CN100460672C

CN100460672C - Pump system for conveying lubricating oil

Info

Publication number: CN100460672C
Application number: CNB2004100556714A
Authority: CN
Inventors: B·迪尔
Original assignee: Andreas Stihl AG and Co KG
Current assignee: Andreas Stihl AG and Co KG
Priority date: 2003-08-01
Filing date: 2004-08-02
Publication date: 2009-02-11
Anticipated expiration: 2024-08-02
Also published as: DE102004036555A1; US20050025636A1; CN1580552A

Abstract

A pump system for conveying lubricating oil to a cutting chain of a chain saw is provided. The pump system comprises at least one first oil pump, wherein a quantity of oil being conveyed thereby is adjustable by an operator of the chain saw.

Description

Carry the pumping system of lubricant oil

Technical field

The present invention relates to a kind of lubricant oil is transported to a pumping system on the chain saw cutting chain.

Background technique

Chain saw has a guide rail, and the cutting chain with single chain link leads on its annular edge.The load that the hinged place of chain link and cutting teeth bear when work is very big.For fear of excessive wearing and tearing with improve cutting effect, carry lubricant oil to cutting chain by pumping system.

According to processed cut substrate, determine the quantity delivered of oil.When the timber type of cutting is different, for reaching the amount difference of the good required conveying lubricant oil of cutting effect.To this, known pumping system has the adjustable oil pump of user, and the operator of chain saw regulates the quantity delivered of lubricant oil according to the cut substrate of processing.

The fact shows that the quantity delivered of oil pump depends on oil viscosity, but can change in operating process.Because ectocine such as weather or because the short time of drive motor operating temperature raises are heated lubricant oil, cause its viscosity obviously to reduce.Need significantly fluctuate by the quantity delivered that readjusts oil pump compensation and may bring thereupon by operator.To compensate the fluctuation of quantity delivered when more changing oil kind equally.

The fact shows that the quantity delivered relevant with viscosity can be subjected to the moving influence of unexpected high-amplitude wave.Under operating temperature, seek thereby can to cause behind long-time interruption of work lubricant oil to cool off the initial delivery oil mass near best conveying oil mass at least too small.This may produce the galling of crossing to cutting chain.Carry oil mass too hour its cutting effect be not satisfied.

Summary of the invention

The technical problem to be solved in the present invention is to improve such pumping system, to guarantee under big operating range the cutting chain proper lubrication.

The technical problem to be solved in the present invention is transported to a pumping system solution on the chain saw cutting chain by a kind of with lubricant oil, this pumping system comprises the oil pump of the adjustable quantity delivered of at least one user, wherein oil pump is a reciprocating pump, it has the piston piece that rotatably drives around a rotation axis around its longitudinal axis, on piston piece, be provided with the skewed slot of annular, control pin rodent on being axially fixed in housing is gone in this skewed slot, wherein said control pin is diametrically opposed removable in described rotation axis, wherein said skewed slot distributes by being parallel to each other in the axial direction and cell wall that tilt with respect to the vertical line perpendicular to described rotation axis limits, and an end in the face of described piston piece of wherein said control pin is engaged between the described cell wall.

This is provided a kind of pumping system, one of them basic oil pump is in parallel with at least one adjustable oil pump.This basis oil pump is carried a basic oil mass, and this oil mass guarantees cutting chain to be carried out basic lubricant oil supply when big relatively with oil body under low operating temperature.As required, can carry additional oil mass to cutting chain by the oil pump of the adjustable parallel connection of user.Basic supply by basic oil pump can not be affected like this.Because the mistake of adjustable oil pump is regulated or the change of environmental conditions can not cause the lubricant oil undersupply.

Preferably, basic oil pump also is adjustable.For example, can make basic output rating and the timber kind of determining or definite lubricant oil type be complementary by regulating basic oil pump, and for example cause the variation of the operating parameter that viscosity fluctuation brings by adjustable oil pump compensation owing to temperature influence.In a favourable improvement, the quantity delivered furnishing of basic oil pump is fixing, thereby avoids that the user is wrong unintentionally regulates.

