CN1185409C

CN1185409C - Guiding mechanism for circulating drive

Info

Publication number: CN1185409C
Application number: CNB011214503A
Authority: CN
Inventors: 岩田和之
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2000-06-07
Filing date: 2001-06-07
Publication date: 2005-01-19
Anticipated expiration: 2021-06-07
Also published as: ID30465A; TW520424B; JP2001349400A; CN1328220A; JP3460980B2

Abstract

A guide mechanism of a wrapping power transmitter used in a wrapping power transmission system such as chain gearing system includes a slide contact member having a front surface for contact with a wrapping power transmitter; a support member integrally formed with the slide contact member to support the back of the slide contact member; an oil supply channel extending in the lengthwise direction of a contact surface of the slide contact member for receiving lubricant oil; oil supply means located at an upstream portion of the slide contact member with respect to the rotating direction of the power transmitter to supply lubricant oil onto the contact surface of the slide contact member; and a communication path for communicating the oil supply means with the oil supply channel (6a).

Description

The guide mechanism of circulating drive

Technical field

The present invention relates to be used for the guide mechanism of the transmission device of surrounding type transmission system, for example chain drive especially relates to its lubricating fitting.

Background technique

The common chain drive that is used for the valve drive system of 4 stroke cycle internal-combustion engines for example discloses at Japanese Patent Application Publication No.2000-97042.Figure 13 is its schematic representation, and Figure 14 is the orthographic projection view of tensioner arms shown in Figure 13, and Figure 15 is the planimetric map of this tensioner arms, and Figure 16 is the sectional drawing along the line XVI-XVI among Figure 14, and Figure 17 is the sectional drawing along the line XVII-XVII among Figure 14.

As shown in figure 13, chain drive comprises: be installed in first sprocket wheel 03 on the crankshaft; Be installed in second on camshaft and the

3rd sprocket wheel

06,07; And chain 08, this chain 08 is around these three

sprocket wheels

03,06,07, so that rotatablely moving of crankshaft passed to camshaft.

Driven end bay along chain 08 comprises arm 020 and guide shoe (guide shoe) apart from the chain tensioning device of arranging, this guide shoe is installed on the arm 020, so that chain 08 is moved along this guide shoe slidably.One end of arm 020 is by pivot pin 021 pivot suspension, and the other end (effect end) engages with the piston 015a of hydraulic tensioner 015.

As Figure 14 and shown in Figure 15, arm 020 has cotter slot 023 at the one end, is used to install pivot pin 021 (Figure 13), is formed with through hole (inlet hole) 20a at its other end, and this through hole has oval cross section.

Shown in Figure 16 and 17, the basic archwise of contact plane 020b extends, and at this contact plane 020b place, arm 020 is in guide shoe 030 contact, and 020 upper edge contact plane 020b is formed with the oil groove 020c that is generally semi-circular cross-section at arm.The end of oil groove 020c is communicated with in inlet hole 020a, the other end of oil groove 020c extend to cotter slot 023 above.

Usually the guide shoe 030 in the arc extension of length direction has a plurality of through hole 030a (two holes are arranged in the illustrated example).When guide shoe 30 assembled with arm 020, these through holes 030a was communicated with the oil groove 020c of arm 020.Guide shoe also has groove 030b, and this groove is upward opening shown in Figure 16 and 17, so that 08 motion of guiding chain.

The piston 015a of hydraulic tensioner 015 has a hole (not shown), and lubricant oil is supplied with by this hole from unshowned pressurizing and lubricating oil supply source.

In the chain drive of the type, when the rotation of first sprocket wheel 03 (Figure 13), when chain 08 moved with direction shown in the arrow, hydraulic tensioner 015 was driven, the free end of piston 015a compressing arm 020.Therefore, arm 020 is around pivot pin 021 swing, and guide shoe 030 compressing chain 08 is so that apply suitable tension force to chain 08.

At this moment, the lubricant oil of supplying with from unshowned pressurizing and lubricating oil supply source flows out from the unshowned hole of the piston 015a of hydraulic tensioner 015.The lubricant oil that flows out flows through the inlet hole 0201 of arm 020 and enters oil groove 020c.020 cotter slot 023 moves along oil groove 020c towards arm to enter lubricant oil among the oil groove 020c, enter then guide shoe 030, with through hole 030a that oil groove 020c is communicated with in, and flow out this through hole 030a and flow on the outer surface of guide shoe.

On the other hand, chain 08 moves at guide shoe 030 upper edge guide shoe 030 with direction shown in the arrow (Figure 13).At this moment, the lubricant oil that flows out from through hole 030a is dispersed between guide shoe 030 and the chain 08.

Because above-mentioned common guide mechanism adopts along the surface of contact 020b that contacts with guide shoe 030 of arm 020 and go up the oil groove 020c that forms, a plurality of through hole 030a that form and be communicated with oil groove 020c equally on an inlet hole 020a that forms on the part of arm 020 and be communicated with this oil groove 020c and the part at guide shoe, so it is its complex structure, and very expensive.And because inlet hole 020a is positioned near the rear end with respect to the circular movement direction of chain 08, therefore, the surface that lubricant oil supplies to guide shoe 030 needs certain hour.

Summary of the invention

In order to solve these problems that comprise in the prior art, according to a first aspect of the invention, provide a kind of guide mechanism of circulating drive, comprising: a sliding contact part, the front surface of this sliding contact part contacts with circulating drive; One supporting member, this supporting member and this sliding contact part are whole to form the rear portion that is used to support this sliding contact part; One lubricant oil is supplied with groove, and this lubricant oil is supplied with the length direction extension of groove along the contact surface of sliding contact part, is used to hold lubricant oil; Oil feeding device, this oil feeding device are positioned at the upstream portion office with respect to the transmission device sense of rotation of sliding contact part, so that lubricant oil is supplied on the contact surface of sliding contact part; And a communication passage, be used to make described oil feeding device and described lubricant oil to supply with groove and be communicated with.

In the present invention with said structure, because oil feeding device is in the upstream portion of contact surface transmission device, that contact with the sliding contact part, by the rotation of transmission device, lubricant oil spreads to the whole surface of sliding contact part.Therefore, adopt simple structure, just can be along the length direction supplying lubricating oil of sliding contact part, thus reduce to act on frictional force on the transmission device, and can this transmission device of smooth driving.

And because lubricant oil is supplied with the front surface of groove at the sliding contact part, lubricant oil supplies to this lubricant oil and supplies with in groove, therefore prevents lubricant oil because sliding motion and spilling between the surface of sliding contact part and transmission device.And, because supplying with the existence of groove, lubricant oil cause the area of contact between transmission device and the sliding contact part to reduce, therefore help reducing the frictional force between them, reduce their wearing and tearing.

This mechanism can comprise a plurality of lubricant oil supply grooves.

At this moment, lubricant oil is easier to spread on the whole width of sliding contact part, and the shear resistance of lubricant oil reduces.And, because supplying with groove, these lubricant oil cause the area of contact between transmission device and the sliding contact part littler, therefore the frictional force that acts on the transmission device further reduces.

The lubricant oil that this mechanism can be included on each side margin of contact surface of contact is supplied with groove.

At this moment, because lubricant oil is supplied with the opposite side edge extension of groove along the contact surface of sliding contact part, even when a side margin of sliding contact part contact with trough rim, can prevent that along the mobile lubricant oil of the respective side edge of sliding contact part this part from wearing and tearing in the bottom of a side margin of side of transmission device deflection sliding contact part and transmission device.

This mechanism can be included in the holding device in the lubricant oil supply groove, so that keep from the lubricant oil of oil feeding device supply.

At this moment because that this holding device maintains is a certain amount of at least, from the lubricant oil that oil feeding device is supplied with, therefore,, also can have the lubricant oil of q.s to supply with to transmission device even when start-up operation (when transmission device begins to rotate).Therefore, this transmission device can smooth rotation, and can prevent wearing and tearing, vibration etc.

