Injection pump for internal combustion engines专利检索-喷油泵泵和压缩机专利检索查询-专利查询网

Injection pump for internal combustion engines

阅读：209发布：2021-10-11

专利汇可以提供Injection pump for internal combustion engines专利检索，专利查询，专利分析的服务。并且An injection pump for an internal combustion engine, has a casing in which a hollow cam shaft carrying at least one pumpoperating cam is rotatably supported. A driving shaft extends within the hollow camshaft, and an axially displaceable coupling sleeve is interposed between the driving shaft and the camshaft. A fluid pressure servocontrol such as an hydraulic annular piston, are housed within said hollow camshaft for controlling axial displacement of the coupling sleeve, the latter having, for example, helicoidal splines, so that displacement of said sleeve axially varies the relative angular position of the camshaft and the driving shaft and thereby the relative timing of the operation of a pumping member operated by the rotation of the camshaft. To assist reliable operation at low pressures the outer diameter of the annular actuator piston should exceed its inner diameter by at least 65 percent.，下面是Injection pump for internal combustion engines专利的具体信息内容。

权利要求

1. A fuel-injection pump for an internal combustion engine including a hollow casing, bearing means in said casing and an automatic hydraulic timing device rotatably supported by said bearing means, wherein said automatic device comprises in combination: a. a tubular cam-carrying body mounted for rotation directly in the pump casing; b. at least one pump-operating cam carried on the outer periphery of said tubular shaft; c. a driving shaft extending into said tubular body and being formed with a head arranged near one end of said body and mounted for rotation directly in said body and with a portion smaller in diameter than the inner bore of said body provided with an adapter for connection to a rotary drive input extending beyond the other end of said body; d. means acting directly between said tubular cam-carrying body and said driving shaft for preventing any relative axial displacement of said body and shaft; e. an annular support in the bore in said tubular body in proximity of said other end of said body and rotatably supporting the driving shaft near said adapter, said annular support defining, together with the tubular body the drive shaft and the respective head, an axially extending annular chamber; f. injection-timing means including an axially displaceable coupling member arranged in said annular chamber in the form of a sleeve provided with internal and external splined connections to the driving shaft and the tubular body respectively, at least one splined connection being helical; g. fluid pressure servocontrol means within said tubular body to vary the axial position of said sleeve, said servocontrol means including an annular piston mounted for sliding movement on the part of the driving shaft arranged between said sleeve and said annular support and bearing against the end of said sleeve facing said support to effect axial displacement thereof; h. a centrifugal governor, controlling the supply of pressure fluid to said servocontrol means dependently upon the rotary speed of the driving shaft, housed in the bore in the tubular body between the head of the drive shaft and a cover closing said one end of the tubular body.

2. Pump as claimed in claim 1, wherein said means for preventing any mutual axial displacement of said tubular body and driving shaft comprises a retaining ring secured in one end of the tubular body and a radial shoulder facing said ring and formed inside the inner bore in said body, both abutting outer marginal portions of the opposite faces of said head formed on the driving shaft.

3. Pump as claimed in claim 1, wherein said means for preventing any mutual axial displacement of said tubular body and driving shaft compriSes a radial shoulder facing said cover and formed inside the inner bore in said body and an annular element which abuts the end of the tubular body opposite said cover and a locking ring attached to the portion of the driving shaft adjacent the respective end adapter, and holding said annular element in place.

4. Pump as claimed in claim 1, wherein the outer diameter of said annular piston exceeds its inner diameter by at least 65 percent.

5. Pump as claimed in claim 1, wherein the outer diameter of said annular piston is twice its inner diameter.

6. Pump as claimed in claim 1, wherein the outer diameter of the annular piston is equal to or greater than the outer diameter of the said head of the driving shaft.

7. Pump as claimed in claim 1, wherein the internal surface of the hollow cam-carrying body is provided with a shoulder which acts as a stop limiting movement of the annular piston under the action of the pressure fluid.

8. Pump as claimed in claim 7, including a ring received in a part of the bore of the cam-carrying body and having a lateral face defining said stop.

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Injection pump for internal combustion engines

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