JP4678179B2 - Chain belt - Google Patents

Description

  The present invention relates to the technical field of transmission chain belts for transmitting torque. More specifically, the link plate is endlessly formed by pins so as to be wound around two pulleys arranged in parallel shafts to transmit torque between the pulleys. The present invention relates to the technical field of chain belts of linked type.

  Conventionally, for example, in a continuously variable transmission (CVT), two pulleys arranged in parallel shafts (in this specification, a torque input side is a primary pulley, a torque output side is a secondary pulley, and both pulleys are simply referred to as a pulley) There is used an endless chain belt that is stretched between the two and transmits torque from the primary pulley to the secondary pulley.

  As an example of this type of chain belt, there is a chain belt formed by using a large number of link plates and connecting adjacent link plates so as to be rotatable relative to each other by a joint which is an elongated connecting / engaging member. Are known. The chain belt is wound around the pulley by intermittently engaging the joint with the pulley wall surface, and the belt advances to transmit the torque.

  In this way, in the type in which torque is transmitted by the joint contacting the pulley wall, the joint periodically contacts the pulley, so that noise is generated by vibration due to the contact impact each time the joint contacts the pulley. . It is known that this noise has a peak in the frequency corresponding to the period in which the joint contacts the pulley wall (the reciprocal of the period) and the harmonic frequency. This is considered to be caused by the vibration of the pulley and the belt itself that becomes a vibration source in which a periodic impact on the pulley due to the contact of the joint occurs.

Therefore, for example, in a chain belt having a joint, it has been proposed to set the joint interval in the belt running direction (hereinafter referred to as a pitch) to different lengths and to disperse the period in which the joint contacts the pulley wall into a plurality of lengths. (For example, refer to Patent Document 1). In addition, it has been proposed to reduce noise by using joints having different lengths in the belt width direction to make the time interval at which the joints contact the pulley wall non-uniform (see, for example, Patent Document 2).
JP-A-10-122307 (Claim 45). JP-A-63-53337 (Claim 1).

  The noise reduction methods disclosed in Patent Documents 1 and 2 described above both make the period in which the pin contacts the pulley wall irregular, so that the noise peak frequency is dispersed, but the noise itself is suppressed. Therefore, it is not enough to reduce the overall noise.

Therefore, the present applicant uses a long link having a long length and a short link having a short length for the link plate, and by combining these long links and short links, the timing at which the joint engages with the pulley is shifted, and Proposed and patent-pending a chain belt that can suppress vibrations of pulleys and belts by combining vibration waves generated when engaged with pulleys, thereby reducing noise (patent application) 2004-295900 ; JP-A-2006-105355 ).

  By the way, in the chain belt as described above, since many link plates are connected, when one link plate is wound around a pulley and rotated, this link plate is compared with the link plate before being wound around the pulley. When the link plate rotates together with the pulley, the link plate bends relative to the link plate before being wound around the pulley. When the link plate bends as described above, the stress at the time of bending the link plate increases.

  When a long link having a relatively long length is used like the chain belt of the aforementioned patent application, when the long links are continuously connected in the belt traveling direction, the above-mentioned bending angles of the long links are the same. This is larger than the case where a short link is interposed between a number of long links. For this reason, when many long links are continuously connected in the belt traveling direction, there is a problem that the stress generated when the long links are bent increases and affects the durability of the chain belt. .

  The present invention has been made in view of such circumstances, and an object of the present invention is to reduce the noise while suppressing the vibration of the pulley and the belt by shifting the timing at which the joint engages with the pulley, and the long link. It is an object of the present invention to provide a chain belt capable of preventing the durability of the chain belt from deteriorating due to an increase in stress due to the addition of the above.

In order to solve the above-mentioned problem, the chain belt of the invention of claim 1 is a chain belt in which a large number of annular link plates and adjacent link plates are connected to each other in the belt traveling direction so as to be relatively rotatable. When the two pulleys are wound around the two pulleys, both ends of the multiple joints sequentially engage with the pulley wall surfaces of the two pulleys, respectively. In the endless chain belt that transmits torque between the pulleys by transmitting the torque to the other pulley, the link plate is composed of a long link having a long length and a short link having a shorter length than the long link. , the long link, b Ngurin click Contact and each end portion each other that both end portions are relatively rotatably coupled to the short link Pairs rotatably coupled and connected to two or consists long links, or each one end to each other are connected to be relatively rotatable and the short link each other end to each of the short link each other end, respectively It is characterized in that there are two long links connected to each other and at least one of the two long links connected to each other .

