CN2499588Y - MIddle pivot point pressure spring type speed changer - Google Patents

Abstract

The utility model relates to a speed regulator for diesel engine, in particular to a mechanical speed regulator with a negative correction speed regulator support, which is applied to a high speed direct injection type diesel engine. The utility model comprises a supporting axle which is arranged inside the shell of a speed regulator, a speed regulation spring and an idle speed spring, a flyweight and a flyweight base are connected with the end which is that a camshaft is extended into the shell through a slide bushing, a tension rod is connected with the supporting axle. The utility model is characterized in that a parking rocker arm is connected with the supporting axle. The utility model has the advantages that: speed stability is excellent, negative correction travel schedule and pretightening force of negative correction spring can be regulated alone without interference each other.

Description

Central bearing point pressure spring type speed regulator

The utility model is a kind of speed regulator of use for diesel engine, particularly a kind of mechanical governor with negative correction speed-regulating rack that is applicable to high speed direct jet diesel engine.

Existing central bearing point mechanical governor has the tension spring type speed regulator that adopts on Japanese Yanmar Diesel Engine Co. Ltd. CL Injection Pump and the domestic BQ Injection Pump, characteristics are to rely on the working angle that changes spring force to obtain different spring equivalent stiffness, requirement with simultaneous adaptation high speed and low speed, shortcoming is to select the rigidity of high speed spring and idle spring respectively, to obtain best match parameter.Existing all mechanical governors all have the stop mechanism of independently being made up of parts such as shutdown handle, parking rocking arm and parking rotating shafts, on governor housing, must process the hole that the parking rotating shaft is installed, and take seal approach, such structure is consuming cost both, takes up space again.

Relevant with the utility model in the prior art is the Chinese patent 87 2 16146 diesel engine centrifugal speed governor negative correction devices of Wuxi Inst. of Oil Pump and Oil Nozzle, Ministry of Machine-Building Industry's application.In the described negative correction device of this patent, the motion fulcrum of its speed control rod is directly driven by sliding sleeve, there is not the pin of deceleration, and the motion pivot distance is too near as the lower support axle of fixed support, the stroke of motion fulcrum is zoomed into the oil pump rod stroke significantly, these two factors make the negative correction lever ratio too big, and the minor variations of sliding sleeve stroke can cause the bigger variation of ratch stroke.Be difficult to cause the Engine torque or the fluctuation of speed on the other hand easily on the one hand to accurately adjusting with regard to very little negative correction ratch stroke originally.Another shortcoming of this patent is that the adjustment of negative correction stroke and the adjustment of negative correction initial tension of spring interfere with each other.When adjusting the negative correction stroke, the negative correction initial tension of spring also is changed, and causes that the effect rotary speed area of negative correction stroke changes.When adjusting the negative correction initial tension of spring, the negative correction stroke adjustmenting screw must be split out, the negative correction stroke must be readjusted then.

The purpose of this utility model provides a kind of new have the negative correction speed-regulating rack and the central bearing point pressure spring type speed regulator of idle spring independently.The negative correction lever ratio of speed regulator is less, and negative correction stroke and negative correction initial tension of spring can be adjusted mutual noninterference separately.Independently idle spring can satisfy the requirement of diesel engine low-speed stability.

Its main technical schemes comprises supporting axle, governor spring and the idle spring that is installed in the governor housing, and the end connection in camshaft stretches into housing flies piece and flies block, connects tension rail on supporting axle, it is characterized in that connecting on supporting axle the parking rocking arm.Utilize that supporting axle is double does the parking rotating shaft, pull shutdown handle and can drive the parking rocking arm, push rob support and pull bar to cut-out position by supporting axle.

The negative correction speed-regulating rack is installed in housing, in this negative correction speed-regulating rack, the middle part of rolling wheel support is hinged on the supporting axle, and the rob support utilization is slowed down and sold hinged with rolling wheel support, roller pin is arranged on rolling wheel support, rob support is enclosed within on supporting axle and the roller pin, and, at its fit position bigger gap is arranged, roller is arranged on roller pin, the upper end of rob support is connected with the pull bar of regulating the Injection Pump fuel delivery, and there is the lower support axle lower end, and reduction torsion spring is sleeved on the lower support axle.

Governor spring and idle spring parallel connection are sleeved on the guide finger that is installed on the housing, between governor spring and spring seat, have one when speed-regulating handle is in little throttle position, make governor spring be in the gap of free state.When speed-regulating handle unclamped, spring seat was only pushed down idle spring, and during the speed-regulating handle tension, spring seat is pushed down governor spring and idle spring simultaneously.

