WO2014139517A1

WO2014139517A1 - Transmission and transmission production method

Info

Publication number: WO2014139517A1
Application number: PCT/DE2014/100086
Authority: WO
Inventors: Franz Burkhard KÖNIG; Raimund Perneder; Berthold WOLFF
Original assignee: Sit Antriebselemente Gmbh
Priority date: 2013-03-15
Filing date: 2014-03-13
Publication date: 2014-09-18
Also published as: DE102013102689B4; DE102013102689A1

Abstract

The invention relates to a transmission (1) comprising: an input disc (2), which can be connected to an input shaft, an output disc (3), which can be connected to an output shaft, an endless drive element (6), which is clamped along the input disc (2) and the output disc (3) such that a rotational movement of the input disc (2) is transferred to the output disc (3) by means of the drive element (6), and a housing, which encloses the input disc (2), the output disc (3) and the drive element (6) and which comprises an input section (4), in which the input disc (2) is rotatably mounted, an output section (5), in which the output disc (3) is rotatably mounted, and an intermediate section (7), which extends in an extension direction from the input section (4) to the output section (5) and which forms a rigid connection between the input section (4) and the output section (5), wherein an upper strand (61) and a lower strand (62) of the drive element (6) run in a pertaining cavity (71) which is enclosed by the intermediate section (7). The invention further relates to a production method for such a transmission.

Description

Title:

Transmission and transmission manufacturing process Description:

The invention relates to a transmission with an endless drive element and a transmission manufacturing method for its production. When motors or gear motors are to be connected to working machines, one often selects an envelope transmission with a flat, V-belt or toothed belt as a drive element for transmitting the mechanical power, with which a rotational movement is transmitted from an input to an output shaft. These drive elements are in particular then

preferred when the input and output shafts are arranged parallel to each other. The same task arises in the

Automation technology, if machines or machine groups

are to be linked together mechanically. If the chaining is to work synchronously, the toothed belt should be mentioned as the first choice as a form-locking drive element. For tasks of this kind are common

different center distances between input shaft and output shaft needed. For the formation of the transmission has a favorable effect that the drive element is available in almost any length sorting. However, the optimal gear arrangement can be found for every connection between engine and work machine. The installation geometry and the

Performance of the drive element are to be calculated. The existing input and output shafts are assigned the assumption of additional forces or opposing forces. The bearings of the shafts must therefore be recalculated and, if necessary, they must be replaced with types with higher load ratings. Furthermore, it is necessary to determine the correct preload force for the drive element, to adjust it during mounting and finally to prove this by means of measurements. To solve these problems and for a given Engine / work machine combination to be able to offer a suitable gearbox as a ready-made solution, offer ready-mounted gearbox, which are pre-assembled in a housing. Such a transmission is proposed in DE 20 2010 015 448 U1. It has an input disk, an output disk and an over these two

Discs stretched endless drive element. Input disk and output disk are arranged axially parallel to each other and housed together with the drive element in a housing. The housing is adapted to receive the above-mentioned additional forces exerted by the drive element. Another advantage is that that

Drive element is securely housed in the housing. Input and output discs are each rotatably mounted in a drive head. When

Connecting element is provided an intermediate portion between the power cars. This is a support profile, the two in

Has longitudinally separate hollow chambers, wherein an upper run of the drive element in the one hollow chamber and a lower run of the

Drive element run in the other hollow chamber. A disadvantage of this known transmission that the support profile must be composed of two parts. Since the drive element is endless and can not be divided, the hollow chambers in order to accommodate the upper and the lower run in the respective hollow chamber, closed only after the placement of the drive element in the support section and fixed to each other. Due to the fact that the support profile in this way only when

Assembly of the transmission is mounted, the transmission requires a high assembly cost. Because of the divided hollow chambers is given to some extent how the support profile must be divided, also the support profile can not be optimally developed in terms of its stability and buoyancy. It is an object of the invention to provide a transmission which is easy to assemble and forms a stable and reliable connection between an input shaft and an output shaft. The object is achieved according to the invention by a transmission with the features of claim 1 and by a transmission manufacturing method with the

