CA1077747A - Shaft mounted speed reducer housing - Google Patents
Shaft mounted speed reducer housingInfo
- Publication number
- CA1077747A CA1077747A CA281,415A CA281415A CA1077747A CA 1077747 A CA1077747 A CA 1077747A CA 281415 A CA281415 A CA 281415A CA 1077747 A CA1077747 A CA 1077747A
- Authority
- CA
- Canada
- Prior art keywords
- housing
- centerline
- bosses
- speed reducer
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- General Details Of Gearings (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A housing for a shaft mounted speed reducer consists of two identical housing halves secured together in facing relationship. Each housing half comprises a thin walled aluminum shell having a centerline, and each has a plurality of bosses in symmetrical array about the centerline. The bosses have cavities in the form of bores or blind holes to receive shaft-receiving bearings of the reducer. The cavities in the bosses leave strengthening rims around the cavities which are connected to a perimeter flange by webs on the shell. The peri-meter flange is symmetrical about the centerline and has symmetrically arranged enlarged portions, or nodes. Bores are formed in the enlarged flange portions to receive fastening members which hold the housing halves together in facing relation with the respective centerlines lying in a common plane. The housing can accommodate either single or double speed reduction mechanism.
-1a-
A housing for a shaft mounted speed reducer consists of two identical housing halves secured together in facing relationship. Each housing half comprises a thin walled aluminum shell having a centerline, and each has a plurality of bosses in symmetrical array about the centerline. The bosses have cavities in the form of bores or blind holes to receive shaft-receiving bearings of the reducer. The cavities in the bosses leave strengthening rims around the cavities which are connected to a perimeter flange by webs on the shell. The peri-meter flange is symmetrical about the centerline and has symmetrically arranged enlarged portions, or nodes. Bores are formed in the enlarged flange portions to receive fastening members which hold the housing halves together in facing relation with the respective centerlines lying in a common plane. The housing can accommodate either single or double speed reduction mechanism.
-1a-
Description
~7'77~7 BACKGROUND OF THE INVENTION
Field of the Invention This application relates to housings for shaft mounted speed reducers, and, more particularly, to housings made from identical housing halves.
Description of the Prior Art It has heretofore been recognized (as shown, for example, in the United States patent to Polzin 3,348,430) that identical housing halves can be used for speed reducers, and, more particularly, for speed reducers mounted directly on the shaft of driven mechanism, such as a machine. It is convenient to provide reducers for this type of installation which can, if desired, be converted from a single reduction unit to a double reduction unit.
Polzin, United States patent No. 3,348,~30, shows such a housing made of identical halves that are bolted to-gether at coupling flanges located centrally of the housing.
Since the housing is mounted on a rotatable output sha~t, it must be anchored by a torque reaction arm to an adja-cent support to prevent the housing from rotatin~ upon the output shaft. The torque arm is attached to the housing by the bolts that join the coupling flanges together, and the housing is subjected to a torque reaction at leas-t equal to the tor~ue appliad to the output shaft. Such housings must have tubular portions that extend between the end walls and the coupling flanges to enclose the speed reducer mechanism. When these tubular portions are thin and they are subjected to torsion, high torsional shear stresses are likely to result in the tubular portions.
Thus, unique problems are presented in the design of a -`~.? ~
777~7 shaft mounted speed reducer.
SUMM~RY OF THE INVENTION
Accordin~ to the present invention there is pro-vided a shaft mounted speed reducer housing in the form o~
a thin walled shell having a centerline, said housing com-prisiny two identical halves joined at a parting plane, each half symmetrical about the centerline, each half having an outer surface, an inner surface, three bosses projecting laterally from the inner surface, said bosses having circular cavities therein extending laterally of the inner surface, a perimeter flange projecting laterally from the inner sur-face to the parting plane, said parting plane extending per-pendicular to the perimeter flange, a plurality of enlarged portions on the perimete~ flang~,a plurality of webs pro-jectiny laterally from the inner surface and extending ra-dially between the bosses and the enlarged portions on the perimeter flange,said enlarged portions ha~ing bores there-through extending in the direction that the ~lange projects, and fastening members extending the entire length of both laterall~ projecting perimeter flanges through the respective bores of reversed housing halves to locations beyond the outer surfaces thereof to secure said housing halves together.
