Self-adaptive tensioning chain wheel

Abstract

The self-adaptive tensioning chain wheel comprises a hub, connecting pieces, wheel teeth, side plates and screws, the wheel teeth are arranged in wheel tooth grooves of the hub, each wheel tooth is connected with the hub through the corresponding independent connecting piece, the connecting pieces are of telescopic structures, the distance of the wheel teeth extending out of the hub is adjustable, the side plates are arranged on the two sides of the hub, and the screws are arranged on the side plates. The side plates are connected with the hub through screws, gaps are formed between the peripheral edges of the side plates and the end faces of the gear teeth, oil grooves are formed in inner cavities of the side plates, lubricating oil channels are formed in the end faces of the two sides of the gear teeth, each lubricating oil channel corresponds to an oil outlet connected with the corresponding oil groove, and the oil outlets are attached to the end faces of the roots of the gear teeth. The chain wheel has the advantages that when the chain is abraded, the wheel teeth of the chain wheel can stretch out and draw back in the radial direction to automatically tension the chain and prevent the chain from skipping or falling off; lubricating oil can flow out through the lubricating oil channel only when the gear teeth are meshed with the chain, the lubricating efficiency is high, meanwhile, the connecting piece is elastic, friction and vibration can be further reduced, and loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to an adaptive tensioning sprocket. Background Art

[0002] Chain drive is a transmission method that transmits the motion and power of a driving sprocket with a special tooth shape to a driven sprocket with a special tooth shape through a chain. Chain drive has no elastic sliding and slipping, accurate average transmission ratio, reliable operation, high efficiency; large transmission power, strong overload capacity, small transmission size under the same working conditions; can work in harsh environments such as high temperature, humidity, dust, pollution, etc.

[0003] Chinese patent publication number: CN210531530U, discloses an adaptive tensioning sprocket, which is used to solve the problem that the sprocket mechanism in the prior art does not have an adaptive function, cannot effectively ensure that there is a certain radial force on the sprocket rolling teeth at all times, and cannot independently face the technical problem of impact and vibration until the chain pitch increases and causes the phenomenon of tooth skipping. Specifically, it includes two sets of sprocket side plates, the intermediate wheel is installed between the two sets of sprocket side plates, and a plurality of rotatable sprocket rolling teeth are evenly arranged in the radial direction of the intermediate wheel and are elastically connected to the intermediate wheel. Any sprocket rolling tooth can generate an elastic force. The sprocket rolling tooth moves along a preset direction under the action of the elastic force and contacts with its corresponding two meshing teeth to tension the toothed chain. The adaptive tensioning sprocket has an adaptive function, which can effectively reduce the impact and vibration when the chain and sprocket are meshed, and reduce the probability of tooth skipping. However, the above-mentioned adaptive tensioning sprocket has the following obvious defects in use:

[0004] 1. When the sprocket teeth and the toothed chain are meshing, the axial force of the toothed chain will cause the sprocket teeth to rotate, which may easily lead to tooth skipping.

[0005] 2. There is a lack of lubrication structure at the meshing point between the sprocket teeth and the toothed chain, which reduces the service life. Utility Model Content

[0006] The technical problem to be solved by the utility model is that the sprocket teeth are prone to tooth jumping due to rolling and lack of friction at the meshing point, which greatly reduces the service life; in view of the above problem, an adaptive tensioning sprocket is proposed, including a hub, a connecting piece, gear teeth, side plates and screws, the gear teeth are arranged in the gear tooth grooves of the hub, each gear tooth is connected to the hub through a separate connecting piece, the connecting piece is a retractable structure, the distance that the gear teeth extend out of the hub is adjustable, the side plates are arranged on both sides of the hub, the side plates are connected to the hub through screws, there is a gap between the outer edge of the side plates and the end face of the gear teeth, the inner cavity of the side plates is provided with oil grooves, and the end faces on both sides of the gear teeth are provided with lubricating oil channels, each lubricating oil channel corresponds to an oil outlet hole connected to the oil groove, and the oil outlet hole is in contact with the end face of the root of the gear tooth.

