Transmission arrangement

Patent metadata

Field	Value
Publication number	US-11739816-B2
Application number	US-202217719783-A
Country	US
Kind code	B2
Filing date	Apr 13, 2022
Priority date	Apr 16, 2021
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A transmission arrangement includes a transmission housing including a transmission housing wall assembly defining a transmission housing cavity enclosing at least a first and a second planetary gear set, wherein at least an external portion of each one of a first and second locking mechanisms of the planetary gear sets is located on one side of the transmission housing wall assembly and the transmission housing cavity is located on an opposite side of the transmission housing wall assembly.

First claim

The invention claimed is:

1. A transmission arrangement, comprising
a first planetary gear set comprising a first set of planetary members, the first set of planetary members comprising a first sun gear, a first ring gear and a first planet carrier carrying a first set of planet gears, the first set of planet gears being in meshing engagement with the first ring gear and the first sun gear,
a second planetary gear set comprising a second set of planetary members, the second set of planetary members comprising a second sun gear, a second ring gear and a second planet carrier carrying a second set of planet gears, the second set of planet gears being in meshing engagement with the second ring gear and the second sun gear, wherein a first member of the first set of planetary members is operatively connected to a first member of the second set of planetary members, and wherein a second member of the first set of planetary members is operatively connected to a second member of the second set of planetary members,
a transmission housing,
an input shaft connectable to a prime mover, the input shaft being operatively connected to the first sun gear,
an output shaft operatively connected to the first planet carrier, and
a gear selection arrangement comprising:
a first locking mechanism connected to one of the members of the first set of planetary members, the first locking mechanism being adapted to be controlled by a first fluid pressure conducted to the first locking mechanism such that:
for at least a first fluid pressure equal to zero overpressure, the first locking mechanism is adapted to assume a locked condition in which the one member of the first set of planetary members is locked to the transmission housing, and
a second locking mechanism connected to one of the members of the second set of planetary members, the second locking mechanism being adapted to be controlled by a second fluid pressure conducted to the second locking mechanism such that:
for at least a second fluid pressure equal to zero overpressure, the second locking mechanism is adapted to assume a locked condition in which the one member of the second set of planetary members is locked to the transmission housing,
wherein the transmission housing comprises a transmission housing wall assembly defining a transmission housing cavity enclosing at least the first and second planetary gear sets, wherein at least an external portion of each one of the first and second locking mechanisms is located on one side of the transmission housing wall assembly and the transmission housing cavity is located on an opposite side of the transmission housing wall assembly.

2. The transmission arrangement according to claim 1 , wherein the first locking mechanism is further adapted to assume a set of first locking mechanism non-locked conditions in which the one member of the first set of planetary members is allowed to rotate relative to the transmission housing, and wherein the second locking mechanism is further adapted to assume a set of second locking mechanism non-locked conditions in which the one member of the second set of planetary members is allowed to rotate relative to the transmission housing, whereby:
for a first fluid pressure equal to or higher than a first fluid pressure threshold, the first locking mechanism is adapted to assume a released condition in which the one member of the first set of planetary members is free to rotate relative to the transmission housing, the released condition forming part of the set of first locking mechanism non-locked conditions,
for at least one first intermediate pressure between zero overpressure and the first fluid pressure threshold, the first locking mechanism is adapted to assume a slipping condition in which a relative rotation is allowed but braking torque is applied between the transmission housing and the one member of the first set of planetary members, the slipping condition forming part of the set of first locking mechanism non-locked conditions,
for a second fluid pressure equal to or higher than a second fluid pressure threshold, the second locking mechanism is adapted to assume a released condition in which the one member of the second set of planetary members is free to rotate relative to the transmission housing, the released condition forming part of the set of second locking mechanism non-locked conditions, and
for at least one second intermediate pressure between zero overpressure and the second fluid pressure threshold, the second locking mechanism is adapted to assume a slipping condition in which a relative rotation is allowed but braking torque is applied between the transmission housing and the one member of the second set of planetary members, the slipping condition forming part of the set of second locking mechanism non-locked conditions.

3. The transmission arrangement according to claim 2 , wherein the gear selection arrangement is adapted to assume a first gear condition in which the first locking mechanism assumes the locked condition and in which the second locking mechanism assumes one of the set of second locking mechanism non-locked conditions.

4. The transmission arrangement according to claim 3 , wherein the second locking mechanism assumes the slipping condition in the first gear condition.

5. The transmission arrangement according to claim 2 , wherein the gear selection arrangement is adapted to assume a second gear condition in which the second locking mechanism assumes the locked condition and in which the first locking mechanism assumes one of the set of first locking mechanism non-locked conditions.

6. The transmission arrangement according to claim 5 , wherein the first locking mechanism assumes the slipping condition in the second gear condition.

7. The transmission arrangement according to claim 1 , wherein the gear selection arrangement is adapted to assume a locked condition in which the first locking mechanism assumes the locked condition and the second locking mechanism assumes the locked condition.

8. The transmission arrangement according to claim 1 , wherein the first locking mechanism comprises a first biasing member, preferably a first spring arrangement, adapted to bias the first locking mechanism so as to assume the locked condition and wherein the second locking mechanism comprises a second biasing member, preferably a second spring arrangement, adapted to bias the second locking mechanism so as to assume the locked condition.

9. The transmission arrangement according to claim 1 , wherein the first locking mechanism comprises a first brake disc and a first brake caliper and wherein the second locking mechanism comprises a second brake disc and a second brake caliper.

10. The transmission arrangement according to claim 9 , wherein the external portion of the first locking mechanism comprises the first brake disc and the first brake caliper and wherein the external portion of the second locking mechanism comprises the second brake disc and the second brake caliper.

11. The transmission arrangement according to claim 1 , wherein the transmission housing cavity comprises a transmission lubrication liquid, wherein at least the external portion of each one of the first and second locking mechanisms is adapted to be in non-contact with the transmission lubrication liquid.

12. The transmission arrangement according to claim 1 , wherein the first locking mechanism is connected to the first ring gear.

13. The transmission arrangement according to claim 1 , wherein the second locking mechanism is connected to the second ring gear.

14. The transmission arrangement according to claim 1 , wherein t

Assignees

• Volvo Constr Equip Ab

Inventors

• Mattsson Per
• Lehikoinen Mathias

Classifications

• F16H3/64 Primary

  composed of a number of gear trains, the drive always passing through all the trains, each train having not more than one connection for driving another train · CPC title

• F16H2200/2007

  with two sets of orbital gears · CPC title

• F16H2200/2035

  with two engaging means · CPC title

• F16H47/00 Primary

  Combinations of mechanical gearing with fluid clutches or fluid gearing · CPC title

• F16H63/3026 Primary

  comprising friction clutches or brakes (band brake actuating mechanisms F16H63/3003) · CPC title