Synchronous belt box capable of easily and accurately positioning synchronous belt wheel

Abstract

The synchronous belt box comprises a bottom plate, a synchronous belt, a driving belt wheel and a driven belt wheel, an output shaft of a high-speed electric cylinder and an input shaft of a low-speed output mechanism extend into the synchronous belt box from the bottom plate, and are fixedly connected with the driving belt wheel and the driven belt wheel in the synchronous belt box through tensioning sleeves respectively. A positioning reference surface is arranged on the inner plane of the bottom plate, and the driving belt wheel and the driven belt wheel respectively position the mounting positions through positioning bearings by taking the positioning reference surface as a reference; a positioning bearing with the same thickness is arranged between the driven belt wheel and the positioning reference surface, sleeves the input shaft and is used for positioning the position of the driven belt wheel and enabling the driven belt wheel to rotate relative to the positioning reference surface; according to the synchronous belt box, the uniform or coplanar positioning reference with high precision is arranged on the bottom plate, the belt wheels are positioned by combining the positioning bearings, the relative positioning precision of the two belt wheels is easy to guarantee, the belt wheels can be quickly and reliably positioned, and universal assembly is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission, in particular to a synchronous belt box which is easy to accurately position a synchronous belt wheel. Background Art

[0002] Due to the different structures and installation interfaces of the motor and reducer, the motor and reducer cannot be installed directly, and power cannot be transmitted directly. A transition device must be used to transmit power. The transition device can generally use a gear set or a synchronous belt for power transmission. Since the gear set device requires lubrication and sealing, the structure is more complex and the weight is heavier, so synchronous belt transmission is more often used.

[0003] Since the motor output shaft is equipped with a motor sleeve and the reducer input shaft is equipped with an input sleeve, they are used to reserve installation space for the mounting plate and position the transmission pulley. Since the motor sleeve and the input sleeve have various length specifications and since the motor needs to be installed with a tensioning mechanism, the installation bases of the motor and the reducer are different during installation. Therefore, the pulleys on the motor output shaft and the reducer input shaft have different positioning bases, and it is not easy to ensure the positioning accuracy. If the driving pulley and the driven pulley are positioned on different planes, the synchronous belt will be misaligned for transmission, the transmission will be unreliable, the synchronous belt will easily fall off, and the service life of the synchronous belt will be shortened. The prior art adjusts the installation by replacing the sleeve or adding washers during installation, but the installation efficiency is low, the positioning accuracy is low, and it is not easy to achieve universal assembly. In addition, the positions of the driving pulley and the driven pulley must be maintained during transmission work to prevent the two from moving along the axis and causing misaligned transmission of the synchronous belt. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a synchronous belt box which is easy to accurately position the synchronous belt wheel, so as to solve one or more problems raised in the above background technology.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A synchronous belt box that is easy to accurately position a synchronous belt pulley comprises a base plate, a synchronous belt, a driving pulley and a driven pulley, a low-speed output mechanism and a high-speed electric cylinder are mounted on the outer plane of the base plate, the output shaft of the high-speed electric cylinder extends from the base plate into the synchronous belt box, and is fixedly connected to the driving pulley in the synchronous belt box through a tensioning sleeve, and the input shaft of the low-speed output mechanism extends from the base plate into the synchronous belt box, and is also fixedly connected to the driven pulley in the synchronous belt box through a tensioning sleeve; a positioning reference surface is provided on the inner plane of the base plate, the driving pulley uses the positioning reference surface as a reference, and the mounting position of the driving pulley on the output shaft is positioned by a positioning bearing sleeved on the output shaft, and the positioning bearing is used to rotate the driving pulley relative to the positioning reference surface; a positioning bearing of the same thickness is provided between the driven pulley and the positioning reference surface, and the positioning bearing is sleeved on the input shaft, and is used to position the driven pulley and rotate the driven pulley relative to the positioning reference surface.

[0007] Furthermore, it also includes a tensioning mechanism, which includes a tensioning plate. The tensioning plate is a step-layer structure, and an adjustment hole is opened on the bottom plate. The inner end of the tensioning plate is inserted into the adjustment hole and can be slid along the adjustment hole for horizontal adjustment. The outer end face of the tensioning plate is clamped on the outer plane of the bottom plate; the low-speed output mechanism is installed on the inner end face of the tensioning plate, and an installation reference surface coplanar with the positioning reference surface is provided on the inner end face of the tensioning plate, and one end face of the positioning bearing sleeved on the output shaft rests on the installation reference surface.

