JPH0518518Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a block-connected V-belt that is used by being wound around V-shaped pulleys provided on a driving shaft and a driven shaft.

(Prior art) Many power transmission belts combining chains and blocks have been proposed in the past, including JP-A-56-52647, JP-A-63152, and JP-A-57-120748. All of them have a V-shaped block fixed to a chain, and since the V-shaped block is fixed, when it is wrapped between the V-belts, there is a possibility that it will not match the V angle in the V-pulley. However, there was a problem that sufficient transmission ability could not be obtained.

Therefore, in order to solve the above problem, the inventor of the present invention first focused on the structure of the blocks in the chain-type V belt, that is, the friction material that contacts both sides of the V pulley. A chain-type V-belt that is connected with a friction material at both ends of the pin, and is used by wrapping it between the V-pulleys provided on the driving shaft and the driven shaft, and the inner surface of the friction material that contacts both sides of the V-pulley in the same belt. It has been proposed to provide a spherical recess, and to provide spherical protrusions on both ends of the pin facing the spherical recess, so that the spherical protrusions and the spherical recess are fitted in a freely movable manner.

However, these chain type V-belts usually
Because the links are closed, it is not easy to supply lubricating oil to the sliding surfaces from the outside, which is especially difficult under high-speed, high-tension running conditions, and it has been found that the oil film is likely to run out and cause problems such as seizure. .

(Problems to be solved by the invention) The present invention deals with the above-mentioned actual situation, focuses on the above problem, uses a uniquely shaped block, and solves the block by fitting the spherical protrusion and the spherical recess. The purpose of this connection is to improve the lubrication effect on the sliding surfaces, prevent wear, seizure, etc. between the spherical parts, and thereby improve high-speed running characteristics.

(Means for Solving the Problems) That is, the features of the present invention that meet the above objectives are that it is particularly Y-shaped, has a spherical protrusion at the lower part, and a spherical recess at the upper branch. Y with
A mold block is used as an element, and a spherical protrusion and a spherical depression are rotatably connected within a predetermined range between adjacent blocks to form an endless shape. In the connecting portion, a cut groove is provided in the center of the spherical protruding portion of the block, and a hole penetrating from the upper surface to the lower surface is provided in the spherical recessed portion that fits adjacently, so that the spherical protrusion of the mutually adjacent blocks is provided with a cut groove. A pin or the like is passed through and secured to the shaped part and the spherical recessed part in a fitted state, and the side surfaces of each block are formed into inclined surfaces matching the groove angle of the V-pulley.

Here, the above-mentioned Y-shaped block is made of metal materials such as iron, iron alloy, aluminum, aluminum alloy, titanium, and titanium alloy, and these metal materials undergo various processing treatments as necessary to form the block. administered.

In other words, quenching, nitriding, hard chrome plating, ceramic dispersion plating, thermal spray coating, etc. are used for iron-based materials and iron alloys, while ceramic dispersion plating, hard alumite treatment, etc. are used for aluminum-based materials and aluminum alloys. be.

(Function) The power transmission belt constructed as described above connects the above Y-shaped blocks to form an endless belt,
When this is used by wrapping it around the V-pulleys on the driving side and the driven side, an oil pool is formed inside the belt, and hydraulic pressure is generated by the centrifugal force in the pulleys.The oil pressure forcibly lubricates the spherical part with oil, causing the spherical surface to lubricate. It prevents wear, seizure, etc. between parts and contributes to improving transmission efficiency.

(Embodiments) Hereinafter, embodiments of the belt of the present invention will be described with further reference to the accompanying drawings.

Figure 1 is a perspective view of a Y-shaped block that is a component of the belt of the present invention, Figure 2 is a side view of the same, and Figure 3 is a side view of the same.
The figure is a perspective view showing the connected state of the blocks.

In these figures, reference numeral 1 denotes a block constituting a component of the belt of the present invention, which is Y-shaped and has a spherical protrusion 2 at the bottom and a spherical recess 3 at the upper branch. A cut groove 4 is provided in the center of the spherical protrusion 2,
On the other hand, the spherical recessed portion 3 is provided with a hole 5 that penetrates from the upper surface to the lower surface.

However, in the block configuration as described above,
The fitting structure between the spherical recess 3 and the adjacent spherical protrusion 2 is designed to prevent them from coming apart in the tensile direction.

That is, in FIG. 2, the internal contact point of the notch tip of the spherical recess 3 of the block with the spherical protrusion 2 is P ₁ ,
P ₂ , the center point of the recessed part 3 is O ₁ , the center of the spherical protrusion 2 is O ₂ , the extension line connecting O ₁ and O ₂ is the line _{1 1} ,
When the angles formed with lines _{1 and 2} are θ ₁ and θ ₂ , respectively, θ ₁
+θ ₂ must be <180°.

Practically speaking, it is desirable that θ ₁ +θ ₂ <160°.
Note that the ratio between θ ₁ and θ ₂ is θ 1 when θ ₁ is the outer diameter side of the pulley and θ ₂ is _the inner diameter side of the pulley.
<θ ₂ is desirable. However, the ratio needs to be determined by the required minimum pitch diameter in the belt pulley.

