Heavy duty planetary transmission

• US 3,319,491 A
• Filed: 12/24/1963
• Issued: 05/16/1967
• Est. Priority Date: 12/24/1963
• Status: Expired due to Term

• Current Assignee: Howard W. Simpson
• Original Assignee: Howard W. Simpson
• Inventors: Simpson, Howard W.
• Application Number:
  US04/333,094
• Time in Patent Office: 1,239 Days
• US Class Current: 475/280
• CPC Class Codes: F16H 2200/0069 the gear ratios comprising ten forward speeds
• CPC Class Codes: F16H 2200/201 with three sets of orbital gears
• CPC Class Codes: F16H 3/66 composed of a number of gear trains without drive passing from one train to another
• CPC Class Codes: F16H 59/045 consisting of fluid valves

Claims

1. A VARIABLE SPEED TRANSMISSION FOR A SELF-PROPELLED VEHICLE COMPRISING FIRST AND SECOND PLANETARY GEAR SETS, MEANS INCLUDING GEAR PROPORTIONS AND SELECTIVELY ENGAGABLE CLUTCH AND BRAKE CONNECTIONS FOR ESTABLISHING PROGRESSIVE FORWARD SPEED DRIVE RATIOS THROUGH SAID GEAR SETS INCLUDING A RELATIVELY LARGE RATIO STEP BETWEEN THE LOWEST AND SECOND SPEED RATIOS, A THIRD PLANETARY GEAR SET, MEANS INCLUDING GEAR PROPORTIONS AND SELECTIVELY ENGAGEABLE CLUTCH AND BRAKE CONNECTIONS FOR SAID THIRD PLANETARY GEAR SET FOR ALTERNATIVELY PROVIDING A LOW SPEED RANGE WHEREIN A FORWARD SPEED REDUCTION RATIO MAY BE COMBINED WITH THE SPEED RATIOS OBTAINED IN THE FIRST TWO PLANETARY SETS OR A HIGH RANGE DRIVE WHEREIN THE RATIOS ESTABLISHED IN THE FIRST TWO PLANETARY SETS ARE NOT MODIFIED BY THE THIRD PLANETARY SET, THE HIGHEST COMBINED SPEED RATIO OF SAID THREE PLANETARY SETS IN LOW SPEED RANGE EXCEEDING SAID LOWEST SPEED RATIO OF SAID FIRST AND SECOND PLANETARY SETS AND BEING LESS THAN ANOTHER SPEED RATIO OF SAID FIRST AND SECOND PLANETARY SETS BY A RELATIVELY SMALL RATIO STEP, AND MEANS FOR PRODUCING A PROGRESSIVE SEQUENCE OF RATIO STEPS THROUGH SAID LOW AND HIGH SPEED RANGES UTILIZING SAID LOWEST SPEED RATIO OF SAID FIRST TWO SETS ONLY IN SAID LOW SPEED RANGE THEREBY ELIMINATING SAID RELATIVELY LARGE RATIO STEP IN SAID HIGH SPEED RANGE.