CN205422858U

CN205422858U - Vvl camshaft structure

Info

Publication number: CN205422858U
Application number: CN201620208188.3U
Authority: CN
Inventors: 秦天
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-03-17
Filing date: 2016-03-17
Publication date: 2016-08-03
Anticipated expiration: 2026-03-17

Abstract

The utility model discloses a VVL camshaft structure, especially a VVL camshaft structure who is used for the automobile engine field. The utility model provides a can avoid the engine in high speed operation state and the in -process production impact of switching each other of low -speed operating condition, can effectively protect the camshaft part, can prolong machine part life greatly to show the reduction machining degree of difficulty, is carrying high yield's VVL camshaft structure, including dabber and cam pack, the cam pack cover is established at the spindle, still includes the edge cam, two end face contaction of edge cam and cam pack still be provided with the radial cams structure on the edge cam. This application is adopted the edge cam to come the relative dabber of driving cam subassembly to move and can be realized high low -speed operating mode and steadily change, makes the high low -speed cam quick in the conversion process, accurate and assault for a short time, has reduced the conversion of high low -speed to machine part's harm, has improved the durability of VVL camshaft, has lengthened life.

Description

VVL camshaft structure

Technical field

This utility model relates to a kind of VVL camshaft structure, a kind of VVL camshaft structure for automotive engine applications.

Background technology

The port timing mechanism of electromotor is responsible for providing gasoline combustion acting necessary fresh air to cylinder, and the waste gas after burning is discharged, from operation principle, the major function of port timing mechanism is to open and close the inlet and outlet door of each cylinder according to certain time limit, thus realizes the whole process of cylinder ventilation supply.For there is no the common engine of changeable air valve technology, intake and exhaust opening/closing time and lift are all fixing, the port timing of electromotor can not change according to the rotating speed of electromotor, the very difficult job demand with respect to electromotor when different rotating speeds operating mode of this changeless valve stroke.Therefore to meet the job requirement of electromotor full working scope it is necessary to design changeable air valve, promote the power performance of electromotor, make burning more efficiently.For solving foregoing problems, the i.e. changeable air valve lift technology of VVL technology is arisen at the historic moment.VVL technology can mate suitable valve stroke when electromotor different rotating speeds, different load so that electromotor uses less valve stroke when the slow-speed of revolution, Smaller load, improves cold start-up and reduces oil consumption.Use bigger valve stroke when high rotating speed, big load, reduce valve throttling loss, improve charging efficiency, improve the electromotor power output when high rotating speed, big load and the fuel oil consumption of electromotor can be reduced, improving fuel economy, reduce the discharge of HC, NOx.

Lift range variable technology is to utilize the cam of two kinds of different molded line to control the electromotor valve stroke when high speed operation state and tick-over state respectively in the prior art, such as the camshaft structure used in patent documentation " two-stage is adjustable variable gas distribution " publication number CN201220616883, this patented technology is cased with cam sleeve outside camshaft, camshaft is connected with cam sleeve two ends spline, and stop collar is enclosed within outside cam sleeve；Lower speed cam is fixing with High speed cam to be connected and connects as one with cam sleeve, and the two ends of cam sleeve arrange oppositely oriented spiral grooves, and groove push rod is placed in spiral grooves, and control to switch Lower speed cam High speed cam by electromagnetic actuator.Above technology uses groove push rod and spiral grooves to realize the switching of High speed cam and Lower speed cam, the impact of its handoff procedure is bigger, at the end of handoff procedure, its speed and acceleration are all not zero, need to block push rod by groove trough rim, and VVL camshaft structure belongs to precise part, processing cost is high, and it is easily damaged in impact process.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of simple in construction; electromotor can be avoided to produce impact during high speed operation state and tick-over state mutually switch; can effectively protect camshaft parts, the VVL camshaft structure in machine components service life can be greatly prolonged.

This utility model solves the VVL camshaft structure that its technical problem is used, including mandrel and cam pack, described cam pack is set on mandrel, hole, location it is provided with on described mandrel, described cam pack includes high low speed cam set and axle journal, often organize high low speed cam set to be made up of a High speed cam and a Lower speed cam, two groups of height low speed cam set match, described axle journal is between with a pair height speed cam set, also include locating slot, described locating slot is arranged on the both sides of cam pack, described locating slot is made up of high speed locating slot and low speed locating slot, described location is provided with elastic component in hole, the two ends of elastic component are provided with steel ball, when electromotor is in high speed operation state, the steel ball part at elastic component two ends is positioned in high speed locating slot, another part is positioned in hole, location；When electromotor is in tick-over state, the steel ball part at elastic component two ends is positioned in low speed locating slot, and another part is positioned in hole, location, also includes that extremity piece, described extremity piece are arranged on the both sides of cam pack.

Further, described extremity piece being additionally provided with radial cams, described axial end cam and radial cams are compounded on extremity piece.

Further, the rate curve of described axial end cam is connected in sequence by the initial segment, accelerating sections, high speed changeover portion, braking section and ending segment, and the speed at the end of axial end cam lift and acceleration equal zero.

Further, speed and acceleration at the end of described radial cams lift are zero.

Further, described cam pack includes that two to high low speed cam set, described two are provided with spacer between high low speed cam set.

Further, also including intermediate pin, two the axial end cams being positioned at two groups of adjacent sides of cam pack are driven by the intermediate pin contacted with two, this side axial end cam simultaneously.

Further, described intermediate pin is flat pin.

Further, described intermediate pin is elliptic pin.

Further, described intermediate pin is double-pin.

Further, the detection device for detecting intermediate pin radial position is also included.

The beneficial effects of the utility model are: the application uses edge cam to drive cam pack to move relative to mandrel, owing to the shape of edge cam can be designed according to the requirement that cam pack moves axially, make it that cam pack can be driven to axially move according to the characteristics of motion that satisfied impact is little, therefore the application camshaft structure can realize high speed operation smooth conversion, make high Lower speed cam quick in transformation process, accurately and impact little, significantly reduce the high low speed conversion infringement to machine components, substantially increase the ruggedness of VVL camshaft, extend its service life.

Accompanying drawing explanation

Fig. 1 is the lifting curve figure of edge cam；

Fig. 2 is the speed curve diagram of edge cam；

Fig. 3 is the acceleration plots of edge cam；

Fig. 4 is the lifting curve figure of radial cams；

Fig. 5 is the speed curve diagram of radial cams；

Fig. 6 is the acceleration plots of radial cams；

Fig. 7 be this utility model cam pack be the structural representation of Split type structure；

Fig. 8 is the structural representation that this utility model uses two one group of form of cylinder；

Parts, position and numbering in figure: mandrel 1, axle journal 2, high low speed cam set 3, High speed cam 4, Lower speed cam 5, location hole 6, high speed locating slot 8, low speed locating slot 9, steel ball 10, elastic component 11, extremity piece 12, spacer 14, the initial segment 15, accelerating sections 16, high speed changeover portion 17, braking section 18, ending segment 19.

Detailed description of the invention

The utility model is described in further detail below in conjunction with the accompanying drawings.

nullEmbodiment 1: as shown in Figure 7，VVL camshaft structure in the present embodiment，Including mandrel 1 and cam pack，Cam pack is set on mandrel 1，Hole 6, location it is provided with on described mandrel 1，Described cam pack includes high low speed cam set 3 and axle journal 2，Often organize high low speed cam set 3 to be made up of a High speed cam 4 and a Lower speed cam 5，Two groups of height low speed cam set 3 match，Described axle journal 2 is between with a pair height speed cam set 3，Also include locating slot，Described locating slot is arranged on the both sides of cam pack，Described locating slot is made up of high speed locating slot 8 and low speed locating slot 9，Hole, described location 6 is provided with elastic component 11，The two ends of elastic component 11 are provided with steel ball 10，When electromotor is in high speed operation state，Steel ball 10 part at elastic component 11 two ends is positioned in high speed locating slot 8，Another part is positioned in hole 6, location；When electromotor is in tick-over state, steel ball 10 part at elastic component 11 two ends is positioned in low speed locating slot 9, and another part is positioned in hole 6, location, also includes that extremity piece 12, described extremity piece 12 are arranged on the both sides of cam pack.When electromotor needs conversion between high speed operation state and tick-over state, solenoid-driven push rod or pin enter into and the position of axial end cam contact, now axial end cam push rod in rotation process promotes axial edge cam to move axially as requested, axial end cam drives cam pack to move axially again, to realize the switching of high low speed duty.Owing to the shape of edge cam is determined by its lifting curve, and lifting curve also determines the movement law of cam pack, therefore can design the shape of edge cam according to the requirement that cam pack moves.The application is conducive to cam pack steadily to move in handoff procedure after using edge cam transmission, effectively prevent it and impacts engine component.

Embodiment 2: in the present embodiment, it is additionally provided with radial cams on described extremity piece 12, described axial end cam and radial cams are compounded on extremity piece 12, being arranged on the radial cams on extremity piece 12 and can make the push rod by solenoid-driven or pin steadily turnover extremity piece 12, the extremity piece 12 of this example can use the mode of powder metallurgy to manufacture.

Embodiment 3: use the lifting curve of preferred axial end cam to improve stationarity when camshaft duty switches further in the present embodiment.

As in figure 2 it is shown, the rate curve of axial end cam is connected in sequence by the initial segment 15, accelerating sections 16, high speed changeover portion 17, braking section 18 and ending segment 19, and the speed at the end of axial end cam lift and acceleration equal zero.Using aforementioned rate curve to divide can make cam pack first accelerate to certain speed gently when lift starts in the initial segment 15, the speed that fast speed increases further is added after entering accelerating sections 16, when speed advances into high speed changeover portion 17 close to peak value, the speed of reducing speed change in high speed changeover portion 17, make cam pack speed by accelerating to deceleration smooth transition, the speed that fast speed reduces is added after entering braking section 18, it is made after being comparatively fast reduced to the speed set, to enter ending segment 19, at the speed that ending segment 19 reducing speed reduces, its speed is made steadily to be decreased to zero.Corresponding lifting curve and accelerating curve are as shown in figures 1 and 3.

