JP2002031198A - Manual transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short and compact manual transmission for front-engine- front-drive vehicle capable of shortening an axial length of an intermediate shaft, particularly the one on which a large torque acts even though having a synchronizer exclusive for reverse stage. SOLUTION: This manual transmission comprises three intermediate shafts 11, 12 and 13. Its reverse stage is formed with a driving gear for low speed stage 1a arranged to rotate integrally on an input shaft 10, a first driving gear exclusive for reverse stage Ra engaged with a play on the third intermediate shaft 13, the synchronizer Rs arranged on the third intermediate shaft 13 and adapted to engage and disengage the first driving gear exclusive for reverse stage Ra, a second driving gear exclusive for reverse stage Rb arranged to rotate integrally on the third intermediate shaft 13 and a driven gear for middle speed stage 3b arranged to rotate integrally on the second intermediate shaft 12. Since driven gears for first speed and second speed 1b, 2b are supported, elements for first speed stage and second speed stage are solely arranged on the first intermediate shaft 11 acted on with a large torque, thereby shortenes the axial length 1 of the intermediate shaft 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual transmission, and more particularly to a manual transmission for an FF vehicle in which an engine is disposed horizontally.

[0002]

2. Description of the Related Art In an FF vehicle in which an engine is arranged horizontally, a more compact transmission is required as the size of the vehicle is reduced, the number of cylinders of the engine is increased, and the speed of the transmission is increased. In particular, the overall length of the transmission is an important factor because it has a large effect on the controllability such as the turning radius of the vehicle. On the other hand, in recent years, there has been an increasing demand for improved operability, and it has been required to add a synchronization device to the reverse gear. Therefore, WO 97/13990 proposes a manual transmission having two intermediate shafts, and having a reverse gear provided on one of the intermediate shafts.

Referring to FIG. 3, the structure of the manual transmission according to the conventional example will be described in detail. First and second intermediate shafts 111 and 11 are arranged in parallel with an input shaft 110 and an output shaft 113.
2 are arranged. Input shaft 110 and first intermediate shaft 11
1, a first to fourth speed gear trains I, II, III, and IV are provided. The fifth and sixth gear trains V and VI are provided between the input shaft 110 and the second intermediate shaft 112.

The reverse gear R includes a first-speed drive gear 101a on the input shaft 110, a first-speed driven gear 101b on the first intermediate shaft 111, and a reverse-stage dedicated drive gear 10 integrated therewith.
0Ra, driven gear 1 exclusively for reverse gear on second intermediate shaft 112
00Rb and a reverse stage synchronizer 100Rs.

The first intermediate shaft 111 has a 1-2
Medium speed and the 3-4 speed synchronizer 111S _1, 111S ₂ are arranged, the second is on the intermediate shaft synchronization the reverse gear unit R
Although the synchronizer 112s for the s and 5th-6th gears are arranged, no synchronizer is arranged on the input shaft 110.

[0006]

Continuing to refer to FIG. 3, in the manual transmission proposed in WO 97/13990, of the two intermediate shafts 111 and 112, the first intermediate shaft 111 Above, a number of forward gears,
That is, the first-speed driven gear 101b, the second-speed driven gear 102b, the third-speed driven gear 103b, the fourth-speed driven gear 104b, and the reverse gear 100Ra are arranged in series. Therefore, it is necessary to make the axial length of the first intermediate shaft 111 sufficiently long.

Since the first and second speeds have a large reduction ratio, a large torque is applied particularly to the first speed driven gear 101b and the second speed driven gear 102b among the four gears. Join. Therefore, in order to secure sufficient bending rigidity, it is necessary to make the first intermediate shaft 111 thick.

After all, according to the configuration of the manual transmission proposed in the above-mentioned WO 97/13990, the first intermediate shaft 1
11 must be formed long and thick, and as a result, there arises a problem that the manual transmission is enlarged and a rotational loss of the first intermediate shaft 111 is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a manual transmission which can shorten the length of an intermediate shaft, especially an intermediate shaft to which a large torque is applied, in spite of having a synchronizing device dedicated to the reverse gear, particularly a compact short-length transmission. It is an object of the present invention to provide a manual transmission for a simple FF vehicle.

