JPH0579854B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a block belt and a method for manufacturing the same. A block body is fixed to a belt over its entire length at a predetermined pitch, and is used as a component of continuously variable transmission devices installed in automobiles, motorcycles, agricultural machinery, etc., and the manufacturing method of the belt is The present invention mainly relates to a method for fixing a block body of a center belt as a core body.

(Prior Art) Conventionally, a pair of upper and lower blocks are placed on both the front and back surfaces of a center belt made of a belt-shaped elastic body in which tensile material is embedded, and the blocks are placed at predetermined pitches over the entire length of the center belt. A block belt is known in which the

In this type of block belt, the joint between the center belt, which has good flexibility, and the block body, which is highly rigid, is an important point in terms of power transmission, maintenance of durability, and belt manufacturing. A large shearing force acts between the block body and the center belt during torque transmission, and the power transmission force of the block belt is greatly influenced by the adhesion force at this joint, and the durability of the belt depends on the durability of this joint. It can be said that it depends on the gender. Further, the complicated joining of the center belt and the block body increases the cost and results in a lack of versatility.

The means for fixing the center belt and the block body is to insert bolts or rivets into through holes that communicate with the block body and the center belt and fix them, or to fix them by inserting two bolts or rivets into grooves provided on both sides of the block body. A fixing method of inserting a flat belt (for example, Japanese Utility Model Application Publication No. 175334/1983) has been proposed.

(Problems to be Solved by the Invention) Although it is true that the conventional fixing means using bolts or rivets can achieve strong fixing, this requires the drilling of through holes in the center belt and block body. There is a big problem in drilling this through hole, especially in the center belt, as the presence of this hole reduces the strength of the belt itself.
In addition, a series of operations are required, such as drilling a through hole, inserting a bolt or rivet, and then tightening a nut or caulking the tip of the rivet, and these multi-step processes require a lot of effort in manufacturing the belt itself. This results in increased costs.

In addition, the fixing means for fitting the two center belts into grooves provided on both sides of the block body leaves concerns about the fixing points between the block body and the center belt.
Pressing the center belt into the groove of the block body requires more effort than expected.

The object of this invention is to provide a block belt that maintains sufficient durability against the strong shearing force that acts between the block body and the center belt during torque transmission, and that is easy to manufacture. There is.

(Means for Solving the Problems) In order to achieve the above object, the block belt according to the present invention includes a flat belt-shaped center belt in which a tensile member is embedded, and a pair of belts arranged at a predetermined pitch on both sides of the center belt. It is composed of a block body consisting of a combination of block pieces. The contact surface between the center belt and the block piece is assembled by a fitting means with a convex piece on one side and a groove into which it fits on the other side, and the periphery of the block body with the center belt as the core is The block body is fastened to the center belt by means of fastening the body wrap by fitting a part of the metal linear fastening member into the longitudinal grooves provided on both side walls of the pair of block pieces constituting the center belt. is fixed as a core.

The top surface of one block piece of the block body has a gentle V-shape, and both ends of the linear fastening member in the form of a body wrap are bent into a V-shape along this V-shaped top surface. It is characterized by

In addition, the method for manufacturing a block belt according to the present invention uses a center belt with a tensile member embedded as a core body, and arranges a pair of blocks on both sides at a predetermined pitch, so that the contact surface between the center belt and each block piece is A block body is formed by a fitting means in which a convex piece is provided on one side and a groove is provided on the other side. Further, a part of a linear U-shaped fastening member made of metal and approximately matching the outer shape of the block body is fitted into the vertical grooves provided on at least both side walls of the block pieces constituting the block body, The belt block body portion is temporarily tightened into a body wrap shape using a fastening member that leaves inwardly bent portions provided at both ends. The block body is fitted into a receiving tool constituting one of the caulking tools, leaving the inwardly bent portion, and then the inwardly bent portion is pushed toward the block body using the other pushing tool of the caulking mold tool. The block body is fastened and fixed to the center belt surface by pressing and bending.

In addition, a gentle chevron-shaped pushing strip is formed on the pushing side tool of the caulking mold tool, and the pushing strip allows the pair of inwardly halfway bent portions to be bent along the V-shaped top surface of the block body. The halfway bent portion is bent and fixed in a V-shape that bites into the back surface of the belt.

(Embodiments) Next, specific embodiments of the block belt according to the present invention will be described with reference to the drawings.

