|Publication number||USRE41285 E1|
|Application number||US 10/197,533|
|Publication date||Apr 27, 2010|
|Filing date||May 12, 1998|
|Priority date||Jul 18, 1997|
|Also published as||CN1234775A, DE69818960D1, DE69818960T2, DE69830011D1, DE69830011T2, DE69834962D1, DE69834962T2, EP0928253A1, EP0928253B1, EP1258381A2, EP1258381A3, EP1258381B1, EP1354747A2, EP1354747A3, EP1354747B1, US6090006, WO1999003699A1|
|Publication number||10197533, 197533, PCT/1998/865, PCT/SE/1998/000865, PCT/SE/1998/00865, PCT/SE/98/000865, PCT/SE/98/00865, PCT/SE1998/000865, PCT/SE1998/00865, PCT/SE1998000865, PCT/SE199800865, PCT/SE98/000865, PCT/SE98/00865, PCT/SE98000865, PCT/SE9800865, US RE41285 E1, US RE41285E1, US-E1-RE41285, USRE41285 E1, USRE41285E1|
|Original Assignee||Volvo Construction Equipment Ab|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (74), Non-Patent Citations (2), Referenced by (2), Classifications (33), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a planetary transmission for a vehicle, comprising a planet carrier, on which at least one planet wheel is mounted, a hub arranged for a vehicle wheel and connected to the planet carrier, a static housing which is connected to the vehicle and in which the hub is mounted, and a friction brake arranged at an outer periphery of the planet carrier and intended to brake the rotation of the planet carrier in relation to the static housing.
It is previously known to arrange a planetary transmission in conjunction with the wheel of a vehicle. The drive shaft of the vehicle is then provided with an inner sun wheel for the planetary transmission, and a static housing surrounding the planetary transmission is provided with an outer gear ring. The sun wheel and the gear ring interact with planet wheels which are arranged on a planet carrier. The planet carrier is connected to a hub which is mounted in the static housing, and a vehicle wheel can be mounted on the hub by means of wheel bolts. By arranging a planetary transmission in conjunction with the wheel of a vehicle, an increase in torque from the drive shaft to the wheel is obtained. In order to brake the vehicle, friction discs are arranged on the periphery of the planet carrier, which interact with disc plates which are arranged in the static housing.
The construction of the known planetary transmission is such that it is not suitable for large and heavy vehicles, such as industrial machinery, which would require, for example, a stronger hub bearing arrangement and thus a longer hub in the axial direction. This would, however, place greater demands on the connection between the planet carrier and the hub, at the same time as it is desirable to keep the planetary transmission as a whole as compact as possible.
The object of the present invention is to produce a planetary transmission of the type indicated in the introduction, which eliminates the problems indicated above and aims to obtain as compact a construction as possible.
A further object of the invention is to produce a planetary transmission which comprises relatively few components and is easy and inexpensive to manufacture.
According to the invention, this is achieved by virtue of the fact that the hub and the planet carrier are interconnected by means of a first splined connection.
According to the invention, this is also achieved by virtue of the fact that an outer gear ring is arranged so as to interact with the at least one planet wheel and that the outer gear ring is connected to the static housing by means of a second splined connection.
Such a planetary transmission is compact and comprises fewer components than the known planetary transmission in spite of the fact that the planetary transmission is dimensioned so as to absorb considerably greater forces than the known construction.
The invention will be described in greater detail below with reference to the appended drawing which shows two exemplary embodiments and in which:
The term vehicle is intended to mean both vehicles which are intended to be driven on the road and vehicles which are intended to be driven off-road, for example in the forest. Such vehicles may be dumpers, wheeled loaders, excavators or other industrial machinery.
The planet carrier 2 comprises a through-hole 12 which is provided with splines 14. The centre line 15 of the hole 12 coincides with the axis of rotation of the planet carrier 2. A tub 16, which at a first end 18 comprises a journal 20 with splines 21, is arranged in the hole 12 of the planet carrier 2 and is thus radially connected to the planet carrier 2. A plate 19 is connected to the hub 16 by means of screws 23 and ensures that the hub 16 is axially connected to the planet carrier 2. The hub 16 comprises at a second end 22 a fastening arrangement 24 for a wheel 25 for the vehicle.
The hub 16 is mounted by means of roller bearings 26 mi a static housing 28 which is connected to the vehicle. The hub 16 therefore rotates in relation to the housing 28. Arranged in the housing 28 is an outer gear ring 30 for the planetary transmission 1, which ring is intended to interact with the planet wheels 4 on the planet carrier 2. The gear ring 30 is connected to a first pressure plate 32 for a friction brake 34 which will be described below.
