Tightness-adjustable crankshaft pulley assembly

Abstract

The utility model belongs to the field of belt pulleys, and particularly relates to a tightness-adjustable crankshaft belt pulley assembly which comprises a positioning plate. A crankshaft rod is arranged on one side of the surface of the positioning plate, a sliding groove is formed in the other side of the surface of the positioning plate, a fixing shaft is horizontally and slidably connected into the sliding groove, a directional hole coaxial with the sliding groove is formed in the middle of one end of the positioning plate, a threaded lead screw is movably connected to the side face of the fixing shaft, and one end of the threaded lead screw penetrates through the interior of the directional hole. A connecting ring is arranged on the surface of the directional hole, a nut is rotationally connected to the surface of the connecting ring, and a threaded hole matched with the threaded lead screw is formed in the nut; through the linkage adjusting structure design of the sliding groove and the threaded lead screw, the tightness of the belt is conveniently adjusted, the rotating nut drives the threaded lead screw to drive the fixing shaft to horizontally move along the sliding groove, the limiting block and the limiting groove restrain the sliding track, the problem that a traditional belt pulley falls off due to looseness is solved, and the adjusting efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a belt pulley field, concretely is a kind of adjustable tightness crankshaft belt pulley assembly. BACKGROUND

[0002] Belt pulley drive is a kind of mechanical transmission mode that motion and power are transmitted by the friction between belt and belt pulley. It is that one or more belts are tightly sleeved on two belt pulleys, respectively installed on driving shaft and driven shaft, and power is transmitted by the friction between belt and belt pulley.

[0003] In prior art, such as the patent with publication number CN203542190U, a belt pulley drive structure is disclosed, which comprises motor, connecting plate, first belt pulley, belt, second belt pulley, main shaft, spacer sleeve, locking nut and workbench base. The motor is connected with the connecting plate and fixed on the workbench base. The first belt pulley is installed on the motor shaft head. The main shaft is arranged on the workbench base. The second belt pulley is installed below the main shaft. The spacer sleeve is arranged between the second belt pulley and the locking nut, and the locking nut is tightened to prevent the second belt pulley from falling. The first belt pulley and the second belt pulley are connected by the belt.

[0004] The above patent eliminates the gearbox between the motor and the main shaft, and has simple, ingenious and reasonable structure. The transmission is stable, the number of stages is reduced, the noise is low, the cost is reduced, and the installation period is shortened. However, the belt will be loose after a period of use, which will seriously cause the belt to fall off and affect use. In addition, the belt needs to be regularly maintained and replaced. When replacing, the belt cannot be smoothly sleeved on the belt pulley, which causes inconvenience in maintenance and replacement. Therefore, the above problems are solved by providing a crankshaft belt pulley assembly with adjustable tightness. CONTENT OF UTILITY MODEL

[0005] In order to make up for the shortcomings of prior art, the belt will be loose after a period of use, which will seriously cause the belt to fall off and affect use. In addition, the belt needs to be regularly maintained and replaced. When replacing, the belt cannot be smoothly sleeved on the belt pulley, which causes inconvenience in maintenance and replacement. Therefore, the utility model provides a crankshaft belt pulley assembly with adjustable tightness.

[0006] The utility model discloses a technical scheme that solves its technical problem is adopted: a kind of adjustable tightness's crank pulley assembly of the utility model, including locating plate;The locating plate surface one side is provided with crank axle, the locating plate surface other side is provided with sliding slot, the fixed shaft is connected inside horizontal sliding of sliding slot, the locating plate one end middle part is provided with the directional hole coaxial with sliding slot, the fixed shaft side surface movably connects threaded lead screw, the threaded lead screw one end penetrates directional hole interior, the directional hole surface is provided with connecting ring, the connecting ring surface is rotatably connected nut, the nut interior is provided with the screw hole that is adapted with threaded lead screw, the threaded lead screw one end penetrates directional hole and is connected with screw thread;The top surface and bottom surface of sliding slot are provided with limit slot, the fixed connection limit block of fixed shaft top and bottom, the limit block is slidably connected in limit slot interior, the crank axle one end is provided with large flywheel, the fixed axle one end is provided with small flywheel, the surface of large flywheel and small flywheel is sleeved with belt.

[0007] Preferably, the large flywheel and the small flywheel are provided with limit discs on both sides, the outer diameter of the limit disc is larger than the outer diameter of the large flywheel and the small flywheel, and the inner wall of the limit disc is welded with reinforcing ribs.

[0008] Preferably, the inner wall of the sliding slot is coated with a wear-resistant lubricating coating, and the contact surface of the limit block and the limit slot is embedded with an elastic gasket.

[0009] Preferably, the outer surface of the nut is processed with anti-skid lines, and a self-lubricating bearing is arranged at the connection between the connecting ring and the directional hole.

[0010] Preferably, the thread pitch of the threaded lead screw gradually decreases from the middle to both ends, and a mechanical limit block is arranged at the end of the limit slot.

