12-speed gear box with a 2×3×2 construction

• US 6,318,211 B1
• Filed: 05/15/2000
• Issued: 11/20/2001
• Est. Priority Date: 11/29/1997
• Status: Expired due to Fees

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Schepperle, Bernd, Nitzschke, Rüdiger
• Primary Examiner(s): Marmor, Charles A
• Assistant Examiner(s): PANG, ROGER L
• Application Number:
  US09/554,505
• Time in Patent Office: 554 Days
• Field of Search: 743/35, 747/45
• US Class Current: 74/745
• CPC Class Codes: F16H 2200/0065 the gear ratios comprising nine forward speeds
• CPC Class Codes: F16H 2200/0086 the gear ratios comprising two reverse speeds
• CPC Class Codes: F16H 3/0915 with coaxial input and output shafts
• CPC Class Codes: F16H 37/046 with an additional planetary gear train, e.g. creep gear, overdrive
• CPC Class Codes: Y10T 74/19167 In series plural interchangeably locked nonplanetary units
• CPC Class Codes: Y10T 74/19251 Control mechanism

Abstract

To obtain in a 12-speed transmission for utility vehicles in 2×3×2 construction moving a logical shift diagram by alternating shifting movements back and forth with a continuously increasing or decreasing gear sequence, the two gear steps of the front-mounted section (GV) are manually shifted alternate for each gear step of a pneumatically shifted main section (GR). The rear steps of the main section (GH) are activated pneumatically by activating devices (S1, S2, S3) when changing from one to the next gear step. The transition from the slow to fast step (L, S) of each gear step is automatically carried out pneumatically by the rear-mounted section (GP).

Claims

1. A 12-speed transmission for utility vehicles in 2×

3×

2 construction, the transmission comprising;

one of a 2-speed front section and 2-speed split front section (GV);

a 3-speed main section (GH); and

a 2-speed rear-mounted section (GP);

and the transmission having a manually actuated shifting device and a plurality of pneumatically actuated shifting devices;

wherein the front section (GV) and the 3-speed main section (GH) provide six forward speeds and at least one reverse gear, the front section (GV) is manually actuated by manual operation of the manual shifting device and the 3-speed main section (GH) is pneumatic actuated by pneumatic operation of the plurality of pneumatically actuated shifting devices, and the rear-mounted 2-speed section (GP) is pneumatically actuated by a pneumatically actuated shifting device to provide the 12-speed transmission.

2. The transmission according to claim 1, wherein the 2-speed rear-mounted section (GP) includes means for automatically shifting the 2-speed rear-mounted section (GP) from a slow speed (L) to a high speed (S).

3. A 12-speed transmission for utility vehicles in 2×

3×

2 construction, the transmission comprising;

one of a 2-speed front section and 2-speed split front section (GV);

a 3-speed main section (GH); and

a 2-speed rear-mounted section (GP);

and the transmission having a manually actuated shifting device and a plurality of pneumatically actuated shifting devices;

wherein the front section (GV) and the 3-speed main section (GH) provide six forward speeds and at least one reverse gear, the front section (GV) is manually actuated by manual operation of the manual shifting device and the 3-speed main section (GH) is pneumatic actuated by pneumatic operation of the plurality of pneumatically actuated shifting devices, and the rear-mounted 2-speed section (GP) is pneumatically actuated by a pneumatically actuated shifting device to provide the 12-speed transmission; and

the manual shifting device has four gates (G_½

, G_¾

, G_⅚

, G_R) for providing the six forward speeds and the at least one reverse speed and alternately actuation of the two speeds of the front section (GV) one of increase and decrease a gear sequence of the transmission, a neutral gate (G_N) transversely interconnects each of the four gates, and a manual change of the manual shifting device from one gate to an adjacent gate controls the pneumatic operation of the plurality of pneumatically actuated shifting devices (S1, S2, S3) of the 3-speed main section (GH).

4. The transmission according to claim 3, wherein the 2-speed rear-mounted section (GP) includes means for automatically shifting the 2-speed rear-mounted section (GP) from a slow speed (L) to a high speed (S).

5. A 12-speed transmission for utility vehicles in 2×

3×

2 construction, the transmission comprising;

one of a 2-speed front section and 2-speed split front section (GV);

a 3-speed main section (GH); and

a 2-speed rear-mounted section (GP);

and the transmission having a manually actuated shifting device and a plurality of pneumatically actuated shifting devices;

wherein the front section (GV) and the 3-speed main section (GH) provide six forward speeds and at least one reverse gear, the front section (GV) is manually actuated by manual operation of the manual shifting device and the 3-speed main section (GH) is pneumatic actuated by pneumatic operation of the plurality of pneumatically actuated shifting devices and a manual change of the manual shifting device from one gate to an adjacent gate controls the pneumatic operation of the plurality of pneumatically actuated shifting devices of the 3-speed main section (GH), and the rear-mounted 2-speed section (GP) is pneumatically actuated by a pneumatically actuated shifting device to provide the 12-speed transmission.