Guide device for a wrapping element of a conical disc wrapping gear
The guide device with a double-T beam design addresses stability and vibration damping issues in conical disc wrapping drives by enhancing structural integrity and reducing noise and wear, ensuring efficient operation without additional space.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- SCHAEFFLER TECHNOLOGIES AG & CO KG
- Filing Date
- 2012-08-03
- Publication Date
- 2026-05-21
AI Technical Summary
Existing guide devices for conical disc wrapping drives face challenges in maintaining stability and damping vibrations while minimizing noise and wear, particularly due to temperature fluctuations and vibrations in the transverse direction.
A guide device with a double-T beam design featuring a first and second guide section connected by a reinforcing rib structure, including a longitudinal rib and transverse ribs, which enhances stability, damping, and reduces noise by guiding the wrapping element with minimal play and without additional installation space.
The guide device increases stability and damping of vibrations, reduces noise, and minimizes wear, while maintaining efficient operation without requiring extra space, through its enhanced structural integrity and vibration damping capabilities.
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Abstract
Description
[0001] The invention relates to a guide device for a wrapping element of a conical disc wrapping drive comprising a first guide section and a second guide section spaced apart from the first guide section, between which the wrapping element can be guided in a running direction, wherein the guide sections have a longitudinal direction corresponding to the running direction of the wrapping element and a transverse direction perpendicular thereto and lateral edge sections limiting the guide sections in the transverse direction.
[0002] From WO 2007 / 068229 A1, a guide arrangement for a wrapping element with at least one guide device is known, comprising at least two corresponding guide tongues between which the wrapping element is at least partially guided, wherein the guide tongues are held at a predetermined distance from each other by means of a connecting area, in which, in the event of temperature changes, the distance between the guide tongues is approximately constant by using materials with different coefficients of thermal expansion in the guide device, in order to keep the distance between the guide tongues approximately constant regardless of temperature fluctuations.According to WO 2007 / 068229 A1, the material of the guide device is essentially a plastic with a high coefficient of thermal expansion, and at least the connection area of the guide device includes at least one element made of a material with a lower coefficient of thermal expansion, such as a U-shaped metal bracket.
[0003] From patent application JP 2009-85 397 A, a continuously adjustable conical disc wrapping drive with a guide device is known, comprising a first guide section and a second guide section spaced apart from it, between which the wrapping element can be guided in one direction of travel. One guide section has a longitudinally extending longitudinal rib, which is spaced apart from edge sections.
[0004] The invention is based on the objective of improving a guide device mentioned above in terms of its structure and / or function.
[0005] The problem is solved by the features of claim 1. The dependent claims specify advantageous further developments of the invention.
[0006] The transmission ratio of a conical disc drive can be continuously variable. The conical disc drive can be a continuously variable transmission (CVT). The conical disc drive can be a variator transmission. The conical disc drive can be integrated into the drivetrain of a motor vehicle. The conical disc drive can have a first pair of conical discs and a second pair of conical discs. The pairs of conical discs can have parallel axes of rotation. Each pair of conical discs can have one axially fixed disc and one axially displaceable disc. The axially displaceable discs of the pairs can rotate in opposite directions. The first pair of conical discs can be driven by a drive unit. The drive unit can be an internal combustion engine. An output can be connected to the second pair of conical discs.The wrapping mechanism can serve to transmit mechanical power between the first and second pairs of conical discs. The conical disc wrapping mechanism can have a housing. The conical discs can be mounted within the housing.
[0007] The wrapping element can be a traction element. The wrapping element can be a chain. The chain can be a link chain. The chain can have links and pressure pieces. The pressure pieces can serve to couple the wrapping element to the conical disc pairs. Coupling between the pressure pieces and the conical disc pairs can be friction-fit. The links can serve to couple the pressure pieces. The wrapping element can have a load-bearing side and a slack side. During operation, vibrations in the transverse direction can be excited in the load-bearing side and / or in the slack side of the wrapping element. A transverse direction can be a direction perpendicular to the direction of travel of the wrapping element and to the axes of rotation of the conical disc pairs. The wrapping element can assume a running position depending on the gear ratio of the conical disc wrapping mechanism.The running position of the wrapping element can change with a change in the gear ratio of the conical disc wrapping mechanism.