BRIEF D~SCRIPTION OF T~E DR~WINGS
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention - ~, ; ^
~igure 1 is an elevation view of the outside of a housi.ng half o:~ the present inventi onO
Figure 2 is a v;.ew showing the ins ide o -the `'~ housing ha:Lf o:E Figure 1.
- ~igure 3 is a side roll-out vi.ew taken along the line 3-3 of Figure 1" o~ a housirlg made from t~o housing halve~ constructed as the housing half of Figures 1 and 20 connectea together in facing relationship, with gear - reduciny me::hanism conkained therein Figure 4 i~ an elevation view of the reducer, with parts broken away to show the gear reducing mechanism iEor a double reduction.
Figure S i~ a view s.Lmilar to Figure 4 e~cept ~`howing a single reduction geax mechanism~
Figure 6 is a side view of the gear reduc~x apparatus o~ the present invention as mounted on ~he shaft ,~
. of a machine. -Figure 7 i~ a view taken as the view of Figure 1 ~howiny a modified housing ~alf~
~20 DESCRIPTIO~ OF q~ PREFE~RED E~IBOD~
q~here is shown in Figure 6" a machine 10 ha~ring a shaft 12 journaled in, and extending through, a pil~ow block bearing 14 mounted on a standard 16. A drive system 18 is mounted outside the trough ~o drive ~he machine shaft The drive system includes a motor 22 mounted on a bracket 24. The bracket 24 mayO in some irlsl~allations, be mounted direct1y to the speed reducerO In ~he insta3.1;a-- tion shown in Figure 69 the speed reaucer 260 which is mouIIted on machine shaft 12 9 supports the ~racke t ~4 and motor 22. A belt 13 connects a pulley 15 on the shaft of motor 22 to a pulley 17 on the input shaft :L9 of the speed reducer 26. It is therefore important that the speed reducer be strong and rigid enough to convey the power required to drive the machine, but yet be light enough for support by the machine shaft 12 and the shaft bearing 14.
The speed reducer housing of the present inven-tion is light but strong, while, at the same time, afford-ing the economy of manufacture inherent in the use of identical housing halves.
The housing half 28, which, together with an identical housing half, is utilized to form the housing 30, is shown in Figures 1 and 2. The housing half 28, which is cast, is made of aluminum. The housing in its cast form has a centerline 32, and has a plurality of bosses 34, 36 and 38. ~ach boss has a center 34a, 36a and 38a, respectively. The center 34a of boss 34 lies on the centerline 32, and the centers 36a, 38a of bosses 36, 38 lie an equal distance M from the centerline 32. The centers 36a, 38a also lie an e~ual distance N from the center 34a of boss 34. ~hus the centers 34a, 36a and 38a form an isosceles triangle 40 with centerline 32 constitu-ting a perpendicular bisector of the base (imaginery line between centers 36a ~nd 38a) and passing through the apex (center 34a).
Each boss 34, 36 and 38 has a cavity 34b, 36b and 38b, respectively, therein. The cavities 34b and 38b are in the ~orm of bores extending completely through the bosses 34, 38 respectively. The cavit~ 36b, however, is ~, . ............................................................... .
. .
.
7774~
in the form of a blind hole which is open on the inner surface 42 of the housing half 28 but not on the outer surface 44 thereof.
The housing half 28 has nine sides, Sl to S9 inclusive, which join at junctions J12, J23, J34, ~45, J56, J67, J78, J89, and J91, respectively. The sides and junctions of the housing half are symmetrical about the centerline 32. A flange 46, which is also symmetrical .-about the centerline, is formed on surface 42 at the peri-meter of the housing half. Nodes 48 are formed at the junctions J12 to J91 inclusive, and each node has a bore 50 extending therethrough. The flange 46, nodes 48 and bores 50 are symmetrical about the centerline 32.
Webs 51 are formed on the surface 42 and extend between each node 48 and one of the bosses. The webs serve to strengthen the housing halves~
Two identical housing halves 28 are joined in facing relationship (that is, with surfaces 4~ of the respective halves 28 facing each other) to form a housing 30 for the speed reducing mechanism, indicated generally at 52. The housing halves are assembled with the center-lines 32 of the respective halves falling in a common plane. Bolts 54a (received in node bores 50) and nuts 54b hold the housing halves together.