Fig. 1 is a front view of a part of a block belt embodying the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a perspective view showing an exploded state of the block body. .

The block belt 1 has a flat belt-like center in which a low-elongation, high-strength rope tensile material 4 made of glass fiber, aramid fiber, polyamide fiber, polyester fiber, wire, etc. is embedded in a band-like rubber-like elastic material 3. A block body 5 having an inverted trapezoidal cross section is formed by arranging a pair of upper block pieces 5a and a lower block piece 5b at relative positions on both sides of the belt 2, and combining the pair of block pieces 5a and 5b. The group consists of a structure in which the groups are fixed at predetermined pitches over the entire length of the center belt 2.

The rubber-like elastic body 3 that constitutes the center belt 2 is
The block body 5 is made of rubber or polyurethane resin made of a single material of NR, SBR, CR, or NBR or a blend of these materials, while the block body 5 is made of hard rubber with greater rigidity than the center belt 2, specifically, hard rubber with a hardness of 90° or more. Hard polyurethane resin, phenolic resin, epoxy resin, nylon resin, polyester resin,
It is made of resin such as acrylic resin or methacrylic resin, or a reinforced resin in which short fibers such as cotton yarn, chemical fiber, glass fiber, metal fiber, etc. are mixed into the resin material.

Next, when arranging the upper and lower block pieces 5a and 5b on both sides of the center belt 2, the contact surfaces between the center belt 2 and the upper and lower block pieces 5a and 5b, that is, both sides of the center belt 2 are Convex pieces 7, 7 extending in the belt width direction are formed on the contact surfaces of both block pieces 5a, 5b with the center belt 2, and concave grooves 8 that fit tightly with the convex pieces 7 are formed on the contact surfaces of both block pieces 5a, 5b. Of the block pieces 5a and 5b, at least the block pieces located on both side edges of the center belt 2 have vertical grooves on both side wall surfaces thereof that are deep enough to allow a metal linear fastening member 14 to be completely buried therein. 10, 10 are formed, and the entire back surface forming the widest area of the particularly wide inverted trapezoidal upper block piece 5a forms a gentle V-shaped top surface 12. If necessary, a relay groove continuous with the vertical groove 10 may be formed in the bottom surface of the lower block piece 5b, which is also in the shape of an inverted trapezoid and has a width smaller than that of the upper block piece 5a.

The convex pieces 7 provided on both sides of the center belt 2 fit into the grooves 8 of the pair of block pieces 5a, 5b, and the center belt 2 is held between the pair of block pieces 5a, 5b. Note that the convex piece 7 and the concave groove 8
It is also possible to replace the forming part depending on the location.
The block body 5 assembled with the pair of block pieces 5a and 5b has a fastening member 14 constituted by a substantially U-shaped metal wire member that substantially matches the outer peripheral shape of the block body 5. , its central part 1
5 to the bottom of the lower block piece 5b, if there is a relay groove in the bottom, fit into the groove, and further insert the member 1.
4. Fit the rising portion 16 extending from the central portion 15 into the vertical grooves 10, 10 provided on the side wall surfaces of the lower block piece 5b and the upper block piece 5a, respectively, and then insert the inwardly bent portions 17, 17 at both ends into the upper block piece. The block body 5 disposed on both sides of the center belt 2 along the V-shaped top surface 12 of the block body 5a is fastened and fixed in the shape of a waistband with the center belt 2 as a core body using the linear fastening member 14. . Linear fastening member 1
4, the pair of block pieces 5a, 5b are fixed to the center belt 2 by utilizing the inherent elasticity of both structural members, so that the fastening force is strong. The bent portions 17, 17 are the V-shaped top surface 1 of the upper block piece 5a.
By applying a bending force along the two parts in a deep V-shape, the fastening member 14 can be fixed in place even more reliably and strongly.

Next, the method for manufacturing the block belt according to the present invention will be explained in detail. Figure 4 is a front view of the fastening member before tightening work, Figure 5 is an exploded perspective view of the receiving and pushing tools that make up the crimping tool, and Figure 6 is manufacturing of the block belt in the crimping tool. FIG. 7, a central longitudinal sectional view showing the process, corresponds to FIG. 6 immediately after the block belt has been tightened.

