Adapter for roller tappet of engine and engine roller tappet assembly including same
An adapter for a roller tappet of an engine may include a body and a support. The body may be combined with a cylinder block of the engine. The body may include oil inlet connected to main gallery of the cylinder block to receive an oil from the main gallery. The support may be extended from one end of the body to support the roller tappet. The support may include a first oil passageway connected to the oil inlet. The first oil passageway is formed through the body and the support to supply the oil supplied from the oil inlet to the roller tappet. Thus, the oil may be supplied from the main gallery to the roller tappet through the oil passageway so that it may not be required to form an additional oil passageway, which may supply the oil to the roller tappet, in the cylinder block.
1. An adapter for a roller tappet of an engine, the adapter comprising:
a body combined with a cylinder block of the engine, the body including an oil inlet connected to a main gallery of the cylinder block to receive an oil from the main gallery;
a support extended from one end of the body to support the roller tappet, the support including a first oil passageway connected to the oil inlet; and
a piston cooling jet combined with the body,
wherein
the body further includes a second oil passageway extended from the oil inlet toward the other end of the body,
the piston cooling jet is connected to the second oil passageway,
the first oil passageway is formed through the body and the support to supply the oil introduced into the oil inlet to the roller tappet, and
the body, the support, and the piston cooling jet are together insertable into or removable from the cylinder block.
2. The adapter of claim 1 , wherein the body further comprises a threaded portion threadedly combined with the cylinder block.
3. The adapter of claim 2 , wherein the body further comprises a bolt for threadedly combining the threaded portion with the cylinder block.
4. A roller tappet assembly of an engine, the roller tappet assembly comprising:
a roller housing configured to support a tappet rod movably arranged in a cylinder block of the engine along a vertical direction;
a tappet roller rotatably connected to one end of the roller housing, the tappet roller rotatably making contact with a cam to allow a linear reciprocal motion of the tappet rod;
an adapter combined with the cylinder block to support the roller housing, the adapter including an oil passageway for supplying an oil in a main gallery of the cylinder block into the roller housing; and
a piston cooling jet combined with the adapter and connected to the oil passageway,
wherein the adapter and the piston cooling jet are together insertable into or removable from the cylinder block.
5. The roller tappet assembly of claim 4 , wherein the roller housing comprises a rotation-preventing groove configured to receive the adapter.
6. The roller tappet assembly of claim 4 , wherein the adapter comprises a threaded portion, and the cylinder block comprises a thread portion combined with the threaded portion of the adapter.
7. The roller tappet assembly of claim 4 , wherein the cylinder block comprises a fixing hole formed through the cylinder block and connected to an inner portion of the cylinder block where the roller housing is installed, the adapter is inserted into the fixing hole, and the fixing hole has a threaded portion combined with a threaded portion formed on an outer surface of the adapter.
8. The roller tappet assembly of claim 4 , wherein the rotation-preventing groove is formed through the roller housing, the oil passageway is formed in the adapter and connected to the main gallery when installing the adapter, and the oil in the main gallery is supplied to the roller housing through the oil passageway and the rotation-preventing groove when installing the adapter.