[0008] The guiding device allows the wrapping element to be guided on a loaded tower. The guiding device allows the wrapping element to be guided on an empty tower. The wrapping element can be guided in a transverse direction against the first and second guide sections. The wrapping element can be guided with at least approximately zero play between the first and second guide sections. The wrapping element can slide on the first and / or second guide sections during operation. The inner side of the wrapping element can be guided on the first guide section. An inner side of the wrapping element can be a side facing the axes of rotation of the conical disc pairs. The outer side of the wrapping element can be guided on the second guide section.An outer side of the wrapping means can be a side facing away from the axes of rotation of the conical disk pairs.
[0009] The first guide section and the second guide section can be connected to each other by means of a connecting section. The connecting section can be arranged at a lateral edge section of the first guide section and at a lateral edge section of the second guide section. The lateral edge sections can define the guide sections in the transverse direction. The first guide section, the second guide section, and the connecting section can be manufactured in one piece. The connecting section can have reinforcing ribs. The connecting section can have an upper, a lower, and lateral edge sections. The reinforcing ribs can be arranged at least at one edge section of the connecting section. Reinforcing ribs can also be arranged between the edge sections of the connecting section.Diagonally running reinforcing ribs can be arranged between the edge sections of the connecting section. A ring-shaped reinforcing rib can be arranged between the edge sections of the connecting section.
[0010] The longitudinal rib can be arranged transversely on the inside. A transverse direction can be a direction corresponding to the axes of rotation of the conical disk pairs. The longitudinal rib can be arranged transversely at least approximately centrally between the edge sections. The longitudinal rib can be arranged transversely off-center. The guide device can be divided longitudinally into two guide device halves. The guide device halves can be connected to each other. The guide device halves can be positively connected to each other. The guide device halves can be interlocked. A guide section can be divided longitudinally into two guide section halves. Each guide section half can have transversely bounding edge sections. Each guide section half can have a longitudinal rib.The longitudinal rib of each guide section half can be spaced apart from the edge sections of that guide section half. The longitudinal rib of each guide section half can be arranged transversely on the inside of the guide section half. The longitudinal rib of each guide section half can be arranged transversely at least approximately centered between the edge sections of the guide section half. The longitudinal rib of each guide section half can be arranged transversely off-center between the edge sections of the guide section half.
[0011] The guide device according to the invention exhibits increased stability. Its area moment of inertia is increased. Its bending stiffness is increased. Its form stiffness is increased. The guide device according to the invention enables improved damping of vibrations of the wrapping element. Noise generation during operation is reduced. Wear of the wrapping element is reduced. No additional installation space is required.
[0012] The at least one guide section can have a guide tongue and an outer tongue spaced apart from the guide tongue, and the longitudinal rib can extend between the guide tongue and the outer tongue. The guide tongue and the outer tongue can be spaced apart from each other in a vertical direction of the guide device. A vertical direction can be perpendicular to the direction of travel of the wrapping element and to the axes of rotation of the conical disk pairs. A vertical direction can also correspond to a transverse direction. The wrapping element can be guided in a sliding position against the guide tongue. The guide tongue and the outer tongue can be arranged at least approximately parallel to each other. The guide tongue and the outer tongue can be spaced further apart from each other in a central section of the guide section than at the end sections of the guide section.The guide tongue and the outer tongue can merge into each other at the end sections of the guide section. The longitudinal rib can extend between the guide tongue and the outer tongue in the vertical direction of the guide section. The guide tongue, the outer tongue, and the longitudinal rib can form a double-T profile-like cross-section of the at least one guide section. This results in the at least one guide section exhibiting a high area moment of inertia.
[0013] The at least one guide section can have at least one transverse rib. The transverse rib can extend in the transverse direction of the guide section. The transverse rib can extend in the vertical direction of the guide section. This further increases stability. Several transverse ribs can be arranged along the at least one guide section. Several transverse ribs can be distributed along the longitudinal direction of the guide section. The transverse ribs can be arranged at least approximately equal intervals from each other. The transverse ribs can be distributed at least approximately symmetrically. This ensures adapted stability along the length of the guide section.