Preferably, the maximum output rating of adjustable oil pump little than basic oil pump.Avoid the mistake of pumping system to regulate by less regulation range.

In an advantageous embodiment, oil pump is a reciprocating pump, has the piston piece around the rotatable driving of its longitudinal axis, has annular skewed slot on piston piece, goes into wherein at the control pin rodent that is axially fixed on the housing for one.Piston piece is produced the very little vibration axial motion of machinery consumption by rotation driving continuously by control pin and skewed slot.This pump structure is simple, mechanical wear is little, long service life.

In a preferred construction, each piston of two oil pumps is fixed on the common piston piece and particularly is integral with piston piece.Only need a corresponding piston part to drive two pistons.This pump structural member as a whole is compact and simple.Two pumps only need a driver.Preferably, lead in the diameter of piston difference and the respective steps shape cylindrical hole in particularly integrally formed pump case.Different piston diameters can make the output rating difference of two pumps, and wherein the small piston diameter of adjustable oil pump reduces maximum delivery in desirable mode.For stepped cylindrical hole, the sealing guide piston of minor diameter also plays the seal action of big piston place cylindrical cavity simultaneously.Do not need independent Sealing like this, pump structure is simple, and processing cost is low.

In order to simplify the adjusting of oily quantity delivered, advantageously, a pipe valve is arranged on the suction side of adjustable oil pump.Pipe valve is simple in structure and avoided producing when the cut-off valve pressure peak by being arranged on the suction side in pump.

Pipe valve can directly be integrated in the oil pump case, thereby makes valve and pump case constitute an one-piece element.If have only very little or very rugged installing space to utilize, the valve that then preferably will be used to regulate oil pump separates with pump case.Be particularly conducive to the consideration installation conditions thus.

Pipe valve can be a distributing valve, supplies with or cut off the additional oil quantity delivered selectively by it.In a preferred construction, the particularly stepless adjustable control valve of pipe valve.A control valve rotary piston valve particularly for this reason.Carry additional oil mass can realize fine setting by adjustable oil pump, thereby reduced mechanical loss and reduced expense thus.

Description of drawings

Below, further describe embodiments of the invention by accompanying drawing, wherein:

Fig. 1 shows vertical sectional view of pumping system, and it has two pistons that are the pump of one and are in two global designs of lower dead centre;

The piston that Fig. 2 shows Fig. 1 is in the situation of upper dead center;

The pipe valve that Fig. 3 shows Fig. 1 and 2 is in the situation of closed condition;

Fig. 4 shows the schematic cross section of the rotatable piston details of Fig. 1-3;

Fig. 5 shows the situation of Fig. 4 piston rotation 180 degree;

Fig. 6 shows vertical sectional view of adjustable another embodiment of oil pump, and it has the piston that is in lower dead centre, and piston stroke is adjusted to less;

The piston that Fig. 7 shows Fig. 6 is in the situation of lower dead centre;

Fig. 8 shows the layout of Fig. 6, wherein the piston stroke maximum;

Fig. 9 shows the layout of Fig. 7, and wherein piston stroke maximum and piston are in lower dead centre;

Embodiment

Fig. 1 shows a kind of sectional view of pumping system, and this pumping system is used for lubricant oil 1 is transported to the cutting chain (unshowned) of chain saw.This pumping system comprises an adjustable oil pump 2 of user and a basic oil pump 3.Two

oil pumps

2,3 have supplying

tube

24,26 and

output tube

25,27 respectively.Suck lubricant oil 1 by supplying

tube

24,26, and release by output tube 25,27.Adjustable oil pump 2 and basic oil pump 3 are communicated with same fuel tank (not shown) by supplying

tube

24,26 separately.Two

output tubes

25,27 lead to the cutting chain of chain saw, therefore two oil pumps, 2,3 parallel connections.In order to realize a plurality of switching stages, can other adjustable oil pump 2 in parallel again.