Figure 3 shows two housing halves joined in facing relationship~ For purposes of bett~r illustrating the relationship of the housing halves, and the receipt of the reducer mechanism therein, Figure 3 shows the reducer stretched, or rolled out, in the viewing plane along the line 3-3 of Figure 1.
7~779L7 ..
The centers 34a, 34a of bosses 34, 34 of the ~wo facing housing halves, respectively, lie on a cvmmon axis 56; the centers 36a~ 38a of bosses 36, 38 of the faclng housing halves~ respectively~ lie on a common axis 58; and the centers 3~a, 36a of bosses 38, 36 o~ the facing housing halves respeckively lîe on a cor~mon axis 60.
The cavity 34b is formed in boss 34 in centered relation to the cen~ex 34a thereof, the cavity 36~ i9 formed in boss 36 in centered relation to the ce~ter 36a thereof: and ~he cavity 38b is formed in boss 38 .in centered relation to the center 38a t~ereofO Each boss, and the cavit~ ther~in, are circular in cross-secti.on3 and the diameter o~ each cavity is less than the diameter o the boss to form a ~trengthening rlm (34c~, 36c, 38c, respec tively) around the cavity. The walls of cavities ~4b and - 36~ are stepped to form a shoulder 34d and 36d~ The cavitLes 34b, 38b extend complekely through the wall o~
the hou~ing half to define bores, The ca~ity 36 opens on surface 4~ but do~s not extend all the way through ~he hou~ing half 28 to surface 44, thereby definîng a blind hole.
B~arings 34f and 36f are xeceived in cavitles 34bD 36b, against the shoulders 34d, 36d~ Bearings 38f ar~ received in cavity 38b and located thereLn with snap rings 620 ~he input shaft 19 is received in bearings 38f and 36f on axi~ 60, and a sleeve 65 (which receives output shat 12) is received in bearings 34f on axis 56~ For ~ingle speed reduc-tion operationp as shown in Figure 5, neither bearings nor a shaft are ut.ilized on axis 58. A
113777~7 gear 67 on the output shaft sleevP 65 meshes wi~h a gear 69 on output shaft 12 for the single desired speed reduction ~`or dou~le spead reduction operation, as shown in Figures 3 and 4, an intermediate ~haft 68 is mounted in bearings 36f :and 38~ on axis 58. ~ cap 70 covers the bore opening in ~urface 44 of the housing half. Gear 71 of input shaft lg meshes with a gear 7~ on intermediate sha:Et 68~, and a gear 74 of the intermedia te shaft meshes with a gear 76 on output shaf~
~:n the e~odiment of the inventiorl disclosed in Figure 1, two of the cavities 34b nd 38b were in the fonn of bores~ wh.ile one 3~b of the c!avitie~ was :Ln the form o~
a blind hole r As shown in the hous ing half 128 of Figure ~, all of cavities 134b, 136~ and 138b can be in the form of bores. In all other respectsO the housing hal~ 128 is identica~ to the hous.ing half 280 W~en all of the cavities --a.re ~n the ~orm of bores (thus making the housing half ~metrical~ closures 70 (see Figure 3) are used at one or ~oth end~ ~ the bore if the shaft mounted in ~he bore ~0 does not eæt~nd outside the housing on either or both ~ides .
Although ~he best mode contemplated ~or caxr~ing ~ut the pre~ent invention has been herein shown and des-cribed, i~ will be apparent that modification and varia-ti~n may be made without departing ~rom what is regarded to be ~he subject matter of the invention~
JFV:cds
Field of the Invention This application relates to housings for shaft mounted speed reducers, and, more particularly, to housings made from identical housing halves.
Description of the Prior Art It has heretofore been recognized (as shown, for example, in the United States patent to Polzin 3,348,430) that identical housing halves can be used for speed reducers, and, more particularly, for speed reducers mounted directly on the shaft of driven mechanism, such as a machine. It is convenient to provide reducers for this type of installation which can, if desired, be converted from a single reduction unit to a double reduction unit.