[0014] The guide tongue, outer tongue, longitudinal rib, and / or transverse rib(s) can have at least approximately the same material thickness. This improves manufacturability, for example, in an injection molding process. The guide element can be made from a single technological material. The material can be sheet metal. The material can be plastic. The plastic can contain a filler. A hybrid design can be avoided.
[0015] In summary, and in other words, the invention provides, among other things, a torsionally rigid sliding rail in a double-T beam design.
[0016] Chain vibrations in the area between the pulley sets (tension side, slack side) can be prevented from oscillating by the guide rails, thus minimizing noise. The stiffness of the guide rail tongues can be a factor in this. Due to the available installation space, both on the inside due to the pulley geometry and on the outside due to the housing, the shape of the tongues can be severely restricted.
[0017] Bending stiffness / form stiffness can be derived from the modulus of elasticity (E) and the area moment of inertia (I). An increase in bending stiffness can be achieved with an I-beam, possibly supported by additional transverse ribs perpendicular to the longitudinal ribs and the inner sliding rail tongue. This geometric measure can, for example, eliminate the need for additional elements such as metal leaf springs.
[0018] The guide rail can have an I-profile (double-T beam). The longitudinal rib can be arranged towards the center of the tongue. Additionally, a tongue corresponding to the contour of the outer guide rail tongue / sliding surface can be provided, according to the maximum available outer contour. Transverse ribs can be attached to both sides of the longitudinal rib, connected to both the first and second outer ribs, and counteract twisting.
[0019] An embodiment of the invention is described in more detail below with reference to the figures. Further features and advantages will become apparent from this description. Specific features of this embodiment may represent general features of the invention. Features of this embodiment combined with other features may also represent individual features of the invention.
[0020] They show schematically and by example: Fig. 1 a continuously adjustable gearbox with two pairs of conical pulleys, a chain and a guide rail for guiding the chain, Fig. 2 One half of a two-part slide rail with two guide sections and a connecting section, viewed from the inside. Fig. 3 One half of a two-part slide rail with two guide sections and one connecting section, viewed from the outside. Fig. 4 one slide rail half of a two-part slide rail with two guide sections and one connecting section in cross-sectional view and Fig. 5 One half of a two-part slide rail with two guide sections and a connecting section in longitudinal section view.
[0021] Fig. Figure 1 shows a continuously adjustable gearbox 100 with two pairs of conical discs 102, 104, a chain 106 and a guide rail 108 for guiding the chain 106.
[0022] The conical disc pair 102 can be driven by a motor vehicle's internal combustion engine. One axis of rotation of the conical disc pair 102 is designated 110. The arrow a indicates a drive direction. The conical disc pair 104 can be driven by the motor vehicle's drive wheels. One axis of rotation of the conical disc pair 104 is designated 112.
[0023] The chain 106 serves to transmit mechanical power between the conical disc pair 102 and the conical disc pair 104. In the figure, the chain 106 runs on a small radius on the conical disc pair 102 and on a large radius on the conical disc pair 104. This results in a reduction in speed.
[0024] The conical discs of the conical disc pairs 102, 104 are each displaceable relative to each other in the direction of the axes of rotation 110, 112. When the conical discs of a conical disc pair 102, 104 are far apart, the chain 106 runs on a small radius. When the conical discs of a conical disc pair 102, 104 are close together, the chain 106 runs on a large radius. If the distance between the conical discs is increased, the running radius of the chain 106 shifts towards smaller radii. If the distance between the conical discs is decreased, the running radius of the chain 106 shifts towards larger radii. The conical discs of the conical disc pairs 102, 104 are adjusted in opposite directions so that the chain 106 remains under tension. When the gear ratio of the transmission 100 is changed, the relative position between the chain 106 and the axles 110, 112 of the conical disc pairs 102, 104 changes.