FIG. 3 shows a state in which the Y-shaped blocks are connected and formed into an endless shape, and are connected by fitting the spherical protrusion 2 and the spherical recess 3, and In the mated state, a fastening material 6 such as a pin is inserted through the hole 5 on the top surface, through the cut groove 4 of the spherical protrusion 2, and through the hole 5 on the bottom surface to connect each block 1.

In this case, the fastening material is not limited to the pin shown in the figure, but any existing fastening materials such as spring pins, cotter pins, tapered pins, parallel pins, rivets, etc. can be used, and by fastening with these fastening materials, Locks movement in the thrust direction between each block.

Figure 4 shows the state in which the endless belt connected as described above is wound around a pulley and used. When the belt runs, an oil pool is formed inside the pulley. This represents a state in which hydraulic pressure is generated by centrifugal force, and the hydraulic pressure is used to forcibly lubricate the spherical surface with oil.

Figures 5 and 6 show the belt of the present invention described above.
A modified embodiment is shown in FIG. 5, in which the belt of the present invention is cut in cross section with top and bottom surfaces cut 8,
Undercut 9 to reduce the contact area with the pulley V groove, reduce the difference in circumferential speed between the upper and lower surfaces of the contact surface, and at the same time increase the surface pressure appropriately to increase the relative coefficient of friction with the pulley, and also improve the transmission capacity. We are trying to improve efficiency.

In addition, to prevent each block from coming off in the thrust direction, it is fixed and locked using a fastening material such as a pin as described above, but if the clearance in the thrust direction causes deviation in the left and right thrust direction. This may cause interference when the belt is inserted into the pulley.

To prevent this, in FIG. 6, reliefs 10 are provided in the form of notches at the front and rear, left and right V sides of the block 1 in the longitudinal direction.

In the figure, 7 is a side surface of the block, which is formed into an inclined surface with an angle θ matching the groove angle of the V-pulley.

In FIGS. 5 and 6, the same reference numerals as in FIGS. 1 to 4 indicate the same parts, respectively.

Thus, the belt of the present invention is constructed as described above, and unlike chain-type belts using link pins, it has advantages particularly in high-speed running characteristics.

(Effects of the invention) As described above, the present invention uses a block that is Y-shaped and has a spherical protrusion at the bottom and a spherical depression at the top, and by fitting the protrusion and the depression into each other. , which are connected to each other, and compared to conventional chain-type belts using links and pins, the entire belt width acts as a tensile member (if conventional links and pins are used, 1/1/2 of each belt width) 2), it is possible to increase the specific strength per cross-sectional area of the belt, and compared to the link or pin type, part of the spherical sliding surface is open, causing oil to accumulate inside when the belt runs. This has the effect of forcibly lubricating the spherical parts with oil, thereby preventing wear, seizure, etc. between the spherical parts, and has the remarkable effect of greatly improving high-speed running characteristics.

In addition, adjacent blocks are connected by the fitting of their spherical protrusions and spherical recesses, and are fixed by a fastening material such as a penetrating pin.
It has the effect of preventing the block from coming off in the thrust direction, and together with its simple structure and small number of parts, it is an extremely useful power transmission belt suitable for high horsepower and high speeds.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a block as a main constituent member of the belt of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a perspective view showing a state in which the blocks are connected, and Fig. 4 is An explanatory diagram of the oil lubrication situation when the belt of the present invention is in use. Figures 5 and 6 are views showing various modified embodiments of the above-mentioned block in the present invention. Figure 5 is a diagram of the state in which the belt is wrapped around the pulley, and Figure 6 is a perspective view. It is a diagram. 1... Block, 2... Spherical protrusion, 3... Spherical depression, 4... Cut groove, 5... Hole, 6...
Pin et al.

Claims (1)

[Claims for Utility Model Registration] 1. Has a Y-shape and has a spherical protrusion at the bottom,
Y-shaped blocks each having a spherical concave portion at the top thereof are connected rotatably within a required angle range by fitting the spherical convex portions and the spherical concave portions of adjacent blocks to form an endless shape, and the blocks have a spherical concave portion. A cut groove is provided in the center of the protrusion, while
A hole penetrating from the upper surface to the lower surface is provided in the adjacent fitting spherical recessed portions, and a pin or the like is passed through and fixed to the spherical protruding portion and the spherical recessed portion of the mutually adjacent blocks in a fitted state, and the side surfaces of each block are A power transmission belt characterized by having an inclined surface that matches the groove angle of a V-pulley. 2. The power transmission belt according to claim 1, wherein the block is made of a metal material such as iron, iron alloy, aluminum, aluminum alloy, titanium, or titanium alloy. 3. The power transmission device according to claim 2, wherein at least the V-side surface of the block made of iron or iron alloy is treated by hardening, nitriding, hard chrome plating, ceramic dispersion plating, thermal spray coating, etc. belt. 4. The power transmission belt according to claim 2, wherein at least the V-side surface of the block made of aluminum or aluminum alloy is treated by ceramic dispersion plating, hard alumite treatment, etc.