JPH04211752A - Spur gear transmission - Google Patents

Abstract

PURPOSE: To axially contract a spur gear transmission having at least two shafts holding an idle pulley 3 and a fixed gear engaged with each other and a case closed by a cover at the shaft end. CONSTITUTION: Shafts 1, 2 ends in front of a cover 7 having support pins 8, 9 projecting inward. Bushes 10, 11 are fixed in the shafts 1, 2 by screws, and its inner face and a part of the outer face form a support face for an idle gear 3 adjacent to the support pin 8 and the cover 7 or holds a twin gear 4 as a centering bush 11. The twin gear 4 is connected to the opposite shaft 2 to prevent the relative rotation and supported on the support pin 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spur gear transmission having at least two shafts holding idle gears and fixed gears that mesh with each other, and a case whose shaft end is closed by a lid.

0002

BACKGROUND OF THE INVENTION Hitherto, shafts have been extracted from gear wheels adjacent to the lid and supported on the lid by suitable bearings. thereby causing the lid to bulge out at least in the area of this bearing, or
Alternatively, since the transmission case must have an appropriate thickness, the overall length of the transmission case becomes significantly longer in the axial direction.

0003

OBJECT AND SUMMARY OF THE INVENTION The problem on which the invention is based is therefore to provide a spur gear transmission of the type mentioned in the first place, which is desirable in many cases, especially in vehicle design, without excessive technical outlay. or a significant reduction in the axial dimensions of the case is required.

0004

[Means for Solving the Problems] To solve this problem, according to the present invention, a shaft ends in front of a lid, the lid has a support pin projecting inwardly, and a bushing is screwed to each shaft. Either a support surface for an idler gear adjacent to the support pin and the lid is formed on a part of its inner and outer surfaces, or a twin gear is held as a centering bush so that the twin gear is positioned relative to the corresponding shaft. They are non-rotatably coupled and supported on support pins.

[0005]

[Effects of the Invention] Since the shaft ends in front of the lid, and this lid has a support pin that projects inward into the case, the conventional bulge or bearing plate is no longer necessary. ，
The lid can be constructed virtually flat, thus resulting in the desired shortening of the transmission housing. Nevertheless, the shaft is well supported at its ends and can easily absorb the forces occurring in the gear pair adjacent to the lid. This is because in an idler gear, a bushing fixedly connected to the corresponding shaft is supported on a support pin and forms a bearing for the idler gear, whereas in a fixed gear, a bushing holds a twin gear and this twin gear This is because the gear itself is supported on the support pin and is coupled to the shaft so as not to rotate relative to it.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS It is also obvious that a needle bearing or the like is provided between the support pin and the bush or twin gear, and that such a support of the idle gear on the bush is advantageous. Of course, the bushing is also used to fix the bearing in the axial direction.

[0007]

[Example] A spur gear transmission has two shafts 1 and 2.
An idler gear 3 is supported on top and meshes with a fixed gear on the other shaft 2 forming a twin gear 4. Both idler gears 3 can be coupled alternately to the shaft 1 so that they do not rotate relative to each other by means of shift sleeves 5 that engage with shift forks (not shown), but the twin gears 4 are connected to the shaft 2 from the beginning so that they do not rotate relative to each other. is combined with A housing 6 is provided for the entire transmission and is closed off by a flat lid 7.

As can be seen, both shafts 1, 2 terminate at a considerable distance in front of the lid 7, which has two support pins 8, 9 projecting inwardly. Bushes 10 and 1 are attached to shafts 1 and 2.
1 is screwed on. The bush 10 of the shaft 1 is supported on the support pin 8 via a needle bearing, and the idle gear 3 is attached to the bush 1.
Similarly, it is freely rotatably supported on the needle bearing. In this way, the bushing 10 forms supporting surfaces for the support pin 8 and the idler gear 3, respectively, by means of a portion of its inner and outer surfaces. The bushing 11 holds the twin gearwheel 4 as a centering bushing, which twin gearwheel is supported on the support pin 9 via a needle bearing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view along the axis of the main parts of a spur gear transmission according to the invention.

[Explanation of symbols]

1, 2 Axis 3 Idle gear 4 Fixed gear 6 Case 7 Lid 8,9 Support pin 10,11 Bushiyu

Claims (1)

[Claims] [Claim 1] A device having at least two shafts holding idle gears and fixed gears that mesh with each other, and a case whose shaft ends are closed by a lid, in which the shafts (1, 2) are located in front of the lid (7). Finally, this lid has support pins (8, 9) projecting inward, and bushes (1, 1) are attached to the shafts (1, 2), respectively.
0, 11) are screwed to form on a portion of their inner and outer surfaces respectively a support surface for the idler gear (3) adjacent to the support pin (8) and the lid (7) or for centering. A twin gear (4) is held as a bushing (11), and this twin gear is coupled to a corresponding shaft (2) so as not to rotate relative to each other, and is also supported on a support pin (9). ，Spur gear transmission.