JP2009519410A - Guide device for winding means, and injection molding tool for manufacturing guide device - Google Patents

Abstract

  The present invention is a guide device for winding means, comprising at least one guide member having at least two guide tongues (2, 3) corresponding to each other, the two guide tongues The winding means is at least partially guided in between, in which case the two guide tongues (2, 3) are of the type held by a coupling region at a predetermined distance from each other . According to the present invention, when the temperature changes, the gap (a) between the two guide tongues (2, 3) uses materials having different thermal expansion coefficients as the material of the guide member (1). By doing so, it is kept almost constant. The invention also relates to an injection molding tool having two mutually corresponding injection molding halves (6) for producing a guide member (1) of a guide device for winding means. In this case, according to the invention, at least one element made of a material having a low coefficient of thermal expansion is held in the injection molding tool half (6).

Description

  The present invention is a guide device for winding means, comprising at least one guide member having at least two guide tongues corresponding to each other, and the winding between the two guide tongues The means is at least partly guided, in which case the two guide tongues are of the type held by the coupling region at a predetermined distance from each other. The present invention also relates to an injection molding tool having two mutually corresponding injection molding halves for producing a guide member of a guide device for winding means.

  In the automotive art, guide devices are known for guiding or receiving, for example, winding means for transmissions, in particular conical belt wheel winding transmissions (CVT transmissions). In the conical belt wheel winding transmission device, winding means for transmitting torque between two pairs of belt wheels is used, and in this case, the winding means is, for example, a chain or a belt. In order to meet the desired acoustic requirements, it is necessary to reduce the so-called belt running vibration of the winding means and thereby reduce the noise. For this purpose, a receiving rail is provided as a guide device for partially receiving the winding means. The receiving rail has two tongues that correspond to each other, between which the winding means is guided.

  The size of the chain passage formed between the two corresponding tongues can be changed based on the temperature change. This can cause too much play between the guide surface of the chain passage and the winding means, so that the belt running vibration can no longer be reduced sufficiently. This no longer satisfies the acoustic requirements. Especially at low temperatures, the wrapping means get stuck and do not move (adhere), which results in undesirably high wear.

  Accordingly, an object of the present invention is to improve a guide device of the type described at the beginning so that the distance between the guide tongue pieces is kept almost constant irrespective of the temperature change.

  According to the guide device for the winding means of the present invention that solves this problem, the guide device has at least one guide member having at least two guide tongues corresponding to each other, and the gap between the two guide tongues. The winding means is at least partially guided, in which case the two guide tongues are of the type held by a coupling region at a predetermined distance from each other, according to the invention When the temperature changes, the distance between the two guide tongues is made substantially constant by using materials having different thermal expansion coefficients as the material of the guide member.

  According to this type of guide device of the invention, on the one hand, high wear or sticking at low temperatures is avoided, and on the other hand, undesirable suppression of the vibration of the winding means at high temperatures is prevented. By using materials with different coefficients of thermal expansion, the stretching or compression of one material is each compensated by the other material. Thus, according to the guide device of the present invention, a substantially constant distance between the two guide tongues is guaranteed, so that the winding means is optimally guided regardless of the temperature change. The possible vibrations are reduced to the extent that high acoustic requirements are met by the guide device of the present invention.

  According to an embodiment of the present invention, a plastic having a high thermal expansion coefficient is provided as a material of the guide member, and a coupling region of the guide member is lower than a thermal expansion coefficient of the material of the guide member. At least one element made of a material having For example, the coupling region may be composed in part of a material having a lower coefficient of thermal expansion than the material used for the guide member. The advantages are obtained by the selective combination of different materials in the guide device according to the invention.

  Other combinations of materials are also conceivable to obtain the effect. However, in an advantageous manner, the guide tongue and the coupling region may be made of a plastic having a relatively high coefficient of thermal expansion. This is because this material has optimal sliding or guiding properties for the winding means. In this connection, for example, high temperature polymer PA46 or the like is used as a pair of materials, and CK75 steel or the like is used as a material having a low coefficient of thermal expansion. However, guide devices made of steel, aluminum or GFK plastic with a foamed friction surface may be used, and the elements or parts used may be made of materials having different coefficients of thermal expansion. It is also conceivable to provide a connection between the guide tongues as a connection region. In this case, the coupling is formed by screws, pins, rivets or other coupling means having a low coefficient of thermal expansion.

  Regardless of the choice of material used, according to a possible embodiment of the invention, the element is at least partly incorporated in the coupling region of the guide member. In this alternative embodiment, the element is embedded in the coupling area, for example when manufacturing the guide member.

  According to another advantageous embodiment of the invention, the element is releasably coupled to the coupling region of the guide member. In this embodiment, the element may be fixed to the guide member after the guide member is manufactured. The fixing is performed in the coupling region of the guide member by, for example, a shape connection (constraint by shape) type coupling, for example, locking. Other fixing possibilities are also conceivable.