First, the convex piece 7 and the groove 8 formed on the mutual contact surfaces of the center belt 2 and the pair of upper and lower block pieces 5a, 5b are fitted, and the block pieces 5a, 5b arranged on both sides of the center belt 2 are fitted. Thus, a block body 5 having the center belt 2 as a core body is formed. A metal U-shaped linear fastening member 14, shown as an example in FIG. 4, is prepared in advance and substantially matches the outer circumference of the block body 5 including the assembled center belt 2. Near both ends of this fastening member 14, there are points 18, 18 that leave portions corresponding to the inwardly bent portions 17 along the V-shaped top surface 12 of the block belt.
At this point, they are slightly bent slightly inward from each other to form a halfway bent portion 17'.

A pre-assembled block part of the belt is inserted into the deep part of the U-shaped fastening member 14 from the narrow lower block piece 5b side, and the rising part 16 of the fastening member 14 is inserted into both the upper and lower block pieces 5a. , 5b, the member 14 is fitted into the vertical groove 10 provided on both side walls of the belt in such a manner that it is completely buried in the groove. Assembly is complete.

At this time, the points 18, 18 forming the halfway bent part 17' of the fastening member 14 approximately coincide with the upper corner part of the upper block piece 5a constituting the block belt 1, and the fastening member 14 is fastened to the block body 5. Temporary fixation of the member 14 becomes reliable, and subsequent caulking work of the fastening member becomes easy. Reference numeral 22 denotes a receiving tool forming one side of the caulking tool 21, and the receiving tool 22 is formed with a fitting portion 23 that can tightly fit into the block body portion of the block belt which has been temporarily assembled. Vertical protrusions 23' are provided on both sides of the fitting portion 23 to fit into the longitudinal grooves 10 of the block body 5, respectively, and to prevent the pair of rising portions 16, 16 of the fastening member 14 from expanding in the lateral direction. is erected. Also 2
4 is a pushing side tool forming the other side of the caulking mold tool 21;
The inner surface of this pushing side tool 24 combined with the receiving side tool 22 is formed with a mountain part 26 that shallowly fits into the fitting part 23 of the receiving side tool 22 and whose central part gradually rises from both sides. Push strips 25 each having a series of gently curved guide surfaces 26 are protruded from both sides of the hem.

In the caulking tool 21 having the above configuration,
The block part of the belt with the fastening member 14 attached thereto is fitted into the fitting part 23 of the receiving tool 22, leaving inwardly bent parts 17', 17' formed at both ends of the fastening member. Next, the pushing side tool 24 is placed opposite to the receiving side tool 22, and the halfway bent portions of both ends of the fastening member 14 are positioned on the curved guide surfaces 27, 27 provided on both side hem portions of the pushing strip 25 of the pushing side tool 24, The distance between the receiving side tool 22 and the pushing side tool 24 is gradually brought closer, and the halfway bent portion 1 near both ends of the fastening member 14 is
Along with this, the bending degree of 7' deepens, and finally, by the complete bending operation of the fastening member 14 by the crest 26 of the pushing strip 25, a pair of halfway bent parts 1 are formed.
7' and 17' are the V-shaped top surfaces 12 of the upper block piece 5a.
The pair of block pieces 5a and 5b are bent deeply into a V-shape along the center belt, thereby realizing a firm wrap-like fixation of the pair of block pieces 5a and 5b to the center belt surface, which is most desired as a fastening member.

In this invention, by attaching the fastening member 14 and arranging the crimping tool 21 for each block 5 of each block belt that has been temporarily fastened and assembled, the production of block belts centered on this fastening work can be carried out. It can be made efficient and quick.

(Effects of the Invention) The block belt according to the present invention has a pair of block pieces arranged on both sides of a flat belt-like center belt serving as a core material, and when fixing this, the center belt and the pair of block pieces are fixed. By providing a convex piece and a corresponding concave groove on each contact surface and fitting these pieces together, vibration between the two members is suppressed.Furthermore, the belt pieces are arranged in a body wrap around the center belt and the pair of block pieces. By tightening the fastening members, the fixation of each component of the belt becomes even stronger, and it exhibits strong durability, especially against the shearing force that acts between the center belt and the block pieces when the belt is running. Compared to bolting, riveting, etc., which were conventionally used as a fixing method for fixing the center belt and the block pieces, the labor of drilling bolt holes in each belt component is eliminated, and this belt By eliminating the need for any through-holes in the member, due to the existence of these holes, there is no need for any holes in the center belt, which eliminates the need for cracks that frequently occur around these holes. This eliminates the problem of acceleration of belt deterioration, which can greatly contribute to prolonging the belt life of block belts.

