Control mechanism for injection pump
AssigneeDaimler-Benz Aktiengesellschaft
InventorUlrich Augustin
Life of this patent
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Abstract
A control mechanism for an injection pump for internal combustion engines, espcially for Diesel engines, which includes an axially displaceable control rod changing the injection quantity by axial displacement and an adjusting lever for the control rod which is pivotally connected with the latter and is in operative engagement with a fuel quantity lever actuatable at will to adjust the engine power; a further point of pivotal connection of the adjusting lever is displaceable by a first cam surface as a function of the rotational speed of the engine to provide a partial load control while a maximum abutment adjustment for the control rod which provides a full load limitation on the basis of contacting a second cam surface, is also actuated as a function of the rotational speed.
Claims86
In an internal combustion engine having a predetermined operating range and an injection pump which supplies fuel to said engine over said operating range, a control mechanism for controlling said injection pump, said control mechanism comprising:
- a control rod member axially displaceable in the injection pump for directly varying the injection quantity of said pump as a function of the position of said control rod member,
- a freely movable injection pump adjusting lever,
- means for connecting the control rod member with said adjusting lever,
- an arbitrarily operable fuel quantity lever,
- means for connecting said fuel quantity lever to said adjusting lever,
- speed responsive governor means including a governor member movable as a function of the speed of an internal combustion engine,
- movable cam means defining first and second linear cam surfaces,
- a motion connecting means interposed between said cam means and said movable governor member for moving said cam means in response to the movement of said governor member,
- a first cam follower selectively engageable with a first of the linear cam surfaces,
- a second cam follower relatively engageable with a second of the linear cam surfaces,
- means for mounting said first cam follower to said adjusting lever at a fixed location such that the position of said adjusting lever controls the position of said control rod member in response to the position of the cam means over a first portion of the operating range of said engine,
- means for mounting said second cam follower to said control rod member such that when said second cam follower contacts said cam means over a second portion of the operating range of said engine, a displacement of said control rod member in a direction permitting higher quantities of fuel to be injected in the engine is blocked,
- said means for mounting said first cam follower to said adjusting lever, said means for mounting said second cam follower to said control rod member, said means for connecting said control rod member with said adjusting lever, and said means for connecting said fuel quantity lever to said adjusting lever being arranged with respect to one another so that in each case only one of said first cam follower and said second cam follower respectively contact their associated cam surfaces with the respective cam followers being alternatingly mutually disengageable from their associated cam surfaces.
Dependencies are inferred from the claim text.