GB1495989A - Control system to apply vehicle brakes during a transmission directional shift - Google Patents
Control system to apply vehicle brakes during a transmission directional shiftInfo
- Publication number
- GB1495989A GB1495989A GB4842075A GB4842075A GB1495989A GB 1495989 A GB1495989 A GB 1495989A GB 4842075 A GB4842075 A GB 4842075A GB 4842075 A GB4842075 A GB 4842075A GB 1495989 A GB1495989 A GB 1495989A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- pressure
- fluid
- transmission
- responsive
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/103—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic in combination with other control devices
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
- Control Of Transmission Device (AREA)
- Motor Power Transmission Devices (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
- Gear-Shifting Mechanisms (AREA)
Abstract
1495989 Automatic application of brakes CATERPILLAR TRACTOR CO 25 Nov 1975 [9 April 1975] 48420/75 Heading F2F A brake control system for automatically applying the brakes of a heavy duty earth working vehicle when shifting between forward and reverse drive has a speed responsive control so that the brakes are only applied if the direction of drive is reversed above a predetermined speed. The vehicle has a transmission with hydraulically-operated forward and reverse clutches and hydraulically controlled brakes, and the system comprises an hydraulic pump 10, a forward-and-reverse selector valve 28, a pressure-responsive brake control mechanism responsive to fluid pressure for controlling braking, a pressure-controlling valve mechanism 31 responsive to a first pressure signal, generated on shifting valve 28, for controlling the flow of fluid from the source to the pressure-responsive brake control mechanism and a second valve mechanism 30, responsive to a second pressure signal related to a predetermined minimum output from the transmission, i.e. related to vehicle speed, for conducting the first signal to the pressure controlling valve mechanism. A direction sensing means 27 includes an annular container 26 mounted on the output shaft of the transmission and fluid therein impacts against the openings of respective pitot tubes 33, 34 depending on direction of rotation to build a pressure which acts as a control pressure on valve 30, the latter only acting if there is sufficient pressure from the transmission; that is, since the pressure is related to speed, if the vehicle is moving faster than a predetermined speed. When the valve spool 75 of valve 30 is biased to the left by a spring 82, pressurized fluid in line 76 is dumped to reservoir 11 but when the spool is moved to the right by pressure fluid in line 37 the fluid is communicated to the area 101 of valve 31 causing the spool 89 of the valve 31 to move to the left cutting off communication between the hydraulic lines 93 and 94. This allows the spring-biased brakes to operate. In a modification there is no speedsensing control and valve 30 receives a signal from the transmission control. In another modification an electrical generator is connected to the output of the transmission and provides a signal related to speed which controls the supply of fluid to valve 30 by means of a solenoid-operated valve.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56650175A | 1975-04-09 | 1975-04-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1495989A true GB1495989A (en) | 1977-12-21 |
Family
ID=24263156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4842075A Expired GB1495989A (en) | 1975-04-09 | 1975-11-25 | Control system to apply vehicle brakes during a transmission directional shift |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS51118224A (en) |
| CA (1) | CA1029776A (en) |
| GB (1) | GB1495989A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH085351B2 (en) * | 1984-01-09 | 1996-01-24 | 防衛庁技術研究本部長 | Stop control method for a vehicle equipped with a hydromechanical transmission / steering device |
| JPS6173441U (en) * | 1984-10-20 | 1986-05-19 | ||
| JPH0784903B2 (en) * | 1986-01-14 | 1995-09-13 | 株式会社クボタ | Work vehicle gear shift operation device |
| JPS62120029U (en) * | 1986-01-22 | 1987-07-30 |
-
1975
- 1975-11-25 GB GB4842075A patent/GB1495989A/en not_active Expired
- 1975-12-11 CA CA241,517A patent/CA1029776A/en not_active Expired
-
1976
- 1976-01-06 JP JP108076A patent/JPS51118224A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CA1029776A (en) | 1978-04-18 |
| JPS51118224A (en) | 1976-10-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |