US 8,616,078 B2Granted

Multistage transmission

AssigneeHonda Motor Co., Ltd.

InventorsShinya Matsumoto, Jun Miyazaki

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Abstract

A gear with an annular member disposed alongside a side wall of an inward protrusion in a manner turnable relative to the side wall. The annular member is formed with abutment projections with inclined surfaces extending in circumferential directions and engaged by engaging pawls. The annular member is urged by return springs in such a manner that the portion of each abutment projection, at least other than the inclined surfaces, overlaps each engaging projection as viewed in axial direction. Each inclined surface of the abutment projection is made up of a bottom-side inclined surface having an inclination angle allowing abutment by the engaging pawls, and a top-side inclined surface having an inclination angle not allowing abutment by the engaging pawls but causing sliding movement of the engaging pawls. The engaging pawls are prevented be imposed with excessive local load when the engaging pawls engage the engaging projections of the gear.

A multistage transmission in which a plurality of driving gears (m) and a plurality of driven gears (n) are supported on mutually parallel gear shafts in a constantly meshing state for every speed, one of the driving gears (m) and the driven gears (n) are fixed to one of the gear shaft, and engagement means is provided for each of the other gears, the engagement means being operative to cause an engaging projection (31) formed on an inside periphery of each of the other gears to engage a radially movable engaging member (R) provided on the other gear shaft (12) for each of the other gears, due to radially outward protrusion of the engaging member (R), in a manner to fix each of the other gears to the other gear shaft for speed shift:

wherein said engaging projection (31) is formed on an annular inward protrusion (30C) on the inside periphery of each of the other gears (n);
an annular plate member (35) is provided which is positioned close to, and turnably relative to a side surface of the inward protrusion (30C) having the engaging projection (31) of each of the other gears (n);
and
a return spring (38) is interposed between each of the other gears (n) and the annular plate member (35) to elastically maintain a predetermined relative position thereof;
and
wherein the annular plate member (35) is provided on an inside periphery thereof with an abutment projection (36) having inclined surfaces for abutment with the engaging member (R), said return spring (38) being operative to cause a portion of the abutment projection (36) at least other than the inclined surfaces to overlap the engaging projection (31) as viewed in an axial direction;
and
each of the inclined surfaces of the abutment projection (36) comprises a bottom-side inclined surface (36pb) having an inclination angle allowing engagement with the engaging member (R), and a top-side inclined surface (36ps) having an inclination angle which does not allow engagement with the engaging member (R) but allows sliding movement of the engaging member (R).

5 more elements

Abstract

Claims20