[0025] With a drive direction corresponding to arrow a, the chain 106 runs in the direction of arrow b. The guide rail 108 is then arranged on one load-bearing leg of the chain 106. The guide rail 108 has an inner guide section 114 and an outer guide section 116. The guide sections 114 and 116 are connected to each other by means of connecting sections, such as 118. The chain 106 is guided between the guide sections 114 and 116 with only minimal play. The guide rail 108 is arranged on a support tube 120. The support tube 120 is fixed to a housing of the gearbox 100 and thus fixed with respect to the axes 110 and 112 of the conical pulley pairs 102 and 104. The guide rail 108 has an elongated slot for mounting on the support tube 120. During operation of the gearbox 100, vibrations can be excited in the chain 106 in a transverse direction c. The elongated slot of the slide rail 108 extends in the direction of arrow c.To allow the position of the chain 106 to change when the gear ratio of the transmission 100 is changed, the slide rail 108 is rotatably mounted on the support tube 120 about a longitudinal axis of the support tube 120 and is displaceable in the direction of arrow c. The slide rail 108 is composed of two slide rail halves. The two slide rail halves are joined in the direction of the axes of rotation 110, 112. A dividing plane of the slide rail 108 extends in the direction of travel b of the chain 106 and in the transverse direction c.
[0026] Fig. Figure 2 shows one half of a slide rail 200 of a two-part slide rail, such as slide rail 108 according to Fig. Figure 1, with two guide sections 202 and 204 and a connecting section 206, shown from the inside. The guide sections 202 and 204 are spaced apart from each other by means of the connecting section 206. The connecting section 206 is narrower at its end corresponding to the guide section 202 than at its end corresponding to the guide section 204. The inner surface of the connecting section 206 forms a lateral guide for a chain.
[0027] The guide section 202 serves to guide a chain, such as chain 106 according to Fig. 1, from the inside. The guide section 204 serves to guide the chain from the outside. The guide section 202 has a sliding tongue 208. The guide section 202 has a receptacle 210 for connection to a retaining tube, such as retaining tube 120 according to Fig. 1. The guide section 204 has a sliding tongue 212. The sliding tongue 208 of the guide section 202 and the sliding tongue 212 of the guide section 204 are arranged parallel to each other. The guide section 202 has an outer tongue 214. The outer tongue 214 and the sliding tongue 208 are spaced apart from each other. In a central section, the outer tongue 214 is spaced further away from the sliding tongue 208 than at the end sections of the guide section 202. At the end sections, the outer tongue 214 and the sliding tongue 208 merge into each other. Otherwise, the outer tongue 214 and the sliding tongue 208 are arranged parallel to each other.
[0028] A longitudinal rib 216 is arranged between the sliding tongue 208 and the outer tongue 214. The longitudinal rib 216 extends between the end sections along the sliding tongue 208 and the outer tongue 214. The longitudinal rib 216 is arranged at right angles to the sliding tongue 208 and the outer tongue 214. Transverse to the longitudinal rib 216, the guide section 202 has transverse ribs, such as 218, 220, and 222. The transverse ribs 218, 220, and 222 are arranged between the sliding tongue 208 and the outer tongue 214.
[0029] The slide rail half 200 has a dowel pin 224, a dowel pin receptacle 226, a locking hook 228, and a locking bracket 230 for connection to a second slide rail half. The slide rail half 200 is manufactured in one piece. The slide rail half 200 is made of a plastic, for example, a polyamide, optionally with a glass fiber filling. The slide rail half 200 is manufactured using an injection molding process.
[0030] Fig. Figure 3 shows one half of a slide rail 300 of a two-part slide rail, such as slide rail 108 according to Fig. 1, with two guide sections 302, 304 and a connecting section 306 in view from the outside. On the outside, the connecting section 306 has ribs 308, 310, 312, 314 running along its edge sections, as well as diagonally running ribs, such as 316, 318, and an annular rib 320. Furthermore, Fig. 2 and the associated description are referenced.
[0031] Fig. Figure 4 shows one half of a slide rail 400 of a two-part slide rail, such as slide rail 108 according to Fig. Figure 1 shows a cross-sectional view of a guide section 404 with two guide sections 402 and 404 and a connecting section 406. The sliding tongue 408 of the guide section 404 has edge sections 410 and 412 that define the sliding tongue 408 in the transverse direction. The outer tongue 414 of the guide section 404 has edge sections 416 and 418 that define the outer tongue 414 in the transverse direction. The longitudinal rib 420 is arranged internally between the edge sections 410, 412, 416, and 418 in the transverse direction. The connecting section 406 connects the edge section 410 of the guide section 404 and the guide section 402. A transverse rib 422 is visible in the figure. The transverse rib 422 extends between the edge sections 410, 416 and the edge sections 412, 418. Furthermore, the following applies: Fig. 2 and Fig. 3 and the associated description are referenced.
