Fly cutter grinding wheel for bicycle belt forming groove

Abstract

The fly-cutter grinding wheel for the bicycle belt forming groove comprises a carrier, annular side discs axially located on the two sides of the carrier, blades and an annular cutter disc, a locating face extending in the radial direction is arranged on the radial outer side of the carrier, the cutter disc is arranged on the carrier in a sleeved mode and fixedly installed on the locating face of the carrier, and the blades are installed in installation grooves in the cutter disc. The blades are fixed on the cutter head through fasteners, cutting edges of the blades radially protrude out of the cutter head, the cutting edges comprise front cutter edges and cutting edge rear parts, the front cutter edges comprise left cutting edges and right cutting edges, the left cutting edges and the right cutting edges are connected through upper cutting edge tangent lines, the upper cutting edges are arc-shaped, and the radial top ends of the left cutting edges and the right cutting edges contract inwards; when the fly-cutter grinding wheel is used for cutting a belt forming groove, the production efficiency is improved, the forming quality of the groove is high, the hair phenomenon is reduced, in addition, the blades can be independently detached and replaced, the overall replacement is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the processing and forming of a bicycle transmission belt, in particular to a flying knife grinding wheel for a bicycle belt forming groove. Background Art

[0002] Traditional bicycles generally use chain drive, where the crank drives the front sprocket, and then the chain transfers the power from the front sprocket to the rear sprocket, driving the wheels to rotate. Chain drive has led to the rapid development of bicycles, but the chain needs to be lubricated regularly, otherwise it may rust, or the chain may become loose and fall off, making it difficult to install. There may also be noise problems. Alternative solutions based on chain drive, similar to automotive timing drives, can be replaced with synchronous belts. Many years ago, Gates introduced the use of belts instead of chains to drive bicycles. To ensure the alignment of the belts between the front and rear wheels, Gates designed a series of belts 200 with grooves 201 in the middle, which cooperate with the limiting edges in the middle of the bicycle pulley 100 as shown in the figure. Figure 1 , to prevent the belt from detaching from the pulley, but the current method of grinding is to grind the belt into grooves. The processing of the belt groove has problems such as hairiness. At the same time, too much accumulation of grinding chips will cause heat concentration, causing safety hazards. In addition, the tool is an integral assembly, and the blade is welded on the carrier. When the blade is damaged, it needs to be replaced as a whole, and the maintenance cost is high. This creation aims to provide a safe, high-quality, easy-to-maintain and low-cost grinding wheel. Utility Model Content

[0003] The utility model provides a flying knife grinding wheel for forming grooves of bicycle belts to solve the above technical problems, comprising a carrier installed on a central axis and annular side discs axially located at two sides of the carrier, a blade and an annular cutter disc, the carrier being a rotating body with a step surface, a radial outer side of the carrier being provided with a positioning surface extending in a radial direction, the cutter disc being sleeved on the carrier and fixedly mounted on the positioning surface of the carrier, N blade mounting grooves being evenly distributed along a circumferential direction on the radial outer side of the cutter disc, the blade being mounted in the mounting groove and being fixed on the cutter disc by a fastener, the blade comprising a blade, the blade radially protruding from the cutter disc, the blade comprising a front blade and a rear blade portion along the rotation direction of the central axis, the front blade comprising a left blade and a right blade along the axial direction of the central axis, the left blade and the right blade being radially connected by an upper blade tangent, the vertical section of the upper blade being in an arc shape, the radial top ends of the left blade and the right blade being contracted inwardly, having an included angle of 2 to 10 degrees, and the radial outermost end of the blade gradually reducing its radial dimension from the front blade to the rear blade portion along the circumference of the carrier.

[0004] The front edge of the knife extends from the upper blade to the back of the knife in a backward concave arc.

[0005] The number of blades is preferably N, where 30>N>12.

[0006] Preferably, the number of blades is an even number of 20 to 24.

[0007] The width of the mounting groove just accommodates the width of the blade, and the blade is mounted in the mounting groove.

[0008] The blade is provided with a blade mounting hole, and the blade is detachably fixed in the mounting groove of the cutter disc by a step bolt.

[0009] The radial outermost end of the side disc is higher than the cutting edge of the blade, and radially extending avoidance portions having the same number as the blades are uniformly distributed circumferentially at the radial end of the side disc, and the avoidance portions and the blades are cross-distributed along the circumferential direction.

[0010] The avoidance part has a forward inclination angle of 0 to 20 degrees, which is convenient for the discharge of chips.

