Tappet

Patent metadata

Field	Value
Publication number	US-10876441-B2
Application number	US-201816483123-A
Country	US
Kind code	B2
Filing date	Jan 26, 2018
Priority date	Feb 10, 2017
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A tappet (10) includes: a lash adjuster (11) having a plunger (14) and a body (13) in which the plunger (14) is housed so as to be vertically movable, wherein the plunger (14) has a top portion (16) against which a lower end portion of a push rod (88) slidably abuts; and a tappet body (12) which has an assembly hole (45) in which the body (13) is inserted, has a cup-like shape, and has a lower surface portion (27) which slidingly contacts a cam (70). The tappet body (12) has an oil guide passage (30) extending so as to guide lubricating oil from the push rod (88) side to the cam (70).

First claim

The invention claimed is:

1. A tappet comprising:
a lash adjuster; and
a tappet body into which the lash adjuster is inserted and incorporated,
wherein
the lash adjuster has a plunger having a top portion on which a lower end portion of a push rod is slidable, and a body in which the plunger is housed so as to be vertically movable,
the tappet body has
a lower surface portion which slidingly contacts a cam,
an outer peripheral surface portion which is slidable on a tappet guide,
a receiving surface portion which is located inside the outer peripheral surface portion, receives lubricating oil, and faces upward,
an assembly hole which is located inside the outer peripheral surface portion, extends vertically, and has an upper end opened to the receiving surface portion and a lower end closed, and in which the body of the lash adjuster is inserted and assembled, and
a receiving space which is located inside the outer peripheral surface portion and opened to an upside of the receiving surface portion,

the tappet body further has a bottom wall having the lower surface portion, and a peripheral wall rising upward from an outer peripheral edge of the bottom wall and having the outer peripheral surface portion,
the peripheral wall has a first-walled portion surrounding a periphery of the receiving space, and a second-walled portion surrounding a periphery of the assembly hole, wherein the first-walled portion is thinner than the second walled-portion, and
the receiving surface portion is provided on an upper surface of the second-walled portion.

2. The tappet according to claim 1 , further comprising an oil guide passage located at the outer peripheral surface portion or between the outer peripheral surface portion and the assembly hole and extending so as to guide the lubricating oil received by the receiving surface portion to the cam, wherein the oil guide passage has an oil guide groove extending vertically in the outer peripheral surface portion.

3. The tappet according to claim 2 , wherein the tappet body has an oil guide hole which penetrates the peripheral wall defining an outer periphery of the receiving space and communicates with an upper end portion of the oil guide groove.

4. The tappet according to claim 3 , wherein the oil guide passage has a circumferential groove which is provided in a lower end portion of the outer peripheral surface portion, extends circumferentially and communicates with a lower end portion of the oil guide groove.

5. The tappet according to claim 4 , wherein a lower surface of the circumferential groove is a downslope which is inclined downward from an inner surface of the circumferential groove toward outside.

6. The tappet according to claim 4 , wherein the oil guide passage has a communication hole penetrating an outer peripheral portion of the assembly hole of the tappet body from a side surface of the assembly hole to the outer peripheral surface portion.

7. The tappet according to claim 3 , wherein the oil guide passage has a communication hole penetrating an outer peripheral portion of the assembly hole of the tappet body from a side surface of the assembly hole to the outer peripheral surface portion.

8. The tappet according to claim 2 , wherein the oil guide passage has a circumferential groove which is provided in a lower end portion of the outer peripheral surface portion, extends circumferentially and communicates with a lower end portion of the oil guide groove.

9. The tappet according to claim 8 , wherein a lower surface of the circumferential groove is a downslope which is inclined downward from an inner surface of the circumferential groove toward outside.

10. The tappet according to claim 9 , wherein the oil guide passage has a communication hole penetrating an outer peripheral portion of the assembly hole of the tappet body from a side surface of the assembly hole to the outer peripheral surface portion.

11. The tappet according to claim 8 , wherein the oil guide passage has a communication hole penetrating an outer peripheral portion of the assembly hole of the tappet body from a side surface of the assembly hole to the outer peripheral surface portion.

12. The tappet according to claim 2 , wherein the oil guide passage has a communication hole penetrating an outer peripheral portion of the assembly hole of the tappet body from a side surface of the assembly hole to the outer peripheral surface portion.

13. The tappet according to claim 1 , further comprising an oil guide passage located at the outer peripheral surface portion or between the outer peripheral surface portion and the assembly hole and extending so as to guide the lubricating oil received by the receiving surface portion to the cam.

14. The tappet according to claim 13 , wherein the oil guide passage has a communication hole penetrating an outer peripheral portion of the assembly hole of the tappet body from a side surface of the assembly hole to the outer peripheral surface portion.

15. The tappet according to claim 1 , further comprising an oil guide passage that includes a vertically extending groove formed in the outer peripheral surface portion.

16. The tappet according to claim 15 , wherein the oil guide passage further includes a circumferential groove provided in a lower end portion of the outer peripheral surface portion, and which extends circumferentially about the tappet body.

17. The tappet according to claim 1 , wherein the tappet body includes a circumferential groove provided in a lower end portion of the outer peripheral surface portion, and the circumferential groove extends circumferentially about the tappet body and has a lower surface that has a downslope which is inclined downward from an inner surface of the circumferential groove to the outer peripheral surface portion.

18. The tappet according to claim 1 , further comprising an oil guide hole formed in the receiving surface portion.

19. A tappet comprising:
a lash adjuster; and
a tappet body into which the lash adjuster is inserted and incorporated,
wherein
the lash adjuster has a plunger having a top portion on which a lower end portion of a push rod is slidable, and a body in which the plunger is housed so as to be vertically movable,
the tappet body has
a lower surface portion which slidingly contacts a cam,
an outer peripheral surface portion which is slidable on a tappet guide,
a receiving surface portion which is located inside the outer peripheral surface portion, receives lubricating oil, and faces upward,
an assembly hole which is located inside the outer peripheral surface portion, extends vertically, and has an upper end opened to the receiving surface portion and a lower end closed, and in which the body of the lash adjuster is inserted and assembled, and
a receiving space which is located inside the outer peripheral surface portion and opened to an upside of the receiving surface portion,

the tappet further comprises an oil guide passage located at the outer peripheral surface portion or between the outer peripheral surface portion and the assembly hole and extending so as to guide the lubricating oil received by the receiving surface portion to the cam, and the oil guide passage has an oil guide groove extending vertically in the outer peripheral surface portion,
the oil guide passage has a circumferential groove which is provided in a lower end portion of the outer peripheral surface portion, extends circumferentially and communicates with a lower end portion of the oil guide groove,
the tappet body has a retai

Assignees

• Otics Corp
• Kubota Kk

Inventors

• Woon Hon Chung
• Takami Masayasu

Classifications

• F16H53/06

  Cam-followers (F16H53/08 takes precedence) · CPC title

• F01M9/104

  of tappets · CPC title

• F01L1/245 Primary

  Hydraulic tappets · CPC title

• F01L1/146 Primary

  Push-rods · CPC title

• F01L2810/02

  Lubrication · CPC title