This holding device can comprise the partition wall that separates lubricant oil supply groove.

At this moment, this partition wall can not only keep lubricant oil, and strengthens the rigidity that this lubricant oil is supplied with slot part.Therefore can prevent that lubricant oil from supplying with the sidewall of groove because the load of chain bend into lubricant oil supply groove.Therefore, lubricant oil energy stable supplying, and prevent that the sliding contact part from damaging.

This lubricant oil is supplied with groove and can at one end be sealed.

At this moment, even this lubricant oil supply groove also can keep the lubricant oil of q.s when transmission device stops, and can be reliably to this transmission device supplying lubricating oil when transmission device restarts to rotate.Therefore, even after long-time shut-down operation, this transmission device also can smooth rotation, and can prevent wearing and tearing.

Description of drawings

Fig. 1 is the free-ended amplification of the chain tensioning device of one embodiment of the invention, the side view of partial cutaway;

Fig. 2 is the front view along the direction of arrow II-II among Fig. 1;

Fig. 3 is the view of expression along the line III-III among Fig. 1 or Fig. 2, and has chain;

Fig. 4 is the free-ended front view of the chain tensioning device of expression second embodiment of the invention;

Fig. 5 is the view of expression along the line V-V among Fig. 4, and has chain;

Fig. 6 is the free-ended front view of the chain tensioning device of expression third embodiment of the invention;

Fig. 7 is the view of a kind of version of expression third embodiment of the invention;

Fig. 8 is the free-ended front view of the chain tensioning device of expression fourth embodiment of the invention;

Fig. 9 is the free-ended front view of the chain tensioning device of expression fifth embodiment of the invention;

Figure 10 is the free-ended front view of the chain tensioning device of expression sixth embodiment of the invention;

Figure 11 is the longitudinal section along the line XI-XI among Figure 10;

Figure 12 is the cross-sectional figure along the line XII-XII among Figure 10;

Figure 13 is the schematic representation of the existing chain drive of expression;

Figure 14 is the front view of tensioner arms shown in Figure 13;

Figure 15 is the planimetric map of this tensioner arms;

Figure 16 is the sectional view along the line XVI-XVI among Figure 14; And

Figure 17 is the sectional view along the line XVII-XVII among Figure 14.

Embodiment

Fig. 1 is the free-ended amplification of the chain tensioning device of one embodiment of the invention, the side view of partial cutaway.Fig. 2 is the front view along the direction of arrow II-II among Fig. 1.Fig. 3 is the view of expression along the line III-III among Fig. 1 or Fig. 2, and has chain.

In these accompanying drawings, reference number 1 expression is as the chain of circulating drive, and this chain is by will the row of number connecting plate 1a layering overlapping and with pin they are connected into ring form and make.Reference number 2 expressions are as the guide shoe of slidable member, and the front surface of this guide shoe contacts with chain 1.This guide shoe 2 has the chain tensioning device main body 3 as supporting member, this chain tensioning device main body 3 with and guide shoe 2 whole formation of rear surface.

In this embodiment, guide shoe 2 has the lubricant oil that its front surface extends in the length direction upper edge of this guide shoe 2 to supply with groove, so that supplying lubricating oil.This lubricant oil is supplied with the width of groove 6a and is supplied with groove 6a for the side that can prevent chain 1 when chain 1 is partial to a side of guide shoe 2 falls into this lubricant oil.

On the other hand, the piston of unshowned hydraulic tensioner is arranged in the back of chain tensioning device main body 3, and at the upstream position with respect to the chain movement direction of this chain tensioning device main body 3, so that play the function that lubricant oil is supplied to guide shoe 2 lip-deep oil feeding devices, and this piston has the oil pathway that passes himself.Grease channel 4 is as connecting passage, directly make oil pathway and lubricant oil supply with groove 6a and link to each other, and this grease channel 4 be opened on lubricant oil supply with groove 6a interior, with respect to the position of chain movement direction in guide shoe 2 upstreams.