Pumping system can be the system with gear pump, diaphragm pump or similar pump, and is embodied as piston pump system in the embodiment shown.To this, piston piece 4 has circular cross section, and this piston piece 4 rotation axis 20 that rotates is rotated along the direction of arrow 30.Piston piece 4 moves in pump case 11 hermetically, and a control pin 6 directions with respect to rotation axis 20 are fixed on the pump case 11.Piston piece 4 has an annular skewed slot 5, and control pin 6 is wherein engaging-in.This skewed slot 5 tilts with respect to the vertical line of rotation axis 20.Because piston piece 4 rotates in arrow 30 directions, the effect of the control pin 6 by fixed-site in skewed slot 5 has realized the vibration stroke movement of piston piece 4 in rotation axis 20 directions.Piston piece 4 is in the position of its lower dead centre approximately, from the direction axial motion along arrow 19 when further rotating of this position piston piece 4.

Form at piston piece 4 and to have different-diameter D ₁, D ₂Two

pistons

7,8, the diameter D of Shang Mian piston 8 wherein ₁Diameter D less than following piston 7 ₂The diameter D of lower piston 7 ₂Identical with the diameter at piston piece 4 all the other positions.Two-

piston

7,8 is the stepped shaft transition each other.In the zone of two-

piston

7,8, pump case 11 is made of

corresponding cylinder body

9,10 by a shoulder hole, and wherein two-

piston

7,8 imports in the

corresponding cylinder body

9,10 in the axial direction hermetically and also can slide at circumferencial direction.

Be full of the pump chamber of lubricant oil 1 when a job is set above small piston 8, it is limited by piston 8 and pump case 11.Lead to corresponding supplying tube 24 and output tube 26 at piston 8 circumferences.Piston 8 sides have a space 22, by this space 22 shown in the pivotal position of piston piece 4 make pump chamber 21 and last output tube 25 flow to be communicated with.When arrow 19 directions were carried out stroke movement, the lubricant oil 1 that is arranged in pump chamber 21 extruded by output tube 25 and carries along the direction of unshowned chain saw at piston piece 4.

Basis oil pump 3 and adjustable oil pump 2 are similar.The following pump chamber 31 of basis oil pump 3 is defined by small piston 8 peripheral wall by piston 7, pump chamber 31 and in the inboard.By 22 feasible pump chambers 31 down of the side direction space on the piston 7 and the corresponding 27 mobile circulations of output tube down.In advance through lubricant oil 1 that supplying tube 26 down sucks piston piece 4 when the direction of arrow 19 is carried out stroke movement from pump chamber 31 down through under output tube 27 be transported to the chain saw (not shown) along arrow 29.

The diameter of two-

piston

7,8 or

corresponding cylinder body

9,10 is definite like this, and promptly when the stroke of piston piece 4 was determined, the maximum output rating of adjustable oil pump 2 was littler than basic oil pump 3.Thereby the stroke of the stroke of piston piece 4 and two-

piston

7,8 is determined according to the oblique position of groove 5 and the fixed bearing of control pin 6.The supplying tube 26 and the output tube 27 of basis oil pump have a controlling device, and it is littler than the degree of piston piece semi-finals system control.Thus, but the quantity delivered of basic oil pump or output rating furnishing are fixing.For factory or user's adjusting, also can regulate the quantity delivered of basic oil pump, in supplying tube 26 or output tube 27 for example by the adjustable stroke of piston piece 4 or throttling arrangement is set realizes.

Pump case 11 is surrounded by tube shell 43 at the upper area of pumping system or supplying tube and

output tube

24,25,26,27 zones.Be preferably in supplying tube 24 zones a pipe valve 12 is set.A roughly cylindrical valve body 23 is set for this reason, and it can be arranged in the tube shell 43, perhaps directly be arranged in the pump case 11, and rotatable being bearing in wherein.Pump case 11 has constituted a public member with a part and the pipe valve 12 of supplying tube 24.Adjustable pipe valve 12 is whole.