[0011] Preferably, the cross section of the limit block is in a trapezoidal structure, and a trapezoidal guide groove adapted to the limit block is formed in the inner wall of the limit slot.

[0012] The utility model has the advantages that:

[0013] 1. The utility model realizes convenient adjustment of the tightness of the belt through the linkage adjustment structure design of the sliding slot and the threaded lead screw, the threaded lead screw drives the fixed shaft to move horizontally along the sliding slot under the drive of the rotating nut, the limit block and the limit slot constrain the sliding track, the problem of falling off of the traditional belt pulley due to relaxation is solved, and the adjustment efficiency is improved.

[0014] 2. The utility model realizes convenient adjustment of the tightness of the belt through the linkage adjustment structure design of the sliding slot and the threaded lead screw, when the belt needs to be replaced, the threaded lead screw drives the fixed shaft to retreat horizontally along the sliding slot by only turning over the nut, and then the belt can be easily taken out from the pulley, the adjustment operation does not need to disassemble the components, and the maintenance efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0017] Figure 2 It is a schematic diagram of the fixed plate structure of the present application.

[0018] Figure 3 It is a schematic diagram of the fixed shaft and threaded screw structure of the present application.

[0019] Figure 4 It is a schematic diagram of the large flywheel and small flywheel structure of the present application.

[0020] In the figure: 1, positioning plate; 2, sliding groove; 3, fixed shaft; 4, directional hole; 5, threaded screw; 6, connecting ring; 7, nut; 8, threaded hole; 9, limiting groove; 10, limiting block; 11, large flywheel; 12, small flywheel; 13, belt; 14, limiting disc; 15, crank rod. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] Please refer to Figures 1-4As shown, a kind of adjustable tightness crankshaft pulley assembly, including positioning plate 1;Positioning plate 1 surface one side sets up crankshaft 15, the other side of positioning plate 1 surface is equipped with sliding slot 2, the inside horizontal sliding connection fixed shaft 3 of sliding slot 2, the middle part of one end of positioning plate 1 is equipped with the directional hole 4 of the same axis line with sliding slot 2, the side surface of fixed shaft 3 is movably connected with threaded rod 5, one end of threaded rod 5 penetrates the inside of directional hole 4, the surface of directional hole 4 is equipped with connecting ring 6, the surface of connecting ring 6 is rotatably connected with nut 7, the inside of nut 7 is equipped with the screw hole 8 of the adaptation of threaded rod 5, and one end of threaded rod 5 is screwed with the screw hole 8 of directional hole 4;The top surface and bottom surface of sliding slot 2 are equipped with limiting groove 9, and the top and bottom of fixed shaft 3 are fixedly connected with limiting block 10, limiting block 10 is slidably connected in the inside of limiting groove 9, one end of crankshaft 15 is provided with large flywheel 11, one end of fixed shaft 3 is provided with small flywheel 12, and the surface of large flywheel 11 and small flywheel 12 is sleeved with belt 13;

[0023] When working, rotating nut 7 drives threaded rod 5 to rotate through connecting ring 6, fixed shaft 3 is moved horizontally along sliding slot 2 by threaded rod 5, limiting block 10 is slidably constrained in limiting groove 9, the distance between large flywheel 11 and small flywheel 12 is changed to realize the tightness adjustment of belt 13, and fixed shaft 3 is retreated to disassemble belt 13 by reversing the rotation of nut 7, the stepless adjustment and quick disassembly of the tightness of belt 13 are realized through the transmission of threaded rod 5 and the limiting structure of sliding slot 2, and the falling problem caused by the relaxation of the traditional pulley is solved.

[0024] Further, limiting disc 14 is arranged on the two sides of large flywheel 11 and small flywheel 12, the outer diameter of limiting disc 14 is greater than the outer diameter of large flywheel 11 and small flywheel 12, and the inner wall of limiting disc 14 is welded with reinforcing ribs;

[0025] When working, limiting disc 14 is welded on the two sides of large flywheel 11 and small flywheel 12, the outer expanded edge of limiting disc 14 covers the two sides of belt 13, the reinforcing ribs are distributed along the inner wall of limiting disc 14 in a ring shape, the transverse displacement of belt 13 is limited, limiting disc 14 prevents belt 13 from deviating and falling off, the reinforcing ribs improve the anti-deformation capacity of the structure, and the maintenance frequency is reduced.

[0026] Further, the inner wall of sliding slot 2 is coated with a wear-resistant lubricating coating, and the contact surface of limiting block 10 and limiting groove 9 is embedded with an elastic gasket;

[0027] When working, the inner wall of sliding slot 2 is sprayed with a polytetrafluoroethylene wear-resistant coating, the contact surface of limiting block 10 and limiting groove 9 is pasted with a rubber elastic gasket, the sliding friction and vibration noise are reduced, the wear-resistant coating prolongs the service life of sliding slot 2, the elastic gasket absorbs impact vibration, and the adjustment process is stable.