[0010]

In the manual transmission according to the present invention, the reverse gear has a drive gear for a low gear arranged so as to rotate integrally with the input shaft and a free fit on the third intermediate shaft. A first reverse gear dedicated to the reverse gear, a reverse gear synchronizing device disposed on a third intermediate shaft for engaging and disengaging the third intermediate shaft and the first dedicated drive gear for the reverse gear, and A second reverse gear exclusively disposed on the third intermediate shaft so as to rotate integrally therewith, and a driven gear for a middle speed stage disposed so as to rotate integrally on the second intermediate shaft. You. Further, a driven element for a middle speed stage (including a driven gear for a middle speed stage which is a component of the reverse speed stage) and a driven element for a high speed stage are arranged on the second intermediate shaft, respectively. A driven element for a low speed stage is disposed on the first intermediate shaft.

According to this manual transmission, the driving force is transmitted at the reverse speed by using the gears for the low speed stage and the middle speed stage. This eliminates the need to dispose an element dedicated to the reverse gear on the input shaft and the second intermediate shaft that determine the overall length of the manual transmission. For this reason, the middle speed step and the high speed step element can be arranged on the input shaft and the second intermediate shaft without increasing the axial lengths of the input shaft and the second intermediate shaft. In particular, the driven elements of the middle speed stage and the high speed stage can be arranged on the second intermediate shaft. By arranging the middle speed stage and the high speed stage element on the input shaft and the second intermediate shaft in this manner, the remaining first intermediate shaft has a length enough to arrange only the low speed stage element (particularly, the driven element). Is enough. Therefore, the first intermediate shaft can be formed sufficiently short to increase its bending stiffness. As a result, the thickness and weight of the first intermediate shaft can be reduced.
Further, even when the gear trains of the first speed to the highest speed are arranged at positions different from each other along the axial direction of the manual transmission (in this case, the degree of freedom in setting the gear ratio is increased), the present invention is applied. , The shaft length of the manual transmission can be made sufficiently short.

In the reverse gear, power is supplied to the low-speed drive gear, the first and second reverse gears arranged on the third intermediate shaft, and the second intermediate shaft. Power is transmitted in the order of the driven gear for the middle speed stage.

[0013] Other aspects and features of the present invention are as described in each claim, and the duplicate description will be omitted by quoting. Thus, the features of each claim are deemed to be as set forth herein. In addition, each dependent claim does not contravene the principle of the invention described in each independent claim.
Applicable to each independent claim, and dependent claims may apply to other dependent claims.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described.

In a preferred embodiment of the present invention,
The driven elements for the middle speed stage and the high speed stage are arranged on the second intermediate shaft, the synchronization element for the middle speed stage is arranged on the input shaft, and the synchronization element for the high speed stage is arranged on the second intermediate shaft. And the driven element for the low-speed gear or a synchronous element thereof is arranged on the first intermediate shaft.

In a preferred embodiment of the present invention,
A low-speed stage element (driven element) is arranged on the first intermediate shaft,
Middle speed and high speed elements (driven elements) are arranged on the second intermediate shaft, and reverse gear elements are arranged on the third intermediate shaft.

In a preferred embodiment of the present invention,
Along the axial direction of the manual transmission, between the low-speed gear train including the shared element also used in the reverse gear and the middle-speed gear train including the shared element also used in the reverse gear, the other gear train Elements are arranged.

In a preferred embodiment of the present invention,
One synchronizer is located on each axis. Preferably, a synchronizer for the middle gear on the input shaft, a synchronizer for the lower gear on the first intermediate shaft, a synchronizer for the higher gear on the second intermediate shaft,
Synchronizing devices for the reverse gear are respectively arranged on the third intermediate shaft. In this way, by distributing one synchronizer for each axis, the axis length of each axis can be shortened as a whole.

In a preferred embodiment of the present invention,
There is a large gap between the portion where the small-diameter driven gear for high-speed gear meshes with the drive gear and the gear piece where the small-diameter driven gear for high-speed gear meshes with the sleeve of the synchronizer in the axial direction of the manual transmission. It is configured such that the outer peripheral portion of the first reverse-stage dedicated gear formed to have a diameter is located.

