Toothed belt shaft with clamping device

Abstract

The invention relates to a toothed belt shaft having a toothed belt, a toothed belt reel, a deflection element, a profiled body extending along a movement axis, a slider and a clamping device, the slider having a first end face into which a first receiving opening extending along the movement axis for receiving the clamping device is introduced, the toothed belt can be driven by means of a toothed belt reel and can be deflected by means of a deflection element, the slide can be moved in the profile body by means of the toothed belt, and wherein the clamping device has a clamping body, a pressure plate, an endless support body and a pressure element, the clamping body has a front side, a rear side, a receiving space configured as a slot, and a support section.

Description

Technical Field

[0001] The invention relates to a toothed belt shaft with a clamping device. Background Art

[0002] In the toothed belt shafts known from the prior art, a force-transmitting connection between the end region of the toothed belt and the slide is known by means of a clamping device. The clamping device can be used to transmit the tensile force introduced into the toothed belt by the drive device to the slide accommodated linearly and movably in the profile body. The known clamping device has a clamping body, which is provided with a groove for accommodating the end region of the toothed belt, wherein the toothed belt can be accommodated in the groove in a force-fitting and / or form-fitting manner. In addition, connecting means are provided in order to fasten the clamping body to the slide. Summary of the invention

[0003] The object of the present invention is to provide a toothed belt shaft which is easy to handle and convenient to produce.

[0004] This object is achieved by a toothed belt shaft having the features listed below:

[0005] The toothed belt shaft according to the present invention comprises a toothed belt, a toothed belt pulley, a deflection element, a profile body extending along a movement axis, a slider and a clamping device, wherein the slider has a first end face, into which a first receiving opening extending along the movement axis for accommodating the clamping device is introduced, wherein the profile body is constructed for linearly movably guiding the slider, wherein the toothed belt can be driven by means of the toothed belt pulley and can be deflected by means of the deflection element, wherein the slider can be moved in the profile body by means of the toothed belt, wherein the clamping device comprises a clamping body, a pressure plate, a support body of an annular structure and a pressure element, wherein the clamping body comprises a front side, a rear side, a receiving space constructed as a groove and a supporting section, wherein the receiving space extends from the front side along the movement axis and penetrates the clamping body transversely to the movement axis. The invention relates to a body, wherein the receiving space has a first inner surface and a second inner surface opposite to the first inner surface, wherein the pressure plate has a pressure plate upper side with teeth and a pressure plate lower side, wherein the toothed belt has a toothed belt inner side with teeth, a toothed belt outer side and at least one end region, wherein the pressure plate and the end region are received in the receiving space in such a way that the toothed belt outer side faces the second inner surface, the pressure plate lower side faces the first inner surface and the toothed belt inner side faces the pressure plate upper side, wherein the teeth on the pressure plate upper side are constructed complementary to the teeth on the toothed belt inner side, wherein the pressure plate is pressed against the toothed belt by means of a pressure element abutting against the pressure plate lower side so as to press the toothed belt outer side against the second inner surface, wherein the support body surrounds the support section in order to prevent an expansion of the receiving space, in particular caused by the pressure element.

[0006] The expansion of the clamping body may cause the toothed belt to slip out of the receiving space, thereby adversely affecting the operational safety of the toothed belt shaft. In addition, the expansion of the clamping body may cause the clamping device to get stuck in the receiving opening, which adversely affects the simple removal of the clamping device from the slide, and damage to the slide and / or the clamping device may occur.

[0007] The expansion of the receiving space is manifested as an increase in the distance between the first inner surface and the second inner surface and is thereby prevented according to the invention from causing the force flow introduced into the clamping body via the pressure element and the pressure plate to be diverted away from the support ring by means of the support ring so that the force flow does not lead to a deformation of the clamping body.

[0008] By providing the first receiving opening, the clamping device can be at least partially sunk into the slide, thereby reducing the required structural space. In addition, the clamping device can be inserted into the first receiving opening to such an extent that there is no risk of the support ring sliding off the support section starting from the functional position (in which the support ring surrounds the support section), thereby adversely affecting the function of the support ring. The front side is the side of the clamping body that faces away from the slide during operation and via which the toothed belt can be inserted into the receiving space. The rear side is the side of the clamping body that faces the slide during operation, that is, the side that first enters the first receiving opening when the clamping device is inserted into the first receiving opening. The inner side of the toothed belt is the side of the toothed belt that rests on the toothed belt disk during operation. The outer side of the toothed belt is the side of the toothed belt that points away from the toothed belt disk during operation. By pressing the pressure plate against the toothed belt, the form fit between the toothed belt and the clamping body is strengthened, thereby reducing the risk of the toothed belt sliding out.

