DE102008001615A1 - Manually or automatically shifted manual transmission or dual-clutch transmission in countershaft design - Google Patents

Abstract

It is proposed a manually or automatically switched manual or double clutch transmission in countershaft design, comprising a drive shaft (2) and a parallel to the drive shaft arranged countershaft (3, 8), in which the individual gears by activating each of a translation stage, comprising a loose wheel (4, 4 ', 11, 13) and a fixed gear (5, 5', 10, 14) of different shafts (2, 3, 8) which are in operative connection with each other, wherein the activation by actuation of a switching element (6, 15 ) takes place, by means of which the respective idler gear is rotatably connected to the shaft to which it is associated, wherein at least one gear ratio corresponding to a forward gear is formed by a toothed belt or toothed chain stage.

Description

The The present invention relates to a manual or automated switched gearbox or dual clutch transmission in countershaft design according to the preamble of claim 1.

transmission in countershaft design, especially for motor vehicles, According to the prior art, a drive shaft (main shaft) and at least one countershaft fixedly mounted in the gear housing, which is second to the main shaft. For some transmissions the countershaft is designed as an output shaft; is not this the case, the output shaft can be coaxial with the main shaft or be arranged to the countershaft. Furthermore, it is usually provided for the realization of the intermediate passage an intermediate shaft.

in this connection have the drive shaft, the countershaft and possibly the output shaft Gears in the form of fixed and loose wheels, which are engaged with each other and the translation stages form the transmission, wherein a translation stage by actuation a switching element and the resulting rotationally fixed connection a loose wheel with the corresponding shaft is activated. The drive shaft is usually via a spur gear, the so-called drive constant connected to the countershaft.

From the DE 202 025 81 U1 The applicant is a gear train in countershaft design known, which has a drive shaft, an output shaft, a countershaft and an intermediate shaft for the reverse gear. In the known transmission, the countershaft is arranged coaxially with the output shaft and the drive shaft offset from the axis to the output shaft. In this case, the engagement of two gears of different shafts with each other causes a single translation, which can be used to generate the gear ratio, wherein the individual ratios can be activated by means of switching elements.

Out In the prior art, toothed belt or toothed chain drives are only for synchronous drive tasks in mechanical and plant engineering or for driving auxiliary consumers or the camshaft Motor vehicles comprising an internal combustion engine known. Further are in motorcycles final drives in the form of chains or Timing belt widely used.

Of other switchable chain drives are known in bicycles, where by changed spatial allocation a single chain to different drive and driven wheels the translations are set.

In Transmission technology are stepless motor vehicle transmissions with belting based on frictional power transmission known.

toothed belt have the advantage that they have a very high power density can reach that of the order of magnitude the power density of spur gears comes very close. Another Advantage is that the noise very is low.

Of others are those in a torque transmission by means of toothed belt resulting losses only by the deformation of the strand and not caused by sliding movements, as it is the case with gears Case is, with timing belts in principle no oil for cooling or need lubrication, so that high efficiency can be achieved at low drag losses.

Of the present invention is based on the object, a manual or automatically switched gearbox or dual-clutch gearbox to specify in countershaft design, which has a high efficiency and ge rings tow losses and compact can. In addition, the transmission according to the invention a lower one compared to prior art transmissions Have weight and be inexpensive to produce.

These The object is solved by the features of claim 1. Further embodiments and advantages of the invention are apparent from the dependent claims.

Therefore is a manually or automatically switched manual transmission or dual-clutch transmission proposed in countershaft design, comprising a drive shaft and a parallel to the drive shaft arranged Countershaft, where the individual gears by activation each of a translation stage, comprising a loose wheel and a fixed wheel of different waves, which interact with each other be produced, the activation by actuation a switching element takes place by means of which the respective idler gear with the shaft to which it is assigned, rotatably connected. in this connection is at least one forward gear corresponding translation stage formed by a toothed belt or tooth chain stage.

By torque transmission by means of toothed belt or toothed chain stages there are no radial and axial forces; In addition, the Forces on the shafts and bearings of the transmission clearly less than when executing the translation stages by means of gears, whereby the transmission is very compact dimensions can be.