In a preferred embodiment of the present invention,
The rear speed stage includes a drive gear for low speed stage and a driven gear for middle speed stage. Preferably, the reverse gear includes a first speed drive gear and a third speed driven gear.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the preferred embodiments of the present invention described above, an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a gear train diagram of a manual transmission according to one embodiment of the present invention. FIG. 2 is a shaft layout of the manual transmission shown in FIG.

[Axis] Referring to FIGS. 1 and 2, this manual transmission has an input shaft 10 and an output shaft 14 arranged in parallel with each other. , First, second and third intermediate shafts 11, 12, 13 are arranged.

[Gear] On the input shaft 10, in order from right to left in FIG. 1, a fifth speed drive gear 5a, a first speed drive gear 1a, a second speed drive gear 2a, A sixth-speed drive gear 6a, a third-speed drive gear 3a, and a fourth-speed drive gear 4a are arranged. The first, second, fifth and sixth speed drive gears 1a, 2a, 5a and 6a rotate integrally with the input shaft 10. The third and fourth speed drive gears 3a and 4a are loosely fitted on the input shaft 10 and are rotatable relative to the input shaft 10.

On the first intermediate shaft 11, a first final drive gear 11a and a first final drive gear 11a are arranged in order from right to left in FIG.
The speed driven gear 1b and the second speed driven gear 2b are arranged. The first and second speed driven gears 1b, 2b
Is loosely fitted on the intermediate shaft 11 and is rotatable relative to the first intermediate shaft 11.

On the second intermediate shaft 12, a second final drive gear 12a, a fifth
A driven gear for speed 5b, a driven gear for sixth speed 6b, a driven gear for third speed 3b, and a driven gear for fourth speed 4b are arranged. The third and fourth speed driven gears 3b, 4b rotate integrally with the second intermediate shaft 12. 5th and 6th speed driven gear 5
b and 6b are loosely fitted on the second intermediate shaft 12 and are relatively rotatable with the second intermediate shaft 12.

On the third intermediate shaft 13, in order from the right to the left in FIG.
a and Rb are arranged. First reverse gear gear Ra
Is loosely fitted on the third intermediate shaft 13 and is rotatable relative to the third intermediate shaft. The second reverse stage-dedicated gear Rb is
With the intermediate shaft 13.

[Synchronizer] On the input shaft 10, between the third-speed drive gear 3a and the fourth-speed drive gear 4a, a third-fourth-speed synchronizer 10s is arranged. The third- and fourth-speed synchronizers 10s selectively engage and disengage the third-speed drive gear 3a and the fourth-speed drive gear 4a with the input shaft 10, and rotate the engaged gear integrally with the input shaft 10. Let it.

On the first intermediate shaft 11, the first speed driven gear 1
Between the gear b and the driven gear 2b for the second speed, a synchronizer 11s for the first and second speeds is arranged. First-second speed synchronizing device 1
1s is a first speed driven gear 1b and a second speed driven gear 2
b is selectively engaged with and disengaged from the first intermediate shaft 11, and the engaged gear is rotated integrally with the first intermediate shaft 11.

On the second intermediate shaft 12, the fifth speed driven gear 5
A fifth-sixth-speed synchronizer 12s is disposed between the gear b and the sixth-speed driven gear 6b. Synchronizer 1 for 5th-6th gear
2s is a fifth-speed driven gear 5b and a sixth-speed driven gear 6
b is selectively engaged with or disengaged from the second intermediate shaft 12, and the engaged gear is rotated integrally with the second intermediate shaft 12.

A reverse gear synchronizer Rs is arranged on the third intermediate shaft 13 between the first reverse gear dedicated to the reverse gear Ra and the second gear dedicated to the reverse gear Rb. Reverse stage synchronizer Rs
Engages and disengages the first reverse stage dedicated gear Ra with the third intermediate shaft 13. The engaged first reverse gear only Ra rotates integrally with the third intermediate shaft 13.