In addition, in the method for manufacturing a block belt according to the present invention, when a pair of block pieces is disposed on both sides of the flat belt-shaped center belt, a fitting means is provided for providing a convex piece and a concave groove on the contact surfaces of both structural members. After that, the belt is assembled into three configurations by fitting the fastening member into the vertical groove provided on the side wall surface of the block piece and forming an inwardly bent part in the middle near the tip of the fastening member. By shaping the parts into approximately the regular belt shape, subsequent attachment to the caulking tool becomes easy, and the fastening members, which are responsible for the final tightening work of each belt component, are formed at both ends. The existence of the inwardly bent part in the middle of the block belt serves as an index for locating the corner of the block belt, making it easier to assemble and mold the belt.
Furthermore, the existence of this pre-formed inward bent portion makes it possible to clarify the bending point of the fastening member during the pressing operation with the pushing strip of the pushing side tool during the crimping tool, and then to form a V-shape by this bent portion. Fastening and finishing work can be done quickly and reliably.

In addition, the top surface of the upper block forming the back surface of the belt is pre-formed in a V-shape, and the pushing strip of the pushing side tool of the caulking tool has a chevron shape, and due to the synergistic effect of the elasticity possessed by the block pieces, Both ends of the linear fastening member are bitten into a V-shape at the back surface of the belt, thereby making it possible to further ensure the tightening effect of the belt component.

[Brief explanation of the drawing]

Fig. 1 is a front view of a part of a block belt embodying the present invention, Fig. 2 is an enlarged cross-sectional view taken along the line A-A in Fig. 1, Fig. 3 is a perspective view showing an exploded state of the block body, and Fig. 3 is a perspective view showing an exploded state of the block body. Figure 4 is a front view of the linear fastening member before tightening work, Figure 5 is an exploded perspective view of the receiving and pushing tools that make up the crimping tool, and Figure 6 is the block belt in the crimping tool. FIG. 7 is a central vertical cross-sectional view showing the manufacturing process of the block belt, which corresponds to FIG. 6 immediately after the block belt has been tightened. In the figure, 1...Block belt, 2...Center belt, 4...Rope tension body, 5...Block body, 5a...Upper block piece, 5b...Lower block piece, 7...Convex piece, 8 ... Concave groove, 10 ... Vertical groove, 1
2... V-shaped top surface, 14... Linear fastening member, 1
6... Rising part, 17... Inward bending part, 1
7'... Inward halfway bent part, 18... Bending point, 21... Caulking tool, 22... Receiving tool,
23... Fitting part, 24... Pushing side tool, 25... Pushing strip, 26... Mountain part.

Claims (1)

[Scope of Claims] 1. A pair of upper and lower block pieces made of rubber-like elastic bodies are arranged on both sides and relative positions of a flat belt-shaped center belt in which tensile bodies are embedded, and are arranged at predetermined pitches. In forming the block body, a fitting means of a convex piece and a concave groove is provided on the contact surface between the center belt and each block piece, and at least vertical grooves are formed on both side walls of the pair of block pieces. A block belt in which a block body is fixedly attached by a fastening means in the form of a wire trunk, in which a part of a linear fastening member is fitted. 2. The top surface of the one-side block piece forming the block body is formed in a V-shape, and both ends of the linear fastening member are bent into a V-shape along the V-shaped top surface. Block Belt. 3. When placing block bodies at predetermined pitches using a flat center belt with a tensile member embedded as a core body, the block bodies are assembled from a pair of block pieces placed on both sides of the core body. A part of the approximately U-shaped linear fastening member, which approximately matches the outer shape of the block body including the core body and has an inwardly bent part at both ends, is attached to both sides of the assembled block piece. After fitting into the vertical groove provided in the wall and temporarily tightening the belt block body into a wrap-around shape using the fastening member, the block body is attached to the receiving tool constituting one of the caulking molding tools. A method for producing a block belt, in which the belt is fitted with an inward half-folded part left, and then the half-folded part is pressed and bent toward the block body using the other pushing tool of the caulking tool. 4. The pushing side tool that constitutes a part of the caulking tool has a gentle chevron-shaped pushing strip, presses and bends the inwardly bent part of a pair of cotton-like fastening members, and presses and bends the pair of folds. 4. The method of manufacturing a block belt according to claim 3, wherein the portion is bent and fixed in a V-shape manner into the back surface of the belt along a gentle V-shaped top surface formed on the back surface side of the block body.