[0008] Furthermore, the positioning bearing is a crossed roller bearing, the inner and outer rings of one crossed roller bearing are detachably connected to the tensioning plate and the driving pulley respectively, and the inner and outer rings of the other crossed roller bearing are detachably connected to the base plate and the driven pulley respectively.

[0009] Furthermore, the positioning bearing is a plane bearing, and the end of the output shaft is detachably connected with an anti-slip plate, which is clamped outside the shaft hole of the driving pulley; the end of the input shaft is also detachably connected with an anti-slip plate, which is clamped outside the shaft hole of the driven pulley.

[0010] Furthermore, the tensioning plate and the bottom plate are both provided with mounting grooves for mounting positioning bearings on the input shaft and the output shaft, and the bottom surfaces of the mounting grooves are respectively the positioning reference surface and the mounting reference surface.

[0011] Furthermore, the tensioning sleeve on the driven pulley includes a tensioning outer ring of the tensioning connection wheel shaft and a tensioning inner ring of the tensioning connection input shaft. Both the tensioning outer ring and the tensioning inner ring are axially penetrated at both ends to open expansion notches. The tensioning inner ring is inserted into the tensioning outer ring. Both include a connecting part and a tensioning part. The connecting part of the two is connected by screws to adjust the tensioning degree. A tensioning cone surface is provided on the tensioning part. The tensioning part is driven to deform by the connecting part sliding along the tensioning cone surface to achieve a tensioning connection.

[0012] Furthermore, the tensioning sleeve on the driving pulley includes a coupling ring and a connecting hole ring. Both the coupling ring and the connecting hole ring are provided with expansion notches axially through both ends. The coupling ring has the same structure as the tensioning inner ring, and also includes a connecting part and a tensioning part. The connecting part of the coupling ring is connected to the end face of the connecting hole ring by screws. The outer peripheral surface of the tensioning part of the coupling ring is a tensioning cone surface. The connecting hole ring moves along the tensioning cone surface, deforms itself, and drives the tensioning part of the coupling ring to deform synchronously to achieve a tensioning connection.

[0013] Furthermore, the outer circumferential surface of the tensioning sleeve is formed with two symmetrical anti-slip surfaces by axial beveling, and two anti-slip inserts are symmetrically arranged in the axial holes of the driven pulley and the driving pulley. After tensioning and installation, the anti-slip inserts are matched and connected with the anti-slip surfaces to generate an anti-slip component force along the axial direction and toward the base plate.

[0014] Compared with the prior art, the utility model provides a synchronous belt cassette which is easy to accurately position the synchronous pulley. It eliminates the prior art method of using a sleeve to position the pulley, sets a uniform or coplanar positioning reference with high precision on the bottom plate, and positions the pulley in combination with a positioning bearing. It overcomes the problem of the pulleys being positioned on different planes due to the structural size differences and installation differences between the low-speed output mechanism, the high-speed electric cylinder and the connecting shafts of the two in the sleeve positioning method. The relative positioning accuracy of the driving pulley and the driven pulley is easy to ensure, and the pulleys can be quickly and reliably positioned, which is conducive to universal assembly. In addition, the positioning bearing can also provide another support point in the shaft, which can improve the rigidity of the output shaft and the input shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional structural diagram of the synchronous belt box assembly of the utility model;

[0016] Figure 2 It is an exploded view of the synchronous belt box assembly of the utility model example;

[0017] Figure 3 A schematic cross-sectional structure diagram of a synchronous belt cassette according to an example of the present utility model;

[0018] Figure 4 for Figure 3 A partial enlarged view of point I in the middle;

[0019] Figure 5 for Figure 3 A partial enlarged view of point II in the middle.

[0020] In the figure: 1. low-speed output mechanism; 2. high-speed electric cylinder; 3. bottom plate; 31. adjustment hole; 4. driven pulley; 41. anti-slip insert; 5. driving pulley; 6. tensioning plate; 61. mounting groove; 7. anti-slip stop plate; 8. first tensioning sleeve; 81. anti-slip inclined surface; 82. tensioning outer ring; 83. tensioning inner ring; 9. second tensioning sleeve; 91. coupling ring; 92. connecting hole ring; 10. positioning bearing; 11. tensioning screw; 12. synchronous belt. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only the best embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-Figure 5 A synchronous belt cassette that is easy to accurately position a synchronous belt pulley is shown, and the synchronous belt cassette includes an outer cover shell (not shown), a bottom plate 3, a synchronous belt 12, a driving pulley 5 and a driven pulley 4. The outer cover shell and the bottom plate 3 are assembled to form a box body structure, the driving pulley 5, the driven pulley 4 and the synchronous belt 12 that synchronously connects the driving pulley 5 and the driven pulley 4 are arranged in the box body, and the low-speed output mechanism 1 and the high-speed electric cylinder 2 are located outside the box body, and both are fixedly mounted on the outer plane of the bottom plate 3;

