CA1210423A - Driveline for a track-laying vehicle - Google Patents
Driveline for a track-laying vehicleInfo
- Publication number
- CA1210423A CA1210423A CA000462936A CA462936A CA1210423A CA 1210423 A CA1210423 A CA 1210423A CA 000462936 A CA000462936 A CA 000462936A CA 462936 A CA462936 A CA 462936A CA 1210423 A CA1210423 A CA 1210423A
- Authority
- CA
- Canada
- Prior art keywords
- driveline
- output
- input
- drive
- summing
- 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
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- Transmission Devices (AREA)
Abstract
ABSTRACT
DRIVELINE FOR A TRACK-LAYING VEHICLE
A driveline for a track-laying vehicle such as a tank includes a propulsion transmission (200) and a steer transmission (100), both driven from the engine crankshaft (1), and both of the toroidal race-roilling traction type continuously-variable ratio transmissions. An arrangement of epicyclic gears (l2, 13,) and clutches (H, C1, C2) transmits drive from the propulsion variator (200) in four regimes to summing epicyclic gears (6, 7) associated with left-hand and right-hand tracks. Steering of the tracks is achieved by summing the drive, in the summing epicyclic gears (6, 7), from the steer variator (100).
DRIVELINE FOR A TRACK-LAYING VEHICLE
A driveline for a track-laying vehicle such as a tank includes a propulsion transmission (200) and a steer transmission (100), both driven from the engine crankshaft (1), and both of the toroidal race-roilling traction type continuously-variable ratio transmissions. An arrangement of epicyclic gears (l2, 13,) and clutches (H, C1, C2) transmits drive from the propulsion variator (200) in four regimes to summing epicyclic gears (6, 7) associated with left-hand and right-hand tracks. Steering of the tracks is achieved by summing the drive, in the summing epicyclic gears (6, 7), from the steer variator (100).
Description
~Z~2~
DRIVELINE FOR A TRACK-LAYING VEHlCLE X1548 . . . ~
This invention relates to a drive line for a track-}aying vehicle such as a tank. It is an object of the invention to provide a drive line capable of efficient power transfer between left-hand and 5 right-hand track drive shafts, and stepless gear - ratio changes Eor steering.
The invention consists in a driveline for a track-laying vehicle, comprising first and second track drive shafts, a drive transmission adapted to be driven by the vehicle engine, first and second summing epicyclic gears each with a first input ~: - driven by the said drive transmlssion and an output driving a respective track drive shaft, a . ~ continuously-variable ~ratlo: steering transmission with an. input adapted to be driven by the engine, and a third summing epicycllc gear having a first input adapted to be driven~by the engine, a second input connected to an output of the contlnuously-variable ratio steering transmission, and an output driving a ~ second input to the first summing epicyclic gear via : : suitable gearing, the said output of the continuously-variable ratio steering transmission also driving a second input to the second summing epicyclic gear.
Moreover, the preferred driveline includes a cross-sha~t driven by the drive transmission and common to both flrst inputs of the first and second summing epicyclic gears. The first, second and third summing epicyclic gears are advantageously simple epicyclic gears. - -In order that the invention may be better understood,the drive line for a tank will now be described, with - reference to the accompanying drawings, of which:-10 Figure 1 is a schematic diagram of the drivelineembodying the invention, and Figure Z is a diagram of a driveline in accordance with the preferred embodiment, the driveline .
: including a steering and a drive transmission each continuously-varlable and of the toroidal : race-rolling traction type.
: :: :
Referring fixs~ to Figure 1, drlve I from the engine of a tank is geared to the inputs both o a continuously-variable ratio steering transmission K
and a summing epicyclic gear J. The engine also supplies drive I' to summing epicyclic gears L, M
...
which output drive to respective track drive shafts.
One output of the ~ear J is geared (N) at a suitable ratio to a further input of the summing epicyclic gear L, while another output of gear J is coupled to the output of the steering transmission K which drives, through suitable gearing P, a further input of the summing epicyclic gear M.
For straight drive, that is without a steering bias, the stee~ring transmission K is set so that the inputs 1~0 from respective gearing N, P to the two epicyclic gears L, M are equal. A steering bias is effected by ~ chang1ng the ratio of the steering transmission K in - either direction. ~The continuously-variable ratio transmission~K~is preferably designed, together with the ratios at N, P and J, to have an equal range of ratios at either side of the neutral steering point.
~ . ' Referring now to Figure 2, which shows one example of the driveline of Figure 1, drive from the crankshaft l of the engine of a tank is geared both to a steer variator 100 and to a propulsion variator 200. In this example, both transmissions 100, 200 are the toroidal race-rolling traction type continuously-variable ratio transmission. Drive from the , ., , ..... .
propulsion variator 200 reaches the left-hand and right-hand track drive shafts 20, 30, by way of various epicyclic gears and clutches described in detail in British Patent App.lication No. 8322937.
