Electropneumatic impact mechanism

An electric hand-held power tool comprising:

• an electropneumatic impact mechanism for an electric hand-held power tool, the impact mechanism including:
• a transmission housing;
• a guide tube arranged at least partially in the transmission housing;
• an exciter piston movable in the guide tube;
• a connecting rod coupled to the exciter piston;
• and an eccentric wheel designed as an externally toothed gearwheel and coupled to the connecting rod on one side and being mounted so as to be rotatable with respect to the transmission housing about an axis of rotation on the other side, the axis of rotation defining an axial direction, an axial gap being provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel;
• and
• an electric motor with a pinion for directly driving the eccentric wheel via the external toothing thereof, wherein the pinion and the external toothing of the eccentric wheel are located in a motor lubrication space, and wherein the connecting rod and a wheel surface of the eccentric wheel facing a cover shell are housed in an impact mechanism lubrication space hydraulically separated from the motor lubrication space.

An electropneumatic impact mechanism for an electric hand-held power tool, the impact mechanism comprising:

• a transmission housing;
• a guide tube arranged at least partially in the transmission housing;
• an exciter piston movable in the guide tube;
• a connecting rod coupled to the exciter piston;
• and
• an eccentric wheel designed as an externally toothed gearwheel and coupled to the connecting rod on one side and being mounted so as to be rotatable with respect to the transmission housing about an axis of rotation on the other side, the axis of rotation defining an axial direction;
• an axial gap being provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel;
• a radial spacing being provided between a contact point furthest away from the axis of rotation in a radial direction between the connecting rod and the eccentric wheel and a point in the circumference of a root circle of the eccentric wheel closest to the contact point;
• and
• a lubrication space separating element received in the axial gap and in the radial spacing, the lubrication space separating element having an annular sealing collar with a dynamic sealing ring arranged coaxially with respect to the axis of rotation and pressed against the radial spacing.

An electropneumatic impact mechanism for an electric hand-held power tool, the impact mechanism comprising:

• a transmission housing;
• a guide tube arranged at least partially in the transmission housing;
• an exciter piston movable in the guide tube;
• a connecting rod coupled to the exciter piston;
• and
• an eccentric wheel designed as an externally toothed gearwheel and coupled to the connecting rod on one side and being mounted so as to be rotatable with respect to the transmission housing about an axis of rotation on the other side, the axis of rotation defining an axial direction;
• an axial gap being provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel;
• a radial spacing being provided between a contact point furthest away from the axis of rotation in a radial direction between the connecting rod and the eccentric wheel and a point in the circumference of a root circle of the eccentric wheel closest to the contact point;
• and
• a lubrication space separating element received in the axial gap and in the radial spacing, the lubrication space separating element having an end sealing collar at least partially sealing the eccentric wheel in relation to a housing wall and has a static sealing ring.