In the pivotal position of illustrated valve body 23, pass the hole 14 of valve body 23 and aim at last supplying tube 24.Therefore, supplying tube 24 is through-flow.Valve body 23 has a circular groove 15, and is fixed in locating stud 16 engaging-in these grooves in the tube shell 43.Thus, valve body 23 is in axially locating.Valve body 23 distolateral a notch 18 is arranged, be used for socket screw cutter or similar tool.By the rotation of valve body 23, the position deviation of hole 14 from aiming at supplying tube 24 makes lubricant oil 1 to the input of adjustable oil pump 2 suction sides carry out throttling up to being zero.In order to limit the rotation of valve body 23, it has a stop member 17.Thus, the delivered volume of user's can regulate oil pump 2.

In the foregoing description, pipe valve 12 directly is integrated in the housing 11 of oil pump 2 or in supplying tube 24 zones and forms, and is different therewith, and pipe valve 12 and pump case 11 are separated.This just makes pipe valve 12 assemble with pump case 11 spans.Advantage is arranged especially having only under the utilizable situation of very little or very rugged assembly space like this.Pipe valve 12 can be realized by rigidity or flexible best plug-in pipeline with being connected of adjustable oil pump 2.

Fig. 2 shows the situations of piston piece 4 rotations 180 degree among Fig. 1.Because control pin 6 cooperates with skewed slot 5, forms the relative position of piston piece 4 with respect to pump case 11, this moment, piston piece 4 was in upper dead center position approximately.The capacity minimum of pump chamber 21,31.Shown in the pivotal position, space 22 is towards supplying

tube

24,26, they are communicated with

pump chamber

21,31 thus.

Output tube

25,27 is by the peripheral wall sealing of

piston

7,8.

When the direction of arrow 30 is further rotated, carry out stroke movement to lower edge arrow 32 directions at piston piece 4, so the volume of

pump chamber

21,31 becomes big, thus, lubricant oil 1 sucks through supplying

tube

24,26.

Along with the continuous rotation of piston piece 4, form the oscillatory movement of piston piece 4 along arrow 19 (Fig. 1) or arrow 32 (Fig. 2) direction in arrow 30 directions.Alternately make

pump chamber

21,31 be communicated with by space 22, realize the suction process of two

oil pumps

2,3 with supplying tube 24 or

output tube

25,27.

Fig. 3 show among Fig. 1 pipe valve 12 by the time situation.Valve body 23 with respect to rotated position shown in Figure 1 90 the degree.Hole 14 is vertical with last supplying tube 24, and this supplying tube is closed.Lubricant oil 1 can not be transported to pump chamber 21 by supplying tube 24.Adjustable oil pump 2 can not be carried lubricant oil 1, and basic oil pump 3 is transported to lubricant oil 1 on the cutting chain along arrow 29 directions by following output tube 27.

Valve body 23 can steplessly rotate, thus by hole 14 with respect to relatively rotating that supplying tube 24 can freely be selected, can the step-less adjustment throttling action.Therefore, pipe valve 12 is step-less adjustment control valves.By shown in rotation valve body 23 as can be known, control valve 13 is rotary piston valves.In addition, preferably adopt linearly moving valve body 23, throttling turnover panel, adjustable baffle plate or the like.Also can adopt the distributing valve of between two or more positions, changing according to purpose.

In the embodiment shown, pumping system is the total system of two

oil pumps

2,3, wherein two piston pieces 4 that oil pump has common pump case 11, tube shell 43 and one.Also can adopt two

independent oil pumps

2,3 of similar and different structure.For example, for two

oil pumps

2,3 of separation structure, basic oil pump 3 has definite stroke, and the

piston

7,8 of adjustable oil pump has variable stroke.The structure of Fig. 6-9 for example.