According to one Development of the invention, the wheels of the gear stages designed as toothed belt or toothed chain stages made of aluminum or plastic instead of steel, which further reduces weight and costs.

The Gear according to the invention can be as manual or automatically switched gearbox or as dual-clutch gearbox each executed with any structure and any number of gears be, where as switching elements conventional claws, synchronizers and / or lamellar switching elements etc. can be used.

in the Within the scope of a further embodiment of the invention by partial use of identical wheels different translations be generated because the diameter of the wheels are not through the distance between the waves, but only through the division and the number of teeth are given.

Therefore can be provided that at least one fixed wheel with constant Diameter, same pitch and same number of teeth for at least two axially considered juxtaposed as toothed belts or Zahnkettenstufen formed translation stages simultaneously different translation of these stages due to different diameter of the opposite, the fixed gear associated loose wheels is used.

The Invention will be described below with reference to the accompanying figures exemplified in more detail. Show it:

1 : A schematic view of an embodiment of a transmission according to the invention;

2 : A schematic sectional view of another embodiment of a transmission according to the invention with coaxial driving and driven;

3 : A schematic sectional view of another embodiment of a transmission according to the invention bes, in which a fixed wheel is used for two adjacent stages; and

4 : A schematic representation of the use of a fixed wheel in different gears.

Of the general structure of gears in countershaft design is the expert well known, so that in the context of the description of the figures only the Invention-relevant components described and explained become.

In 1 is an inventive transmission 1 shown, which has a drive shaft 2 and has a parallel to the drive shaft arranged countershaft, as the output shaft 3 serves. On the drive shaft 2 are several loose wheels 4 arranged, which by the actuation of a switching element 6 with the drive shaft 2 are rotationally connected. Every idler wheel 4 is to form a translation stage one on the output shaft 3 arranged and with her rotatably connected fixed wheel 6 assigned, wherein the translation stage is designed as a toothed belt or toothed chain stage; in 1 is the toothed belt or chains with the reference numeral 7 Mistake.

In 2 is another inventive transmission shown schematically. Here are the drive shaft 2 and the output shaft 3 arranged coaxially with each other; the power flow is from the idler gears 4 having drive shaft 2 via a fixed wheels assigned to the loose wheels 5 having countershaft 8th about another translation level 9 on the output shaft 3 directed. Also in this embodiment, the gear ratios are designed as Zahnriemen- or Zahnkettenstufen.

The use of timing belts or toothed chains allows the common use of at least one fixed wheel with constant diameter, pitch and same number of teeth for at least two considered axially arranged as Zahnriemen- or Zahnkettenstufen gear ratios associated with different translation of these stages due to different diameter of the opposite the fixed wheel loose wheels. This advantageous embodiment is the subject of 3 and 4 ,

At the in 3 embodiment shown, the transmission 1 a countershaft 8th on, on the three fixed wheels 5 . 5 . 5 ' and two loose wheels 11 . 13 are arranged. On the drive shaft 2 are two fixed wheels 10 . 14 and three loose wheels 4 . 4 . 4 ' arranged. Furthermore, the output shaft 3 by the actuation of a switching element 6 with the drive shaft 2 directly connectable.

The idler gears are here by the operation of a switching element 6 to activate a translation stage with the respective shaft 2 . 8th rotatably connected. The power flow is from the drive shaft 2 about the countershaft 8th and over one of the opposite wheels 5 and 16 formed translation stage 9 on the output shaft 3 directed. In this embodiment, all gear ratios for generating the forward gears are designed as Zahnriemen- or Zahnkettenstufen, the toothed belts or chains with 7 are designated.

Under the respective wheel of the countershaft 8th is in 3 the gear indicated, which corresponds to the gear ratio, which is formed by the wheel. How out 3 Obviously, the fixed wheel becomes 5 ' the countershaft 8th used for generating the gear ratios for the third and the fifth forward gear, wherein the different gear ratios by the different diameter of the counter wheels 4 . 4 ' the drive shaft 2 be generated.

