CN106481781A - Toothed cable - Google Patents

Abstract

There is provided and a kind of motor etc. will not be applied with unnecessary load, will not damage and toothed cable that durability is good.Toothed cable (1) possesses core cable (2) and the tooth bar (3) helically winding in the periphery of core cable (2), toothed cable (1) is characterised by, there is the cover layer (4) in the outside continuously covering core cable (2) and tooth bar (3) by resin, toothed cable (1) has the helical form protuberance (41) being formed because resin covers tooth bar (3) and because resin covers the helical form recess (42) being formed between tooth bar, cover layer (4) and core cable (2) and tooth bar (3) contiguity, the thickness (D1) of the cover layer (4) than helical form protuberance for the thickness (D2) of the cover layer (4) of helical form recess (42) is thick.

Description

Toothed cable

Technical field

The present invention relates to the good toothed cable of durability.

Background technology

All the time, the mechanism as the driving force for Transmission gear etc. is it is known to a kind of pass through by metal wire rod

The toothed cable to transmit the driving force of its axis direction for the tooth bar helically winding on the outer peripheral face of core cable constituting.Should

Toothed cable passes through tooth bar, along the axis direction of toothed cable, so that recess is formed with protuberance alternate repetition, is engaged with this recess by making the tooth of gear, and toothed cable is driven along this axis direction, the driving force of the driving source such as Transmission gear.As this kind of toothed cable, for example, a kind of toothed cable 100 disclosed in patent documentation 1, it is characterized in that, as shown in Figure 4, nappe 101 winds in spiral winding and extends in both wire body 102 and cable/core 103, and thick for comparing in the crown portion 102a of the winder of described spiral winding winding wire body 102 respectively, and the core face 103a between described winder is than relatively thin.

In addition, as shown in Figure 5, Patent Document 2 discloses a kind of toothed cable 110, possess the core cable 113 being made up of a plurality of metal wire rod and metal wire rod is equally spaced wound in a spiral in the tooth bar 112 on the outer peripheral face of this core cable 113, and there is the resinous coat 111 of tubulose, this resinous coat 111 is molding by extrusion and is arranged on this toothed cable 110 periphery and has concavo-convex, there is between the recess and core cable 113 of described resinous coat 111 space, the protuberance of described resinous coat 111 is abutted with tooth bar 112.

In the toothed cable 100 of above-mentioned patent documentation 1, nappe 101 winds in spiral winding and extends in both wire body 102 and cable/core 103, the crown portion 102a winding the winder of wire body 102 in described spiral winding is formed as heavy wall, core face 103a between described winder is formed as thin-walled, therefore prevent noise, and there is the durability to abrasion.But, in the toothed cable 100 of patent documentation 1, because the concavo-convex change in toothed cable 100 is big, thus the crown portion 102a that the protuberance of the tooth with toothed cable 100 meshed gears (not shown) and toothed cable 100 is winder can block, the motor (not shown), gear of the described toothed cable 100 of driving can act on unnecessary load.

In addition, be provided with the toothed cable of spiral helicine tooth bar for the outer peripheral face in core, when engaging with gears such as little gear, tooth bars, easily produce noise.In order to prevent this noise, it is proposed that cover and have between core cable 113 toothed cable 110 in space using the resinous coat 111 of tubulose as shown in patent documentation 2.But, due to there is space S between resinous coat 111 and core cable 113, so that engaging with gear under conditions of not making resinous coat 111 produce rupture.

Content of the invention

Present invention aim at providing a kind of load that will not be unnecessary to the applying such as motor, will not damaging and durability

Good toothed cable.

The toothed cable of the present invention possesses core cable and the tooth bar helically winding in the periphery of described core cable, described

Toothed cable is characterised by, has the cover layer continuously covering the outside of described core cable and described tooth bar by resin, institute

State toothed cable and there is the helical form protuberance being formed because described resin covers described tooth bar and because described resin will be described

The helical form recess covering between tooth bar and being formed, described cover layer and described core cable and described tooth bar contiguity, described spiral

The thickness of the described cover layer of helical form protuberance described in the Film Thickness Ratio of described cover layer of shape recess is thick.