[Gear forward gear train] The first speed drive and driven gears 1a and 1b are meshed with each other, and they constitute a first speed gear train I. Second speed drive and driven gears 2a, 2b
Are meshed with each other to form a second speed gear train II. The third speed drive and driven gears 3a and 3b are meshed with each other, and constitute a third speed gear train III. The fourth-speed drive and driven gears 4a and 4b are meshed with each other, and constitute a fourth-speed gear train IV. The fifth speed drive and driven gears 5a and 5b are meshed with each other, and they constitute a fifth speed gear train V. 6th speed drive and driven gear 6a,
6b are meshed with each other to form a sixth speed gear train VI.

Next, the configuration of the reverse stage R will be described in detail. Subsequently, referring to FIG. 1 and FIG.
In the order of power transmission, the reverse gear R includes a first speed drive gear 1a, a first reverse gear dedicated Ra, a reverse gear synchronizer Rs, a second reverse gear dedicated Rb, and a third driven gear. It is configured to include the gear 3b. At the time of reverse travel, the sleeve of the reverse gear synchronizer Rs is shifted toward and engaged with the first reverse gear Ra, and the first reverse gear R is engaged.
a and the third intermediate shaft 13 rotate integrally.

The power transmission path at the time of the reverse gear will be described. The torque input to the input shaft 10 includes the first-speed drive gear 1a, the first reverse gear gear Ra, the sleeve of the reverse gear synchronizer Rs, A third intermediate shaft 13, a second reverse stage dedicated gear Rb, a third speed driven gear 3b, a second intermediate shaft 12,
The power is transmitted to the output shaft 14 via the second final drive gear 12a and the final driven gear 14a.

[Overall Arrangement] A low-speed driven element (a first and second speed driven gear 1b,
2b) are arranged in parallel, and on the second intermediate shaft 12, a middle speed driven element and a high speed driven element (third speed and fourth speed driven gears 3 b and 4 b, fifth speed and sixth speed driven gears) 5b, 6
b) are arranged in parallel, and reverse gear elements (first and second reverse gears Ra, Rb) are arranged in parallel on the third intermediate shaft 13.

Along the axial direction of the manual transmission, a low-speed gear train (I-row) including a shared element (first speed drive gear 1a) also used in the reverse gear, and also used in the reverse gear. Elements of another row (rows II and VI) are arranged between middle-speed gear trains (row III) including shared elements (third-speed driven gear 3a).

The fifth-speed driven gear 5b, which is formed to have a small diameter, has a large gap between the portion where the fifth-speed driven gear 5a meshes with the fifth-speed driven gear 5b and the gear piece of the fifth-speed driven gear 5b in the manual transmission axial direction. The outer peripheral portion of the first reverse gear dedicated to reverse stage Ra having a diameter is located.

[Advantages of the Manual Transmission According to the Present Embodiment] Next, advantages of the above-described manual transmission will be described.
Referring again to FIGS. 1 and 2, in the reverse gear of the manual transmission, the reverse gear dedicated element is disposed on the third intermediate shaft 13, so that the input gear 10 and the second intermediate gear are provided. Axis 1
2, the middle speed step and the high speed step element can be arranged without increasing the axial length. Thus, only the low-speed gear elements (the first and second speed driven gears 1b and 2b and the first and second speed synchronizers 11s) can be arranged on the remaining first intermediate shaft 11. As a result, the axial length "l" of the first intermediate shaft 11 according to the embodiment shown in FIG. 1 is changed to the axial length "L" of the first intermediate shaft 111 according to the conventional example shown in FIG.
Can be very short.

While the present invention has been described with reference to an example in which the present invention is embodied as a transmission having six forward speeds and one reverse speed, aspects of the present invention are not limited to this embodiment. Machine.

[0040]

According to the present invention, there is provided a manual transmission structure capable of shortening the length of each intermediate shaft, particularly the intermediate shaft to which a large torque is applied, despite having a synchronizer dedicated to the reverse gear. Provided. According to the present invention, a compact manual transmission with a short overall length is provided, which is particularly suitably applied to FF vehicles.

[Brief description of the drawings]

FIG. 1 is a gear train diagram of a manual transmission according to one embodiment of the present invention.

FIG. 2 is a shaft arrangement diagram of the manual transmission shown in FIG. 1;

FIG. 3 is a gear train diagram of a manual transmission according to a conventional example.