The chain belt of the invention of claim 2 is provided with a plurality of plate sets in which the plurality of annular link plates are aligned in a direction perpendicular to the belt traveling direction, and the plate set is a first predetermined number. The first and second link plates are arranged in a direction perpendicular to the belt traveling direction, and a second predetermined number of the link plates are arranged in a direction perpendicular to the belt traveling direction. In addition, a plurality of the first plate sets and a plurality of the second plate sets are alternately arranged in the belt traveling direction and connected endlessly, and the plate set is a long link plate of the first plate set. link before one or consists Symbol second plate sets of link plates is composed of a short link, said first plate set is, both end portions of the long plate Each other end of the serial second plate sets of the end portions of the first plate set and each other the long plate is relatively rotatably connected to a short link is relatively rotatably connected and the long plate each first Two first plate sets connected to the short links of the two plate sets, or one end portions of the long plate are connected to each other so as to be relatively rotatable, and the other end portions of the long plates are respectively connected to the short links. The first plate set includes two first plate sets connected to the short links of the second plate set, and there is at least one first plate set to which the long links are connected to each other .

According to the chain belt of the present invention configured as described above, the short link and the long link are combined to form an endless chain belt, and the long link can be rotated relative to the short link at both ends. or each end with one another and contact one Rongurin click coupled consists of relatively rotatably coupled and two long links each other end is connected to a short link, respectively, or each one end portion rotatable relative to each other And two other long links connected to each other, and at least one long link connected to each other . Therefore, three or more long links are not continuously arranged in the belt traveling direction over the entire circumference of the endless chain belt. Thus, as in the invention of the above-mentioned patent application by the present applicant, the timing at which the joint engages with the pulley is shifted by combining the long link and the short link, and the vibration wave generated when the joint is engaged with the pulley is reduced. By synthesizing, vibrations of the pulley and chain belt can be suppressed and noise can be effectively suppressed. Moreover, the long link, one Rongurin click Contact and each end with one another is relatively rotatably connected and the other end of both end portions are relatively rotatably connected to a short link is connected to a short link, respectively 2 Or two long links each having one end connected to each other in a relatively rotatable manner and each other end connected to a short link, and at least two long links connected to each other. Since the stress is reduced by the presence of one , the durability of the chain belt can be improved.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a partial side view showing a part of a chain belt according to an example of an embodiment of the present invention, and FIG. 2 is a partial plan view showing a part of the chain belt as viewed from the outer peripheral side.
As shown in FIGS. 1 and 2, the chain belt 1 of this example is used in a belt-type power transmission device such as a belt-type continuously variable transmission, and is formed in an endless shape. The chain belt 1 is stretched between a primary pulley (not shown) and a secondary pulley (not shown) arranged on parallel axes, and proceeds in a belt traveling direction α indicated by an arrow in FIG. 1, that is, rotates clockwise. By doing so, torque is transmitted from the primary pulley to the secondary pulley. FIG. 1 shows a portion where a transmission chain belt 1 formed in an endless shape is wound around a primary pulley.

  And both pulley wall surfaces (also FIG. 3A) of a pair of sheaves (corresponding to a pair of sheaves 10a, 10b of the pulley 10 shown in FIGS. 3A and 3B described later) constituting the primary pulley. And a pair of sheaves constituting the secondary pulley (also shown in FIGS. 3A and 3B) when the distance between the pair of sheaves 10a and 10b shown in FIG. The opposite pulley wall surfaces of the pair of sheaves 10a and 10b of the pulley 10 shown (also corresponding to the pulley wall surfaces 10c and 10d of the pair of sheaves 10a and 10b shown in FIGS. 3A and 3B) When the distance between the opposing pulley wall surfaces of the pair of sheaves constituting the primary pulley becomes smaller, the pair of sheaves constituting the secondary pulley becomes smaller. So that the distance between the pulleys opposed wall surfaces of the probe is increased, by synchronously controlling the spacing between the pulleys wall of each of the pulleys, stepless shift is performed. In the following description, when it is common to the primary pulley and the secondary pulley, it is simply referred to as a pulley.

