Power takeoff drive system for a vehicle

Patent metadata

Field	Value
Publication number	US-9434252-B2
Application number	US-201314438848-A
Country	US
Kind code	B2
Filing date	Nov 5, 2013
Priority date	Dec 21, 2012
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A system for transmitting power from an engine shaft to a power take-off (PTO) shaft of a utility vehicle, comprising a transmission having an input shaft coupled to the engine shaft and an output driveably connectable to one or more driven axles of the vehicle. A synchronised shift device is operable to selectively connect an output shaft thereof to one of the transmission input shaft and output, said output shaft further being driveably connectable to the PTO shaft. The synchronised shift device comprises inner and outer coaxially aligned and respectively rotatable input bodies alternately connectable to the shift device output shaft, with the inner input body connected to the transmission input shaft and the outer input body driveably connected to the transmission output. The arrangement provides switching between engine speed and ground speed operation of the PTO.

First claim

The invention claimed is:

1. A system for transmitting power from an engine shaft to a PTO shaft of a utility vehicle, comprising:
a transmission having an input shaft coupled to the engine shaft and an output body driveably connectable to one or more driven axles of the vehicle;
a synchronised shift device operable to selectively connect an output shaft thereof to one of the transmission input shaft and output body, said output shaft further being driveably connectable to the PTO shaft;
wherein the synchronised shift device comprises inner and outer coaxially aligned and respectively rotatable input bodies alternately connectable to the shift device output shaft, with the inner input body connected to the transmission input shaft and the outer input body driveably connected to the transmission output body, and wherein the synchronised shift device comprises:
a. the inner input body;
b. a first annular drive body coaxially and fixedly mounted on the inner input body and having a plurality of teeth on a radial outer surface thereof;
c. a synchronisation body rotatably mounted on the inner input body adjacent the first annular body;
d. a first annular coupling element rotatably mounted relative to the first annular drive body and driveably engageable therewith, said coupling element having a plurality of teeth on a radial outer surface thereof;
e. a synchronisation sleeve disposed about the first annular drive body, synchronisation body and first annular coupling element, the sleeve having teeth on an inner surface thereof and being slidable in an axial direction of the inner input body from a first disengaged position, through an intermediate position wherein the teeth of the sleeve engage the teeth of the first annular coupling element and thereby drive engagement of the first annular coupling element and first annular drive body, to an engaged position wherein the teeth of the sleeve engage the teeth of the drive body; and
f. the output shaft having external gearing over a part of the length thereof, said external gearing being in driving engagement with gearing on a part of the inner surface of the synchronisation sleeve in all positions of the synchronisation sleeve.

2. A system as claimed in claim 1 , wherein the synchronised shift device further comprises:
a. the outer input body coaxially and rotatably disposed about the inner input body;
b. a second annular drive body coaxially and fixedly mounted on the outer input body adjacent the synchronisation body and having a plurality of teeth on a radial outer surface thereof;
c. a second annular coupling element rotatably mounted relative to the second annular drive body and driveably engageable therewith, said second annular coupling element having a plurality of teeth on a radial outer surface thereof;
wherein the synchronisation sleeve is slidable through a second intermediate position wherein the teeth of the sleeve engage the teeth of the second annular coupling element and thereby drive engagement of the second annular coupling element and second annular drive body, to a second engaged position wherein the teeth of the sleeve engage the teeth of the second annular drive body.

3. A system as claimed in claim 1 , wherein the engagement of annular drive body and annular coupling element is through respective friction surfaces.

4. A system as claimed in claim 1 , wherein the synchronised shift device inner input body is axially aligned with, and directly connected to, the transmission input shaft.

5. A system as claimed in claim 1 , wherein the synchronised shift device outer input body is coupled to the transmission output body by a gear output shaft.

6. A system as claimed in claim 1 , wherein the synchronised shift device output shaft is driveably connectable to the PTO shaft through a clutch mechanism.

7. A system as claimed in claim 6 , wherein the clutch mechanism is a torque-limiting clutch mechanism.

8. A system as claimed in claim 6 , wherein the clutch mechanism is a friction clutch mechanism.

Assignees

• Agco Int Gmbh

Inventors

• Heindl Richard

Classifications

• B60Y2400/422

  Synchromesh type clutches or brakes · CPC title

• B60K17/28 Primary

  characterised by arrangement, location, or type of power take-off · CPC title

• B60K25/02

  directly from an engine shaft · CPC title

• B60Y2200/221

  Tractors · CPC title

• B60K25/00 Primary

  Auxiliary drives (arrangement of tyre-inflating pumps mounted on vehicles B60C23/10) · CPC title