Invention effect

According to the present invention, because toothed cable has cover layer, therefore, it is possible to prevent noise, and due to toothed cable

The bottom of helical form recess is less with the difference at the top of helical form protuberance, therefore will not block with described toothed cable meshed gears

In described helical form protuberance, apply unnecessary load thus without to motor etc..

In addition, the thickness of the bottom by making helical form recess is more than regulation thickness, and it is difficult to generation and nibbles with toothed cable

The engaging-in cut-out causing of the gear closing.

In addition, being in the range of regulation by making the thickness of the bottom of helical form recess, and can suppress and band tooth trace

The cut-out of the engaging-in cover layer causing of cable meshed gears, and can suppress gear engaging-in when stress cause, covering

The situation that cap rock cracks.

In addition, by making below the crooked elastic rate that the resin that cover layer uses is regulation, can reduce further and tooth

The sound that the engagement of wheel produces.

In addition, by making the resin that cover layer is used be thermoplastic elastomer (TPE), cover layer and tooth can be reduced further

The sound that the engagement of wheel produces, and the pressing force to toothed cable during the engaging-in toothed cable of gear can be reduced, one can be entered

Step improves the sliding of toothed cable.

Brief description

Fig. 1 is the partial sectional view of the toothed cable for the present invention is described.

Fig. 2 is the figure of the state representing that the toothed cable of the present invention is engaged with gear.

Fig. 3 is in embodiment and comparative example, measures the sketch of the device of the durability of load, noise and toothed cable of motor.

Fig. 4 is the partial sectional view for conventional toothed cable is described.

Fig. 5 is the partial sectional view for conventional toothed cable is described.

Specific embodiment

Hereinafter, referring to the drawings, explain the toothed cable of the present invention.

As shown in figure 1, the toothed cable 1 of the present invention includes：Core cable 2；The tooth bar 3 helically winding on the outer peripheral face of core cable 2；And the cover layer 4 in the outside (outer peripheral face) of core cable 2 and tooth bar 3 is continuously covered by resin.

As long as core cable 1 has resistance to retractility, resistance to torsion, can use and conventional core cable identical core cable used in toothed cable, although especially its structure is not defined, but for example can be centered on the heart yearn being made up of wires, the enhancement layer that screw winding is made up of many wires, and then the other enhancement layer being made up of many wires in screw winding about, it is consequently formed core cable 1.

It is wound in a spiral in the periphery of core cable 2 and forms tooth bar 3 by separating at equal intervals metal wire rod.Core cable

2 and the outside dimension of tooth bar 3 being not particularly limited, but the outside dimension of such as core cable 2 can use the scope of 1～4mm, the outside dimension of tooth bar 3 can use the scope of 0.5～2mm, and the top outer diameter D4 of tooth bar 3 (top of tooth bar 3 of certain position and imagination be located at this top be the distance between top of tooth bar 3 on axisymmetric position with regard to the axle of toothed cable 1) can be 3～7mm.

Next, the cover layer 4 that explanation uses in the present invention.As shown in figure 1, cover layer 4 is by forming along circumference and the axially consecutive ground covering resin of toothed cable 1 in the outside of core cable 2 and tooth bar 3.The cover layer 4 of toothed cable 1 has：The helical form protuberance 41 being formed by resin is covered in tooth bar 3；And the helical form recess 42 by forming the peripheral part of the core cable 2 between resin covering tooth bar 3.Helical form protuberance 41 is when toothed cable 1 is engaged with gear G (with reference to Fig. 2); sound when preventing the peripheral part of tooth bar 3 from abutting with gear G, the part of the engaging-in toothed cable 1 of tooth T (with reference to Fig. 2) to gear G for the helical form recess 42 is protected.Cover layer 4 as shown in figure 1, from the peripheral part of the peripheral part to core cable 2 for the outer peripheral face of cover layer 4 and tooth bar 3, between do not separate gap, with core cable 2 and tooth bar 3 contiguity setting.