With respect to " upstream " side of chain movement direction is to be used for being illustrated in that part that chain 1 beginning that the longitudinal component of guide shoe 2 moves contacts with guide shoe 2, and " downstream " side is represented the opposite side of guide shoe 2, in this position, the various piece of the chain 1 of motion and guide shoe 2 are thrown off (in the following description too).

Around unshowned sprocket wheel and thereby the chain 1 of motion by guiding of the guide shoe 2 of chain tensioning device and compressing.On the other hand, the lubricant oil that pumps out from unshowned oil pump is by supplying with at the chain tensioning device main body piston back, unshowned hydraulic tensioner, enters oil groove 6a on the front surface of guide shoe 2 by grease channel 4 then.Lubricant oil moves along the length direction of grease channel 4 with guide shoe 2, the anterior contact surface of therefore lubricated chain 1 and guide shoe 2.

At this moment, even chain 1 is for example by a plurality of connecting plate 1a are linked to each other with the silenet chain that forms, it has determined the planar surface that contacts with guide shoe 2, and the existence that lubricant oil is supplied with groove 6a also causes the area of contact between chain 1 and the guide shoe 2 to reduce, and can reduce to act on the frictional force on the chain 2.And even move to high height from the W lower height, because lubricant oil is pulled and scatters along the direction of chain movement, lubricant oil also can supply on the whole length of guide shoe 2.

Supply with among the groove 6a because directly lubricant oil is supplied to the lubricant oil of guide shoe 2, so this embodiment can prevent effectively that also lubricant oil is owing to the relative movement of guide shoe 2 and chain 1 spills.

Like this, this embodiment can be on the whole length of guide shoe 2 supplying lubricating oil, and reduce to act on the frictional force of chain 1, thus can smooth driving, that is adopted simultaneously is simple in structure.

Fig. 4 is the front view of free end portion of the chain tensioning device of expression second embodiment of the invention.Fig. 5 is the view along the line V-V among Fig. 4, and has chain.In this embodiment, provide two lubricant oil in front surface (contact surface) both sides of the edge, upper edge of guide shoe 2 and supply with

groove

6b, 6b.

By grease channel 4 supply on the guide shoe 2 lubricant oil for example lubricant oil supply with

groove

6b, 6b, and flow through the total length of this guide shoe 2.Like this, the whole contact surface of chain 1 and guide shoe 2 is all lubricated.Have, this lubricant oil is supplied with

groove

6b, 6b and is caused the area of contact of chain 1 and guide shoe 2 to reduce, thereby reduce to act on the frictional force on the chain 1 again.In addition, flow along the both sides of the edge of guide shoe 2 because this second embodiment guarantees lubricant oil, though in a side bottom of side of chain 1 deflection guide shoe 2 as shown in Figure 5 and chain 1 when trough rim along a side margin of guide shoe 2 contacts, the wearing and tearing of this part reduce.

And, because this embodiment guide shoe 2, provide lubricant oil with the corresponding surface portion in side angle of chain 1 and supply with groove 6b, even at chain 11 during in the rotation process medium dip, the surface that also can prevent guide shoe 2 is because one jiao of chain and concentrated wear.And, because supply in the lubricant oil on the contact surface behind the contact surface that has lubricated chain 1 remaining that part for example the lubricant oil of offside supply with among the groove 6b, so this embodiment can prevent that lubricant oil from spilling towards periphery.

Fig. 6 is the free end portion view of the chain tensioning device of expression third embodiment of the invention.In this embodiment, guide shoe 2 forms " Z " font lubricant oil in its surface and supplies with groove 6c.

This structure helps the lubricant oil deflection dispersion to the whole width of guide shoe 2, and further reduces the shear resistance of lubricant oil.In addition, extend forward with " Z " font, prevent that therefore this chain heap is to a side because lubricant oil is supplied with groove.

In example shown in Figure 6, lubricant oil is supplied with groove 6c and is extended on the whole length of guide shoe 2 with " Z " font; But, this lubricant oil is supplied with groove and can be changed in a variety of forms, and for example: shown in Figure 7, wherein lubricant oil is supplied with the center line extension of the end portion of groove 6d along guide shoe 2, and is similar with first embodiment.