[0011] The blade is tungsten steel.

[0012] The fly cutter grinding wheel of the invention improves production efficiency due to the use of blade cutting and belt grinding, and the groove forming quality is higher, and the hairiness phenomenon is reduced. In addition, the blade can be disassembled and replaced separately, reducing the overall replacement and reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 , Schematic diagram of the coordination between sprocket and belt;

[0014] Figure 2 , schematic diagram of flying knife grinding wheel structure;

[0015] Figure 3 , front view of the blade;

[0016] Figure 4 , left view of the blade;

[0017] Figure 5 , Installation diagram of some parts of the grinding wheel;

[0018] Figure 6 , a three-dimensional schematic diagram of the blade;

[0019] Figure 7 , side plate schematic diagram.

[0020] In the figure: 10, cutter disc; 11, mounting groove; 12, blade fixing hole; 13, cutter disc mounting hole; 14, center hole; 20, carrier; 40, blade; 41, blade edge; 42, blade back; 43, blade mounting hole; 411, front blade; 412, rear of blade; 413, chip groove; 414, left blade; 415, right blade; 416, upper blade; 50, side disc; 51, avoidance part; 100, sprocket; 200, belt; 201, belt groove. DETAILED DESCRIPTION

[0021] The following is based on the attached Figures 1 to 7 The utility model is described in detail.

[0022] The bicycle belt forming groove flying cutter grinding wheel is used to cut the bicycle belt forming groove 201, so as to achieve the purpose of fast forming groove processing, high precision and no hair.

[0023] Specifically, the flying knife grinding wheel includes a central shaft (not shown) connected to the driving power, which drives the flying knife grinding wheel to rotate, and the belt to be processed is driven to rotate by the belt driving device, and the two are in contact and rotate relative to each other to process the intermediate molding groove 201. The flying knife grinding wheel is installed on the central shaft as a whole through the carrier 20. The carrier 20 is a rotating body structure around the central shaft. The rotating body is preferably a rotating body composed of two or more diameters. The connection between the two diameters is a radially extending step surface for assembling different components. Preferably, a step surface is provided in the approximately middle part of the axial direction of the carrier to form a positioning surface for installing the cutter disc 10, so that the installed blade 40 is positioned in the middle position of the flying knife grinding wheel. The cutter disc 10 is an annular disc, which is sleeved on the carrier 20 through the center hole 14, and one of the side surfaces abuts against the positioning surface of the carrier. The cutter disc is circumferentially distributed with a plurality of cutter disc mounting holes 13, which are connected to the carrier through positioning pins or bolts. A recessed step is provided at the top of the outer end of one side of the cutter disc 10 close to the positioning surface to form a mounting groove 11. The mounting grooves 11 are evenly distributed along the circumferential direction, and the number is N, N is greater than 12 and less than 30, preferably an even number of 20 to 24. It is used to install blades, and 20 to 24 blades are most preferred. The grooves formed by the cutting of the blades in this range are relatively smooth. The width of the mounting groove just accommodates the width of the blade, preventing the blade from rotating during work and affecting the cutting accuracy. Since the blade is relatively small, approximately 2 cm wide and 4 cm long, the mounting groove is used to limit the rotation of the blade, and only one blade mounting hole 43 can be provided on the blade, and the blade can be installed using a fastener. On the one hand, the blade mounting points are reduced, and the blade strength is improved; on the other hand, the blade can be quickly disassembled. The fastener can be a step bolt with a positioning platform, the step is used to locate the blade position, and the bolt end is fastened to the blade fixing hole 12 of the cutter disc. With the design of this structure, when the blade is worn to a certain extent, the blade can be replaced in time to prevent the grinding wheel from being abandoned as a whole, making the replacement and maintenance of the blade more convenient, and reducing the maintenance cost of the equipment. The blade 40 includes an upper blade 41 and a lower blade back 42. The blade and the blade back are an integrated structure, which is conducive to improving the overall rigidity of the blade and preventing the blade 41 from separating from the blade back 42 during operation, thereby improving the safety performance of the processing process. The blade back 42 is installed in the installation groove 11, and the blade 41 protrudes from the cutter disc 10 as a whole. Generally, the root of the blade protrudes slightly from the cutter disc by 2 to 3 mm for easy cutting. The height of the blade is determined according to the depth of the groove to be processed.