Drive from the steer variator 100 is coupled to the propulsion dri~e by simple epicyclic ge3rs 6, 7, which steers the t~nk by altering the relative speeds of the tracks.
Drive from the engine cran~shaft 1 reaches the input shaft 10 of the propulsion variator 200 by ge~ring 2, 4. Drive from the input shaft 10 or the output shaft 11 of the propulsion variator 20 passes through an arrangement of epicyclic gears 12, 13, and clutches Hr Cl or C2, to a cross-sha.ft of which portions 18, 19 are connected respectively to the annuli 63, 73, of simple epicyclic gears 6, 7. The planet carrier 62,~ 72, of each simple epicyclic gear 6, 7, provides a propulsion drive output to the respective drive sha~t 30, 20.
The steer variator 100 receives its drive input from the engine crankshaft 1 by way of gearing 2, 3.
Gearing 3 is coupled to the input shaft of the steer varia.tor and also to the annulus 53 of a simple epicyclic gear 5. The output shaft 8 of the steer ~LZ1~4;23 variator is connected at one end through yearing 81, 82, to the sun gear 71 of the simple epicyclic ~ear 7 which supplies drive to dri~e shaft 20. The other end of constant speed shaft 8 of the steer variator is connected to the sun gear 51 of the simple epicyclic gear 5, of which the planet carrier 52 is connected to drive the sun gear ~1 of simple epicyclic gear 6 by way of gearing 54, 55. The simple epicyclic gear 5 causes the gears ~4 and 81 to rotate in opposite rotational senses. The change of ratio introduced by the simple epicyclic gear 5 is compensated for by suitably selecting the ratio of gearing 55 and 82; in this e~ample, gearing 55 - ~ provides a ratio of -2.86 (i.e. it reverses the rotational sense) and gearing 82 a ratio of 1Ø
Simple epicyclic gear 6 effectively sums the drive from the cross shaft (at 18) and from the steer variator via géaring 54,~ 55, to provide a steered output on drive shaft 30. $imilarly, simple epicyclic gear 7 sums the drive from the cross shaft (at 19) and gearing 81, 82, to provide a steered output on drive sha~t 20.
,i
DRIVELINE FOR A TRACK-LAYING VEHlCLE X1548 . . . ~
This invention relates to a drive line for a track-}aying vehicle such as a tank. It is an object of the invention to provide a drive line capable of efficient power transfer between left-hand and 5 right-hand track drive shafts, and stepless gear - ratio changes Eor steering.
The invention consists in a driveline for a track-laying vehicle, comprising first and second track drive shafts, a drive transmission adapted to be driven by the vehicle engine, first and second summing epicyclic gears each with a first input ~: - driven by the said drive transmlssion and an output driving a respective track drive shaft, a . ~ continuously-variable ~ratlo: steering transmission with an. input adapted to be driven by the engine, and a third summing epicycllc gear having a first input adapted to be driven~by the engine, a second input connected to an output of the contlnuously-variable ratio steering transmission, and an output driving a ~ second input to the first summing epicyclic gear via : : suitable gearing, the said output of the continuously-variable ratio steering transmission also driving a second input to the second summing epicyclic gear.
Moreover, the preferred driveline includes a cross-sha~t driven by the drive transmission and common to both flrst inputs of the first and second summing epicyclic gears. The first, second and third summing epicyclic gears are advantageously simple epicyclic gears. - -In order that the invention may be better understood,the drive line for a tank will now be described, with - reference to the accompanying drawings, of which:-10 Figure 1 is a schematic diagram of the drivelineembodying the invention, and Figure Z is a diagram of a driveline in accordance with the preferred embodiment, the driveline .
: including a steering and a drive transmission each continuously-varlable and of the toroidal : race-rolling traction type.
: :: :
Referring fixs~ to Figure 1, drlve I from the engine of a tank is geared to the inputs both o a continuously-variable ratio steering transmission K
and a summing epicyclic gear J. The engine also supplies drive I' to summing epicyclic gears L, M
...
which output drive to respective track drive shafts.
One output of the ~ear J is geared (N) at a suitable ratio to a further input of the summing epicyclic gear L, while another output of gear J is coupled to the output of the steering transmission K which drives, through suitable gearing P, a further input of the summing epicyclic gear M.
For straight drive, that is without a steering bias, the stee~ring transmission K is set so that the inputs 1~0 from respective gearing N, P to the two epicyclic gears L, M are equal. A steering bias is effected by ~ chang1ng the ratio of the steering transmission K in - either direction. ~The continuously-variable ratio transmission~K~is preferably designed, together with the ratios at N, P and J, to have an equal range of ratios at either side of the neutral steering point.