Fig. 8 is the front view of free end portion of the chain tensioning device of expression fourth embodiment of the invention.In this embodiment, lubricant oil is supplied with the length direction inclination of groove 6e guide shoe 2 parallel to each other and corresponding.

When deliberately making chain amesiality, hope selects this embodiment for use.At this moment, for example owing to the cantilever support of sprocket wheel produces left power, then offset this power left by to the right an active force.When this chain deflection left side, lubricant oil is guiding left also, and the friction and wear of guide shoe 2 left part reduces.

Fig. 9 is the free-ended front view of the chain tensioning device of expression fifth embodiment of the invention.In this embodiment, the part of the upstream position that guide shoe 2 at first is in contact with it at chain 1, promptly the surface of the guide shoe 2 that contacts with chain 1 is wideer than the remaining part of guide shoe 2 in the part of upstream extremity along the sense of rotation of chain 1.In addition, lubricant oil is supplied with groove 6f and is upstream extended at first position contacting 7 from grease channel 4, and lubricant oil is supplied with this end sealing of groove 6f.

Because in this embodiment, the part at first position contacting 7 places of upstream side of guide shoe 2 is wideer than remaining part, so that bigger area of contact is provided.Chain 1 can reliably be guided, and the guide shoe 2 that this rigidity strengthens can reduce owing to contacting the impact that causes with chain 1.Therefore, though when the supporting point (pivot) of chain tensioning device main body 3 along the downstream position of the sense of rotation of chain 1 time, also can prevent to cause vibration or noise owing to guide shoe 2 vibrations and bump chain 1, perhaps can not hinder the rotation of chain 1.

And, in the present embodiment, because lubricant oil is supplied with groove 6f and is extended to the contact position 7 that at first contacts with chain 1, and its upstream extremity sealing, therefore, supply with among the groove 6f, like this even when chain 1 remains static, also there is the lubricant oil of q.s to remain on lubricant oil, when chain 1 rotated again, lubricant oil also can be supplied with to chain 1 reliably.Therefore, even after internal-combustion engine stops for a long time, chain 1 also can smooth rotation, thereby prevents wearing and tearing.

When guide shoe 2 is in chain 1 from position that upper position rotates, be positioned at first position contacting 7 places of upstream by making grease channel 4, also can guarantee to obtain essentially identical effect.

When guide shoe 2 is arranged in chain 1 from position that lower position upwards rotates, lubricant oil is supplied with groove 6f and is upstream crossed grease channel 4 and extend and will make lubricant oil remain on this lubricant oil to supply with in groove 6f, and effectively lubricating chain 1 can restart after the engine long time stops the time.

Figure 10 is the free-ended front view of the chain tensioning device of expression sixth embodiment of the invention.Figure 11 is the longitudinal section along the line XI-XI among Figure 10.Figure 12 is the cross-sectional figure along the line XII-XII among Figure 10.

In the present embodiment, lubricant oil is supplied with groove 6g and extended along the center line of guide shoe 2, and is similar with first embodiment, and have a plurality of as partition wall, height supply with less than lubricant oil groove 6g the degree of depth every the weir.Just, lubricant oil is supplied with groove 6g by being separated into a plurality of parts every weir 8, to form each oil storage tank 9.

Therefore, a certain amount of lubricant oil can remain in each oil storage tank, and helps chain drive-belt more glossily.And even when also not supplying with the lubricant oil of q.s when engine start for example, because a certain amount of lubricant oil remains in the oil storage tank 9, this helps the smooth motion of chain 1 and prevents wearing and tearing, vibration etc., up to the lubricant oil normal supply.

And, in this embodiment, supply with groove 6g to separate this lubricant oil because in lubricant oil supply groove 6g, provide every weir 8, therefore, these not only help keeping lubricant oil every the weir, can also strengthen lubricant oil and supply with this a part of rigidity of groove 6g.Therefore, can prevent that lubricant oil from supplying with the sidewall of groove 6g because the load of chain 1 bend into lubricant oil supply groove 6g.Therefore, lubricant oil can reliably be supplied with, and can prevent guide shoe 2 wearing and tearing.