Governor spring and idle spring all adopt stage clip.Negative correction total kilometres adjusting screw is housed on the tension rail.

The advantage that the utility model is compared with prior art had is that this new central bearing point pressure spring type mechanical governor has independently idle spring, can obtain better low-speed stability; Supporting axle double as parking rotating shaft, escapable cost and space; The negative correction lever ratio is less, helps the stability of negative correction section and adjusts precision, and negative correction stroke and negative correction initial tension of spring can be adjusted mutual noninterference separately.

Fig. 1 longitudinal section of the present utility model.

Fig. 2 is the A-A sectional view of Fig. 1.

Fig. 3 is a negative correction speed-regulating rack component drawings.

Fig. 4 is the governor control characteristics figure that draw rod positions X changes with rotational speed N.

Further specify the utility model embodiment's structure and working principle below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2: be sleeved on the cam of injection pump axle by flying block 1 and fly the block part that flies that piece 2 forms, tension rail 11, parking rocking arm 29 and the negative correction speed-regulating rack of being made up of parts such as rob support 24 and rolling wheel supports 23 are hinged on the governor housing 9 by supporting axle 21.Governor spring 7 and idle spring 8 parallel connections, one headgear is contained on the common guide finger 4, tension rail 11 is withstood in the other end, when speed-regulating handle 28 unclamps, 5 of spring seats are pushed down idle spring 8, gapped K between governor spring 7 and the spring seat 5, during speed-regulating handle 28 tensions, spring seat 5 is pushed down governor spring 7 and idle spring 8 simultaneously.Balancing each other by tension rail 11 and the centrifugal force that flies piece 2 with joint efforts of governor spring 7 and idle spring 8.The negative correction speed-regulating rack is made up of rob support 24 and rolling wheel support 23, roller 13, roller pin 22, the parts such as pin 12, lower support axle 26, reduction torsion spring 25 that slow down, rob support 24 and rolling wheel support 23 are hinged by the pin 12 that slows down, patent 87 2 16146 diesel engine centrifugal speed governor negative correction devices do not have above-mentioned deceleration pin 12, but are hinged on the lower support axle 26.Rolling wheel support 23 is hinged on the supporting axle 21, between rob support 24 and supporting axle 21 and the roller pin 22 bigger gap is arranged, and sees Fig. 2, so two stands can relatively rotate around the pin 12 that slows down within the specific limits.Rob support 24 upper ends are connected with the pull bar 6 of regulating the Injection Pump fuel delivery, and lower support axle 26 is equipped with in the lower end.Returnning spring 25 is sleeved on the lower support axle 26, and pin inserts in the hole of rob support 24 lower ends, and the another pin pins rolling wheel support 23, keeps between rob support 24 and the rolling wheel support 23 elastic force in relative rotation.Adjusting screw 18 is equipped with in the bottom of tension rail 11, can regulate negative correction total kilometres X1, see Fig. 4, pairing sliding sleeve stroke S1, see Fig. 3, the middle part is equipped with by negative correction swivel nut 14, negative correction push rod 15, pretightening force and is adjusted the negative correction device parts that screw rod 16 and negative correction spring 17 etc. are formed.Pretightening force is adjusted the pretightening force that screw rod 16 is used to adjust negative correction spring 17, thereby changes the rotating speed that E is ordered among Fig. 3.Change the negative correction spring of different-stiffness, can change the slope of E-F section among Fig. 3.Be screwed into or the negative correction swivel nut 14 of back-outing can be adjusted negative correction effective travel X2, see Fig. 4, pairing sliding sleeve stroke S2 sees Fig. 3.

Speed regulator described in the utility model can be used for the diesel engine in-line fuel injection pump, and fuel injection camshaft drives and flies block 1 and fly piece 2 to rotate together.During starting, under the effect of primer spring 19 thrusts, sliding sleeve 20 will fly piece 2 and be pressed in the position that closes up fully, and pull bar 6 is positioned at maximum oil mass position, the A point among Fig. 4.Starting back rotating speed rises among Fig. 4 behind the pairing rotating speed of A point, the thrust that flies piece 2 overcomes the thrust of primer spring 19, and promote rolling wheel supports 23 and rob support 24 together to counterclockwise rotating through roller pin 22 by sliding sleeve 20, roller 13, contact with adjusting screw 18 up to lower support axle 26.At this moment pull bar 6 moves to the position that B is ordered among Fig. 4, and the gap between roller 13 and the tension rail 11 is S1.