Fig. 4 shows the schematic representation in upper piston 8 zones in the described structure of Fig. 2.During along position shown in arrow 30 directions are driven in rotation, supplying tube 24 is communicated with last pump chamber 21 by the space 22 of piston 8 side direction at piston 8.Simultaneously, supplying tube 25 is by the peripheral wall sealing of piston 8.When piston 8 moved downward, lubricant oil 1 (Fig. 2) flow to space 22 and flows to pump chamber 21 (Fig. 2) thus along the direction of arrow 33.

Fig. 5 shows the situations of piston 8 rotations 180 degree in the structure shown in Figure 4.Supplying tube 24 is by the peripheral wall sealing of piston 8.Output tube 25 is communicated with space 22.When piston 8 moved upward, lubricant oil 1 22 flowed along the direction of arrow 28 by output tube 25 through the space from pump chamber 21 (Fig. 1).

Fig. 6 shows another embodiment's of the adjustable oil pump of quantity delivered schematic representation.Shown oil pump can use separately or use in the pumping system of Fig. 1-5.Be not shown specifically the details by the 4 control oil flows of rotating piston spare here, this is identical with the situation shown in Fig. 1-5.

At the free end of piston piece 4 gear 36 with helical teeth is set.This gear and a worm meshing, thus, piston piece 4 rotates around it axis 20 along the rotatable driving of arrow 30 directions.Piston piece 4 is rotatable and be supported with longitudinal movement in pump case 11.In the control pin 6 engaging-in skewed slots 5, produce the vibration stroke movement of piston piece 4 in four-headed arrow 44 directions by rotation in the direction of arrow.

In an illustrated embodiment, control pin 6 is radially removable in four-headed arrow 35 directions with respect to rotation axis 20.To this, control pin 6 has one 38, and it vertically is bearing in the housing 11 movably.Vertically movably supporting for example can realize by unshowned screw thread.When for example the control pin on head 39 6 rotates, can realize controlling pin 6 moving radially in four-headed arrow 35 directions.

In axle 38 end one ball portion 37 is set, in its engaging-in skewed slot 5 towards piston piece 4.The side of skewed slot 5 is in the axial direction by substantially be flat, parallel to each other and perpendicular to

inclination cell wall

41,42 qualifications of rotation axis 20.Ball portion 37 do not have the gap substantially or with very little Spielpassung between

cell wall

41,42, thereby be implemented in four-headed arrow 44 directions to the pressure of piston piece 4 control.

When arrow 30 directions are rotated, change

cell wall

41,42 oblique positioies at piston piece 4 back and forth with respect to ball portion 37.The wearing and tearing that

cell wall

41,42 rolls have been reduced by the ball surface on ball portion 37.

Control pin 6 is positioned at the radial position of ball portion 37 near rotation axis 20 among the figure.As seen from Figure 7, after piston piece 4 and

cell wall

41,42 rotated 180 degree relatively, the stroke that piston piece 4 shifts out was h ₁

Fig. 8 shows that control pin 6 radially outwards are moved in the layout of Fig. 6.This moment, ball portion 37 was near the spherical carrier 40 of pump case 11, but ball portion 37 still cooperates with skewed slot 5.Because the ball portion 37 relevant with the oblique position of

cell wall

41,42 increases with respect to the radial distance of rotation axis 20, make shown in the volume of volume ratio Fig. 6 of upper dead center top pump chamber 21 little.In an illustrated embodiment, piston 8 close pump case 11 is distolateral.