  Within the framework of a possible embodiment of the invention, the element is configured as a substantially U-shaped metal bracket. In an advantageous manner, the metal bracket is made, for example, from CK75 steel having a relatively low coefficient of thermal expansion. Other structures of the element are possible. The U-shaped configuration is advantageous when the element is fitted into the web-like coupling area as an insert. In an advantageous manner, the dimensions of the base of the U-shaped metal bracket approximately correspond to the dimensions of the coupling area, so that an optimum compensation of the coefficient of thermal expansion is possible. For optimal coupling to the guide tongue, the legs of the U-shaped metal bracket have a transition area, which according to an embodiment of the invention is embedded in the respective guide tongue in each case. It is. In this way, sufficient rigidity of the guide device is ensured.

  According to an advantageous embodiment of the guide device according to the invention, it has a substantially web-like coupling area for holding the corresponding guide tongue. In this case, the guide tongue piece is used as a guide rail or a slide rail. A guide member having a substantially U-shaped cross section is provided by a web-like coupling region. Other structures are also conceivable.

  In order to obtain an optimal force distribution in the bonding area, the substantially web-shaped bonding area has an oval or elliptical cutout in an advantageous manner. Due to the oval shape of the notches, a good force distribution is obtained in the region of the bonded web and the formation of stress is prevented at large temperature changes. Thus, cracking or other damage in the bonded area is avoided.

  The guide device proposed according to the invention can be used for different winding means. This guide device can be used, for example, in conventional chain drives for CVT transmissions, chains, toothed chain drives and the like.

  The object of the invention is solved by an injection molding tool having two injection mold tool halves that correspond to each other for producing a guide member of a guide device for winding means. According to the invention, at least one element made of a material having a relatively low coefficient of thermal expansion is held in the injection tool half. If the guide member is made of plastic, for example, the element is held in one of two injection molding tool halves for manufacturing the guide member. This ensures that the correct position of the element can be obtained at any time during the injection process. Different types of holders are used for this purpose.

  According to an advantageous embodiment of the invention, the injection molding tool half has at least one magnet for holding the element. In order to properly align the elements during manufacture of the guide member, the injection molding tool half has, for example, positioning pins, which align the elements in the injection molding tool in the desired manner.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is a perspective view showing one possible embodiment of a guide device according to the invention for winding means,
FIG. 2 is a cross-sectional view of a part of a guide device when manufacturing with an injection molding tool
FIG. 3 is an enlarged perspective view of a guide device according to the present invention,
FIG. 4 is an enlarged perspective view of an element incorporated in the guide device.

  FIG. 1 shows a perspective view of one possible embodiment of a guide device according to the invention for a winding means not shown in detail.

  The guide device has a guide member 1 having at least two guide tongues 2 and 3 that correspond to each other, and the winding means is at least partially guided between the guide tongues 2 and 3. Yes. The two guide tongues 2 and 3 are held by a common coupling region 4 with a predetermined distance a. The coupling region 4 is shown in FIG. 1 in a broken or partially sectioned view so that the incorporated element is visible. This is shown circled in FIG. In the embodiment of the present invention, the guide device 1 is composed of a high temperature polymer, that is, polyamide PA46. This material PA46 has a high thermal expansion coefficient.

  According to the present invention, the guide device is manufactured from materials having different thermal expansion coefficients, so that the distance a between the guide tongues 2 and 3 is kept substantially constant even when the temperature changes. It is supposed to be. Thereby, compensation by different thermal expansion of the material is realized by a combination of materials having different thermal expansion coefficients. Thus, with the guide device according to the invention, substantially the same guide characteristics for the winding means can be obtained at different ambient temperatures.

  According to this embodiment, the guide tongues 2, 3 and the coupling region 4 are made of a plastic having a high coefficient of thermal expansion. The coupling region 4 additionally has elements made of a material having a low coefficient of thermal expansion (for example CK75) as shown in FIG. This element is configured as a substantially U-shaped metal bracket 5 and is embedded in a coupling region 4 whose cross section is also configured in a substantially U-shape (see FIG. 2).

  FIG. 2 shows an enlarged cross-sectional view of a part of the guide member 1 at the time of manufacture. In this case, the guide device 1 is arranged in the injection molding tool half 6, and the guide member 1 is manufactured in the injection molding tool half 6. The metal bracket 5 is fixed to the injection molding tool 6 or one of the injection molding tool halves 6 before the guide member 1 is manufactured. For this purpose, a magnet 7 is provided in the injection molding tool half 6 and this magnet 7 holds the U-shaped metal bracket 5 in place before and during the injection process.

  Further, positioning pins 8 and 9 are provided, and these positioning pins 8 and 9 are held in the notches 10 and 11, respectively. The positioning pins 8 and 9 are used for correctly aligning the metal bracket 5 during the injection process when the guide device 1 is manufactured. Next to the positioning pins 8, 9, a counter holder 18 is provided on the injection molding tool half 6. As shown in FIG. 2, the transition between the base 12 of the U-shaped metal bracket 5 and the legs 13 and 14 of the U-shaped metal bracket 5 is shown in FIG. It is comprised as a pushing deformation part for.