  The chain belt 1 includes a large number of link plates 2 and a large number of joints 3 that endlessly connect adjacent link plates 2 in a belt traveling direction α so as to be relatively rotatable with respect to each other. Each joint 3 is composed of a strip-like torque transmission pin 4 and a strip-like strip pin 5 having the same length in the direction (vertical direction in FIG. 2) perpendicular to the belt traveling direction α. Each link plate 2 is interposed between a first plate set 6 composed of five link plates 2 aligned in a direction orthogonal to the belt traveling direction α and the link plate 2 of the first plate set 6. The second plate set 7 including the four link plates 2 is provided and provided.

  The first plate sets 6 and the second plate sets 7 are alternately arranged in the belt traveling direction α. In that case, the belt traveling direction front side portion 2f of each link plate 2 of the first plate set 6 and each link plate 2 of the second plate set 7 adjacent to the first plate set 6 on the downstream side in the belt traveling direction. A part of the rear end 2r is overlapped in a direction orthogonal to the belt traveling direction α, and the belt traveling direction rear end 2r of each link plate 2 of the first plate set 6 and the first plate set 6 A part of each link plate 2 of the second plate set 7 adjacent to the upstream side in the belt traveling direction is overlapped with the belt traveling direction front side portion 2f in the same manner.

  The joint 3 is penetrated in a direction orthogonal to the belt traveling direction α in each hole 8, 9 formed in the overlapping portion of each link plate 2 of the first plate set 6 and each link plate 2 of the second plate set 7. ing. In that case, the joint 3 is arranged so that the torque transmission pin 4 is located behind the strip pin 5 (upstream side in the belt traveling direction).

  Both ends 4a, 4b of the torque transmission pin 4 of the joint 3 and both ends 5a, 5b of the strip pin 5 are respectively opposed to the pair of sheaves 10a, 10b of the pulley 10 as shown in FIGS. 3 (a) and 3 (b). The pulley walls 10c and 10d have the same inclination angles as the inclination angles. Both ends 4a and 4b of the torque transmission pin 4 and both ends 5a and 5b of the strip pin 5 are contact ends that contact the wall surfaces 10c and 10d of the pulley 10, respectively.

  As shown in FIGS. 1 and 2, the torque transmission pin 4 and the strip pin 5 have their opposing surfaces 4c and 5c each having an arcuate surface and are always in contact with each other. The strip pin 5 rolls relatively on the opposing surfaces 5c, 4c of each other.

Each link plate 2 of the first and second plate sets 6 and 7 has a length of one link plate 2 (more precisely, one link plate as shown in FIGS. 4A and 4B, for example). 2, a link plate 2 having a short length L _S (hereinafter also referred to as a short link) 2 _S and a length L _L having a long link plate 2. Link plate (hereinafter also referred to as long link) 2 _L. In the state shown in FIGS. 4A and 4B, each link plate 2 of the left first plate set 6 is a short link 2 _S , and each link plate 2 of the center second plate set 7 is a long link 2. _L and each link plate 2 of the first plate set 6 on the right side is a short link 2 _S. 1 and 2, each link plate 2 is not shown as a short link 2 _S or a long link 2 _L.

The chain belt 1 of the present invention, in that the first plate assembly 6 are shown in FIGS. 4 (a) and (b) a short link 2 _S, and the second plate assembly 7 is long links 2 _L never that will be limited, consisting shortlink 2 first plate pair 6 consisting of _S, the first plate pair 6 consisting of long links 2 _L, the short link 2 second plate group 7 consisting of _S, and the long link 2 _L The second plate set 7 is configured by being appropriately combined so as to suppress the bending angle of the link plate 2 from increasing as much as possible.

  The bending angle of the link plate 2 is given by the sum of the angles of the link plate 2 connected to the front and rear of the central link plate 2 with respect to the central link plate 2 in the three consecutive link plates 2. This bending angle is obtained.