Polzin, United States patent No. 3,348,~30, shows such a housing made of identical halves that are bolted to-gether at coupling flanges located centrally of the housing.
Since the housing is mounted on a rotatable output sha~t, it must be anchored by a torque reaction arm to an adja-cent support to prevent the housing from rotatin~ upon the output shaft. The torque arm is attached to the housing by the bolts that join the coupling flanges together, and the housing is subjected to a torque reaction at leas-t equal to the tor~ue appliad to the output shaft. Such housings must have tubular portions that extend between the end walls and the coupling flanges to enclose the speed reducer mechanism. When these tubular portions are thin and they are subjected to torsion, high torsional shear stresses are likely to result in the tubular portions.
Thus, unique problems are presented in the design of a -`~.? ~
777~7 shaft mounted speed reducer.
SUMM~RY OF THE INVENTION
Accordin~ to the present invention there is pro-vided a shaft mounted speed reducer housing in the form o~
a thin walled shell having a centerline, said housing com-prisiny two identical halves joined at a parting plane, each half symmetrical about the centerline, each half having an outer surface, an inner surface, three bosses projecting laterally from the inner surface, said bosses having circular cavities therein extending laterally of the inner surface, a perimeter flange projecting laterally from the inner sur-face to the parting plane, said parting plane extending per-pendicular to the perimeter flange, a plurality of enlarged portions on the perimete~ flang~,a plurality of webs pro-jectiny laterally from the inner surface and extending ra-dially between the bosses and the enlarged portions on the perimeter flange,said enlarged portions ha~ing bores there-through extending in the direction that the ~lange projects, and fastening members extending the entire length of both laterall~ projecting perimeter flanges through the respective bores of reversed housing halves to locations beyond the outer surfaces thereof to secure said housing halves together.
BRIEF D~SCRIPTION OF T~E DR~WINGS
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention - ~, ; ^
~igure 1 is an elevation view of the outside of a housi.ng half o:~ the present inventi onO
Figure 2 is a v;.ew showing the ins ide o -the `'~ housing ha:Lf o:E Figure 1.
- ~igure 3 is a side roll-out vi.ew taken along the line 3-3 of Figure 1" o~ a housirlg made from t~o housing halve~ constructed as the housing half of Figures 1 and 20 connectea together in facing relationship, with gear - reduciny me::hanism conkained therein Figure 4 i~ an elevation view of the reducer, with parts broken away to show the gear reducing mechanism iEor a double reduction.
Figure S i~ a view s.Lmilar to Figure 4 e~cept ~`howing a single reduction geax mechanism~
Figure 6 is a side view of the gear reduc~x apparatus o~ the present invention as mounted on ~he shaft ,~
. of a machine. -Figure 7 i~ a view taken as the view of Figure 1 ~howiny a modified housing ~alf~
~20 DESCRIPTIO~ OF q~ PREFE~RED E~IBOD~
q~here is shown in Figure 6" a machine 10 ha~ring a shaft 12 journaled in, and extending through, a pil~ow block bearing 14 mounted on a standard 16. A drive system 18 is mounted outside the trough ~o drive ~he machine shaft The drive system includes a motor 22 mounted on a bracket 24. The bracket 24 mayO in some irlsl~allations, be mounted direct1y to the speed reducerO In ~he insta3.1;a-- tion shown in Figure 69 the speed reaucer 260 which is mouIIted on machine shaft 12 9 supports the ~racke t ~4 and motor 22. A belt 13 connects a pulley 15 on the shaft of motor 22 to a pulley 17 on the input shaft :L9 of the speed reducer 26. It is therefore important that the speed reducer be strong and rigid enough to convey the power required to drive the machine, but yet be light enough for support by the machine shaft 12 and the shaft bearing 14.
The speed reducer housing of the present inven-tion is light but strong, while, at the same time, afford-ing the economy of manufacture inherent in the use of identical housing halves.