[0007] The technical solution of the utility model has the advantages of a retractable structure of a connecting piece, after the gear teeth are connected to the wheel hub through the connecting piece, they can be retracted, so that the chain and the gear teeth are always kept taut and meshed tightly, avoiding the chain from wearing and loosening and causing the gear teeth to jump or fall off, and at the same time, the gear teeth can be disassembled and replaced separately after being worn, thereby reducing costs; a structure in which a pressure spring is provided between the connecting pieces, when the gear teeth are meshed with the chain, the pressure spring is compressed by force, and the friction and vibration generated during the meshing are reduced, thereby increasing the service life of the gear teeth; a structure in which a central boss is provided on the side plate and the outer contour is larger than that of the wheel hub and the gear teeth, and there is a gap between the edge of the side plate and the end face of the gear teeth, so that the chain can smoothly enter between the side plates and mesh with the gear teeth, and at the same time, the side plates on both sides can prevent the chain from jumping and falling off; a structure in which the oil outlet hole and the lubricating oil channel are provided, the oil outlet hole is initially fitted with the end face of the gear teeth, and when the gear teeth are meshed with the chain, the gear teeth shrink inwardly, and the lubricating oil channel is fitted with the oil outlet hole, so that the lubricating oil can flow out, thereby reducing the waste of the lubricating oil and achieving high lubrication efficiency.

[0008] Preferably, the bottom of the wheel tooth groove of the wheel hub is provided with a first slot for matching the installation of the connecting piece, both side end faces of the wheel hub are provided with first screw holes for passing screws, the first screw holes on both side end faces are not through, and both side end faces of the wheel hub are also provided with guide grooves for matching the installation of side panels, and the guide grooves are used for guiding and positioning when installing the side panels, so that the side panels can be accurately positioned.

[0009] Preferably, the connecting piece comprises an outer plate, a pressure spring and an inner plate, the outer plate and the inner plate are connected by a pressure spring, the outer surface of the outer plate is provided with a second clamping block for engaging the gear teeth, the outer surface of the inner plate is provided with a first clamping block for engaging the wheel hub, the inner plate and the outer plate are respectively connected to the wheel hub and the gear teeth by clamping, and the installation is convenient. At the same time, the retractable structure of the spring can reduce vibration and friction to a certain extent, reduce the wear of the sprocket and the chain, and the chain can be kept in a tensioned state at all times through retraction and expansion to prevent the chain from jumping teeth or falling off.

[0010] Preferably, the two side end faces of the gear teeth are provided with limit blocks, and the bottom of the gear teeth is provided with a second slot for matching the installation of the connecting piece. The limit blocks cooperate with the limit slot of the side plate to limit the telescopic distance of the gear teeth. The second slot is convenient for installing the connecting piece, and the gear teeth can be replaced individually to reduce costs.

[0011] Preferably, the middle part of the side plate protrudes to form a center boss, the center boss fits with the wheel hub, the height of the center boss is the gap between the side plate and the gear teeth, the center boss is provided with a limit groove matching with the gear teeth, the center boss is provided with a second screw hole, the center boss is also provided with a guide block engaging with the guide groove, the oil outlet hole is also provided on the center boss, the center boss has a certain height to facilitate the chain to enter between the two side plates and mesh with the gear teeth, and the guide groove facilitates the installation and fixation of the side plate.

[0012] Preferably, the distance that the limit block moves in the limit groove is the distance that the connecting member is extended and retracted, and is also the distance that the gear teeth extend out of the wheel hub.

[0013] Preferably, the second screw hole is a countersunk hole, and the first screw hole on one end face of the wheel hub corresponds one to one with the second screw hole on the side plate on this side. The side plate and the wheel hub can be fixed by screws. After fixation, the screws are flush with the surface of the side plate to avoid scratching and entanglement with other objects.

[0014] Preferably, the outer contour of the side plate is larger than the outer contour after the wheel hub is connected to the gear teeth, and the outer surface of the side plate is provided with an oil point hole for adding lubricating oil to the oil tank. The large outer contour of the side plate prevents the chain from falling off, and the oil point hole is convenient for manually adding lubricating oil to maintain lubrication at the sprocket meshing point and reduce wear.

[0015] Preferably, the oil hole fits with the lubricating oil passage when the gear teeth shrink inward, and the lubricating oil can flow out from the oil outlet hole. Therefore, only when the gear teeth are meshed with the chain can the lubricating oil flow out through the lubricating oil passage directly to the meshing point, thus avoiding waste and improving lubrication efficiency.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The technical solution of the utility model adopts the retractable structure of the connecting piece. After the gear teeth are connected to the wheel hub through the connecting piece, they can be retracted, so that the chain and the gear teeth are always kept taut and tightly engaged, avoiding the chain from wearing and loosening and causing tooth jumping or falling off. At the same time, the gear teeth can be disassembled and replaced separately after wear, which reduces costs.

[0018] 2. The technical solution of the utility model is that a pressure spring is arranged between the connecting parts. When the gear teeth are engaged with the connecting chain, the pressure spring is compressed by force, thereby reducing the friction and vibration generated during the engagement and increasing the service life of the gear teeth.

[0019] 3. The technical solution of the utility model is that the side plates are provided with a central boss and the outer contour is larger than the structure of the wheel hub and the gear teeth. There is a gap between the edge of the side plate and the end face of the gear teeth. The chain can smoothly enter between the side plates and engage with the gear teeth. At the same time, the side plates on both sides can prevent the chain from jumping teeth and falling off.

[0020] 4. The technical solution of the utility model, through the structure of the oil outlet hole and the lubricating oil channel, the oil outlet hole is initially in contact with the end face of the gear tooth. When the gear teeth are engaged with the chain, the gear teeth shrink inward, the lubricating oil channel is in contact with the oil outlet hole, and the lubricating oil can flow out, thereby reducing the waste of lubricating oil and improving the lubrication efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional schematic diagram of an adaptive tensioning sprocket;

[0022] Figure 2 An exploded schematic diagram of an adaptive tensioning sprocket structure;

[0023] Figure 3 A partial cutaway schematic diagram of an adaptive tensioning sprocket;

[0024] Figure 4 It is a partially enlarged schematic diagram of an adaptive tensioning sprocket;

[0025] Figure 5 A three-dimensional schematic diagram of an adaptive tensioning sprocket side plate;

[0026] Among them: wheel hub 1, first slot 11, guide slot 12, first screw hole 13, connector 2, outer plate 21, second block 22, pressure spring 23, inner plate 24, first block 25, gear 3, limit block 31, lubricating oil channel 32, second slot 33, side plate 4, center boss 41, oil outlet hole 42, second screw hole 43, limit slot 44, guide block 45, oil groove 46, oil point hole 47, screw 5. DETAILED DESCRIPTION

[0027] The following will be combined with the attached embodiment of the utility model Figure 1-5 , the technical solutions in the embodiments of the utility model are described in detail. Example 1

[0028] like Figure 1-5 As shown, the utility model is an adaptive tensioning sprocket, comprising a hub 1, a connecting member 2, gear teeth 3, a side plate 4 and a screw 5.

[0029] The gear teeth 3 are arranged in the gear tooth groove of the wheel hub 1, each gear tooth 3 is connected to a separate connecting piece 2, and then connected to the wheel hub 3 as a whole. The connecting piece 2 is a retractable structure, and the distance that the gear teeth 3 extend out of the wheel hub 1 is adjustable. The two side plates 4 are arranged on both sides of the wheel hub 1, fit with the wheel hub 1 and are connected to the wheel hub 1 through screws 5.

[0030] There is a gap between the outer edge of the side plate 4 and the end face of the gear tooth 3, and the outer contour of the side plate 4 is larger than the outer contour after the hub 1 is connected to the gear tooth 3. The chain can be inserted between the two side plates 4 through the gap and engage with the gear tooth 3. At the same time, the large outer contour of the side plate prevents the chain from falling off due to loosening or tooth jumping.

[0031] like Figure 2 Figure 4 As shown, the wheel hub 1 is a cylinder with a plurality of gear grooves for mounting the gear teeth 3 formed around it. A first clamping groove 11 is provided at the bottom of the gear groove for fixing one end of the clamping connector 2 .

[0032] Both side end surfaces of the wheel hub 1 are provided with first screw holes 13 , which are not through-holes. The first screw holes 13 are fixing holes for screws 5 , and are used to fix the side plates 4 to the wheel hub 1 .