Now, as shown in FIG. 5 (a), three continuous first link plates 2 _-1 , second link plates 2 _-2 and third link plates 2 _-3 are wound around the pulley 10, respectively. Suppose that First link plates 2 _-1 at both ends of the joint 3 _-1-0, 3 the distance between _-2-1 (i.e., the link length of the plate 2 ₁₎ was as L _1, and each joint 3 _-1-0 , 3 _-2-1 turning radius is R, and further the first link plate 2 _-1 at both ends of the joint 3 _-1-0, 3 and perpendicular bisector of a straight line connecting _-2-1, these joint 3 _-1-0, 3 _-2-1 and the angle which the straight line and forms connecting the center of rotation and the respective pulleys 10 and theta _1, further Similarly, the second and third link plates 2 _-2, 2 _-3 Where θ ₂ and θ ₃ are similar angles with respect to, the angle θn corresponding to the nth link plate 2 _-n is
θn = sin ⁻¹ [(Ln / 2) / R] (n = 1, 2, 3,...)
Given in. As is clear from this equation, the angle θn increases as the length Ln of the link plate 2 increases. Therefore, if the angles θn of the long link 2 _L and the short link 2 _S are θ _L and θ _S , respectively, θ _L > θ _S.

Then, the bending angle gamma of the second link plates 2 _-2, the first link plate 2 _-1 angles gamma ₁ and the third link plates 2 _-3 forms with respect to the second link plates _2-2 It is given by the sum (γ = γ ₁ + γ ₂ ) with the angle γ ₂ formed with respect to the second link plate 2 _-2 . Also, the angles γ ₁ and γ ₂ are respectively γ ₁ = θ ₁ + θ ₂
γ ₂ = θ ₂ + θ ₃
Given in. Therefore, the bending angle γ is
γ = γ ₁ + γ ₂ = θ ₁ + 2θ ₂ + θ ₃
Given in.

When the three consecutive link plates 2 are all configured by the long link 2 _L , the bending angle γ is
γ = γ ₁ + γ ₂ = θ _L + 2θ _L + θ _L = 4θ _L
It becomes. Therefore, the bending angle γ when three consecutive long links 2 _L are configured is the case where the three consecutive link plates 2 are all configured by the short links 2 _S or the long links 2 _L and the short links 2. Compared to the case of _S , it is the maximum.

When the bending angle γ increases, both the stress and the stress amplitude during bending increase, and the durability of the chain belt 1 is affected by the increase in the bending angle γ. Then, various simulation analyzes were performed on the desirable number of connections to which the long links 2 _L can be connected continuously so that the durability of the chain belt 1 is not affected.

As analytical conditions, a short link 2 _S the length L _S 8 mm, the long links 2 _L the length L _L 9.6 mm, the contact of the pulley 10 of the joint 3, 55 mm turning radius R of the engagement points, primary The number of revolutions of the pulley was 2,000 rpm and the torque ratio was 1.0.
At this time, the angle theta _S for short link 2 _S is 4.17 degrees, the angle theta _L for long links 2 _L is 5.00 degrees. In addition, the bending angle γ is 20 degrees at the maximum when the long link 2 _L has three consecutive links, and when the long link 2 _L has two consecutive links (2 _L −2 _L −2 _S or 2 _S −2 _L − 2 _L ) is a maximum of 19.17 degrees (a 4.2% decrease compared to the case where 3 long links 2 _L exist), and the case where the long link 2 _L does not exist (2 _L −2 _S −2 _L). Or 2 _S -2 _L -2 _S ) is 19.17 degrees at the maximum (a decrease of 8.3% compared to the case where there are three long links 2 _L ).

The analysis results are shown in FIG. 6A for the maximum stress, FIG. 6B for the maximum stress amplitude, and FIG. 7 for the peak noise.
As shown in FIG. 6 (a) and (b), 3 if there is no continuous long links L _L, as compared to the case where there are three consecutive long links L _L, with maximum stress decreases approximately 3% maximum stress It was found that the amplitude decreased by about 2%.
In addition, as shown in FIG. 7, the noise level is almost the same when the long link L _L is 3 continuous and when the long link L _L is 2 continuous, and when the long link L _L is not continuous. Compared to the case where the long link L _L has three continuous lines, the deterioration was about 2 dB.

