitudinal axis of the spring and in which lies the axis of the transverse spindle.
A regulator embodying the present invention can have the advantage that it can eliminate unintentional tilting movements of the actuating member caused by the spring force acting eccentrically on the spring abut ments, since, as a result of the installation position, in accordance with the invention, of the helical compression spring, tilting movements of the actuating member no longer occur.
In the case of springs which are fitted without prestress, or with only a small amount of prestress, an unintentional change of position can be prevented when the installation position of the regulating springs is fixed by securing means between at least one end of the spring and the associated spring abutment, and when this spring abutment is in turn fitted so as to be at least secured against rotation.
In a regulator which is in the form of a centrifugal governor and which includes two symetrically arranged fly weights which act as actuating members and are hinged to transmission levers each by way of a transverse spindle and accommodate the regulating springs within a stepped central bore, one spring abutment being formed by a shoulder in the central bore or, in the form of a spring abutment plate, abuts thereagainst, and the other spring abutment comprising a spring abutment plate secured to a stay bolt, the installation position of the regulating springs is fixed in a particularly advantageous manner by securing means between at least one end of the spring and one of the spring abutment plates in turn secured or guided so as to be secure against rotation, or the shoulder in the central bore of the fly weights.
In a particularly advantageous manner, mechanical latch means and retaining means, such as a dog-like projection which engages a corresponding notch at the end of the spring, or metal adhesive, can act as the securing means. Alternatively, at least one end of the spring and/or one spring abutment is provided with a surface which increases the static friction. The two lastmentioned means do not impair the strength of the spring.
The invention will be further described, by way of example, with reference to the accompanying drawings in which: Fig. I is a longitudinal section through a centrifugal speed governor according to one embodiment of the invention, Fig. 2 is a section on the line II--II of Fig.
1, and Fig. 3 is a section on the line III--III of Fig. 2.
A centrifugal speed governor, shown in longitudinal section in Fig. I, has a housing 10, and a centrifugal governor 12 is secured to the drive shaft Il of an injection pump (otherwise not illustrated) for internal combustion engines. The centrifugal governor has two fly weights 13 which move away from the axis of the drive shaft II under centrifugal force against the force of regulating springs 14 and 14a, these regulating movements being transmitted to a governor sleeve 16 by way of bell-crank levers 15.An intermediate lever 19 in the form of a twoarm lever is coupled to the governor sleeve 16 by way of a slide block 17 and a pivot pin 18 thereof, one arm l9a of the two-arm lever being articulated to the governor sleeve 16, and the other lever arm 19b of the two-arm lever being articulated to a regulating rod 22 of the injection pump by way of a bar 21.
The intermediate lever 19 has a slotted guide 23 and a stud 24, acting as a pivot point, is slidable in the slotted guide and forms part of a guide lever 25 which is in turn rigidly connected by way of a lever shaft 26 to an adjusting lever 27 acting as an adjusting member.
The construction and mode of operation of this centrifugal speed governor operating as an idling and maximum speed governor are known and therefore only the centrifugal governor 12 constructed in accordance with the invention will be further described hereinafter. The bell-crank levers 15 acting as transmission levers are pivotally mounted on pivot pins 28 and are articulated to the governor sleeve 16 by means of a transverse pin 29, and a respective one of two bell-crank levers 15 is connected to the associated fly weight 13 by means of a bolt-shaped transverse spindle 31.
The centrifugal governor 12 is equipped with two fly weights 13 which are arranged symetrically of one another, the upper fly weight of which is shown in section and has a stepped central bore 32 whose shoulder 33 acts as an abutment for the outer regulating spring 14 which acts as an idling regulating spring and which is in the form of a helical compression spring. The external end 14e of the spring abuts against a spring abutment plate 36 which is guided on a stay bolt 34 so as to be non-rotatable relative thereto and which is secured by means of an annular nut 35. The spring abutment plate 36 acts as a second abutment for the idling regulating spring 14 and also for the inner maximum speed regulating spring 14a whose end facing the drive shaft II abuts against a second spring abutment plate 37 which in turn rests on a shoulder on the stay bolt 34 and, during regulating movements of the fly weight 13, is only carried along when the fly weight 13 has covered its idling stroke designated L.
