# US 2019/0170085 A1 · Cylinder head

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- Number: US 2019/0170085 A1
- Document ID: US20190170085A1
- Status: Published application
- Kind: A1
- Application number: 16/196,712
- Filed: 2018-11-20
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Takaaki NAKAZONO
- Web page: https://patentgrep.com/patent/US20190170085A1

## CPC

- F02F 7/006: {Camshaft or pushrod housings}
- F01L 1/053: overhead type
- F02F 1/24: Cylinder heads
- F02F 7/008: {Sound insulation}
- F01L 2001/0537: {Double overhead camshafts [DOHC]}
- F01L 2301/00: Using particular materials
- F01L 2810/03: Reducing vibration
- F01L 2810/04: Reducing noise
- F02B 2275/18: DOHC [Double overhead camshaft]
- F02F 2007/0063: {Head bolts; Arrangements of cylinder head bolts}
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

A camshaft housing includes two longitudinal frame bars and lateral frame bars. The longitudinal frame bars extend in the axial direction of a camshaft. The lateral frame bars extend between the longitudinal frame bars. A bearing portion is arranged in each of the lateral frame bars to rotationally support the camshaft. Each lateral frame bar has a bolt hole to receive a bolt that is inserted through the bolt hole to fix the camshaft housing to a cylinder head body. The bolt hole extends through the lateral frame bar and is arranged on the outer side of the bearing portion in the longitudinal direction of the lateral frame bar. Each longitudinal frame bar has a vibration reducing portion. The cross-sectional area of the longitudinal frame bar gradually changes in the longitudinal direction of the longitudinal frame bar.

## Claims

### Claim 1

A cylinder head comprising:
a cylinder head body fixed to an upper surface of a cylinder block; and
a camshaft housing fixed to an upper surface of the cylinder head body, wherein
a camshaft is accommodated in the camshaft housing,
the camshaft housing includes
two longitudinal frame bars, which extend in an axial direction of the camshaft, and
a plurality of lateral frame bars, which extend between the longitudinal frame bars,
a bearing portion is arranged in an upper surface of each of the lateral frame bars to rotationally support the camshaft,
each of the bearing portions is a portion recessed from the upper surface of one of the lateral frame bars,
a bolt hole is provided in each lateral frame bar to receive a bolt that is inserted through the bolt hole to fix the camshaft housing to the cylinder head body,
each of the bolt holes extends through one of the lateral frame bars and is arranged on an outer side of the corresponding bearing portion in a longitudinal direction of the lateral frame bar,
the longitudinal frame bars each have a plurality of joint points at which the longitudinal frame bar is joined to the corresponding lateral frame bar, and
each longitudinal frame bar includes, between adjacent two of the joint points, a vibration reducing portion, wherein a cross-sectional area of a cross section of the vibration reducing portion that is perpendicular to a longitudinal direction of the longitudinal frame bar gradually changes in the longitudinal direction of the longitudinal frame bar.

### Claim 2 (depends on 1)

The cylinder head according to claim 1, wherein the vibration reducing portion is arranged continuously from at least one of the adjacent two of the joint points to a middle between the two adjacent joint points.

### Claim 3 (depends on 1)

The cylinder head according to claim 1, wherein the vibration reducing portion includes
an arcuate curved surface that becomes recessed more downward toward the middle between the two adjacent joint points, and
an arcuate curved surface that becomes recessed more outward in the longitudinal direction of the associated lateral frame bar toward the middle between the two adjacent joint points.

### Claim 4 (depends on 1)

The cylinder head according to claim 1, wherein
the vibration reducing portion is arranged over an entire area between the two adjacent joint points,
the vibration reducing portion has a perpendicular cross section perpendicular to the longitudinal frame bar, and
a cross-sectional area of the perpendicular cross section is the smallest in the middle between the two adjacent joint points.

### Claim 5 (depends on 4)

The cylinder head according to claim 4, wherein
a material of the camshaft housing is the same as a material of the cylinder head body, and
a liquid gasket is arranged between the camshaft housing and the cylinder head body.