[0032] Fig. Figure 5 shows one half of a slide rail 500 of a two-part slide rail, such as slide rail 108 according to Fig. 1, with two guide sections and a connecting section 502 in longitudinal section view. A sliding tongue 504 of a guide section 506 is visible in the figure. The section line runs through the longitudinal rib 508 and the transverse ribs, such as 510, 512, 514. Further details are provided below. Fig. 2, Fig. 3 and Fig. 4 and the associated description are referenced. Reference symbol list 100 gearboxes 102 pairs of conical discs 104 pairs of conical discs 106 chain 108 Sliding rail 110 Rotary axis 112 Rotary axis 114 Leadership section 116 Leadership section 118 Connecting section 120 retaining tube 200 slide rail half 202 Management section 204 Management section 206 Connecting section 208 Gliding tongue 210 recording 212 Gliding tongue 214 Outer tongue 216 Longitudinal rib 218 transverse rib 220 transverse rib 222 transverse rib 224 Dowel pin 226 locking hooks 228 locking levers 300 slide rail half 302 Guide Section 304 Guide section 306 Connecting section 308 rib 310 rib 312 rib 314 rib 316 ribs 318 ribs 320 ribs 400 slide rail half 402 Guide section 404 Guide section 406 Connecting section 408 Gliding tongue 410 marginal section 412 marginal section 414 Outer tongue 416 marginal section 418 marginal section 420 longitudinal rib 422 transverse rib 500 slide rail half 502 Connecting section 504 Sliding tongue 506 Guide section 508 Longitudinal rib 510 Querrippe 512 Querrippe 514 Querrippe
Claims
[1] Guide device (108, 200, 300, 400, 500) which has a continuously adjustable conical disc wrapping drive (100) and a wrapping means (106) is arranged, wherein the guide device has a first guide section (114, 202, 302, 402) and a second guide section (116, 204, 304, 404, 506) spaced apart from the first guide section (114, 202, 302, 402), between which the wrapping means (106) can be guided in a direction of travel, wherein the guide sections (114, 116, 202, 204, 302, 304, 402, 404, 506) have a longitudinal direction corresponding to the direction of travel of the wrapping means (106) and a corresponding vertical transverse direction and the guide sections (116, 204, 304, 404, 506) have lateral edge sections (410, 412, 416, 418) limiting the transverse direction, wherein at least one guide section (116, 204, 304, 404, 506) has at least one longitudinally extending longitudinal rib (216, 420, 508),which is spaced apart from the edge sections (410, 412, 416, 418), wherein the at least one guide section (116, 204, 304, 404, 506) has a guide tongue (212, 408, 504) and an outer tongue (214, 414) spaced apart from the guide tongue (212, 408, 504), and the longitudinal rib (216, 420, 508) extends between the guide tongue (212, 408, 504) and the outer tongue (214, 414), wherein the guide tongue (212, 408, 504), the outer tongue (214, 414) and the longitudinal rib (216, 420, 508) form a The at least one guide section (116, 204, 304, 404, 506) forms a double-T profile-like cross-section and has at least one transverse rib (218, 220, 222, 422, 510, 512, 514) and the outer tongue (214, 414). [2] Guide device (108, 200, 300, 400, 500) according to claim 1, characterized by, that several transverse ribs (218, 220, 222, 422, 510, 512, 514) are arranged along at least one guide section (116, 204, 304, 404, 506). [3] Guide device (108, 200, 300, 400, 500) according to any one of the preceding claims, characterized by , that the guide tongue (212, 408, 504), the outer tongue (214, 414), the longitudinal rib (216, 420, 508) and / or the transverse rib (218, 220, 222, 422, 510, 512, 514) have at least approximately the same material thickness. [4] Guide device (108, 200, 300, 400, 500) according to any one of the preceding claims, characterized by , that the guide device (108, 200, 300, 400, 500) is made from a single technological material.