As further improving, more smoothly passing in and out extremity piece 12 to make push rod steadily pass in and out extremity piece 12, speed and acceleration at the end of radial cams lift are zero.Can use the cam lifting curve shown in Fig. 4 when being embodied as, corresponding rate curve and accelerating curve are as shown in Figure 5 and Figure 6.

Embodiment 4: as shown in Figure 8, in the present embodiment, cam pack includes that two to high low speed cam set 3, two are provided with spacer 14 between high low speed cam set 3.Due to a cylinder of the corresponding electromotor of high a pair low speed cam set 3, the present embodiment using two to high low speed cam set 3 as one group, two cylinders of electromotor the most corresponding therewith form the form of one group of both one group of two cylinder.Two to high low speed cam set 3 between spacer 14 is set, eliminate embodiment 1 as shown in Figure 1 two to the edge cam between high low speed cam set 3, also save the electromagnetic valve at this and push rod simultaneously, make electromagnetic valve be reduced to original four by original eight.

Embodiment 5: the most also include intermediate pin, two the axial end cams being positioned at two groups of adjacent sides of cam pack are driven by the intermediate pin contacted with two, this side axial end cam simultaneously.The present embodiment improves on the basis of embodiment 4 further, two the axial end cams employings being positioned at two groups of cam pack adjacents are promoted by the pin of same solenoid-driven, can reduce the most again by an electromagnetic valve, as shown in Figure 8, from the point of view of electromotor for four cylinders, corresponding two groups of cam packs on its VVL camshaft structure, i.e. four to high low speed cam set 3, if using the structure in embodiment 1 to need eight electromagnetic valves, and the present embodiment having only to three electromagnetic valves.

Embodiment 6: use flat pin to simultaneously drive two axial end cams in centre position in the present embodiment.Make the two ends of flat pin simultaneously with two axial end cam contact.

Embodiment: 7: using described pin in the present embodiment is elliptic pin, simultaneously drives two axial end cams in centre position.

Embodiment 8: use the structure of double-pin to realize with an electromagnetic valve in the present embodiment and simultaneously drive middle two axial end cams.

Embodiment 9: add the detection device for detecting intermediate pin radial position in the present embodiment.The present embodiment only checks intermediate pin radial position, it is not necessary to check the position of both sides pin, judges whether intermediate pin enters correctly into or exit extremity piece 12 by the detection putting middle pins position.

Claims

null1.VVL camshaft structure，Including mandrel (1) and cam pack，Described cam pack is set on mandrel (1)，It is characterized in that: on described mandrel (1), be provided with hole, location (6)，Described cam pack includes high low speed cam set (3) and axle journal (2)，Often organize high low speed cam set (3) to be made up of a High speed cam (4) and a Lower speed cam (5)，Two groups of height low speed cam set (3) match，Between described axle journal (2) is positioned at a pair height speed cam set (3)，Also include locating slot，Described locating slot is arranged on the both sides of cam pack，Described locating slot is made up of high speed locating slot (8) and low speed locating slot (9)，Hole, described location (6) is provided with elastic component (11)，The two ends of elastic component (11) are provided with steel ball (10)，When electromotor is in high speed operation state，Steel ball (10) part at elastic component (11) two ends is positioned in high speed locating slot (8)，Another part is positioned in hole, location (6)；When electromotor is in tick-over state, steel ball (10) part at elastic component (11) two ends is positioned in low speed locating slot (9), another part is positioned in hole, location (6), also include extremity piece (12), described extremity piece (12) is arranged on the both sides of cam pack, and described extremity piece is provided with axial end cam on (12).
2. VVL camshaft structure as claimed in claim 1, it is characterised in that: being additionally provided with radial cams on described extremity piece (12), described axial end cam and radial cams are compounded on extremity piece (12).
3. VVL camshaft structure as claimed in claim 1, it is characterized in that: the rate curve of described axial end cam is connected in sequence by the initial segment (15), accelerating sections (16), high speed changeover portion (17), braking section (18) and ending segment (19), and the speed at the end of axial end cam lift and acceleration equal zero.
4. VVL camshaft structure as claimed in claim 2, it is characterised in that: speed and acceleration at the end of the lift of described radial cams are zero.
5. VVL camshaft structure as claimed in claim 1, it is characterised in that: described cam pack includes that two to high low speed cam set (3), described two are provided with spacer (14) between high low speed cam set (3).
6. VVL camshaft structure as claimed in claim 5, it is characterised in that: also including intermediate pin, two the axial end cams being positioned at two groups of adjacent sides of cam pack are driven by the intermediate pin contacted with two, this side axial end cam simultaneously.
7. VVL camshaft structure as claimed in claim 6, it is characterised in that: described intermediate pin is flat pin.
8. VVL camshaft structure as claimed in claim 6, it is characterised in that: described intermediate pin is elliptic pin.
9. VVL camshaft structure as claimed in claim 6, it is characterised in that: described intermediate pin is double-pin.
10. VVL camshaft structure as claimed in claim 6, it is characterised in that: also include the detection device for detecting intermediate pin radial position.