[Explanation of symbols]

 1a 1st speed driven gear 1b 1st speed driven gear (low speed stage driven element) 2a 2nd speed driven gear 2b 2nd speed driven gear (low speed stage driven element) 3a 3rd speed driving gear 3b 3rd Speed driven gear (medium speed driven element) 4a 4th speed driven gear 4b 4th speed driven gear (medium speed driven element) 5a 5th speed driven gear 5b 5th speed driven gear (high speed driven gear) 6a 6th speed driven gear 6b 6th speed driven gear (high speed driven element) 10 input shaft 10s 3rd to 4th speed synchronizing device (medium speed synchronizing element) 11 first intermediate shaft 11a 1st 11s 1st-2nd speed synchronizing device (low speed stage synchronizing element) 12 2nd intermediate shaft 12a 2nd last driving gear 12s 5th-6th speed synchronizing device (high speed stage synchronizing element) 13 3rd Intermediate shaft 14 output shaft 14a final driven gear l shaft length of first intermediate shaft Reverse stage Ra First reverse stage dedicated gear Rb Second reverse stage dedicated gear Rs Reverse stage synchronizer I First gear train II Second gear train III Third gear train IV Fourth gear Gear train V Gear train for fifth speed VI Gear train for sixth gear

Claims (4)

[Claims] An input shaft, and first, second, and third intermediate shafts arranged in parallel with the input shaft, and a reverse gear rotates integrally with the input shaft on the input shaft. A low-speed gear, a first reverse gear exclusively fitted on the third intermediate shaft, and a third intermediate gear disposed on the third intermediate shaft. A reverse gear for engaging and disengaging a shaft and the first reverse gear, and a second reverse gear exclusively disposed on the third intermediate shaft so as to rotate integrally with the third intermediate shaft. A gear and the second intermediate shaft on the second intermediate shaft.
And a driven gear for a middle speed stage arranged so as to rotate integrally with the intermediate shaft of the second stage. Further, driven elements for the middle speed stage and the high speed stage are provided on the second intermediate shaft. And a driven element for a low-speed gear is disposed on the first intermediate shaft. 2. The manual transmission according to claim 1, wherein no elements dedicated to the reverse gear are arranged on the input shaft, the first intermediate shaft, and the second intermediate shaft. 3. A synchronizer for a middle speed stage on the input shaft, a synchronizer for a low speed stage on the first intermediate shaft, and a synchronizer for a high speed stage on the second intermediate shaft. The manual transmission according to claim 1, wherein the manual transmission is arranged. 4. An input shaft; first, second, and third input shafts arranged in parallel with the input shaft; and a first shaft arranged on the input shaft so as to rotate integrally with the input shaft. A first speed drive gear, a second speed drive gear, a fifth speed drive gear and a sixth speed drive gear, and a loosely fitted third speed drive gear and a fourth speed drive gear; A first-speed driven gear and a second-speed driven gear loosely fitted on the intermediate shaft; a fifth-speed driven gear and a sixth-speed driven gear loosely fitted on the second intermediate shaft; A third-speed driven gear and a fourth-speed driven gear arranged to rotate integrally with the second intermediate shaft; and meshed with the first-speed driving gear loosely fitted on the third intermediate shaft. A first reverse-stage dedicated gear, and a second reverse-stage dedicated drive gear disposed on the third intermediate shaft so as to rotate integrally with the third intermediate shaft; Fill force is placed on the shaft, a third of the third speed drive gear and the fourth speed drive gear disengaged selectively engaged with the input shaft
A fourth-speed synchronizing device, and a first gear disposed on the first intermediate shaft for selectively engaging and disengaging the first-speed driven gear and the second-speed driven gear with the first intermediate shaft. A second-speed synchronizing device, and a fifth gear disposed on the second intermediate shaft for selectively engaging and disengaging the fifth-speed driven gear and the sixth-speed driven gear with the second intermediate shaft. A synchronizer for -6th speed, and a synchronizer for reverse gear disposed on the third intermediate shaft and engaging and disengaging the third intermediate shaft and the first reverse gear only. Features a manual transmission.