[0009] The support body can preferably be moved into the functional position by pushing on, but also by screwing on or pressing on. A clearance fit is preferably provided between the outer contour of the clamping device and the inner contour of the first receiving opening. The length of the support ring extending along the axis of movement and / or the thickness of the support ring can be selected according to the loads to be expected therefrom. Thus, in the case of low loads, a short support ring with a small thickness can be provided, and in the case of high loads, a long support ring with a large thickness can be provided.

[0010] Preferably, the pressure element is designed as a screw, in particular a space-saving threaded pin, and the clamping body has a thread for screwing the screw in. The thread extends transversely to the movement axis from an outer circumferential surface of the clamping body, in particular of cylindrical design, into the receiving space.

[0011] Preferably, the deflection element is designed as a deflection roller or a toothed belt pulley.

[0012] Preferably, the support body is designed in an annular shape. Therefore, the support body can be mounted on the support section in any rotational orientation.

[0013] Preferably, the supporting section is at least partially annular in shape, in particular at least partially circular in shape.

[0014] Preferably, the first inner surface and the second inner surface are oriented parallel to each other.

[0015] Further developments of the invention are characterized by the subject matter of the dependent claims having the features listed below:

[0016] Preferably, a first stop portion projects outwardly from the outer circumferential surface in the radial direction, and the first stop portion is arranged between the front side and the support section. The first stop portion has an outer diameter at least partially greater than the inner diameter of the support body. As a result, the support body can be prevented from slipping off the support section in the direction of the front side. In addition, the clamping body is configured such that the support body can be moved along the movement axis via the rear side to the support section.

[0017] Preferably, a second stop, especially adjacent to the front side, protrudes from the first inner surface in the direction of the second inner surface. The second stop is designed so that when the toothed belt and the pressure plate are accommodated in the accommodation space, the pressure plate is prevented from sliding out in the axial direction along the movement axis.

[0018] Preferably, the toothed belt shaft has a tensioning screw, wherein the clamping body furthermore has a through-hole extending from the front side to the rear side for accommodating the tensioning screw, and the slide furthermore has a tensioning thread which extends from the first receiving opening along the axis of movement, wherein the tensioning screw can be screwed into the tensioning thread in order to adjust the tension of the toothed belt. Furthermore, when maintenance work is performed on the toothed belt shaft during operation, the toothed belt tension can be kept within a desired range by manipulating the tensioning screw. Preferably, the tensioning screw and the tensioning thread are designed such that the toothed belt tension is increased by screwing the tensioning screw into the tensioning thread and the toothed belt tension is reduced by screwing the tensioning screw out of the tensioning thread.

[0019] Preferably, the through-opening has an in particular cylindrical depression in which the head of the tensioning screw can be accommodated, whereby it can be avoided that elements which involve a risk of injury and / or a risk of damage protrude from the front side.

[0020] Preferably, the first receiving opening has a guide profile, and the clamping body has a guide section complementary to the guide profile. For example, it is provided that the receiving opening has a non-circular profile in a cross-sectional plane oriented transversely to the movement axis, and the clamping body has a corresponding profile at least in sections. This enables a presetting of the spatial orientation between the slide and the clamping body and, with this, a rotational protection for the toothed belt accommodated at the clamping body. For example, the mutually corresponding profiles can be designed as planes.

[0021] Preferably, the clamping body is constructed from light metal, in particular aluminum. In this way, the masses that move during operation can be reduced, thereby reducing the energy requirement. In addition, the manufacturing costs can be reduced in this way. The strength loss associated with the use of light metal, in particular aluminum, compared to the use of stainless steel can be compensated by the support body, with which the loads described above are absorbed.

[0022] Alternatively, the holding body can also be constructed from plastic, wherein the above-mentioned statements regarding light metals apply analogously.