[0033] The two side end faces of the hub 1 are further provided with guide grooves 12, which are used for positioning and guiding when the side plates 4 are fixedly installed. The guide grooves are square in shape, and the side plates 4 will not be displaced when fixed, so that accurate fixing is facilitated.

[0034] like Figure 2 Figure 4 As shown, the connecting member 2 includes an outer plate 21 , a pressure spring 23 and an inner plate 24 , and the outer plate 21 and the inner plate 24 are connected via the pressure spring 23 .

[0035] A first clamping block 25 is provided on the outer surface of the inner plate 24 of the connecting member 2 . The first clamping block 25 cooperates with the first clamping groove 11 at the bottom of the tooth groove of the wheel hub 1 , so as to connect the connecting member 2 to the wheel hub 1 .

[0036] A second clamping block 22 is provided on the outer surface of the outer plate 21 of the connecting member 2 . The second clamping block 22 cooperates with the second clamping groove 33 at the bottom of the gear tooth 3 to connect the connecting member 2 to the gear tooth 3 .

[0037] Therefore, the connecting member 2 connects the hub 1 and the gear teeth 3 together by snapping, which is easy to operate. When wear occurs, it is convenient to replace the damaged gear teeth 3, thereby reducing costs.

[0038] like Figure 2 Figure 4 As shown, the bottom of the gear tooth 3 is provided with a second slot 33 for matching the mounting connector 2, the cross-sections of the first slot 11 and the second slot 33 are both isosceles trapezoidal, and the first block 25 and the second block 22 can only move along the directions of the first slot 11 and the second slot 33 respectively after being engaged.

[0039] The upper part of the gear tooth 3 is a tooth-shaped block, and the lower part is a square block. The square block matches the shape of the gear tooth groove. The square block has a certain length, and the connecting member 2 is completely located in the gear tooth groove.

[0040] like Figure 2 Figure 4 Figure 5 As shown, the cross section of the side plate 4 is a "convex" shape, and the middle part thereof protrudes to form a central boss 41. The height of the central boss 41 is the gap between the side plate 4 and the end face of the gear tooth 3, and the gap can accommodate the chain meshing with the sprocket.

[0041] A limiting groove 44 is provided on the central boss 41 , and limiting blocks 31 are provided on both side end faces of the gear teeth 3 . When the central boss 41 of the side plate 4 is attached to and fixed to the wheel hub 1 , the limiting blocks 31 are located in the limiting groove 44 , and the limiting blocks 31 are flush with the limiting groove 44 .

[0042] The distance that the limit block 31 moves in the limit groove 44 is the distance that the connecting member 2 is extended and retracted, and is also the distance that the gear 3 extends out of the hub 1. The maximum distance that the limit block 31 moves is the maximum distance that the gear 3 can change after extending out of the hub 1. When the limit block 31 is located inside the limit groove 44, the pressure spring 23 of the connecting member 2 is always in a compressed state.

[0043] like Figure 1-5 As shown, when the gear 3 is engaged with the chain, the limiting block 31 is at different positions in the limiting groove 44 .

[0044] When the limit block 31 is located at one end of the limit groove 44 close to the center of the side plate 4, the gear teeth 3 are meshed with the chain and maintain the required tension. With long-term use, the chain and the gear teeth 3 are worn, and the chain will loosen. At this time, the gear teeth 3 will be affected by the pressure spring 23 of the connecting piece 2, expand and contract outward, mesh with the chain and maintain tension.

[0045] When the limit block 31 is located at the end of the limit groove 44 away from the center of the side plate 4, it indicates that the chain is very loose and the self-tensioning of the gear teeth 3 can no longer keep the chain at the required appropriate tension, and the chain needs to be adjusted.

[0046] like Figure 2 Figure 4 Figure 5 As shown, a second screw hole 43 is permanently provided on the center boss 41 for the screw 5 to pass through. The second screw hole 43 on the side plate 4 corresponds one to one with the first screw hole 13 on the end face of one side of the wheel hub 1. The screw 5 passes through the second screw hole 43 and the first screw hole 13 in sequence to fix the side plate 4 on the end face of the wheel hub 1.