Characteristics of claim 1 1 solved. Advantageous developments of

Invention are listed in the subclaims. The invention is based on the idea to provide the intermediate portion of the housing with a contiguous cavity and the

To arrange drive element in the housing so that an upper run and a lower run of the drive element in the contiguous, surrounded by the intermediate portion cavity. In the manufacture of the transmission, the drive element can easily through this cavity in the

Be drawn intermediate section, so that the intermediate portion does not have to be assembled around the drive element from two or more parts. Upper strand and lower strand are those portions of the drive element, which are located between the input disk and the output disk, wherein the upper strand with respect to the placement orientation of

Transmission is located above the lower run. However, this does not mean that the gear must always be oriented horizontally. In a transmission with an obliquely or vertically arranged intermediate section is the

Mapping only the differentiation of the two dreams.

The term cavity here is to be understood mathematically, in the sense that a cavity in the intermediate section, which has one or more openings, that is not completely surrounded by the enclosing structure, is referred to herein as a cavity. In other words, the cavity is an air or gas filled one

contiguous three-dimensional area in the intermediate section, the is not divided by a structure of the intermediate section. Of the

In addition to openings at its ends or end faces, the intermediate section can therefore also have lateral openings along its

Have long sides, as long as they do not affect the static of the transmission too much. The cavity extends in an extending direction of the intermediate portion and has at the two ends of the intermediate portion openings through which the drive member is threaded into the cavity. The intermediate section and / or the cavity are in this case preferably designed to be stretched along the direction of extension. This means that they each have their largest along the extension direction

Have dimension.

In a preferred embodiment, however, encloses the

Intermediate section the upper strand and the lower strand perpendicular to

Extent direction essentially complete. In other words, the cavity in each cross-sectional plane perpendicular to the direction of extension is completely surrounded by the intermediate section. In addition, more

Cavities may be provided in the intermediate portion, which are parallel or partially parallel to the cavity in the extension direction of the

Extend intermediate section.

The intermediate portion may be formed of a plurality of parts which are bolted together, soldered, welded or other suitably releasably or permanently connected to each other. Preferably, however, the intermediate portion is formed in one piece or in one piece.

Preferably, the intermediate portion is formed as a hollow profile. Here, the intermediate portion preferably has a along the

Extension direction substantially constant cross section. The intermediate portion is thus therefore tubular, with a square, round, circular, rectangular, polygonal or the like

Cross-section. The intermediate section can be extruded or deformed, for example by means of press brakes or roll profiling and optionally subsequent welding or soldering.

According to an advantageous embodiment, the intermediate section is formed of a metal, in particular of aluminum or steel. In particular, the intermediate portion may be formed of stainless steel, which is for

hygiene-critical applications may be of importance, for example in the food industry. In the transmission two disks are provided, namely one with a

Input shaft connectable input disk and connectable to an output shaft output disk, which by means of the drive element

are rotationally coupled together. Conveniently, the housing encloses the input disk, the output disk and the drive element substantially completely.

In addition to the intermediate portion, the housing has an input portion and an output portion which at opposite ends of

Intermediate section are arranged. The designation of these sections of the housing is directed to the disks arranged in them, namely the input disk and the output disk. Preferably, however, the transmission is designed so that a torque transmission of the

Output disc can be done to the input disk. The intermediate portion extends in its extending direction from the input portion to the output portion and forms a rigid connection therebetween. This means that the opposing forces acting on the two discs due to the torque transmission are compensated by the intermediate section and need not be absorbed by external constructions.

In an advantageous embodiment, it is provided that the

Intermediate portion has on its outer surface one or more along the extension direction elongated longitudinal grooves or groove channels, in each of which a sliding block with an internal thread to Screwing the intermediate portion with the input portion and / or the output portion is arranged. The longitudinal groove extends

preferably along an entire length of the intermediate section. Connecting the intermediate section with the input or

Output section by means arranged in longitudinal grooves sliding blocks has the advantage that the distance between the input section and the

Output section can be controlled in a certain frame to adjust the bias of the drive element in the assembly of the transmission controlled and adapted to the particular application can.

An endless drive element is stretched over the input disk and the output disk such that a rotational movement of the input disk is transmitted by means of the drive element to the output disk.

Here, the drive element in the housing can be open, crossed or restricted. This means for the input disk and the

Output disc thus that they rotate in this gear parallel, antiparallel or at an angle to each other, in particular perpendicular to each other. In the latter case, therefore, the two discs are arranged with their axes perpendicular to each other.

The endless drive element can be any suitable endless element which is suitable for a rotational movement of the input disk on the

To transfer output disc. That it is endless means that it is

looped and has no beginning and no end. The endless shape should be given to the drive element during its manufacture. It is therefore not a band-shaped element whose beginning and end were connected to each other after threading in the intermediate element. This ensures that the drive element has sufficient strength and resistance to withstand the tensile forces acting on it. Preferably, the drive element is thus produced in one piece. The drive element may also be a metal band or a chain. However, according to a preferred embodiment, the

Drive element as a belt and the input disk and the output disk designed as pulleys. Here are different

Belt designs in question, for example flat belt, V-belt, V-ribbed belt, round belt or the like. In any case, the input disk and the output disk may be substantially the same size or have different diameters to provide a gear ratio in transmitting the rotational motion from the input disk to the input disk

To achieve output disc. This also applies to other drive elements that are not designed as belts.

According to a particularly preferred embodiment, the drive element is designed as a synchronous drive element or timing belt.

Accordingly, the input disk and the output disk are formed as synchronizing disks. The use of a

Synchronous drive element means that drive element and disc form a positive connection. When using belts which are not synchronous belts, the force transmission is effected by means of a frictional connection or a frictional connection. As synchronous belt is particularly suitable a timing belt, in which case the input disk and the output disk must be designed accordingly as toothed disks. Alternatively, the timing belt may also have other structures to form the positive engagement with corresponding structures on the pulleys.

In a preferred embodiment it is provided that the

Input section and / or the output section are each formed from two or more detachably connected section parts. The detachable connection is preferably a screw connection and / or a

Clamp connection. In each of the two sections, a roller bearing can be arranged, which is connected during assembly of the sections corresponding to the input disk or output disk. A two- or multi-part input section allows that during manufacture of the Gear through the intermediate section threaded end of the

Enclosed drive element with the section parts so that the drive element is placed around the input disk. The same applies to the output section.

In an advantageous development, it is provided that the input section and / or the output section are detachably connected to the intermediate section. This connection can preferably be effected by means of a screw connection and / or a clamping connection. The ability to solve the connection between the intermediate portion and at least one of the other sections again has the advantage that the distance between the

Input section and the output section is subsequently correctable.

According to an expedient embodiment, this correctability is supported by the fact that the input section and / or the output section each have a revision bore with a dome. Here, the inspection hole is arranged so that when looking at the

Inspection bore perpendicular to the extension direction, an edge region of the intermediate portion is visible through the inspection bore, and wherein the inspection bore and the dome are formed such that by inserting a tool into the inspection bore and attaching the tool to the dome the respective disc relative to the

Intermediate section can be moved to tension the drive element. To the distance between the input section and the

To increase output section and thus the distance between the input disk and the output disk and thus to bias the drive element fixed, first the respective section having the inspection bore must be released from the intermediate section. Subsequently, the tool, for example a screwdriver, is inserted into the inspection bore. By supporting the tool on the dome, the distance between the intermediate portion and the respective (end) portion is increased until the drive member has reached the desired preload. Finally, the releasable connection between the intermediate portion and the respective (end) section is restored.