[0028] Further, the outer surface of nut 7 is processed with anti-skid lines, and self-lubricating bearings are arranged at the connection between connecting ring 6 and directional hole 4;

[0029] When working, the outer surface of the nut 7 is rolled with cross diamond non-slip lines, the self-lubricating bearing is installed between the connecting ring 6 and the directional hole 4, the rotating resistance of the threaded rod 5 is reduced, the non-slip lines improve the manual operation holding force, and the self-lubricating bearing makes the adjustment more labor-saving and smooth.

[0030] Further, the pitch of the threaded rod 5 gradually decreases from the middle to the two ends, and the end of the limiting groove 9 is provided with a mechanical limiting block;

[0031] When working, the middle part of the threaded rod 5 has a large pitch for rapid adjustment, and the pitch gradually decreases towards the two ends for fine adjustment, the end of the limiting groove 9 is welded with a steel block to limit the maximum displacement of the fixed shaft 3, the gradually changing pitch realizes the combination of fast adjustment and fine adjustment, and the mechanical block prevents the adjustment from overshooting and damaging the belt 13.

[0032] Further, the cross section of the limiting block 10 is in a trapezoidal structure, and the inner wall of the limiting groove 9 is provided with a trapezoidal guide groove matched with the limiting block 10;

[0033] When working, the cross section of the limiting block 10 is trapezoidal, the inner wall of the limiting groove 9 is processed with a matching trapezoidal guide groove, the radial shaking of the fixed shaft 3 during sliding is eliminated, the trapezoidal structure bidirectionally locks the sliding direction, the moving track accuracy of the fixed shaft 3 is improved, and the jamming is avoided.

[0034] Working principle: rotating the nut 7 to drive the threaded rod 5 to rotate through the connecting ring 6, drive the fixed shaft 3 to slide horizontally along the sliding groove 2 to adjust the distance between the large flywheel 11 and the small flywheel 12, the limiting block 10 is constrained in the limiting groove 9 to prevent deviation, reverse rotation of the nut 7 makes the fixed shaft 3 retreat to relax the belt 13 for easy replacement, the limiting disc 14 limits the side sliding of the belt 13, the wear-resistant coating and the elastic gasket of the sliding groove 2 reduce the friction noise, and the trapezoidal limiting block 10 and the guide groove ensure the adjustment stability.

[0035] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model is described in detail by referring to the foregoing embodiments, for those skilled in the art, the technical scheme recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently. Any modification, equivalent replacement, similar improvement, etc. within the theory and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An adjustable tension crank pulley assembly, characterized by: Including positioning plate (1), the surface one side of positioning plate (1) is provided with crankshaft rod (15), the surface other side of positioning plate (1) is provided with sliding slot (2), the inside of sliding slot (2) is slidably connected with fixed shaft (3), the middle of one end of positioning plate (1) is provided with directional hole (4) with the coaxial line of sliding slot (2), the side of fixed shaft (3) is movably connected with threaded lead screw (5), one end of threaded lead screw (5) penetrates the inside of directional hole (4), the surface of directional hole (4) is provided with connecting ring (6), the surface of connecting ring (6) is rotatably connected with nut (7), the inside of nut (7) is provided with screw hole (8) matched with threaded lead screw (5), one end of threaded lead screw (5) penetrates directional hole (4) and is threadedly connected with screw hole (8); The top surface and bottom surface of the sliding slot (2) are provided with limiting grooves (9), the top and bottom of the fixed shaft (3) are fixedly connected with limiting blocks (10), the limiting blocks (10) are slidably connected in the limiting grooves (9), one end of the crankshaft rod (15) is provided with a large flywheel (11), one end of the fixed shaft (3) is provided with a small flywheel (12), the large flywheel (11) and the small flywheel (12) are sleeved with a belt (13).

2. An adjustable tensioner for a crank pulley assembly as set forth in claim 1, wherein: The large flywheel (11) and the small flywheel (12) are provided with limiting discs (14) on both sides, the outer diameter of the limiting disc (14) is larger than the outer diameter of the large flywheel (11) and the small flywheel (12) and the inner wall is welded with reinforcing ribs.

3. An adjustable tensioner for a crank pulley assembly as set forth in claim 1 wherein: The inner wall of the sliding slot (2) is coated with a wear-resistant lubricating coating, and the contact surface of the limiting block (10) and the limiting groove (9) is embedded with an elastic gasket.

4. An adjustable tensioner for a crank pulley assembly as set forth in claim 1 wherein: The outer surface of the nut (7) is processed with anti-skid lines, and the connecting ring (6) and the directional hole (4) are provided with self-lubricating bearings.

5. An adjustable tensioner for a crank pulley assembly as set forth in claim 1 wherein: The thread lead of the threaded lead screw (5) gradually decreases from the middle to both ends, and the end of the limiting groove (9) is provided with a mechanical limiting block.

6. An adjustable tensioner for a crank pulley assembly as set forth in claim 1 wherein: The cross section of the limiting block (10) is trapezoidal structure, and the inner wall of the limiting groove (9) is provided with a trapezoidal guide groove matched with the limiting block (10).

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