  FIG. 3 shows an enlarged partial view of the guide device according to the invention. As shown in FIG. 3, the web-like coupling region 4 has a substantially trapezoidal base surface, and this base surface has an egg-shaped notch 15 at the center. The resulting elliptical shape of the edge region of the notch 15 produces an optimum force distribution in the coupling region 4, so that even a strong temperature change can cause dangerous thermal damage. No stress is generated.

  FIG. 4 shows another embodiment of the metal bracket 5 ′, which is incorporated into the coupling region 4 by, for example, injection molding. In this embodiment, the base 12 of the metal bracket 5 ′ conforms to the shape of the web-like coupling region 4. The U-shaped legs 13, 14 of the metal bracket 5 ′ have widened transition areas 16, 17 which are guide tongues 2, 3 when the guide member 1 is injection molded. Embedded therein, so that overall, the higher rigidity of the metal bracket 5 ′ is obtained and the metal bracket 5 ′ can be optimally inserted into the guide device 1.

FIG. 6 is a perspective view showing one possible embodiment of a guide device according to the invention for winding means. It is sectional drawing of a part of guide apparatus at the time of manufacturing with an injection molding tool. It is the expanded perspective view of the guide apparatus by this invention. It is the expanded perspective view of the element integrated in a guide apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Guide member, 2, 3 Guide tongue piece, 4 Connection area | region, 5, 5'U-shaped metal bracket, 6 Injection molding tool half part, 7 Magnet, 8, 9 Locating pin, 10, 11 12 Base, 13, 14 Leg, 15 oval cutout, 16, 17 transition area, 18 counter holder, a spacing between guide tongues

Claims (19)

A guide device for the wrapping means, comprising at least one guide member having at least two guide tongues corresponding to each other, wherein the wrapping means is at least partially between the two guide tongues In this case, the two guide tongues are in the form of being held by a coupling region at a predetermined distance from each other,
When the temperature changes, the distance (a) between the two guide tongues (2, 3) is substantially constant by using materials having different thermal expansion coefficients as the material of the guide member (1). A guide device for winding means, characterized in that:   As a material of the guide member (1), a plastic having a high thermal expansion coefficient is provided, and at least the coupling region (4) of the guide member (1) is larger than the thermal expansion coefficient of the material of the guide member (1). The guide device according to claim 1, comprising at least one element made of a material having a lower coefficient of thermal expansion.   The guide device according to claim 2, wherein the element is at least partly incorporated in the coupling region of the guide member.   4. A guide device according to claim 3, wherein the element is embedded in the coupling region (4) of the guide member (1).   The guide device according to claim 2, wherein the element is releasably secured to the coupling region (4) of the guide member (1).   The guide device according to claim 5, wherein the element is fixed to the coupling region (4) of the guide member (1) by a shape-connecting coupling.   7. A guide device according to claim 2, wherein the element is configured as a U-shaped metal bracket (5).   8. Guide device according to claim 7, wherein the dimension of the base of the U-shaped metal bracket (5) approximately corresponds to the dimension of the coupling area (4).   The guide device according to claim 7 or 8, wherein the transition regions (16, 17) are integrally formed with the legs (13, 14) of the U-shaped metal bracket (5), respectively.   10. Guide device according to claim 9, wherein each transition region (16, 17) is embedded in a guide tongue (2, 3) arranged corresponding to this transition region.   11. A guide device according to any one of claims 7 to 10, wherein the metal bracket (5) is arranged approximately in the center of the coupling region (4).   The guide device according to any one of claims 2 to 11, wherein steel CK75 is provided as a material of the element.   13. The coupling region (4) according to any one of the preceding claims, wherein the coupling region (4) is substantially web-shaped, in which case the end section is coupled to the guide tongue (2, 3). Guide device.   14. A guide device according to any one of the preceding claims, wherein the coupling region (4) has a substantially ovoid cutout (15).   15. A guide device according to any one of the preceding claims, wherein a high temperature polymer is provided as a material for the guide member (1).   The guide device according to any one of claims 1 to 15, wherein a belt, a chain, a CVT chain, and / or a toothed chain is provided as the winding means. In an injection molding tool having two injection molding tool halves corresponding to each other for producing a guide member of a guide device for winding means,
Injection molding tool for manufacturing a guide member of a guide device, characterized in that at least one element made of a material having a lower coefficient of thermal expansion is held in the injection molding tool half (6).   18. Injection molding tool according to claim 17, wherein the injection molding tool half (6) comprises at least one magnet (7) for holding the element.   19. Injection molding tool according to claim 17 or 18, wherein the injection molding tool half (6) has locating pins (8, 9) for aligning the elements.

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