In the manufacture or assembly of the transmission by means of the gearbox manufacturing process, a suitable intermediate section is provided. The drive element is threaded through with a loop end through the cavity of the intermediate section, so that it emerges at the other end of the intermediate section. In this way, both the upper run and the lower run of the drive element will run in the same cavity in the finished transmission. The protruding at one end of the intermediate portion portion of the drive element, so the threaded loop therearound, is arranged around the input disk, while the protruding at the other end of the intermediate portion portion of the drive element is arranged around the output disk. However, it is also possible that a portion of the drive element is arranged around the input disk or around the output disk before the drive element is threaded through the intermediate portion. But at least one of the two discs can be occupied only after the threading with the drive element. In addition, the input portion and the output portion must be connected to the intermediate portion so as to make the case

Input section, output section and intermediate section to form. This joining or fixing the two end portions of the housing to the

Intermediate section is preferably also after the threading of the drive element through the intermediate section.

The finished gear can now be used to transmit rotational motion from an input shaft to an output shaft. For this purpose, the input disk by means of a shaft-hub connection to the input shaft and the output disk are connected by means of another shaft-hub connection to the output shaft. Suitable shaft-hub connections for the

Transmission of torques are, for example, by means of a

Clamping set or produced by means of a feather key. The invention will be explained below with reference to embodiments with reference to the figures. 1 shows an arrangement in which a work machine by means of a

Drive element is freely connected to a motor;

2 shows an arrangement in which the working machine is connected to the motor by means of a gearbox according to an embodiment;

Fig. 3 shows the transmission of Fig. 2;

FIG. 4 is a partial exploded view of the transmission of FIG. 3; FIG.

Fig. 5 is a cross-sectional view through an intermediate portion of the housing of the transmission of Fig. 3;

Fig. 6 is a detail view illustrating the composition of the housing of an end portion and an intermediate portion; and FIG. 7 is a partial cross-sectional view of the transmission of FIG. 3.

Fig. 1 shows an arrangement in which a working machine 81 is operated by means of a motor 82. The transmission of the torque or the rotational movement from the motor 82 to the work machine 81 via a drive element 6, which is here and below as a toothed belt 6. For this purpose, the shaft of the motor 82 is connected as an input shaft 21 with an input disk 2. The shaft of the working machine 81 is correspondingly connected as an output shaft 31 with an output disk 3. Input disk 2 and output disk 3 are designed as toothed disks, in order to allow a synchronous torque transmission by means of the toothed belt 6.

The work machine 81 and the motor 82 are connected to each other via a frame structure 83. In the transmission of the torque from the input shaft 21 to the output shaft 31 by means of the toothed belt 6, further torques and forces are generated between the working machine 81 and the motor 82, which must be absorbed or compensated by the frame structure 83. This leads to a high Loading the frame structure 83, which must be designed accordingly. It comes to bending parts of the frame structure 83, which are illustrated in FIG. 1 by means of arrows 84. To avoid these deflections 84, instead of the free toothed belt 6 between the input shaft 21 and the output shaft 31, the here

described gear 1 used. In the transmission 1 are the

Input disk 2, the output disk 3 and the toothed belt 6 stretched between them surrounded by a housing 20, or in the present case completely enclosed. The transmission 1 is shown again separately in FIG.

The housing 20 of the transmission 1 is formed of three sections, namely an input section 4, in which the input disk 2 is rotatably mounted, an output section 5, in which the output disk 3 is rotatably mounted, and an intermediate section 7, which is a rigid connection between the Input section 4 and the output section 5 forms and at the same time encloses most of the toothed belt 6. The intermediate portion 7 serves to absorb opposing forces, which consist of biasing forces and superimposed operating forces between the input disk 2 and

Form output disk 3.

As already seen in Fig. 3, the input portion 4 and the output portion 5 are respectively divided into a first portion portion (41; 51) and a second portion portion (42; 52). This is illustrated even better in FIG. 4, which shows a partial explosion diagram of the transmission 1. There, the output section 5 is omitted together with the output disk 3. In the embodiment shown here, however, the input section 4 and the output section 5 are constructed substantially identically.