[0024] The blade includes the front blade 411 and the rear blade 412 along the central axis. During the processing, the front blade 411 first contacts the belt. The front blade includes a left blade 414 and a right blade 415 along the central axis. The tops of the left blade 414 and the right blade 415 are connected by a tangent line of an upper blade 416. The vertical section of the upper blade 416 is an arc, preferably a part of a circle. In order to prevent the vibration of the flying knife grinding wheel from causing the side surfaces of the blades on both sides to contact and rub against the belt, the radial tops of the left blade and the right blade are contracted inward, with an angle of 2 to 10 degrees, which effectively reduces the fuzziness of the groove. The radial outermost end of the blade gradually decreases from the front blade to the rear blade along the circumference of the carrier. For example, the radius of the axis is reduced by 1 to 5 mm to avoid the fuzziness caused by the top of the rear blade rubbing against the cutting groove.

[0025] The front blade 411 extends from the top of the upper blade to the back of the blade in an arc shape that is concave backward, so that the top of the blade forms an arc tip, which is conducive to cutting the belt and forming an arc cutting to avoid stress concentration in the forming groove and easy cracking. The arc tip transitions from top to bottom, with a smaller curvature at the top and a larger curvature at the bottom, forming a chip groove 413, which is easy to cut and easy to remove chips.

[0026] The carrier 20 is provided with carrier installation steps on both sides of the axial direction for installing the side disc 50 of the disc. The side disc 50 is higher than the blade 40, which protects the blade on the one hand and protects the safety of personnel on the other hand. In order to improve the heat dissipation performance and facilitate chip removal, the side disc 50 can be provided with a plurality of avoidance portions 51 in the circumferential direction. The avoidance portions 51 are staggered with the positions of the blade 40. The avoidance portions 51 are gaps extending approximately axially, and the bottom of the gap is slightly lower than the carrier 20. The gap is tilted backward from the top to the bottom in the radial direction, forming a forward tilt angle of 0 to 20 degrees, which is conducive to the timely discharge of chips during the rotation process.

[0027] The entire blade material can be made of tungsten steel to increase the durability of the blade.

Claims

1. A fly-cutter grinding wheel for forming a bicycle belt groove, comprising a carrier mounted on a central axis and an annular side disc axially located on both sides of the carrier, characterized in that: The blade is mounted in the mounting groove and fixed to the blade disc by a fastener. The blade comprises a blade, and the blade radially protrudes from the blade disc. The blade comprises a front blade and a rear blade along the rotation direction of the central axis. The front blade comprises a left blade and a right blade along the axial direction of the central axis. The left blade and the right blade are radially connected by an upper blade tangent. The vertical section of the upper blade is an arc shape. The radial top ends of the left blade and the right blade are contracted inwardly and have an angle of 2 to 10 degrees. The radial outermost end of the blade gradually decreases in radial dimension from the front blade to the rear blade along the circumference of the carrier.

2. The fly cutter grinding wheel for forming a groove of a bicycle belt as claimed in claim 1, characterized in that: The front blade of the knife extends from the upper blade to the back of the knife in an arc shape which is concave backwards.

3. The flying knife grinding wheel for forming grooves of bicycle belts as claimed in claim 2, characterized in that: The number of the blades is N, and 30>N>12.

4. The flying cutter grinding wheel for forming a groove of a bicycle belt as claimed in claim 3, characterized in that: The number of the blades is an even number of 20 to 24.

5. The fly cutter grinding wheel for forming a groove of a bicycle belt as claimed in claim 4, characterized in that: The width of the mounting groove just accommodates the width of the blade, and the blade is installed in the mounting groove.

6. The fly cutter grinding wheel for forming a groove of a bicycle belt as claimed in claim 5, characterized in that: The blade is provided with a blade mounting hole, and the blade is detachably fixed in the mounting groove of the cutter disc by a step bolt.

7. The fly cutter grinding wheel for forming a groove of a bicycle belt as claimed in claim 6, characterized in that: The radial outermost end of the side disc is higher than the cutting edge of the blade, and the radial end of the side disc is evenly distributed circumferentially with radially extending avoidance portions having the same number as the blades, and the avoidance portions are cross-distributed with the blades along the circumferential direction.

8. The fly cutter grinding wheel for forming a groove of a bicycle belt as claimed in claim 7, characterized in that: The avoidance portion has a forward inclination angle of 0 to 20 degrees.

9. The fly cutter grinding wheel for forming a groove of a bicycle belt according to any one of claims 1 to 8, characterized in that: The blade is a tungsten steel blade.

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