[0023] Preferably, the support section has a larger outer diameter than the remaining outer circumferential surface of the clamping body. This makes it easier to apply the support body to the support section, thereby improving the operability. In addition, this prevents that, in addition to the fit provided with respect to the support section, such a fit also has to be provided with respect to the outer circumferential surface extending to the support section, thereby reducing the manufacturing costs.

[0024] Preferably, the outer diameter of the support section is the same as the inner diameter of the support body. In this way, the expansion of the accommodation space can be further prevented, thereby improving the operational safety. Further preferably, a fit is provided between the support section and the support body. The fit is further preferably a transition fit, so as to achieve low-resistance push-up and at the same time minimize the gap between the support body and the support section.

[0025] Preferably, the holding body is at least partially rotationally symmetrically configured. In this way, cost-effective manufacturing methods, such as turning methods, can be used, thereby reducing manufacturing costs.

[0026] Preferably, the toothed belt shaft also has an additional clamping device, wherein the slide also has an additional end face, into which a second receiving opening arranged opposite to the first receiving opening is introduced for receiving the additional clamping device, wherein the toothed belt has an additional end region, which is received in the receiving space of the additional clamping device.

[0027] The toothed belt can be clamped and preferably tensioned as follows: First, the end region of the toothed belt is inserted into the receiving space of the clamping body. Then, a corresponding pressure plate is inserted into the receiving space, preferably via the opening of the groove present at the outer circumferential surface. Alternatively, the pressure plate can be inserted into the receiving space first and then the end region of the toothed belt. Subsequently, the support body is applied to the support section. The pressure plate is then pressed against the toothed belt by means of a pressure element resting on the underside of the pressure plate, whereby the outer side of the toothed belt is pressed against the second inner surface. The clamping device is then introduced into the receiving opening, i.e. inserted into the receiving opening and fastened in the receiving opening, preferably by means of a tensioning screw. Finally, the tensioning of the toothed belt can be adjusted by screwing the tensioning screw into or out of the tensioning thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] An advantageous embodiment of the invention is shown in the drawings.

[0029] Figure 1 A toothed belt shaft according to the invention is shown,

[0030] Figure 2 Shown in Figure 1 The profile body and slide block of the toothed belt shaft shown in

[0031] Figure 3 shows an abstract cross-sectional view of a toothed belt shaft according to the invention,

[0032] Figure 4 The exploded view shows the Figure 2 The slider shown in Figure 1 The clamping device for the toothed belt shaft shown in

[0033] Figure 5 shows an abstract schematic diagram of a clamping device having a support body surrounding a support section,

[0034] Figure 6 Shown in Figure 5 The clamping device shown in FIG. 1 has a support body arranged next to the clamping body. DETAILED DESCRIPTION

[0035] Figure 1 The toothed belt shaft 200 according to the invention is shown, which has a slide 300 and a profile body 230. The profile body 230 is oriented along a movement axis 500 and is designed to linearly guide the slide 300 along the movement axis 500. Figure 1 The toothed belt 210 (see Figure 3 ) is driven. Here, the toothed belt 210 is driven by Figure 1 The toothed belt pulley 220 (see Figure 3 ) is driven, and the toothed belt pulley is accommodated in a deflection housing 232 installed at the end side of the profile body 230. The toothed belt pulley 220 is connected to the profile body 230. Figure 1 The motor flange 250 (see Figure 3 ) connection, at which, for example, an electric motor for driving the toothed belt pulley 220 can be provided. In this case, the toothed belt pulley 220 rotates around the first rotation axis 510. On the side of the profile body 230 opposite to the toothed belt pulley 220, a deflection housing 234 arranged at the end of the profile body 230 is provided. Figure 1 The deflection element 240 (see Figure 3), the toothed belt 210 is deflected by means of the deflection element. Here, the deflection element 240 rotates around the second rotation axis 520. Figure 1 The profile body 230 shown in FIG. 2 preferably has a cover in order to protect the toothed belt 210 from dirt and damage.

[0036] Figure 2 Shown in Figure 1 2 and 3. The profile body 230 and the slide 300 of the toothed belt shaft 200 are shown in FIG. The profile body 230 is preferably designed with a constant profile along the axis of movement 500, in particular as an aluminum extruded profile.

