Transmission and method for producing a transmission having a housing

Patent metadata

Field	Value
Publication number	US-11268609-B2
Application number	US-201816628826-A
Country	US
Kind code	B2
Filing date	Jun 13, 2018
Priority date	Jul 6, 2017
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A transmission includes a housing, having lower and upper housing parts, and having bearing seats. A web is formed on the lower housing part between two bearing seats in each case, which is pressed against a web provided on the upper housing part and between the respective bearing seats. The housing parts have an elastic distortion or deformation such that when the two housing parts are separated or pulled apart, or in other words, in an elastic relaxation, in particular, a first web of the webs of a first of the two housing parts projects beyond a planar surface, in particular beyond a separating surface, which restricts the other webs of the first housing part, or the webs of one of the housing parts is restricted by a planar separating surface, and with the exception of a first web, the webs of the other housing part are also restricted by the planar separating surface and the first web projects beyond the separating surface when the housing parts are separated from each other so that in order to form the housing of interconnected housing parts, at least one of the housing parts is elastically deformed and/or preloaded.

First claim

The invention claimed is:

1. A transmission, comprising:
a housing including a lower housing part and an upper housing part, the lower housing part including bearing seats and a web arranged between two respective bearing seats of the lower housing part, the upper housing part including bearing seats and a web arranged between two respective bearing seats of the upper housing part, the web of the lower housing part being pressed against the web of the upper housing part;
wherein (a) the lower housing part and the upper housing part are elastically distortable and/or elastically deformable such that when the two housing parts are separated, pulled apart, and/or in an elastic relaxation, at least one of the webs of the two housing parts projects beyond a planar surface and/or a separating surface of the respective housing part and/or (b) webs of a first one of the housing parts are restricted by a planar separating surface and with the exception of a first web, webs of a second one of the housing parts are also restricted by the planar separating surface, and the first web projects beyond the separating surface when the housing parts are separated from each other, so that in order to form the housing of interconnected housing parts, at least one of the housing parts is elastically deformed and/or preloaded.

2. The transmission according to claim 1 , wherein the housing consists of the lower housing part and the upper housing part.

3. The transmission according to claim 1 , wherein the first web is arranged between the bearing seat for a bearing of an input shaft and a bearing seat for a bearing of a first intermediate shaft.

4. The transmission according to claim 1 , wherein, with the exception of the first web and the web contacting the first web, all webs include a recess adapted to accommodate a pin.

5. The transmission according to claim 1 , wherein the bearing seats are arranged as bearing bores.

6. The transmission according to claim 5 , wherein bore axes of the bearing bores are aligned parallel to each other.

7. The transmission according to claim 5 , wherein bore axes of the bearing bores are arranged in a plane.

8. The transmission according to claim 1 , wherein no recess for accommodating a pin and/or a screw or a plurality of screws is provided in the first web.

9. The transmission according to claim 1 , wherein all of the webs, except the first web and a second web of the second one of the housing parts contacting the first web, include a recess adapted to accommodate a pin and at least one recess adapted to accommodate a screw.

10. The transmission according to claim 9 , wherein the recesses are arranged as bores having bore axes aligned in a normal direction to the planar surface.

11. The transmission according to claim 1 , wherein the first web is narrower than the other webs of the first one of housing parts.

12. A method for producing a transmission, comprising:
machining, with the exception of a region provided for a first web, a planar separating surface on a first unfinished casting part to produce an upper housing part of a housing of the transmission, the region projecting through a plane that accommodates the planar separating surface, and machining a planar separating surface on a second unfinished casting part to produce a lower housing part of the housing of the transmission;
after the machining, forming recesses adapted to accommodate a respective pin and/or a respective screw outside the region into the lower and/or upper housing part;
after the forming, connecting (a) the lower and upper housing parts and/or (b) the first and the second unfinished casting parts with the aid of pins and/or screws;
after the connecting, producing bearing bores and at least one web in (a) the lower and upper housing parts and/or (b) the first and second unfinished casting parts;
after the producing, separating the lower housing part and the upper housing part;
after the separating, installing bearings, shafts, and/or and toothed wheels in the lower housing part; and
after the installing, placing the upper housing part on top of the lower housing part and connecting the upper housing part to the lower housing part.

13. The method according to claim 12 , wherein the machining includes milling.

14. The method according to claim 12 , wherein the recesses are formed by drilling.

15. The method according to claim 12 , wherein the separating includes removing the screws.

16. The method according to claim 12 , further comprising cleaning the lower and upper housing parts between the separating and the installing.

17. A method for producing the transmission recited in claim 1 , comprising:
machining, with the exception of a region provided for the first web, the planar separating surface on a first unfinished casting part to produce the upper housing part of the housing of the transmission, the region projecting through a plane that accommodates the planar separating surface, and machining the planar separating surface on a second unfinished casting part to produce the lower housing part of the housing of the transmission;
after the machining, forming recesses adapted to accommodate a respective pin and/or a respective screw outside the region into the lower and/or upper housing part;
after the forming, connecting (a) the lower and upper housing parts and/or (b) the first and the second unfinished casting parts with the aid of pins and/or screws;
after the connecting, producing the bearing bores and at least one web in (a) the lower and upper housing parts and/or (b) the first and second unfinished casting parts;
after the producing, separating the lower housing part and the upper housing part;
after the separating, installing bearings, shafts, and/or and toothed wheels in the lower housing part; and
after the installing, placing the upper housing part on top of the lower housing part and connecting the upper housing part to the lower housing part.

Assignees

• Sew Eurodrive Gmbh & Co

Inventors

• Lamaj Ermalt
• Müller Mathias
• Eller Peter
• Schwan Tobias

Classifications

• F16H57/021 Primary

  Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings · CPC title

• F16H2057/02008

  characterised by specific dividing lines or planes of the gear case · CPC title

• B21D53/88

  other parts for vehicles, e.g. cowlings, mudguards · CPC title

• F16H2057/02017

  characterised by special features related to the manufacturing of the gear case, e.g. special adaptations for casting · CPC title

• F16H57/029 Primary

  characterised by means for sealing the gearboxes, e.g. to improve airtightness · CPC title