Fig. 9 shows the layout that Fig. 8 piston piece 4 rotates 180 degree, and this moment, piston piece 4 was positioned at lower dead centre, because ball portion 37 is bigger than the radial distance in Fig. 6 and 7 with respect to the radial distance of rotation axis 20, and the stroke h of generation ₂Want big.Therefore, shown in the volume ratio of lower dead centre top pump chamber 21 volume of in Fig. 7, controlling the situations that pin 6 moves inwards want big.Thus, by stroke h ₁Or h ₂Stroke chamber pact that forms and ball portion 37 are the substantial linear increase with respect to the radial distance of rotation axis 20.Shown in the quantity delivered of oil pump approximately linear and by control pin 6 radial distance can regulate with respect to rotation axis 20 with the stroke chamber.

Control pin 6 can also further outwards move, and makes ball portion 37 be in ball-joint fully and connects in the part 40 and no longer cooperate with skewed slot 5.Like this, can be easy to installation or removal piston piece 4.

All the other features and reference character shown in Fig. 6-9 in the structure, identical with Fig. 1-5.

Claims

1. one kind is transported to a pumping system on the chain saw cutting chain with lubricant oil (1), the oil pump (2) that comprises the adjustable quantity delivered of at least one user, wherein oil pump (2,3) be reciprocating pump, it has the piston piece (4) that rotatably drives around a rotation axis (20) around its longitudinal axis, on piston piece (4), be provided with the skewed slot (5) of annular, in engaging-in this skewed slot of control pin (6) (5) on being axially fixed in housing, wherein said control pin (6) is diametrically opposed removable in described rotation axis (20), that wherein said skewed slot (5) distributes by being parallel to each other in the axial direction and cell wall (41 that tilt with respect to vertical line perpendicular to described rotation axis (20), 42) limit, and an end in the face of described piston piece (4) of wherein said control pin (6) is engaged between the described cell wall (41,42).

2. pumping system as claimed in claim 1 is characterized in that, a basic oil pump (3) is in parallel with this adjustable oil pump (2).

3. pumping system as claimed in claim 1 is characterized in that: the quantity delivered of basic oil pump (3) is transferred to fixing.

4. pumping system as claimed in claim 2 is characterized in that: the maximum output rating of adjustable oil pump (2) is littler than basic oil pump (3).

5. as the described pumping system of one of claim 1-4, it is characterized in that: each piston (7,8) of two oil pumps (2,3) is fixed on the common piston piece (4).

6. pumping system as claimed in claim 5 is characterized in that: described two pistons (7,8) are integral with piston piece (4).

7. pumping system as claimed in claim 5 is characterized in that, the diameter (D of piston (7,8) ₁, D ₂) the different and middle guiding of the respective steps shape cylindrical hole (9,10) in pump case (11).

8. pumping system as claimed in claim 7 is characterized in that, described pump case (11) is integrally formed.

9. pumping system as claimed in claim 1 is characterized in that: adjustable oil pump (2) is regulated its quantity delivered by a pipe valve (12).

10. pumping system as claimed in claim 9 is characterized in that: pipe valve (12) is arranged on the suction side of adjustable oil pump (2).

11. pumping system as claimed in claim 9 is characterized in that: pipe valve (12) is a control valve (13).

12. pumping system as claimed in claim 11 is characterized in that: described control valve (13) is stepless adjustable.

13. pumping system as claimed in claim 11 is characterized in that: control valve (13) is a rotary piston valve.

14. pumping system as claimed in claim 1 is characterized in that: the end in the face of described piston piece (4) of described control pin (6) seamlessly is engaged between the cell wall (41,42).

15. pumping system as claimed in claim 1 is characterized in that: described control pin (6) in the face of the end of described piston piece (4) with little Spielpassung between cell wall (41,42).

16. pumping system as claimed in claim 1, it is characterized in that: described control pin (6) is provided with an axle (38), wherein be provided with a ball portion (37), in the engaging-in described skewed slot of this ball portion (5) facing on the end of described piston piece (4) of this axle (38).

17. pumping system as claimed in claim 16, it is characterized in that: a pump case (11) is provided with a spherical carrier (40), and this control pin (6) can outwards be moved diametrically, makes described ball portion (37) be arranged in described spherical carrier (40) fully.