As shown in Fig. 2 covering is pressed by the tooth T of the helical form recess 42 meshed gears G with toothed cable 1

Layer 4.Toothed cable 1 is as the component of the driving force of Transmission gear G, although identical position is repeatedly pressed by tooth T, but due to cover layer 4 and core cable 2 and tooth bar 3 contiguity setting, therefore cover layer 4 will not destroy, therefore, it is possible to be formed as the high toothed cable of durability 1.Further, since cover layer 4 and core cable 2 and tooth bar 3 contiguity setting, therefore, it is possible to prevent noise when engaging with gear G, it is provided between the outer peripheral face in core cable 2 and cover layer 4 compared with the situation in gap, preferably soundproof effect can be played.

In addition, as shown in figure 1, in cover layer 4, the thickness D2 of helical form recess 42 is formed must be thicker than the thickness D1 of helical form protuberance 41.So, the thickness D1 of the cover layer 4 than helical form protuberance 41 for the thickness D2 of the cover layer 4 of helical form recess 42 is thick, thus, the bottom 42a of helical form recess 42 is little with the subtractive of the height of the top 41a of helical form protuberance 41, therefore will not be blocked by helical form protuberance 41 with toothed cable 1 meshed gears G, so unnecessary load will not be applied to driving sources such as the motor of driving gear G.I.e., the thickness D2 of helical form recess 42 is thicker than the thickness D1 of helical form protuberance 41, thus as shown in Figure 2, before and after the tooth T of gear G is engaged with toothed cable 1, it is likely to become the height reduction of the cover layer 4 of the obstacle of track O of the front end of tooth T of the gear G shown in the double dot dash line in Fig. 2, and the tooth T of gear G is also reduced with the contact length of cover layer 4, the therefore tooth T of gear G was shortened with the time of contact of cover layer 4, will not apply unnecessary load to driving sources such as motor.

In addition, if the thickness D1 of helical form protuberance 41 is thick, then on the track O of the front end of the tooth T of gear G, on the top 41a meeting injection O of helical form protuberance 41, therefore cover layer 4 may be reamed because of the leading section of the tooth T of gear G, but in the present invention, because the thickness D1 of helical form protuberance 41 is thinning, the top 41a of therefore helical form protuberance 41 is difficult to cover in rail O.Therefore, can not only reduce the load to motor etc. that the top 41a of the helical form protuberance 41 in cover layer 4 for the front and rear card being engaged in the tooth T of gear G is led to helical form recess 42, and be prevented from cover layer 4 the breakage causing such as ream.Toothed cable 1, in addition to the position engaged with gear G, is inserted shell body (not shown) sometimes, is reamed cover layer 4, and when remaining the fragment after reaming cover layer 4 in shell body, sliding can decline.The the breakage of the toothed cable 1 causing such as ream as a result, it is possible to prevent the decline of the sliding of the toothed cable 1 slided in shell body therefore, it is possible to prevent cover layer 4.

In the bottom 42a of gear G engaging-in helical form recess 42, in order to be difficult to occur cover layer 4 cut-out (cracking,

Breakage etc.) and prevent blocking of toothed cable 1 and meshing gear G, and preferably make the film of the bottom 42a of helical form recess 42

Thick D2 is more than 1.8 times of the thickness D1 of top 41a of helical form protuberance 41.It is more than 1.8 times of thickness D1 by making thickness D2, and can easily suppress the cut-out of the cover layer 4 during the bottom 42a of gear G engaging-in helical form recess 42.The relation of thickness D2 and thickness D1 more preferably makes 1.8～7.4 times that thickness D2 is thickness D1, in order to suppress the engaging-in cut-out causing of gear G, and suppress gear G engaging-in when the situation about cracking in cover layer 4 that causes of stress.This is because, it is less than 7.4 times of thickness D1 by making thickness D2, and can easily suppress the crackle of the front end of the tooth T of the gear G significantly cover layer 4 that engaging-in cover layer 4 causes.

It should be noted that the above-mentioned numerical range certainly bottom from the outer peripheral face of core cable 2 to helical form recess 42

The height of the top 41a from the outer peripheral face of core cable 2 to helical form protuberance 41 for the aspect ratio of 42a is low, and thickness D2 is the scope of 1.8～7.4 times of thickness D1 in addition.In addition, thickness D1 and D2 is sometimes because toothed cable 1 is changed using the abrasion producing, deformation, but the thickness D2 of the present invention is 1.8～7.4 times of thickness D1 refers to the numerical value using front (original state) of toothed cable 1.It should be noted that, thickness D1 and thickness D2 can according to the external diameter of core cable 2, the external diameter of tooth bar 3 and suitably change, but the outside dimension of such as core cable 2 is 2.7mm, when the outside dimension of toothed cable 1 is 4.7mm, thickness D1 can be made to be 0.15～0.4mm, and make thickness D2 be 0.75～1.1mm.In this case, it is D3 with respect to the depth of the paddy being formed between tooth bar 3 and core cable 2, thickness D1 is 0.15～0.4 times of depth of paddy, and thickness D2 is 0.75～1.1 times.

Material as cover layer 4, preferably employ the resin that the crooked elastic rate based on ASTM D790 is below 300MPa, for example, it is preferable to the little synthetic resin of coefficient of friction with flexibility or elasticity using polyester based resin, polyurethane system resin, polyolefin-based resins, fluorine resin, silicone-based resin etc..Wherein, especially from the viewpoint of sound when engaging of toothed cable 1 and gear G, the sliding of the inside the shell of toothed cable 1, as the material of cover layer 4, more preferably thermoplastic elastomer (TPE).In this case, it is possible to use the crooked elastic rate based on ASTM D790 is below 30MPa, the thermoplastic elastomer (TPE) of such as 15～30MPa, can reduce the generation of sound with helical form recess 42 when engaging for the gear G further.When crooked elastic rate is less than 15MPa, the generation of the sound in helical form protuberance 41 cannot be effectively prevented, if crooked elastic rate is more than 30MPa, when then gear G is engaged with toothed cable 1, during the tooth T engaging-in helical form recess 42 of gear G, it is difficult to engaging-in helical form recess 42 deeper it is difficult to driving force is applied to the tooth bar 3 of the inner side of cover layer 4.

By making thickness D2 thicker than thickness D1 and adopting thermoplastic elastomer (TPE) as the material of cover layer 4, the sound of the contact with toothed cable 1 causing so as to the tooth T preventing gear G, and rupture, the breakage of helical form recess 42 can be prevented further, the tooth T of gear G engaging-in with respect to helical form recess 42 because of the elastic deformation of helical form recess 42 and can to toothed cable 1 apply driving force, therefore, it is possible to shorten the time of contact of cover layer 4 and gear G further, the unnecessary load to motor etc. can be mitigated further.In addition, when gear G engaging-in helical form recess 42, can absorb the pressing force for toothed cable 1 in cover layer 4, therefore toothed cable 1 is difficult to be pressed against shell body, it is possible to increase the sliding of toothed cable 1.It should be noted that as cover layer 4, the cover layer 4 that the solid constituent of resinous principle be made up of is usually used but it is also possible to use the resin having foamed.

Claims (5)

1. a kind of toothed cable, possesses core cable and the tooth bar helically winding in the periphery of described core cable, described band tooth

Cable is characterised by, there is the cover layer continuously covering the outside of described core cable and described tooth bar by resin, described toothed cable has the helical form protuberance being formed because described resin covers described tooth bar and the helical form recess being formed covering between described tooth bar due to described resin, described cover layer and described core cable and described tooth bar contiguity, the thickness of the recessed described cover layer of helical form protuberance described in the Film Thickness Ratio of described cover layer of described helical form is thick.

2. toothed cable according to claim 1 is it is characterised in that the thickness of the bottom of described helical form recess is more than 1.8 times of the thickness at top of described helical form protuberance.

3. toothed cable according to claim 1 is it is characterised in that the thickness of the bottom of described helical form recess is 1.8 times～7.4 times of the thickness at top of described helical form protuberance.

4. the toothed cable according to any one of claims 1 to 3 is it is characterised in that the crooked elastic rate of described resin

For below 300MPa.

5. the toothed cable according to any one of claims 1 to 3 is it is characterised in that described resin is thermoplastic elastic

Body.