If speed-regulating handle 28 unclamps at idle position, gapped K between spring seat 5 and the governor spring 7, governor spring 7 is inoperative, 11 of tension rails are subjected to the less thrust of idle spring 8, rotating speed rises to the rotating speed of idling point L correspondence among Fig. 4, and the thrust that flies 2 pairs of tension rails 11 of piece has surpassed the thrust of idle spring 8, and tension rail 11 leaves positive correction device 10 to counterclockwise rotating, rolling wheel support 23 and rob support 24 also rotate together, and pull bar moves to the idle position that L is ordered among Fig. 4.It is very little with the amplitude that the change of rotating speed changes to fly piece power under this rotating speed, but because idle spring rigidity is also less, can produce enough rod strokes with change in rotational speed changes, the slope of speed regulation characteristic L-M that is idling among Fig. 4 is close substantially with at a high speed speed regulation characteristic I-J, to keep stabilization of speed.

If speed-regulating handle 28 is tightened to calibration position, spring seat 5 is pushed down governor spring 7 and idle spring 8 simultaneously, and when rotating speed was lower than the rated engine speed that the L point is corresponding among Fig. 4, tension rail 11 leaned against on the corrector 10 all the time.After rotating speed rose to the C point, the thrust of flyball 2 surpassed the pretightening force of reduction torsion spring 25, and roller 13 drives the pin 12 of slowing down by roller pin 22 and rolling wheel support 23 and rotates counterclockwise around supporting axle 21, and the movement travel of the pin 12 that slows down is less than the movement travel of roller pin 22.Lower support axle 26 was conditioned screw 18 and withstood and can not move this moment, rob support 24 clockwise rotates around lower support axle 26 under the drive of the pin 12 that slows down, and drive pull bar 6 and move to the direction that strengthens fuel delivery, run into until roller 13 till the end face of negative correction push rod 15.At this moment pull bar 6 is parked on the position that D orders, and the gap between roller 13 and the tension rail 11 is S2.

After rotating speed rises to the E point, the thrust of flyball 2 surpasses the pretightening force of negative correction spring 17, roller 13 promotes negative correction push rod 15 to the right, and the motion of all parts on the negative correction speed-regulating rack parts is identical with the C-D section, and at this moment pull bar 6 moves to strengthening the fuel delivery direction again.Run into tension rail 11 until roller 13, the position of pull bar 6 arrives the F point.

At negative correction section C-D-E-F, because rob support 24 is not that to resemble patent 87 2 16146 diesel engine centrifugal speed governor negative correction devices direct by roller 13 (being sphere T type pin in the patent 87 216146) drive around the rotation of lower support axle 26, but drive by the deceleration pin 12 of movement travel less than the roller movement travel, again because the pin 12 that slows down arrives the distance of lower support axle 26 greater than roller 13 to the distance of lower support axle 26, rob support 24 is reduced significantly around the rotation angle of lower support axle 26, therefore the ratio of rod stroke X and sliding sleeve stroke S, promptly the negative correction lever ratio is significantly smaller than the negative correction lever ratio of patent 87 2 16146.

Claims (5)

1. central bearing point pressure spring type speed regulator, comprise the supporting axle (21), the governor spring (7) and idle spring (8) that are installed in the governor housing (9), end connection in camshaft stretches into housing (9) flies piece (2) and flies block (1), go up connection tension rail (11) at supporting axle (21), it is characterized in that going up connection parking rocking arm (29) at supporting axle (21).

2. speed regulator according to claim 1, it is characterized in that in housing (9), the negative correction speed-regulating rack being installed, in this negative correction speed-regulating rack, the middle part of rolling wheel support (23) is hinged on the supporting axle (21), rob support (24) utilizes deceleration pin (12) and rolling wheel support (23) hinged, roller pin (22) is arranged on rolling wheel support (23), rob support (24) is enclosed within on supporting axle (21) and the roller pin (22), and, at its fit position bigger gap is arranged, roller (13) is arranged on roller pin (22), the upper end of rob support (24) is connected with the pull bar (6) of regulating the Injection Pump fuel delivery, there is lower support axle (26) lower end, and reduction torsion spring (25) is sleeved on the lower support axle (26).

3. speed regulator according to claim 1, it is characterized in that governor spring (7) and idle spring (8) parallel connection are sleeved on the guide finger (4) that is installed on the housing (9), between governor spring (7) and spring seat (5), have one at speed-regulating handle (27) when being in little throttle position, make governor spring (7) be in the gap of free state.

4. speed regulator according to claim 1 is characterized in that governor spring (7) and idle spring (8) all adopt stage clip.

5. speed regulator according to claim 1 is characterized in that being equipped with on the tension rail (11) negative correction total kilometres adjusting screw (18).

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