[0023] The output shaft of the high-speed electric cylinder 2 extends from the bottom plate 3 into the synchronous belt box, and the shaft and the hole are connected by a pull-out structure lossless connection method. Since the active pulley 5 is a high-speed low-torque output end, the active pulley 5 and the output shaft are preferably connected by a second tension sleeve 9 structure for detachable tensioning. Figure 4 As shown, the second tensioning sleeve 9 includes a coupling ring 91 and a connecting hole ring 92. Both the coupling ring 91 and the connecting hole ring 92 are provided with expansion notches at both ends along the axial direction. The coupling ring 91 includes a connecting portion and a tensioning portion. The wall thickness of the connecting portion is greater than that of the tensioning portion. The tensioning portion is easy to deform and clamp the output shaft. The outer peripheral surface of the tensioning portion is a conical surface structure, that is, a tensioning cone surface. The connecting hole ring 92 has a uniform wall thickness and has a large rigidity. Its end face is connected to the connecting portion of the coupling ring 91 by a withdrawal screw, so that the connecting hole ring 92 is forced to continuously move along the tensioning cone surface. As the gap between the tensioning portion and the shaft hole continues to decrease, the connecting hole ring 92 is deformed and tensioned to connect the shaft hole of the active pulley 5. At the same time, the tensioning portion is squeezed and deformed to clamp the output shaft.

[0024] The input shaft of the low-speed output mechanism 1 extends from the bottom plate 3 into the synchronous belt box, and the shaft and the hole are connected by a pull-out structure lossless connection method. Since the driven pulley 4 is a low-speed high-torque output end, the driven pulley 4 and the input shaft are preferably connected by a first tensioning sleeve 8 structure for detachable tensioning. Figure 5 As shown, the first tensioning sleeve 8 includes a tensioning outer ring 82 for tensioning the wheel shaft and a tensioning inner ring 83 for tensioning the input shaft. Both the tensioning outer ring 82 and the tensioning inner ring 83 are provided with expansion notches along the axial direction at both ends. In order to increase the tensioning connection area and ensure the torque transmission reliability, the tensioning outer ring 82 and the tensioning inner ring 83 both include a connecting portion and a tensioning portion. The wall thickness of the connecting portion is greater than that of the tensioning portion. The tensioning inner ring 83 is inserted into the tensioning outer ring 82. The inner circumference of the tensioning portion of the tensioning outer ring 82 and the tensioning inner ring The outer peripheral surface of the tensioning part of 83 is a tensioning cone surface. The connection part of the tensioning outer ring 82 and the tensioning inner ring 83 is connected by a withdrawal screw to apply a tensioning thrust. The connection part of the tensioning outer ring 82 moves along the large end of the tensioning cone surface of the tensioning inner ring 83, squeezing the tensioning part of the tensioning inner ring 83 to deform and tighten the input shaft. At the same time, the connection part of the tensioning inner ring 83 moves along the small hole end of the tensioning cone surface of the tensioning outer ring 82, expanding the tensioning part of the tensioning outer ring 82 to deform and press the shaft hole of the driven pulley 4.

[0025] In order to unify the reference positioning of the active pulley 5 and the driven pulley 4, for the power device directly mounted with the high-speed electric cylinder 2, a positioning reference surface is provided on the inner plane of the bottom plate 3. The active pulley 5 and the driven pulley 4 both use the positioning reference surface on the bottom plate 3 as the installation reference. Since the shaft sleeve is cancelled, in order to reserve a certain space between the bottom plate 3 and the pulley to avoid motion interference, a positioning bearing 10 of the same thickness is provided between the active pulley 5 and the bottom plate 3 and between the driven pulley 4 and the bottom plate 3. One end face of the positioning bearing 10 abuts against the positioning reference surface. The active pulley 5 and the driven pulley 4 are positioned by the other end face of the positioning bearing 10 and are connected by a tension sleeve to improve the relative positioning accuracy of the two pulleys. The positioning bearing 10 can also provide the rotational freedom of the pulley relative to the bottom plate 3.