And, in the present embodiment because be lower than the degree of depth that lubricant oil is supplied with groove 6g every weir 8, chain 1 not can with contact every weir 8, can prevent wearing and tearing and generation noise.In addition, lubricant oil can remain on lubricant oil and supply with among the groove 6g, can not interfere lubricant oil to supply with the motion of the lubricant oil among the groove 6g.

Must not cross lubricant oil as shown in the figure every weir 8 and supply with span between the opposing sidewalls of groove 6g.For example, they can extend with " Z " font form.But, supply with on the total length of groove 6g for the rotation that guarantees chain 1 can make lubricant oil be dispersed in lubricant oil, importantly the height every the weir is lower than the height that lubricant oil is supplied with the sidewall of groove 6g, and promptly lubricant oil is supplied with the degree of depth of groove 6g.

Previous embodiment all is to describe from chain tensioning device state 3 back by front surface (contact surface) supply of grease channel 4 to guide shoe 2 by lubricant oil.But, the supplier of lubricant oil is not limited thereto.For example, also can be by making lubricant oil inject between chain 1 and the guide shoe 2 and making its inflow lubricant oil supply groove and other parts improve lubricated from top.

In the aforementioned embodiment, lubricant oil is supplied with

groove

6a, 6b etc. and is enough extended on the length direction of guide shoe 2, must not extend on its whole length.The front surface of guide shoe 2 (its surface that contacts with chain 1) preferably up, still, though when it down the time because chain 1 covers it, and the lubricant oil toughness, this surface also can maintain the lubricant oil of q.s.

Claims

1. guide mechanism that is used for applying tension force to circulating drive, it comprises:

Sliding contact part (2), this sliding contact part has an elongated front contact surface, is used for contacting with circulating drive (1);

Supporting member (3), this supporting member and described sliding contact part (2) are whole to form the rear portion that is used to support this sliding contact part;

Lubricant oil is supplied with groove (6a-6g), and this lubricant oil is supplied with groove and extended on the length direction of the described front contact surface of described sliding contact part (2), is used for holding lubricant oil within it;

Oil feeding device, this oil feeding device are used for lubricant oil is supplied to the described front contact surface of described sliding contact part (2); And

Communication passage (4) is used to make described oil feeding device and described lubricant oil to supply with groove (6a-6g) and is communicated with; It is characterized in that:

Described lubricant oil is supplied with opening fully on the described front contact surface that groove (6a-6g) is arranged in described sliding contact part (2), described oil feeding device is positioned at the upstream portion office with respect to the sense of rotation of described transmission device (1) of described sliding contact part (2), so that lubricant oil is supplied on the described front contact surface of described sliding contact part (2).

2. the guide mechanism that is used for applying tension force according to claim 1 to circulating drive, wherein: be provided with at least one and described lubricant oil and supply with the extra lubricant oil of groove (6a-6g) equivalence and supply with groove, thereby to supply with the quantity of groove be a plurality of to lubricant oil.

3. the guide mechanism that is used for applying tension force to circulating drive according to claim 1, wherein: described lubricant oil is supplied with groove (6b) each opposite side edge setting along the front contact surface of described sliding contact part (2).

4. the guide mechanism that is used for applying tension force according to claim 1 to circulating drive, wherein: in described lubricant oil supply groove (6g), be provided with lubricant oil holding device (8,9), with the lubricant oil that keeps supplying with from described oil feeding device.

5. the guide mechanism that is used for applying tension force to circulating drive according to claim 4, wherein: maintenance comprises the partition wall (8) that separates described lubricant oil supply groove (6g) from the described lubricant oil holding device of the lubricant oil that described oil feeding device is supplied with.

6. the guide mechanism that is used for applying tension force to circulating drive according to claim 1, wherein: the end that described lubricant oil is supplied with groove (6f) seals.