The stay bolt 34 and the pivot pins 28 are secured to a fly weight carrier 38 which is secured to the drive shaft I 1 and in the central bore 39 of which is guided the governor sleeve 16. The fly weight 13 which is actuated by centrifugal force, and which therefore can also be referred to as the actuating member for the regulating spring, can tilt about the transverse spindle 31 and, in order to obtain satisfactory control, the bottom of its bore formed by the shoulder 33.
should be at right angles to the longitudinal axis of the stay 'boll 34 'particularly at the governing-down point reached after covering the idling stroke L. Tests have shown that the maximum spring force lies in the vicinity of the end of the spring in the case of the helical compression springs which are used in the present instance and which have shaped and ground ends, and, when this point which is designated P, in the case of the regulating spring 14, and which is designated P2 in the case of the regulating spring 14a, and which transmits the largest component of the spring force to the tiltable fly weights or the spring abutment plate 37, lies outside a plane which extends parallel to the longitudinal axis of the spring and in which lies the axis A of the transverse spindle 13, the governing-down point of the governor correspondingly changes, or the maximum speed governing commences slowly, that is the beginning of the governing-down curve has an arcuate shape. This error is further increased when, during operation, the corresponding point P, or P2 moves further outwardly away from the transverse spindle 31.
In order to eliminate errors of this kind, the regulating springs 14 and 14a are fitted such that, as is shown in Fig. 2, the points P, and P2 lie accurately on the transverse axes A of the fly weights 13, strictly speaking in a plane which extends through the transverse axes A and parallel to the longitudinal axis of the spring. Very greatly prestressed springs maintain their predetermined installation position even when the governor is operating. When the prestress is only slight, or the springs 14 and 14a are fitted without prestress, as is the case in, for example, variable speed governors, the springs 14 and 14a have to be maintained in their previously described installation position by securing means.In the case of the centrifugal speed governor shown as an embodiment in the drawings, it is sufficient when at least one end of each of the regulating springs 14 and 14a is secured by means of a metal adhesive (see 43 in Fig. 1), acting as a securing means, to the spring abutment plate 36 secured against rotation.
Alternatively, however, mechanical latch or retaining means can be used as securing means, such as, for example, an angled end of the spring inserted into a corresponding bore (not illustrated).
Figs. 2 and 3 show a mechanical latch means for the outer idling regulating spring 14 in the form of a dog-like projection 41 on the shoulder 33 in the fly weight 13. The doglike projection 41 engages a complementary notch 42 incorporated in the end 14b of the regulating spring 14 (see Fig. 3). Alternatively, as is indicated by a dash-dot line at 41' in Fig. 2, the dog-like projection can form a lateral stop for the extreme end 1 4d of the regulating-spring 14, and thus act as a means for securing the spring against rotation.
Alternatively, to ensure that the regulating springs 14, 14a maintain their fitted positions, in accordance with the invention, illustrated in Fig. 2, at least one end of each spring or a spring abutment plate can be provided with a surface which increases the static friction (not illustrated). When metal adhesive acts as securing means for the two regulating springs 14 and 14a, the metal adhesive is interposed between the spring abutment plate 36 and the associated end of the spring, for example 14c, as is indicated by the reference numeral 43. The spring abutment plate' 36 is secured against rotation by means or surfaces 44 formed on the stay bolt 34, so that the regulating springs 14 and 14a are fixed in their installation positions.In this arrangement, the dog-like projection 41 and the associated notch 42 acting as means for securing against rotation can be omitted, this being particularly advantageous in the case of thin springs which are highly stressed, since notch stresses caused by the notch 42 are avoided.
It is conceivable to use further current types of connection means, retaining means and latch means as securing means, although, in the present instance, the specific installation position of the regulating springs for avoiding a tilting moment on the fly weight 13 is considered to be essential to the invention. The invention can be applied to any other regulating or control device whose regulating spring co-operates with 9 tiltable actuating member.