[0026] For a power device with a tensioning mechanism, generally the high-speed electric cylinder 2 is installed on the tensioning mechanism, and an adjustment hole 31 needs to be opened on the bottom plate 3, such as Figure 1-Figure 2As shown, the tensioning mechanism includes a tensioning plate 6 and a tensioning screw 11. The tensioning plate 6 is guided by the adjustment hole 31 for sliding tensioning adjustment. The tensioning screw 11 is arranged on one side of the adjustment hole 31 and extends into the adjustment hole 31 to connect one end of the tensioning plate 6. It can be understood that the installation of the active pulley 5 and its positioning bearing 10 needs to be based on the tensioning plate 6. In order to ensure that the reference on the tensioning plate 6 coincides with the positioning reference surface on the base plate 3, the tensioning plate 6 is designed as a stepped layer structure. The inner end of the tensioning plate 6 is inserted into the adjustment hole 31, and its upper and lower side surfaces cooperate with the adjustment hole 31 to obtain a sliding lateral sliding guide. The outer end face of the tensioning plate 6 is clamped on the outer plane of the base plate 3; when the positioning reference plane adopts the inner plane of the base plate 3, in order to ensure that the inner end plane of the tensioning plate 6 coincides with the inner plane of the base plate 3 to obtain a coincident positioning reference, when the tensioning plate 6 is processed, the inner layer of the tensioning plate 6 is processed by profiling, that is, the tensioning plate 6 is clamped and installed on the base plate 3, and the inner end plane of the tensioning plate 6 and the inner plane of the base plate 3 are uniformly milled as a whole. At this time, the inner end plane of the tensioning plate 6 can be regarded as the positioning reference plane of the base plate 3, and the driving pulley 5 and the driven pulley 4 have a positioning reference with a high degree of coincidence.

[0027] The locating bearing 10 may be a cross roller bearing (not shown) or a plane bearing (such as Figure 1-Figure 5 As shown), if a cross roller bearing is selected, the inner end plane of the tension plate 6 and the inner plane of the bottom plate 3 can be used as the positioning reference, wherein the inner and outer rings of the cross roller bearing on the output shaft are detachably connected to the tension plate 6 and the driving pulley 5, respectively, and the inner and outer rings of the cross roller bearing on the input shaft are detachably connected to the bottom plate 3 and the driven pulley 4, respectively. The cross roller bearing can further fix the pulley to prevent the pulley from axial movement, but the driving pulley 5 and the driven pulley 4 need to be processed with mounting holes for mounting the cross roller bearing;

[0028] If the locating bearing 10 is a plane bearing, it is not necessary to further install and process the driving pulley 5 and the driven pulley 4. However, in order to further prevent the axial movement of the pulley, Figure 1-Figure 2 As shown, the ends of the output shaft and the input shaft are detachably connected with an anti-collision stop plate 7, which is clamped outside the shaft holes of the driving pulley 5 and the driven pulley 4, and uses the shaft connection force to apply an anti-collision force toward the positioning bearing 10 on the outside of the driving pulley 5 and the driven pulley 4, thereby limiting the axial movement of the driving pulley 5 and the driven pulley 4;

[0029] It can be understood that since the plane bearing is gap-sleeved on the input shaft and the output shaft, in order to prevent the plane bearing from slipping on the inner plane of the base plate 3 and the inner end plane of the tensioning plate 6, the tensioning plate 6 and the base plate 3 are both provided with mounting grooves 61 for installing the locating bearing 10. Therefore, the bottom surfaces of the mounting grooves 61 are respectively the positioning reference surface and the mounting reference surface. In order to ensure the coplanarity of the bottom surfaces of the two mounting grooves 61, similarly, before processing the mounting grooves 61, the tensioning plate 6 is clamped and installed on the base plate 3, and the mounting grooves 61 on the tensioning plate 6 and the base plate 3 are milled successively with the same tool coordinate system and cutting amount to ensure that the references of the two coincide.

[0030] As a further technical solution, two symmetrical anti-slip bevels 81 are arranged on the outer circumference of the first tensioning sleeve 8 and the second tensioning sleeve 9. The anti-slip bevels 81 are formed by milling at an inclination with the axial direction. To match them, two anti-slip inserts 41 are symmetrically arranged in the axial holes of the driven pulley 4 and the driving pulley 5. After tensioning and installation, the anti-slip bevels 81 fit the anti-slip inserts 41. When the transmission is working, the radial component force applied by the synchronous belt 12 on the driving pulley 5 and the driven pulley 4 is used to generate an anti-slip component force along the axial direction and toward the base plate 3 through the anti-slip bevels 81, so that the pulleys are self-limiting and anti-slip.