From the above, in the chain belt 1 of this example, three or more long links 2 _L are not continuously arranged in the belt traveling direction. In this case, in the chain belt of the present invention, the fact that three or more long links 2 _L are not continuously arranged in the belt traveling direction means that the first plate set 6 including the five long links 2 _L as described above or In the case of the second plate set 7 composed of four long links 2 _L , it means that three or more sets of long links 2 _L are not continuously arranged in the belt traveling direction.

The operation of the thus configured chain belt 1 of this example will be described.
First, the chain belt 1 is wound around a primary pulley and a secondary pulley arranged on parallel shafts. When the primary pulley is rotated clockwise, the joint 3 (the torque transmission pin 4 and the strip pin 5) is brought into contact with and engaged with the pulley wall surfaces 10c and 10d from the pulley wall surfaces 10c and 10d of the pulley 10. Is transmitted to. Then, the joint 3 rotates around the rotation center of the primary pulley as the primary pulley rotates. At this time, the torque transmission pin 4 and the strip pin 5 of the joint 3 roll relative to each other. The rotation of the joint 3 presses the front side portion 2f of the link plate 2 in the belt traveling direction. As a result, the link plate 2 tends to rotate in the same direction, so the rear side portion 2r of the link plate 2 in the belt traveling direction presses the torque transmission pin 4 in contact with the link plate 2 in the same direction. Therefore, as described above, the torque transmission pin 4 presses the belt traveling direction front side portion 2f of the link plate 2 connected adjacently to the link plate 2 on the upstream side in the belt traveling direction via the strip 4. In this way, the link plates 2 are sequentially pressed, so that the chain belt 1 rotates clockwise.

  When the chain belt 1 rotates clockwise, torque is transmitted to the secondary pulley from the joint 3 that contacts both pulley wall surfaces of the secondary pulley, and the secondary pulley rotates clockwise. Thus, torque is transmitted from the primary pulley to the secondary pulley via the chain belt 1 and output from the secondary pulley. At this time, torque is transmitted at a torque ratio based on the pitch radius of the chain belt 1 wound around the primary pulley and the pitch circle radius of the chain belt 1 wound around the secondary pulley.

In this way, according to the chain belt 1 of this example, the long belt 2 _L having a long length and the short link 2 _S having a short length are combined to form the chain belt 1 and the long link 2 _L is made of 3 Since the belts are not arranged in the belt traveling direction continuously, the joint 3 is formed by combining the long link 2 _L and the short link 2 _{S in the same} manner as the invention of the aforementioned patent application by the applicant. The timing of engaging with the pulley 10 is shifted, and the vibration wave generated when the joint 3 and the pulley 10 are engaged is combined to suppress the vibration of the pulley 10 and the chain belt 1, thereby causing unpleasant noise peaks (noise). It is possible to improve the durability of the chain belt 1 by effectively suppressing the maximum stress and the maximum stress amplitude while allowing the chain belt 1 to be effectively suppressed. You can. The vibration suppression of the pulley 10 and the chain belt 1 by the combination of the long link 2 _L and the short link 2 _S is described in the specification and drawings of the aforementioned patent application, and can be easily understood by referring to them. Detailed description thereof will be omitted.

  In the above-described example, the axial length of the torque transmission pin 4 of the joint 3 and the axial length of the strip pin 5 are the same, and both ends 4a, 4b of the torque transmission pin 4 and both ends 5a, 5b is configured so that the pulley wall surfaces 10c and 10d are in contact with and engaged with each other. However, the present invention is not limited to this. For example, as shown in FIG. The length is made shorter than the axial length of the torque transmission pin 4, and both ends 4a and 4b of the torque transmission pin 4 are brought into contact with and engaged with the pulley wall surfaces 10c and 10d, but both ends 5a and 5b of the strip pin 5 are It is possible to prevent the pulley wall surfaces 10c and 10d from coming into contact or engaged with each other.

  In this way, the torque transmission pin 4 becomes a strength member because a force acts between the torque transmission pin 4 and the pulley 10 when both ends 4a and 4b come into contact with the pair of pulley wall surfaces 10c and 10d. However, the strip pin 5 is not a strength member because its both ends 5a and 5b do not contact the pair of pulley wall surfaces 10c and 10d, so that no force acts between the strip pin 5 and the pulley 10. Therefore, the thickness of the strip pin 5 can be reduced, and the pitch of the link plate 2 can be reduced.