The toothed belt 6 is partially passed through the single cavity 71 of the intermediate portion 7 in the present embodiment, so that at the two ends of the intermediate portion 7 each have a Riemensch run 63, 64 stands out. Through the input side Riemensch run 63 then the input disk 2 is guided, so that the teeth of the toothed belt 6 engage in the input disk 2. Subsequently, the first portion portion 41 and the second portion portion 42 of the input portion 4 are placed around the input disk 2 and connected to each other. The connection of the two

Sectional parts 41, 42 takes place by means of four connecting screws 45. Each of the two section parts 41, 42 also has a revision bore 43, the inner surface of which merges into a dome 44. Through the inspection bore 43, an edge region 75 of the intermediate portion 7 is visible, so that the position of the input portion 4 can be checked with respect to the intermediate portion 7 and adjusted by inserting a suitable tool in the inspection bore 43 to adjust the bias of the belt 6.

Also visible in FIG. 4 are two longitudinal grooves 72, which extend on one side of the intermediate section 7 over its entire length. They are in the Fig. 5, which shows a cross-sectional view of the intermediate portion 7, in

Cross section to see. It is on two opposite sides of the

Intermediate portion 7 each provided two dovetail-like longitudinal grooves 72. In the present embodiment, the intermediate portion 7 has a constant cross section along its entire length and comprises a single cavity 71 in which the upper run 61 and the lower run 62 of the toothed belt 6 extend.

Fig. 6 illustrates the connection of the intermediate portion 7 with the input portion 4, which consists of two interconnected

Section parts 41, 42 is formed. For this purpose, in each longitudinal groove 72 a

Sliding nut 73 arranged with internal thread. In this sliding blocks 73 fixing screws 74 are screwed to the section parts 41, 42 am

To fix intermediate section 7. Due to the variable to some extent placement of the sliding blocks 73 in the longitudinal grooves 72, the distance between the intermediate portion 7 and the input portion 4 can vary, which will be explained with reference to the following Fig. 7. FIG. 7 shows a partial cross-sectional view of the input section 4 mounted on the intermediate section 7. The input section 4 encloses with its two section parts 41, 42 the input disk 2, which is rotatably mounted in the input section 4 by means of two roller bearings 25. The connection of the input disk 2 with a not shown here

Input shaft is effected by means of a shaft-hub connection, which takes place in FIG. 7 by means of a tensioning element 23. The clamping element 23 has an input shaft receptacle 22 into which the input shaft can be inserted. By tightening attached to the clamping element 23 clamping screws 24 are tightened, the diameter of the reduced

Input shaft receiving 22, so that the input shaft is more tightly enclosed.

The intermediate section 7 is positioned opposite the input section 4 such that its edge region 75 is visible through the inspection bore 43. FIG. 7 shows three different positions of the intermediate section 7 in the input section 4. When the intermediate portion 7 is fully inserted to a stop, then reaches the edge portion 75, the stop position 91. By inserting a tool, such as a screwdriver, in the inspection hole 43 and supports on the cap 44, the distance between the intermediate portion 7 and

Entrance section 4 are increased despite a possibly already partially tensioned toothed belt 6, for example, to achieve a central position 92 for the edge region 75. Finally, the intermediate portion 7 can be pulled so far out of the input section 4 until a

Maximalausrückposition 93 is reached, in which the toothed belt 6 is tensioned with a maximum tension around the input disk 2 and the output disk 3. LIST OF REFERENCE NUMBERS

1 gearbox 2 input disk

21 input shaft

22 input shaft

23 clamping element

24 clamping screws

25 rolling bearings

4 input section

41 first input section part

42 second input section part 43 revision bore

44 dome

45 connecting screws

3 output disk

31 output shaft

5 output section

51 first output section part

52 second output section part

6 drive element (toothed belt)

61 upper run

62 bottom strand

63 input side belt loop 64 output side belt loop

7 intermediate section

71 cavity 72 grooves

73 grooves stone

74 fixing screws

75 border area

81 work machine

82 engine

83 frame structure

84 bending arrows

91 stop position

92 middle position

93 maximum release position

Claims

claims:

1 . Transmission (1) comprising:

a input disk (2) connectable to an input shaft,

a starting disk (3) which can be connected to an output shaft,

- An endless drive element (6), which in such a way over the

Input disk (2) and the output disk (3) is stretched that a rotational movement of the input disk (2) by means of the drive element (6) is transmitted to the output disk (3) and

- one the input disk (2), the output disk (3) and the

Drive element (6) surrounding housing having an input portion (4) in which the input disk (2) is rotatably mounted, a

Output section (5) in which the output disc (3) is rotatably mounted, and in an extension direction of the

Entrance portion (4) to the output portion (5) extending and a rigid connection between the input portion (4) and the output portion (5) forming intermediate portion (7), characterized in that an upper run (61) and a lower run (62) of the drive element (6) in a coherent one of the

Between section (7) surrounded cavity (71) extend.

2. Transmission according to claim 1, characterized in that the

Intermediate section (7) substantially completely encloses the upper run (61) and the lower run (62) perpendicular to the extension direction.

3. Transmission according to claim 2, characterized in that the housing substantially completely encloses the input disk (2), the output disk (3) and the drive element (6).

4. Transmission according to one of the preceding claims, characterized

characterized in that the intermediate portion (7) is formed in one piece and / or as a hollow profile.

5. Transmission according to one of the preceding claims, characterized

characterized in that the intermediate section (7) on its outer

Surface has one or more along the extension direction elongated longitudinal grooves (72), in each of which a sliding block (73) with an internal thread for screwing the intermediate portion (7) with the input portion (4) and / or the output portion (5) is arranged.

6. Transmission according to one of the preceding claims, characterized

in that the input section (4) and / or the

Output section (5) in each case from two or more detachably connected section parts (41, 42, 51, 52) are formed.

7. Transmission according to one of the preceding claims, characterized

in that the input section (4) and / or the

Output section (5) with the intermediate portion (7) are detachably connected.

8. Transmission according to one of the preceding claims, characterized

in that the input section (4) and / or the

Output section (5) each have a revision bore (43) with a cap (44), wherein the inspection bore (43) is arranged such that when looking at the inspection bore (43) perpendicular to

Extension direction an edge region of the intermediate portion (7) through the inspection hole (43) is visible through, and wherein the

Inspection bore (43) and the cap (44) are formed such that by inserting a tool in the inspection bore (43) and attaching the tool to the dome (44), the respective disc (2, 3) relative to the intermediate portion (7) can be to tension the drive element (6).

9. Transmission according to one of the preceding claims, characterized

characterized in that the drive element (6) as a belt and the Input disc (2) and the output disc (3) are designed as pulleys.

10. Transmission according to claim 9, characterized in that the

Drive element (6) as a timing belt and the input disk (2) and the output disk (3) are designed as synchronizing disks.

1 1. A transmission manufacturing method for a transmission (1) having an input disk (2) connectable to an input shaft, one having a

Output shaft connectable output disc (3), one over the

Input disk (2) and the output disk (3) tensioned endless drive element (6) and the input disk (2), the

Output disc (3) and the drive element (6) surrounding housing, comprising the following steps:

Threading through the drive element (6) through an intermediate section (7) of the housing along an extension direction of the housing

Intermediate section (7) such that an upper run (61) and a lower run (62) of the drive element (6) extend in a continuous cavity (71) surrounded by the intermediate section (7),

Arranging one at one end of the intermediate section (7)

outstanding portion of the drive element (6) to the

Input disk (2),

- Arranging a at one other end of the intermediate portion (7) protruding portion of the drive element (6) to the

Output disk (3),

- Connecting an input section (4) in which the input disc (2) is rotatably mounted and an output section (5), in which the

Output disc (3) is rotatably mounted, with the intermediate portion (7) so as to form the housing of the input section (4), output section (5) and intermediate section (7).