The friction brake 34 comprises a set of friction discs 36 which are arranged on the periphery of the planet carrier 2. According to the first exemplary embodiment shown, the number of friction discs 36 is eight, but an arbitrary number of friction discs 36 is possible. The friction discs 36 are axially displaceable on splines 38 which are arranged on the periphery of the planet carrier 2. The friction discs 36 are locked on the planet carrier 2 in the circumferential direction.
A set of disc plates 40 is arranged on splines 42 in the housing 28. The disc plates 40 are axially displaceable but locked in the circumferential direction relative to the housing 28. The number of disc plates 40 is preferably the same as the number of friction discs 36. Alternatively, the disc plates 40 may be arranged on the periphery of the planet career 2 and the friction discs 36 may be arranged in the housing 28. The disc plates may be made of for example metal, plastic or carbon fibre. It is also possible to use other materials.
A second pressure plate 44 is arranged so as to compress the friction discs 36 and the disc plates 40 against the first pressure plate 32 when the rotation of the planet carrier 2 and thus the movement of the vehicle are to be braked. The second pressure plate 44 can be displaced axially by a number of hydraulic pistons 46 which are distributed along the second pressure plate 44. The hydraulic pistons 46 displace the second pressure plate 44 axially by means of hydraulic fluid under pressure acting on the hydraulic pistons 46. The hydraulic fluid is contained in an annular duct 48 arranged in the housing 28. The hydraulic fluid is supplied to the annular duct 48 through a mouthpiece 50 and a bore 51 in the housing 28. One or more helical springs 49, which are arranged between the first and second pressure plates 32 and 44 respectively, return the hydraulic piston 46 to an initial position after braking.
The first and second pressure plates 32 and 44 respectively and also the fiction discs 36 and the disc plates 40 are preferably annular but they may also be arranged in segments in a circular shape around the centre line 15 of the planet carrier 2.
According the first exemplary embodiment in
As an alternative, a sensor 68 may also be arranged in the housing 18, which senses the speed of rotation of the planet carrier 2 and thus also the speed of the vehicle. The sensor 68 is suitably arranged in a hole 70 in the housing 28 at the first pressure plate 32 and is directed towards the splines 38 on the periphery of the planet carrier 2, on which splines the first friction discs 36 are arranged The sensor 68 then senses how fast the bars of the splines 38 pass the sensor 68, which is proportional to the speed of rotation of the planet carrier 2. In order to increase the accuracy of the sensing of the sensor 68, the planet carrier 2 may alternatively be provided with teeth or splines with a finer pitch next to the splines 38 on which the first friction discs 36 are arranged.
The gear ring 30′ forms a first pressure plate 32′ for the friction discs 36 and the disc plates 40 which form the friction brake 34. The friction brake 34 preferably operates in a fluid which is made to circulate through a cooling device (not shown) by means of a pipe 72.
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|1||John Deere drawings, 3 sheets.|
|2||Volvo, Planetary Gear, drawings, 1 sheet.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8083634 *||Jun 27, 2005||Dec 27, 2011||Volvo Construction Equipment Ab||Disk brake, planet transmission, drive device and work vehicle|
|US20110098150 *||Jun 27, 2005||Apr 28, 2011||Volvo Construction Equipment Holding Sweden Ab||Disk brake, planet transmission, drive device and work vehicle|
|U.S. Classification||475/323, 188/264.0AA, 74/391, 188/71.5, 192/221.1, 180/372|
|International Classification||B60K17/04, F16H1/28, B60T1/06, F16H57/10, F16D65/14, F16D55/40, F16H3/54|
|Cooperative Classification||F16D65/72, Y10T74/19545, B60K17/046, B60T1/062, F16D65/54, F16H3/54, F16H1/28, F16D55/40, F16H57/10, F16D2055/0058, F16D2121/02, B60T1/065|
|European Classification||F16D65/72, F16H3/54, B60K17/04B1, B60T1/06B, B60T1/06C, F16D65/54, F16H57/10, F16D55/40|
|Jan 21, 2010||AS||Assignment|
Owner name: VOLVO CONSTRUCTION EQUIPMENT AB,SWEDEN
Free format text: MERGER;ASSIGNOR:VOLVO CONSTRUCTION EQUIPMENT COMPONENTS AB;REEL/FRAME:023827/0568
Effective date: 20060102
|Dec 21, 2011||FPAY||Fee payment|
Year of fee payment: 12