JPS6122888Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a chain wheel for a conveyor chain, and particularly relates to the structure of a chain wheel around which a block chain is wound.

As shown in FIGS. 1 and 2, the block chain 1 has inner link blocks 3 with hole pitches P1 of pins 2 arranged one after the other, and outer link blocks with hole pitches P2 of pins 2 from both sides of the inner link blocks 3. 4 are symmetrically opposed and in contact with each other, and are connected via pins 2 so as to be flexible. As shown in FIG. 3, the conventional chain wheel 5 on which the block chain 1 is wound has its teeth 6 fitted between the front and rear inner link blocks 3 and the left and right outer link blocks 4, and the tooth bottom 7. is in contact with the inner link block 3, and the pins 2 are arranged on the pitch circle 8.

However, when the block chain 1 is wrapped around the rotating chain wheel 5, if the outer periphery of the inner link block 3 comes into contact with the tooth portion 6 or the tooth bottom portion 7 directly or indirectly through a foreign object, a frictional resistance is generated in this contact portion. acts. If this frictional resistance is large, the inner link block 3 will prevent the rear part of the inner link block 3 from rotating in the direction along the tooth bottom 7 around the front pin 2 (due to poor bending of the inner link block 3). ), the block chain 1 wraps around the chain wheel 5 while floating from the tooth bottoms 7 of the link block 3 and the chain wheel 5, and the block chain 1
There was a drawback that the chain wheel 5 would not mesh well with the chain wheel 5.

In view of the above-mentioned drawbacks, the object of this invention is to provide a chain wheel that can maintain meshing even if the inner link block is poorly bent.

An embodiment of this invention will be explained with reference to FIG.
The same reference numerals are used for members common to those in the conventional art. Fourth
In the figure, a polygon is drawn around the chain wheel 9 with the length of one side equal to pitch P1 + pitch P2, and on each side of this polygon is drawn the inner link block 3 of the block chain 1.
and outer link blocks 4 are arranged in order, and a tooth bottom 10 inscribed in the inner link blocks 3 arranged on each side is formed. Similarly, tooth profiles 11 are formed to fit freely between the outer link blocks 4 on both sides of the chain and between the front and rear inner link blocks 3. The direction of rotation of the chain wheel 9 is in the direction of arrow A so that the tooth profile 11 on each side precedes the tooth bottom 10, and a backlash 12 with the inner link block 3 is provided at the rear of the tooth profile 11.

The operation of the above configuration will be explained next.

When the block chain 1 is wound around the chain wheel 9 rotating in the A direction, the outer link block 4 following the inner link block 3 meshed with the tooth bottom 10 bends freely because there is nothing in contact with its outer periphery. , are fitted onto both sides of the tooth profile 11. This external link block 4
The inner link block 3 connected after the chain 1 wraps around the chain wheel 9 while remaining in a straight line with the outer link block 4 due to the tension applied to the block chain 1.
0, block chain 1 and chain wheel 9
and mesh normally. Block chain 1 and chain wheel 9
When a foreign object is caught between the tooth bottom 10 and the inner link block 3 with the foreign object caught between the tooth bottom 10 and the tooth bottom 10, the inner link block 3 lifts up from the tooth bottom 10, and the pin 2 at the rear of the lifted inner link block 3 moves from its normal position Displace. The outer link block 4 connected after the lifted inner link block 3 follows the displaced pin 2 and bends while being displaced. The inner link block 3 connected after the outer link block 4, which is bent while being displaced, wraps around the chain wheel 9 while being directly connected to the outer link block 4, contacts the tooth bottom 10 in parallel, and is displaced. To reduce the amount of displacement of the outer link block 4. The backlash is 12 and the tooth bottom is 10.
The front surface and tooth profile 11 of the inner link block 3 that fits into the
This prevents interference with the rear part of the block chain 1 and the chain wheel 9, and even if a foreign object gets caught between the block chain 1 and the chain wheel 9, the two return to normal engagement.

As explained above, this invention is a chain wheel in which a pair of inner link blocks 3 and outer link blocks 4 form one side of a regular polygon, with tooth profiles 11 and tooth bottoms 10. Since it has a structure that rotates to the side, even if the inner link block 3 following the outer link block 4 does not bend, the inner link block 3
Since the outer link block 4 following the chain is freely bent and the inner link block 3 is engaged with the tooth bottom 10, the block chain 1 and the chain wheel 9 can be wound smoothly.

[Brief explanation of the drawing]

Figure 1 is a plan view of the block chain, Figure 2 is a side view of the block chain, Figure 3 is a front view showing the block chain wrapped around a conventional chain wheel, and Figure 4 is a front view of the block chain wrapped around a conventional chain wheel.
The figure is a partially cutaway front view showing a state in which a block chain is wrapped around a chain wheel according to an embodiment of the invention. 3: Inner link block, 4: Outer link block, 9: Chain wheel, 11: Tooth profile, 12: Backlash.

Claims (1)

[Scope of utility model registration request] In a chain wheel on which a block chain in which inner link blocks and outer link blocks are connected alternately is wound, the inner and outer link blocks are formed when the outer periphery of the chain wheel is connected as a set of inner link blocks and outer link blocks in a straight line. A polygon whose side length is the sum of the pitches of A chain wheel for block chain.