[0037] The slide 300 has a cuboid carrier body 302, the upper side 304 of which can be used to accommodate a workpiece or a workpiece carrier (not shown). From the lower side 305 facing away from the upper side 304, a coupling body 307 extends, with which the slide 300 extends into the recess 236 defined by the profile body 230. Below the upper edge of the profile body 230 (which is at the top in the illustration), at the coupling body 307, a first receiving opening 312 extending along the movement axis 500 is introduced into the first end face 310 of the coupling body 307, which is oriented purely by way of example in the axial direction. This first receiving opening 312 is used to accommodate the clamping device 100, as described in detail below.

[0038] Figure 3 An abstract cross-sectional view of a toothed belt shaft 200 according to the present invention is shown. Figure 1 and Figure 2 Starting from the diagram, Figure 3 As can be seen in the figure, the slide 300 with the carrier body 302 is arranged at least partially outside the profile body 230, which is only shown in dashed lines, while the coupling body 307 is accommodated in a recess 236 of the profile body 230. The toothed belt pulley 220 and the deflection element 240 (which can also be configured as a toothed belt pulley) are each supported in a deflection housing 232, 234 respectively arranged at the end side of the profile body 230 in a manner that can rotate around the first rotation axis 510 or the second rotation axis 520.

[0039] The toothed belt pulley 220 and the deflection element 240 are each partially surrounded by a toothed belt 210, which extends from the first clamping device 100 to the further clamping device 100. For the following description, it is assumed that the first clamping device 100 and the further clamping device 100 are of identical design, so that a separate description of the further clamping device 100 is omitted.

[0040] The two clamping devices 100 are respectively introduced into the mutually opposite receiving openings of the coupling body 307 (at Figure 3 Not shown in detail, see Figure 2 and Figure 4 )middle.

[0041] The toothed belt 210 has two end regions 216, of which a respective one of the end regions 216 is clamped in one of the two clamping devices 100. Figure 3 The toothed belt 210 shown in FIG. 1 has a lower run 218 in the lower region, which is located between the toothed belt pulley 220 and the deflection element 240, and two upper run sections 219 in the upper region, which are located between the toothed belt pulley 220 and the left clamping device 100 on the one hand and between the deflection element 240 and the right clamping device 100 on the other hand. The two upper run sections 219 and the lower run section 218 are oriented along the movement axis 500.

[0042] The slider 300 can be moved to the right along the movement axis 500 by means of the toothed belt 210. For this purpose, the toothed belt pulley 220 is driven in the clockwise direction. In addition, the slider 300 can be moved to the left along the movement axis 500 by means of the toothed belt 210. For this purpose, the toothed belt pulley 220 is driven in the counterclockwise direction.

[0043] Figure 4 The exploded view shows the Figure 2 The slider 300 shown in FIG. Figure 1 The clamping device 100 of the toothed belt shaft 200 is shown in FIG.

[0044] A first receiving opening 312 extending along the movement axis 500 is introduced into the first end face 310. Starting from the first end face 310, the first receiving opening 312 has a circular and upwardly open first section, a second end face 311 and a second section with a guide contour 324 in sequence along the movement axis 500. The first section has a larger inner diameter than the second section. In addition, the inner diameter of the first section is larger than the outer diameter D5 (see FIG. 2 ) of the support body 140, which is not shown here. Figure 6 ), so that the support body 140 can be accommodated in the first section. In addition, the outer diameter D5 of the support body 140 is greater than the inner diameter of the second section, so that the support body 140 can be supported at the second end surface 311 without intruding into the second section. This support only occurs when the support body 140 slips off the clamping body 110 described in detail below in an undesirable manner.

[0045] Furthermore, the sliding block 300 has a further end face (at Figure 4 ) and a second receiving opening 314 introduced into the other end face (not shown in FIG. Figure 4 For the following description it is assumed that the first receiving opening 312 and the second receiving opening 314 are designed identically, so that a separate description of the second receiving opening 314 is omitted.

[0046] The clamping device 100 has a substantially rotationally symmetrical clamping body 110 with a cylindrical outer circumferential surface 119. In addition, the clamping body 110 has a front side 112, a rear side 115, a groove extending from the front side 112 and extending transversely to the axis of rotational symmetry (which is at the rear side). Figure 4 The receiving space 120 extends in the center (orientated coaxially with the movement axis 500 ) and the supporting section 129 is designed to be cylindrical.