This is also based 4 illustrates in which the fixed wheel 5 ' the countershaft 8th and the two with this fixed gear on each a toothed belt or a toothed chain 7 in operative connection and on the drive shaft 2 stored loose wheels 4 . 4 ' are shown; that with 4 ' designated idler gear is used to realize the fifth gear while the idler gear 4 used to shift the third gear.

In the transmission according to 3 the reverse gear is through a conventional spur gear 12 formed with teeth for realizing a reversal of direction. Here, the power flow from the fixed wheel 14 the drive shaft 2 on by pressing the switching element 15 with the countershaft 7 rotatably connectable idler gear 13 directed. Subsequently, the power flow through the translation stage 9 on the output shaft 3 directed. The inventive concept advantageously eliminates the need for an intermediate shaft to generate the required direction of rotation reversal.

Of course Every constructive training, especially every one, also falls spatial arrangement of the components of the invention Transmission in itself and to each other and as far as technically sensible, within the scope of the present claims, without the function of the transmission as specified in the claims is to influence, even if these training is not explicit are shown in the figures or in the description.

1

transmission

2

drive shaft

3

output shaft

4

Losrad

4 '

Losrad

5

fixed gear

5 '

fixed gear

6

switching element

7

timing belt, toothed chain

8th

Countershaft

9

translation stage

10

fixed gear

11

Losrad

12

spur gear

13

Losrad

14

fixed gear

15

switching element

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 20202581 U1 [0004]

Claims (9)

Manually or automatically shifted manual transmission or dual clutch transmission in countershaft design, comprising a drive shaft ( 2 ) and a parallel to the drive shaft arranged countershaft ( 3 . 8th ), in which the individual gears are activated by activation of at least one transmission stage, comprising a loose wheel ( 4 . 4 ' . 11 . 13 ) and a fixed wheel ( 5 . 5 ' . 10 . 14 ) of different waves ( 2 . 3 . 8th ), which are in operative connection with each other, are generated, wherein the activation by actuation of a switching element ( 6 . 15 ) takes place, by means of which the respective idler gear with a shaft or another idler gear, which is associated with it, is rotatably connected, characterized in that at least one forward gear corresponding translation stage is formed by a toothed belt or toothed chain stage. Manually or automatically shifted manual transmission or dual-clutch transmission in countershaft design, according to claim 1, characterized in that the reverse gear through a conventional spur gear ( 12 ) is formed with teeth for realizing a reversal of direction. Manually or automatically shifted manual transmission or dual-clutch transmission in countershaft design, according to claim 1 or 2, characterized in that the countershaft ( 8th ) as output shaft ( 3 ) serves. Manually or automatically shifted manual transmission or dual-clutch transmission in countershaft design, according to one of the preceding claims 1 or 2, characterized in that the countershaft ( 8th ) by means of a translation stage ( 9 ) with an output shaft ( 3 ) connected is. Manually or automatically shifted manual transmission or dual-clutch transmission in countershaft design, according to claim 4, characterized in that the translation stage ( 9 ) is formed by a Zahnriemen- or Zahnkettenstufe. Manually or automatically switched manual transmission or dual clutch transmission in countershaft design, according to claim 4 or 5, characterized in that the output shaft by means of a switching element ( 6 ) directly to the drive shaft ( 2 ) is connectable. Manually or automatically switched manual transmission or dual-clutch transmission in countershaft design, according to one of the preceding claims, characterized in that at least one fixed wheel ( 5 ' ) with constant diameter, the same pitch and the same number of teeth for at least two axially formed side by side as Zahnriemen- or Zahnkettenstufen formed gear ratios at the same time different translation of these stages due to different diameter of the opposite, the fixed gear associated loose wheels ( 4 . 4 ' ) is used. Manually or automatically switched manual transmission or dual clutch transmission in countershaft design, according to one of preceding claims, characterized in that the Wheels of gear stages designed as toothed belt or toothed chain stages made of aluminum or plastic. Manual or automated shifted manual transmission or dual clutch transmission in countershaft design, according to one of the preceding claims, characterized in that the switching elements ( 6 . 15 ) are designed as conventional claws, synchronizers and / or lamellar switching elements.