The housing half 28, which, together with an identical housing half, is utilized to form the housing 30, is shown in Figures 1 and 2. The housing half 28, which is cast, is made of aluminum. The housing in its cast form has a centerline 32, and has a plurality of bosses 34, 36 and 38. ~ach boss has a center 34a, 36a and 38a, respectively. The center 34a of boss 34 lies on the centerline 32, and the centers 36a, 38a of bosses 36, 38 lie an equal distance M from the centerline 32. The centers 36a, 38a also lie an e~ual distance N from the center 34a of boss 34. ~hus the centers 34a, 36a and 38a form an isosceles triangle 40 with centerline 32 constitu-ting a perpendicular bisector of the base (imaginery line between centers 36a ~nd 38a) and passing through the apex (center 34a).
Each boss 34, 36 and 38 has a cavity 34b, 36b and 38b, respectively, therein. The cavities 34b and 38b are in the ~orm of bores extending completely through the bosses 34, 38 respectively. The cavit~ 36b, however, is ~, . ............................................................... .
. .
.
7774~
in the form of a blind hole which is open on the inner surface 42 of the housing half 28 but not on the outer surface 44 thereof.
The housing half 28 has nine sides, Sl to S9 inclusive, which join at junctions J12, J23, J34, ~45, J56, J67, J78, J89, and J91, respectively. The sides and junctions of the housing half are symmetrical about the centerline 32. A flange 46, which is also symmetrical .-about the centerline, is formed on surface 42 at the peri-meter of the housing half. Nodes 48 are formed at the junctions J12 to J91 inclusive, and each node has a bore 50 extending therethrough. The flange 46, nodes 48 and bores 50 are symmetrical about the centerline 32.
Webs 51 are formed on the surface 42 and extend between each node 48 and one of the bosses. The webs serve to strengthen the housing halves~
Two identical housing halves 28 are joined in facing relationship (that is, with surfaces 4~ of the respective halves 28 facing each other) to form a housing 30 for the speed reducing mechanism, indicated generally at 52. The housing halves are assembled with the center-lines 32 of the respective halves falling in a common plane. Bolts 54a (received in node bores 50) and nuts 54b hold the housing halves together.
Figure 3 shows two housing halves joined in facing relationship~ For purposes of bett~r illustrating the relationship of the housing halves, and the receipt of the reducer mechanism therein, Figure 3 shows the reducer stretched, or rolled out, in the viewing plane along the line 3-3 of Figure 1.
7~779L7 ..
The centers 34a, 34a of bosses 34, 34 of the ~wo facing housing halves, respectively, lie on a cvmmon axis 56; the centers 36a~ 38a of bosses 36, 38 of the faclng housing halves~ respectively~ lie on a common axis 58; and the centers 3~a, 36a of bosses 38, 36 o~ the facing housing halves respeckively lîe on a cor~mon axis 60.
The cavity 34b is formed in boss 34 in centered relation to the cen~ex 34a thereof, the cavity 36~ i9 formed in boss 36 in centered relation to the ce~ter 36a thereof: and ~he cavity 38b is formed in boss 38 .in centered relation to the center 38a t~ereofO Each boss, and the cavit~ ther~in, are circular in cross-secti.on3 and the diameter o~ each cavity is less than the diameter o the boss to form a ~trengthening rlm (34c~, 36c, 38c, respec tively) around the cavity. The walls of cavities ~4b and - 36~ are stepped to form a shoulder 34d and 36d~ The cavitLes 34b, 38b extend complekely through the wall o~
the hou~ing half to define bores, The ca~ity 36 opens on surface 4~ but do~s not extend all the way through ~he hou~ing half 28 to surface 44, thereby definîng a blind hole.