[0047] Furthermore, the clamping device 100 has a pressure plate 130, a support body 140 of annular design and a pressure element 150. In the operating state, the support body 140 surrounds the support section 129 and is therefore in a functional position (see Figure 5 ).

[0048] The accommodation space 120 extends from the front side 112 along the movement axis 500 and penetrates the clamping body 110 perpendicularly to the movement axis 500 . The accommodation space 120 has a first inner surface 123 and a second inner surface 124 opposite to the first inner surface 123 .

[0049] The pressure plate 130 has a pressure plate upper side 132 with a toothing (not shown in detail) and a pressure plate lower side 134, wherein the toothed belt 210 (see Figure 3 and Figure 5 ) also has a toothed belt inner side 212 with a toothing which is likewise not shown in detail (see Figure 5 ) and the outer side 214 of the toothed belt (see Figure 5 ). The toothing of the pressure plate upper side 132 is designed to be complementary to the toothing of the toothed belt inner side 212 .

[0050] A first stop 113 of annular configuration projects outwardly in radial direction from an outer circumferential surface 119 of the clamping body 110 , which is arranged between the front side 112 and the supporting section 129 .

[0051] A second stop 128, in particular adjacent to the front side 112, projects from the first inner surface 123 in the direction of the second inner surface 124. The second stop 128 is designed such that the end region 216 received in the receiving space 120 in combination with the pressure plate 130 is secured against slipping out in the direction of the front side 112 along the movement axis 500.

[0052] The pressure element 150 is designed as a threaded pin.

[0053] Furthermore, a tensioning screw 400 is provided, which can be received in the through hole 127 of the clamping body 110 and can be screwed into the tensioning thread (at Figure 4210) in order to adjust the tension of the toothed belt 210. In addition, the clamping body 110 has a guide area 117 which is designed purely as a plane and is designed complementary to the guide contour 324 of the first receiving opening 312. When the clamping device 100 is received in the first receiving opening 312, the plane of the guide area 117 is oriented so that the surface normal of the plane extends transversely to the movement axis 500. Figure 4 302, purely by way of example, the plane of the guide region 117 is also oriented parallel to the upper side 304 of the carrier body 302. The remarks on the orientation of the plane of the guide region 117 apply analogously to the orientation of the guide contour 324. Furthermore, the guide region 117 and the guide contour 324 can also be designed in a serrated or curved manner. Thus, a clear rotational orientation of the clamping body 110 relative to the first receiving opening 312 and thus relative to the slide 300 is ensured by the form fit between the clamping body 110 and the first receiving opening 312. Furthermore, a rotational lock is thereby ensured for the end region 216 of the toothed belt 130 received at the clamping body 110.

[0054] Figure 5 1 shows an abstract schematic diagram of a clamping device 100 having a support body 140 surrounding a support section 129. The support body 140 is thus in a functional position. Figure 5 In the configuration shown in FIG. 1 , the pressure plate 130 and the end region 216 are received in the receiving space 120 in such a way that the toothed belt outer side 214 faces the second inner surface 124, the pressure plate underside 134 faces the first inner surface 123, and the toothed belt inner side 212 faces the pressure plate upper side 132. The pressure plate 130 is pressed against the toothed belt 210 by means of the pressure element 150 resting against the pressure plate underside 134, thereby pressing the toothed belt outer side 214 against the second inner surface 124. In this case, the support body 140 surrounding the support section 129 prevents an expansion of the receiving space 120, in particular caused by the pressure element 150. The rear side 115 has a chamfer, thereby simplifying the application of the support body 140 to the clamping body 110 and the introduction of the clamping device 100 into the first receiving opening 312.

[0055] Figure 6 Shown in Figure 5 1 , the clamping device 100 shown in FIG. 1 has a support body 140 arranged next to the clamping body 110. The support body 140 has an inner diameter D3 that is as large as the outer circumference D1 of the support section 129. The outer circumferential surface 119 has an outer diameter D2 that is smaller than the inner diameter D3 and the outer diameter D1. The first stopper 113 has an outer diameter D4 that is larger than the inner diameter D3. In this way, the support body 140 can be prevented from sliding down in the direction of the front side 112 along the movement axis 500.