WHAT WE CLAIM IS: 1. A spring-force-controlled regulator having at least one helical compression spring which is interposed between two abutments and which acts as a regulating spring, and an actuating member which transmits from one end of the spring regulating movements in the sense of variations of the length of the spring and which can tilt about a transverse spindle arranged at right angles to the longitudinal axis of the spring, in which, in order to eliminate unintentional tilting-movement of the actuating member caused by spring force acting eccentrically upon the spring abutments, the helical compression spring is specifically fitted in an installation position in which a point which is located on the end face of the corresponding end of the spring, and which transmits the largest component of the spring force to the spring abutment 'associated with the tiltable actuating member, lies substantially in a plane which extends parallel to the longitudinal axis of the spring and in which lies the axis of the transverse spindle.
2. A regulator as claimed in claim 1, in
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. bottom of its bore formed by the shoulder 33. should be at right angles to the longitudinal axis of the stay 'boll 34 'particularly at the governing-down point reached after covering the idling stroke L. Tests have shown that the maximum spring force lies in the vicinity of the end of the spring in the case of the helical compression springs which are used in the present instance and which have shaped and ground ends, and, when this point which is designated P, in the case of the regulating spring 14, and which is designated P2 in the case of the regulating spring 14a, and which transmits the largest component of the spring force to the tiltable fly weights or the spring abutment plate 37, lies outside a plane which extends parallel to the longitudinal axis of the spring and in which lies the axis A of the transverse spindle 13, the governing-down point of the governor correspondingly changes, or the maximum speed governing commences slowly, that is the beginning of the governing-down curve has an arcuate shape. This error is further increased when, during operation, the corresponding point P, or P2 moves further outwardly away from the transverse spindle 31. In order to eliminate errors of this kind, the regulating springs 14 and 14a are fitted such that, as is shown in Fig. 2, the points P, and P2 lie accurately on the transverse axes A of the fly weights 13, strictly speaking in a plane which extends through the transverse axes A and parallel to the longitudinal axis of the spring. Very greatly prestressed springs maintain their predetermined installation position even when the governor is operating. When the prestress is only slight, or the springs 14 and 14a are fitted without prestress, as is the case in, for example, variable speed governors, the springs 14 and 14a have to be maintained in their previously described installation position by securing means.In the case of the centrifugal speed governor shown as an embodiment in the drawings, it is sufficient when at least one end of each of the regulating springs 14 and 14a is secured by means of a metal adhesive (see 43 in Fig. 1), acting as a securing means, to the spring abutment plate 36 secured against rotation. Alternatively, however, mechanical latch or retaining means can be used as securing means, such as, for example, an angled end of the spring inserted into a corresponding bore (not illustrated). Figs. 2 and 3 show a mechanical latch means for the outer idling regulating spring 14 in the form of a dog-like projection 41 on the shoulder 33 in the fly weight 13. The doglike projection 41 engages a complementary notch 42 incorporated in the end 14b of the regulating spring 14 (see Fig. 3). Alternatively, as is indicated by a dash-dot line at 41' in Fig. 2, the dog-like projection can form a lateral stop for the extreme end 1 4d of the regulating-spring 14, and thus act as a means for securing the spring against rotation. Alternatively, to ensure that the regulating springs 14, 14a maintain their fitted positions, in accordance with the invention, illustrated in Fig. 2, at least one end of each spring or a spring abutment plate can be provided with a surface which increases the static friction (not illustrated). When metal adhesive acts as securing means for the two regulating springs 14 and 14a, the metal adhesive is interposed between the spring abutment plate 36 and the associated end of the spring, for example 14c, as is indicated by the reference numeral 43. The spring abutment plate' 36 is secured against rotation by means or surfaces 44 formed on the stay bolt 34, so that the regulating springs 14 and 14a are fixed in their installation positions.In this arrangement, the dog-like projection 41 and the associated notch 42 acting as means for securing against rotation can be omitted, this being particularly advantageous in the case of thin springs which are highly stressed, since notch stresses caused by the notch 42 are avoided. It is conceivable to use further current types of connection means, retaining means and latch means as securing means, although, in the present instance, the specific installation position of the regulating springs for avoiding a tilting moment on the fly weight 13 is considered to be essential to the invention. The invention can be applied to any other regulating or control device whose regulating spring co-operates with 9 tiltable actuating member. WHAT WE CLAIM IS:
1. A spring-force-controlled regulator having at least one helical compression spring which is interposed between two abutments and which acts as a regulating spring, and an actuating member which transmits from one end of the spring regulating movements in the sense of variations of the length of the spring and which can tilt about a transverse spindle arranged at right angles to the longitudinal axis of the spring, in which, in order to eliminate unintentional tilting-movement of the actuating member caused by spring force acting eccentrically upon the spring abutments, the helical compression spring is specifically fitted in an installation position in which a point which is located on the end face of the corresponding end of the spring, and which transmits the largest component of the spring force to the spring abutment 'associated with the tiltable actuating member, lies substantially in a plane which extends parallel to the longitudinal axis of the spring and in which lies the axis of the transverse spindle.
2. A regulator as claimed in claim 1, in
which the installation position of the regulating springs is fixed by securing means between at least one end of the springs and the associated spring abutment which is in turn secured in position so as to be at least secure against rotation.
3. A regulator as claimed in claim 1, which is in the form of a centrifugal governor and which includes two fly weights which are arranged symmetrically and which act as actuating members and are hinged to transmission levers each by way of a transverse spindle and which accommodate the regulating springs within a stepped central bore, one spring abutment in each case being formed by the shoulder in the central bore or is in the form of a spring abutment plate to abut thereagainst, and the other spring abutment comprises a spring abutment plate secured to a stay bolt, and in which the installation position of the regulating spring is fixed by securing means between at least one spring end and a spring abutment plate in turn secured or guided so as to be secured against rotation, or the shoulder in the central bore of the fly weights.
4. A regulator as claimed in claim 2 or 3, in which a metal adhesive acts as the securing means.
5. A regulator as claimed in claim 2 or 3, in which, for the purpose of securing in position, at least one spring end and/or spring abutment is provided with a surface increasing static friction.
6. A regulator as claimed in claim 2 or 3, in which mechanical latch means and/or retaining means act as securing means.
7. A regulator as claimed in claims 3 and 6, in which a dog-like projection formed preferably on the shoulder of the central bore in the fly weight acts as mechanical latch means.
8. A regulator as claimed in claim 7, in which the dog-like projection is arranged to engage a corresponding notch at the end of the regulating spring.
9. A regulator as claimed in claim 7, in which the dog-like projection acts as means for securing the extreme end of the spring, abutting laterally against the projection, against rotation.
10. A spring-force-controlled regulator constructed and arranged and adapted to operate substantially as hereinbefore particularly described with reference to and as illustrated in the accompanying drawings.
GB2332378A 1978-02-24 1978-05-26 Spring-force-controlled regulators particularly centrifugal governors for internal combustion engines Expired GB1592119A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782807926 DE2807926A1 (en) 1978-02-24 1978-02-24 SPRING-CONTROLLED REGULATING DEVICE, IN PARTICULAR CENTRIFUGAL FORCE CONTROLLER FOR COMBUSTION MACHINES

Publications (1)

Publication Number Publication Date
GB1592119A true GB1592119A (en) 1981-07-01

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Application Number Title Priority Date Filing Date
GB2332378A Expired GB1592119A (en) 1978-02-24 1978-05-26 Spring-force-controlled regulators particularly centrifugal governors for internal combustion engines

Country Status (4)

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JP (1) JPS54124120A (en)
DE (1) DE2807926A1 (en)
FR (1) FR2418335A1 (en)
GB (1) GB1592119A (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1206315B (en) * 1955-07-11 1965-12-02 Fritz Heinzmann Centrifugal governor
US2995936A (en) * 1956-10-17 1961-08-15 Heinzmann Fritz Variable speed-control device
US3955424A (en) * 1975-03-10 1976-05-11 Turbodyne Corporation Integral mechanical governor

Also Published As

Publication number Publication date
DE2807926A1 (en) 1979-09-06
FR2418335B3 (en) 1981-11-27
JPS54124120A (en) 1979-09-26
DE2807926C2 (en) 1987-01-15
JPS6132486B2 (en) 1986-07-28
FR2418335A1 (en) 1979-09-21

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Legal Events

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940526