[0047] The second screw hole 43 is a countersunk hole. After the screw 5 fixes the side plate 4, the screw 5 is flush with the side plate 4 to avoid scratching or tangling with other objects, which may affect the normal operation of the sprocket.

[0048] A guide block 45 that cooperates with the guide groove 12 is provided on the central boss 41 to facilitate positioning of the side plate 4 during installation.

[0049] The inner cavity of the central boss 41 of the side plate 4 is a hollow structure, and an oil groove 46 is provided in the inner cavity. Lubricating oil channels 32 are provided on both side end faces of each gear tooth 3, and each lubricating oil channel 32 corresponds to an oil outlet hole 42. The oil outlet hole 42 is arranged on the central boss 41, and the oil outlet hole 41 is connected to the oil groove 46.

[0050] like Figure 2 Figure 4 Figure 5 As shown, an outer surface of the side plate 4 away from the central boss 41 is provided with an oil point hole 47 for adding lubricating oil to the oil groove 46 . When the sprocket rotates, the lubricating oil flows from the oil groove 46 to the oil outlet hole 42 under the influence of centrifugal force.

[0051] When the gear teeth 3 are not meshed with the chain, the oil outlet hole 42 is in contact with the end surface of the root of the gear teeth 3, and the lubricating oil cannot flow out of the oil outlet hole 42, thereby avoiding the waste of lubricating oil.

[0052] When the gear 3 meshes with the chain and contracts inward, the oil outlet hole 42 fits with the lubricating oil channel 32, and the lubricating oil channel is lower than the end face of the gear 3. The lubricating oil can flow out of the oil outlet hole 42 and then pass through the lubricating oil channel directly to the meshing point of the gear 3 and the chain, thereby improving the lubrication efficiency.

[0053] When the chain is too loose, it meshes with the gear teeth 3 but the gear teeth 3 do not shrink inwards and the lubricating oil does not flow out.

[0054] A method for using an adaptive tensioning sprocket in this embodiment is as follows:

[0055] Take a side plate 4, make the central boss 41 of the side plate 4 face the wheel hub 1, and align the guide block 45 on the central boss 41 with the guide groove 12 on one side of the wheel hub 1, so that the central boss 41 of the side plate 4 fits with the wheel hub 1, and fix it with screws 5, and then connect the gear 3 to the outer plate 21 of the connecting member 2 by snapping, and then snap it into the gear groove on the wheel hub 1 from the side where the side plate 4 is not installed, and insert the first clamping block 25 on the inner plate 24 of the connecting member 2 into the bottom of the gear groove. In the first slot 11, adjust the gear 3 so that the limit block 31 on its end face is inserted into the limit slot 44 of the side plate 4, and complete the installation of all the gear teeth 3 in sequence. Then take another side plate 4, align the guide block 45 with the guide slot 12 on this side of the hub 1 and fit it, and confirm that the limit blocks 31 of all the gear teeth 3 are located in the limit slots 44 of the two side plates 4, fix the side plate 4 with the screws 5, add lubricating oil to the oil groove 46 through the oil hole 47, and the sprocket is assembled and can be put into use.

[0056] When in use, when the chain is engaged with the gear teeth 3, the gear teeth 3 will shrink inward, and the limit block 31 will fit the end of the limit groove 44 close to the center of the circle. After long-term use, the chain and the gear teeth 3 will wear, the chain will become loose, and the gear teeth 3 will expand and contract outward under the action of the pressure spring 23 of the connecting piece 2, so that the chain maintains a suitable tension and will not fall off due to looseness. When it is observed that the limit block 31 of the gear teeth 3 at the meshing point fits the end of the limit groove 44 away from the center of the circle, it indicates that the chain is severely worn and too loose, and the gear teeth 3 cannot complete the tensioning by their own expansion and contraction, and the chain needs to be replaced and adjusted.