B~arings 34f and 36f are xeceived in cavitles 34bD 36b, against the shoulders 34d, 36d~ Bearings 38f ar~ received in cavity 38b and located thereLn with snap rings 620 ~he input shaft 19 is received in bearings 38f and 36f on axi~ 60, and a sleeve 65 (which receives output shat 12) is received in bearings 34f on axis 56~ For ~ingle speed reduc-tion operationp as shown in Figure 5, neither bearings nor a shaft are ut.ilized on axis 58. A
113777~7 gear 67 on the output shaft sleevP 65 meshes wi~h a gear 69 on output shaft 12 for the single desired speed reduction ~`or dou~le spead reduction operation, as shown in Figures 3 and 4, an intermediate ~haft 68 is mounted in bearings 36f :and 38~ on axis 58. ~ cap 70 covers the bore opening in ~urface 44 of the housing half. Gear 71 of input shaft lg meshes with a gear 7~ on intermediate sha:Et 68~, and a gear 74 of the intermedia te shaft meshes with a gear 76 on output shaf~
~:n the e~odiment of the inventiorl disclosed in Figure 1, two of the cavities 34b nd 38b were in the fonn of bores~ wh.ile one 3~b of the c!avitie~ was :Ln the form o~
a blind hole r As shown in the hous ing half 128 of Figure ~, all of cavities 134b, 136~ and 138b can be in the form of bores. In all other respectsO the housing hal~ 128 is identica~ to the hous.ing half 280 W~en all of the cavities --a.re ~n the ~orm of bores (thus making the housing half ~metrical~ closures 70 (see Figure 3) are used at one or ~oth end~ ~ the bore if the shaft mounted in ~he bore ~0 does not eæt~nd outside the housing on either or both ~ides .
Although ~he best mode contemplated ~or caxr~ing ~ut the pre~ent invention has been herein shown and des-cribed, i~ will be apparent that modification and varia-ti~n may be made without departing ~rom what is regarded to be ~he subject matter of the invention~
JFV:cds
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A shaft mounted speed reducer housing in the form of a thin walled shell having a centerline, said hous-ing comprising two identical halves joined at a parting plane, each half symmetrical about the centerline, each half having an outer surface, an inner surface, three bosses projecting laterally from the inner surface, said bosses having circular cavities therein extending laterally of the inner surface, a perimeter flange projecting laterally from the inner surface to the parting plane, said parting plane extending perpendicular to the perimeter flange, a plurality of enlarged portions on the perimeter flange, a plurality of webs projecting laterally from the inner surface and extending radially between the bosses and the enlarged portions on the perimeter flange, said enlarged portions having bores therethrough extending in the direction that the flange projects, and fastening members extending the entire length of both laterally projecting perimeter flanges through the respective bores of reversed housing halves to locations beyond the outer surfaces thereof to secure said housing halves together.
2. A shaft mounted speed reducer housing as described in claim 1 wherein said fastening members include bolts with nuts threadedly fitted thereon.
3. A shaft mounted speed reducer housing as described in claim 1 wherein one of said bosses is aligned on a plane within which the centerline projects, a pair of said bosses straddle the centerline plane projecting lat-erally from the inner surface, each boss of said pair being equally spaced from said centerline plane and from said one boss aligned on said plane.
4. A shaft mounted speed reducer housing as described in claim 3 wherein said perimeter flange is formed by a multiplicity of chordal sides that are symmetrically arrayed about the centerline plane, said enlarged portions being located at the junctions of said chordal sides.
5. A shaft mounted speed reducer housing as described in claim 4 wherein said webs that extend radially between the bosses and the enlarged portions on the peri-meter flange are symmetrically arrayed about the centerline plane.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US70741176A | 1976-07-21 | 1976-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1077747A true CA1077747A (en) | 1980-05-20 |
Family
ID=24841592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA281,415A Expired CA1077747A (en) | 1976-07-21 | 1977-06-27 | Shaft mounted speed reducer housing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1077747A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013071380A1 (en) * | 2011-05-30 | 2013-05-23 | Renk Zanini S A Equipamentos Industriais | Improvement to speed reducing equipment with torque splitter, and casing thereof |
| CN109114204A (en) * | 2018-09-10 | 2019-01-01 | 奇瑞商用车（安徽）有限公司 | Commercial wheel side reducer shell |
-
1977
- 1977-06-27 CA CA281,415A patent/CA1077747A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013071380A1 (en) * | 2011-05-30 | 2013-05-23 | Renk Zanini S A Equipamentos Industriais | Improvement to speed reducing equipment with torque splitter, and casing thereof |
| US10167942B2 (en) | 2011-05-30 | 2019-01-01 | Renk Zanini S/A Equipamentos Industrials | Speed reducing equipment with torque splitter, and casing thereof |
| CN109114204A (en) * | 2018-09-10 | 2019-01-01 | 奇瑞商用车（安徽）有限公司 | Commercial wheel side reducer shell |
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| MKEX | Expiry |