Claims

1. A toothed belt shaft (200), comprising a toothed belt (210), a toothed belt pulley (220), a steering element (240), a profile body (230) extending along a movement axis (500), a slider (300) and a clamping device (100), wherein: The slider (300) has a first end face (310), into which a first receiving opening (312) extending along the movement axis (500) for receiving the clamping device (100) is introduced, wherein the profile body (230) is configured to linearly movably guide the slider (300), wherein the toothed belt (210) can be driven by means of the toothed belt pulley (220) and can be steered by means of the steering element (240), wherein the slider (300) can be moved in the profile body (230) by means of the toothed belt (210), and wherein the clamping device (100) is The holding device (100) comprises a clamping body (110), a pressure plate (130), a support body (140) of an annular structure and a pressure element (150), wherein the clamping body (110) comprises a front side (112), a rear side (115), a receiving space (120) configured as a groove and a support section (129), wherein the receiving space (120) extends from the front side (112) along the movement axis (500) and passes through the clamping body (110) transversely to the movement axis (500), wherein the receiving space (120) comprises a first inner surface (123) and a support section (129) connected to the first inner surface. 123), wherein the pressure plate (130) has a pressure plate upper side (132) with teeth and a pressure plate lower side (134), wherein the toothed belt (210) has a toothed belt inner side (212) with teeth, a toothed belt outer side (214) and at least one end region (216), wherein the pressure plate (130) and the end region (216) are accommodated in the accommodation space (120) such that the toothed belt outer side (214) faces the second inner surface (124), the pressure plate lower side (134) faces the first inner surface (123) and The inner side (212) of the toothed belt faces the upper side (132) of the pressure plate, wherein the toothing of the upper side (132) of the pressure plate is constructed complementary to the toothing of the inner side (212) of the toothed belt, wherein the pressure plate (130) is pressed against the toothed belt (210) by means of a pressure element (150) abutting against the lower side (134) of the pressure plate so as to press the outer side (214) of the toothed belt against the second inner surface (124), wherein the support body (140) surrounds the support section (129) so as to prevent expansion of the accommodating space (120), in particular caused by the pressure element (150).

2. The toothed belt shaft (200) according to claim 1, characterized in that: The clamping body (110) has an outer circumferential surface (119), from which a first stop portion (113) protrudes outward in a radial direction, and the first stop portion is arranged between the front side (112) and the supporting section (129).

3. The toothed belt shaft (200) according to claim 1 or 2, characterized in that: A second stop (128), in particular adjacent to the front side (112), projects from the first inner surface (123) in the direction of the second inner surface (124).

4. The toothed belt shaft (200) according to any one of the preceding claims, characterized in that The toothed belt shaft (200) further has a tensioning screw (400), wherein the clamping body (110) further has a through hole (127) extending from the front side (112) to the rear side (115) for accommodating the tensioning screw (400), and the slider (300) further has a tensioning thread, which extends from the first accommodating opening (312) along the movement axis (500), wherein the tensioning screw (400) can be screwed into the tensioning thread in order to adjust the tension of the toothed belt (210).

5. The toothed belt shaft (200) according to any one of the preceding claims, characterized in that The first receiving opening (312) has a guide contour (324), and the clamping body (110) has a guide area (117) that is complementary to the guide contour (324).

6. The toothed belt shaft (200) according to any one of the preceding claims, characterized in that The holding body (110) is made of light metal, in particular aluminum.

7. The toothed belt shaft (200) according to any one of the preceding claims, characterized in that The supporting section (129) has a larger outer diameter than the remaining outer circumferential surface (119).

8. The toothed belt shaft (200) according to any one of the preceding claims, characterized in that The outer diameter of the support section (129) is as large as the inner diameter of the support body (140).

9. The toothed belt shaft (200) according to any one of the preceding claims, characterized in that The holding body (110) is designed at least in regions to be rotationally symmetrical.

10. The toothed belt shaft (200) according to any one of the preceding claims, characterized in that The toothed belt shaft (200) further has an additional clamping device (100), wherein the slider (300) further has an additional end face, into which a second receiving opening (314) arranged opposite to the first receiving opening (312) is introduced for receiving the additional clamping device (100), wherein the toothed belt (210) has an additional end region (216) which is received in a receiving space (120) of the additional clamping device (100).

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