  In the above-described example, the first plate set 6 is provided with five link plates 2 and the second plate set 7 is provided with four link plates 2, but the first and second plates The number of link plates 2 provided in each of the sets 6 and 7 can be arbitrarily set. In this case, the number of link plates 2 provided in the second plate set 7 is set to be the same or less than the number of link plates 2 provided in the first plate set 6.

  The chain belt of the present invention can be suitably used for a belt type power transmission device of various machines for transmitting torque between a belt and a pulley, including a belt type continuously variable transmission for a vehicle such as an automobile.

It is a partial side view which shows a part of chain belt which concerns on an example of embodiment of this invention. FIG. 2 is a partial plan view showing a part of the chain belt shown in FIG. 1 as viewed from the outer peripheral side. FIG. 2 shows contact and engagement states of the chain belt joint and pulley shown in FIG. 1, (a) is a plan view, and (b) is a view seen in the belt traveling direction. A part of example in the chain belt of this invention which has a link plate which consists of a long link and a short link is shown, (a) is a partial side view, (b) is a partial top view. The winding operation of the link plate around the pulley will be described. (A) is a diagram showing a state in which the first link plate is rolled up, and (b) is a diagram showing a state in which the next link plate is rolled up. The analysis result of the stress when the three long links are connected continuously and the case where the three long links are not connected continuously are shown, (a) shows the analysis result of the maximum stress, (b) These are figures which show the analysis result of the maximum stress amplitude. It is a figure which shows the analysis result of the noise level in the case where three long links are connected continuously, and the case where three long links are not connected continuously. The modification of the chain belt of this invention is shown, (a) is a partial top view corresponding to Fig.4 (a), (b) is a partial top view corresponding to FIG.4 (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Chain belt, 2 ... Link plate, _2L ... Long link, _2S ... Short link, 3 ... Joint, 4 ... Torque transmission pin, 5 ... Strip pin, 6 ... 1st plate group, 7 ... 2nd plate group DESCRIPTION OF SYMBOLS 10 ... Pulley, 10a, 10b ... Sheave, 10c, 10d ... Pulley wall surface, (alpha) ... Belt moving direction, (gamma) ... Bending angle

Claims (2)

A plurality of annular link plates and a plurality of joints that endlessly connect the adjacent link plates to each other in the belt moving direction so as to be rotatable relative to each other. Both ends of each of the two pulleys are sequentially engaged with the pulley wall surfaces of the two pulleys, and the force is transmitted from one pulley and the force is transmitted to the other pulley, thereby transmitting torque between the pulleys. In the shape of a chain belt,
The link plate is composed of a long link having a long length and a short link having a shorter length than the long link,
The long link 2 having both ends the short link each end with one another and our relatively rotatably linked b Ngurin click on is relatively rotatably connected and the other end portion is connected to the short link, respectively Consisting of two long links , or two long links each having one end connected to each other in a relatively rotatable manner and each other end connected to the short link,
A chain belt comprising at least one two long links connected to each other . A plurality of plate sets in which the plurality of annular link plates are aligned in a direction perpendicular to the belt traveling direction;
The plate set includes a first plate set in which a first predetermined number of the link plates are aligned in a direction perpendicular to the belt traveling direction and a second predetermined number of the link plates in a direction orthogonal to the belt traveling direction. And a plurality of the first plate sets and a plurality of the second plate sets are alternately arranged in the belt traveling direction and connected endlessly,
Said plate assembly, the first plate set of link plates is composed of a long link or One prior Symbol second plate sets of link plates is composed of a short link,
The first plate set includes a first plate set in which both end portions of the long plate are connected to a short link of the second plate set so as to be relatively rotatable, and one end portions of the long plate are connected to each other so as to be relatively rotatable. And each of the other end portions of the long plate is composed of two first plate sets connected to the short link of the second plate set, or each end portion of the long plate is relatively rotatable. The first plate set is connected and each other end portion of the long plate is connected to the short link of the second plate set.
The chain belt according to claim 1, wherein there is at least one first plate set having two long links connected to each other .

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