[0031] The directional words such as "outside", "inside", "horizontal", "end" and "side" mentioned in this article are based on Figure 1-Figure 5 The orientation or position relationship shown in the relevant drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation; in addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance;

[0032] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the terms "on" and "inside" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A synchronous belt cassette that is easy to accurately position a synchronous belt pulley, characterized in that: include: A base plate, a synchronous belt, a driving pulley and a driven pulley, a low-speed output mechanism and a high-speed electric cylinder are installed on the outer plane of the base plate, the output shaft of the high-speed electric cylinder extends from the base plate into the synchronous belt box, and is fixedly connected to the driving pulley in the synchronous belt box through a tensioning sleeve, the input shaft of the low-speed output mechanism extends from the base plate into the synchronous belt box, and is also fixedly connected to the driven pulley in the synchronous belt box through the tensioning sleeve; a positioning reference surface is provided on the inner plane of the base plate, the driving pulley takes the positioning reference surface as a reference, and positions the installation position of the driving pulley on the output shaft through a positioning bearing sleeved on the output shaft, and the positioning bearing is used to make the driving pulley rotate relative to the positioning reference surface; a positioning bearing of the same thickness is provided between the driven pulley and the positioning reference surface, and the positioning bearing is sleeved on the input shaft, and is used to position the driven pulley and make the driven pulley rotate relative to the positioning reference surface.

2. The synchronous belt cassette for facilitating accurate positioning of synchronous belt pulleys according to claim 1, characterized in that: It also includes a tensioning mechanism, which includes a tensioning plate. The tensioning plate is a step-layer structure, and an adjustment hole is opened on the bottom plate. The inner end of the tensioning plate is inserted into the adjustment hole and can be slid along the adjustment hole for transverse adjustment. The outer end of the tensioning plate is clamped on the outer plane of the bottom plate; the low-speed output mechanism is installed on the inner end plane of the tensioning plate, and the inner end plane of the tensioning plate is provided with a mounting reference surface coplanar with the positioning reference surface, and one end face of the positioning bearing rests on the mounting reference surface.

3. The synchronous belt cassette for facilitating accurate positioning of synchronous belt pulleys according to claim 2, characterized in that: The locating bearing is a plane bearing, and the end of the output shaft is detachably connected with an anti-slip plate, and the anti-slip plate is clamped outside the shaft hole of the driving pulley; the end of the input shaft is also detachably connected with the anti-slip plate, and the anti-slip plate is clamped outside the shaft hole of the driven pulley.

4. The synchronous belt cassette for facilitating accurate positioning of synchronous belt pulleys according to claim 2, characterized in that: The locating bearing is a crossed roller bearing, the inner and outer rings of one crossed roller bearing are detachably connected to the tensioning plate and the driving pulley respectively, and the inner and outer rings of the other crossed roller bearing are detachably connected to the base plate and the driven pulley respectively.

5. The synchronous belt cassette for facilitating accurate positioning of synchronous belt pulleys according to claim 3, characterized in that: The tensioning plate and the bottom plate are both provided with mounting grooves for mounting the positioning bearings on the input shaft and the output shaft, and the bottom surfaces of the mounting grooves are the positioning reference surface and the mounting reference surface respectively.

6. The synchronous belt cassette for facilitating accurate positioning of synchronous belt pulleys according to claim 1, characterized in that: The tensioning sleeve on the driven pulley includes a tensioning outer ring for tensioning the connecting shaft hole and a tensioning inner ring for tensioning the input shaft, the tensioning outer ring and the tensioning inner ring both axially penetrate through both ends to form expansion notches, the tensioning inner ring is inserted into the tensioning outer ring, both include a connecting part and a tensioning part, the connecting parts of the two are connected by screws for relative movement and adjustment, a tensioning cone surface is provided on the tensioning part, and the tensioning part is driven to deform by the connecting part sliding along the tensioning cone surface to achieve a tensioning connection.

7. The synchronous belt cassette for facilitating accurate positioning of synchronous belt pulleys according to claim 6, characterized in that: The tensioning sleeve on the driving pulley includes a coupling ring and a connecting hole ring, both of which are axially penetrated at both ends to form expansion notches, the coupling ring has the same structure as the tensioning inner ring, including a connecting portion and a tensioning portion, the connecting portion of the coupling ring is connected to the end face of the connecting hole ring by screws, the outer peripheral surface of the tensioning portion of the coupling ring is the tensioning cone surface, the connecting hole ring moves along the tensioning cone surface, deforms itself and drives the tensioning portion of the coupling ring to deform synchronously to achieve a tensioning connection.

8. The synchronous belt cassette for facilitating accurate positioning of synchronous belt pulleys according to claim 7, characterized in that: The outer peripheral surface of the tensioning sleeve is formed with two symmetrical anti-slip surfaces by axial beveling, and two anti-slip inserts are symmetrically arranged in the axial holes of the driven pulley and the driving pulley. After tensioning and installation, the anti-slip inserts are matched and connected with the anti-slip surfaces to generate an anti-slip component force along the axial direction and toward the base plate.

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