[0057] When the gear teeth 3 are not engaged with the chain and shrink inward, the oil outlet hole 42 of the oil groove 46 fits with the root end face of the gear teeth 3, and the lubricating oil cannot flow out. When the gear teeth 3 shrink inward, the oil outlet hole 42 fits with the lubricating oil passage 32, and the lubricating oil flows out through the lubricating oil passage 32, lubricating the unengaged part, with high lubrication efficiency and avoiding waste of lubricating oil. When the chain is too loose, it is engaged with the gear teeth 3 at this time, the gear teeth 3 do not shrink, and the lubricating oil will not flow out, reducing waste.

[0058] The above embodiments are only for illustrating the technical idea of ​​the present utility model, and cannot be used to limit the protection scope of the present utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An adaptive tensioning sprocket, characterized in that: The invention comprises a wheel hub (1), a connecting member (2), a gear tooth (3), a side plate (4) and a screw (5), wherein the gear tooth (3) is arranged in a gear tooth groove of the wheel hub (1), each gear tooth (3) is connected to the wheel hub (1) via a separate connecting member (2), the connecting member (2) is a retractable structure, and the distance by which the gear tooth (3) extends out of the wheel hub (1) is adjustable; the side plates (4) are arranged on both sides of the wheel hub (1), the side plates (4) are connected to the wheel hub (1) via screws (5), a gap is provided between the outer edge of the side plates (4) and the end face of the gear tooth (3), an oil groove (46) is provided in the inner cavity of the side plates (4), and lubricating oil channels (32) are provided on both side end faces of the gear tooth (3), each lubricating oil channel (32) corresponds to an oil outlet hole (42) connected to the oil groove (46), and the oil outlet hole (42) is in contact with the end face of the root of the gear tooth (3).

2. The adaptive tensioning sprocket according to claim 1, characterized in that: The bottom of the wheel tooth groove of the wheel hub (1) is provided with a first slot (11) for matching the mounting of the connecting piece (2), and both side end surfaces of the wheel hub (1) are provided with first screw holes (13) for passing screws (5), and the first screw holes (13) on both side end surfaces are not through-going. Both side end surfaces of the wheel hub (1) are also provided with guide slots (12) for matching the mounting of the side plates (4).

3. The adaptive tensioning sprocket according to claim 1, characterized in that: The connecting member (2) comprises an outer plate (21), a pressure spring (23) and an inner plate (24); the outer plate (21) and the inner plate (24) are connected via the pressure spring (23); the outer surface of the outer plate (21) is provided with a second clamping block (22) for engaging with the gear teeth (3); and the outer surface of the inner plate (24) is provided with a first clamping block (25) for engaging with the wheel hub (1).

4. The adaptive tensioning sprocket according to claim 2, characterized in that: Limit blocks (31) are provided on both side end surfaces of the gear teeth (3), and a second clamping groove (33) for matching the mounting connection piece (2) is provided at the bottom of the gear teeth (3).

5. The adaptive tensioning sprocket according to claim 4, characterized in that: The middle part of the side plate (4) protrudes to form a central boss (41), the central boss (41) is fitted with the wheel hub (1), the height of the central boss (41) is equal to the gap between the side plate (4) and the gear teeth (3), the central boss (41) is provided with a limit groove (44) matching with the gear teeth (3), the central boss (41) is provided with a second screw hole (43), the central boss (41) is also provided with a guide block (45) engaging with the guide groove (12), and the oil outlet hole (42) is also provided on the central boss (41).

6. The adaptive tensioning sprocket according to claim 5, characterized in that: The distance that the limiting block (31) moves in the limiting groove (44) is the distance that the connecting member (2) is extended and retracted.

7. The adaptive tensioning sprocket according to claim 5, characterized in that: The second screw hole (43) is a countersunk hole, and the first screw hole (13) on the end surface of one side of the hub (1) corresponds one to one with the second screw hole (43) on the side plate (4) on the same side.

8. The adaptive tensioning sprocket according to claim 1, characterized in that: The outer contour of the side plate (4) is larger than the outer contour of the wheel hub (1) and the gear teeth (3) after being connected, and the outer surface of the side plate (4) is provided with an oil point hole (47) for adding lubricating oil to the oil groove (46).

9. The adaptive tensioning sprocket according to claim 1, characterized in that: When the gear teeth (3) shrink inwardly, the oil hole (42) fits into the lubricating oil passage (32), and the lubricating oil can flow out from the oil outlet hole (42).

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