~ . ' Referring now to Figure 2, which shows one example of the driveline of Figure 1, drive from the crankshaft l of the engine of a tank is geared both to a steer variator 100 and to a propulsion variator 200. In this example, both transmissions 100, 200 are the toroidal race-rolling traction type continuously-variable ratio transmission. Drive from the , ., , ..... .
propulsion variator 200 reaches the left-hand and right-hand track drive shafts 20, 30, by way of various epicyclic gears and clutches described in detail in British Patent App.lication No. 8322937.
Drive from the steer variator 100 is coupled to the propulsion dri~e by simple epicyclic ge3rs 6, 7, which steers the t~nk by altering the relative speeds of the tracks.
Drive from the engine cran~shaft 1 reaches the input shaft 10 of the propulsion variator 200 by ge~ring 2, 4. Drive from the input shaft 10 or the output shaft 11 of the propulsion variator 20 passes through an arrangement of epicyclic gears 12, 13, and clutches Hr Cl or C2, to a cross-sha.ft of which portions 18, 19 are connected respectively to the annuli 63, 73, of simple epicyclic gears 6, 7. The planet carrier 62,~ 72, of each simple epicyclic gear 6, 7, provides a propulsion drive output to the respective drive sha~t 30, 20.
The steer variator 100 receives its drive input from the engine crankshaft 1 by way of gearing 2, 3.
Gearing 3 is coupled to the input shaft of the steer varia.tor and also to the annulus 53 of a simple epicyclic gear 5. The output shaft 8 of the steer ~LZ1~4;23 variator is connected at one end through yearing 81, 82, to the sun gear 71 of the simple epicyclic ~ear 7 which supplies drive to dri~e shaft 20. The other end of constant speed shaft 8 of the steer variator is connected to the sun gear 51 of the simple epicyclic gear 5, of which the planet carrier 52 is connected to drive the sun gear ~1 of simple epicyclic gear 6 by way of gearing 54, 55. The simple epicyclic gear 5 causes the gears ~4 and 81 to rotate in opposite rotational senses. The change of ratio introduced by the simple epicyclic gear 5 is compensated for by suitably selecting the ratio of gearing 55 and 82; in this e~ample, gearing 55 - ~ provides a ratio of -2.86 (i.e. it reverses the rotational sense) and gearing 82 a ratio of 1Ø
Simple epicyclic gear 6 effectively sums the drive from the cross shaft (at 18) and from the steer variator via géaring 54,~ 55, to provide a steered output on drive shaft 30. $imilarly, simple epicyclic gear 7 sums the drive from the cross shaft (at 19) and gearing 81, 82, to provide a steered output on drive sha~t 20.
,i
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A driveline for a track-laying vehicle, comprising first and second track drive shafts, a drive transmission adapted to be driven by the vehicle engine, first and second summing epicyclic gears each with a first input driven by the said drive transmission and an output driving a respective track drive shaft, a continuously-variable ratio steering transmission with an input adapted to be driven by the engine, and a third summing epicyclic gear having a first input adapted to be driven by the engine, a second input connected to an output of the continuously-variable ratio steering transmission, and an output driving a second input to the first summing epicyclic gear via suitable gearing, the said output of the continuously-variable ratio steering transmission also driving a second input to the second summing epicyclic gear.
2. A driveline in accordance with Claim 1, wherein the first input of each of the first and second summing epicyclic gears is driven by the drive transmission by way of a cross shaft common to both gears.
3. A driveline in accordance with Claim 2, wherein the first and second summing epicyclic gears are simple epicyclic gears of which the annulus and sun are inputs and the planet carrier is the output.
4. A driveline in accordance with any preceding claim, wherein the third summing epicyclic gear is a simple epicyclic gear, of which the annulus is the said first input and is integral with an input shaft of the continuously-variable ratio steering transmission, the sun gear is connected to the output shaft of the steering transmission, and the planet carrier is the output.
5. A driveline in accordance with any one of claim 1 to 3, wherein the output of the third summing epicyclic gear rotates in the opposite sense to the output of the continuously-variable ratio steering transmission but the said suitable gearing reverses the rotational sense of the drive so that the said second inputs to the first and second summing epicyclic gears rotate in the same rotational sense.
6. A driveline in accordance with Claim 3, wherein the drive transmission is a continuously- variable ratio transmission of the toroidal race-rolling traction type, driving the cross shaft by way of a system of transfer gears and/or clutches.
7. A driveline in accordance with Claim 1, 2 or 3, wherein the continuously-variable ratio steering transmission is of the toroidal race-rolling traction type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000462936A CA1210423A (en) | 1984-09-12 | 1984-09-12 | Driveline for a track-laying vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000462936A CA1210423A (en) | 1984-09-12 | 1984-09-12 | Driveline for a track-laying vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1210423A true CA1210423A (en) | 1986-08-26 |
Family
ID=4128696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000462936A Expired CA1210423A (en) | 1984-09-12 | 1984-09-12 | Driveline for a track-laying vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1210423A (en) |
-
1984
- 1984-09-12 CA CA000462936A patent/CA1210423A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |