APPARATUS, SYSTEMS AND METHODS FOR INDEXED HYDRAULIC ROLLER LIFTERS
The disclosed apparatus, systems and methods relate to an indexed hydraulic roller lifter for use in internal combustion engines.
This application claims priority to U.S. Provisional Application No. 62/342,017, filed May 26, 2016 and entitled “Apparatus, Systems and Methods for Improved Hydraulic Roller Lifters,” which is hereby incorporated by reference in its entirety under 35 U.S.C. §119(e).
TECHNICAL FIELDThe disclosure relates to an indexed hydraulic roller lifter and associated systems and methods. Namely, the disclosed embodiments relate to a hydraulic roller lifter having an indexed portion to reduce friction on the cam head and prevent rotation of the lifter.
BACKGROUNDInternal combustion engines (“ICE”) have been around for over 100 years. The ongoing need to improve performance in push rod engines is crucial if we are to reduce the effect of greenhouse gas emissions. Hydraulic roller lifters as opposed to hydraulic flat lifters can reduce friction between the cam and the lifter thus increasing engine efficiency. This roller lifter must be indexed for the rollers to roll on the cam.
Most roller lifters are paired to accomplish this, however, to replace hydraulic flat lifters with roller lifters, pairing is not always an option in existing engine blocks. Newer engine designs—some experimental—have the lifter and rod assembly inside the engine, exposing them to coolant. There is need for an indexed lifter/rod assembly. This assembly will index the roller lifter with respect to the cam and protect the oil lubricant from being contaminated with the water based coolant.
BRIEF SUMMARYOne general aspect includes a hydraulic roller lifter, including a lifter body having first and second ends; at least one indexing portion set into the first end; and a wheel disposed at the second end. Implementations may include one or more of the following aspects. The hydraulic roller lifter further including a roller lifter tube. The hydraulic roller lifter where the roller lifter tube defines a lumen. The hydraulic roller lifter where the lumen defines at least one index tab. The hydraulic roller lifter where the roller lifter tube is press-fit into an engine block. The hydraulic roller lifter where the at least one index tab is constructed and arranged to prevent rotational movement of the lifter body. The hydraulic roller lifter where the at least one index tab is constructed and arranged to prevent rotational movement of the lifter body at the indexing portion. The hydraulic roller lifter further including a sleeve.
While multiple embodiments are disclosed, still other embodiments of the disclosure will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the disclosed apparatus, systems and methods. As will be realized, the disclosed apparatus, systems and methods are capable of modifications in various obvious aspects, all without departing from the spirit and scope of the disclosure. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.
The various implementations disclosed or contemplated herein relate to indexed roller lifters used in internal combustion engines, including hydrogen-powered engines. In various implementations, the disclosed devices, systems and methods relate to indexed roller lifters for use in internal combustion engines. In certain implementations, these lifters have a housing having an indexed portion that abuts against the engine block to prevent rotation. Several aspects and implementations of these lifters are described herein with reference to the figures.
Turning to the drawings in greater detail, a typical hydraulic “flat” lifter 10 is shown in
That is, the cam lobe 16 and base 12 are in mechanical communication such that the rotational movement of the cam 14 (shown at reference arrow A) via the cam shaft 18 brings the cam lobe 16 into alignment with the lifter 10 base 12 so as to “raise” the lifter 10 relative to the cam shaft 18, as is well understood in the art, and is shown by reference arrow B. One of skill in the art will appreciate the translation of rotational to linear motion in these components.
It is further understood that in implementations like that of
As shown in
In implementations like that of
As shown in
Turning to the indexed roller lifter 50 implementations,
Continuing with the implementations of
In these implementations, the internal indexing tabs 72A, 72B are disposed within the lumen 64 at the proximal end 64A. These indexing tabs 72A, 72B are constructed and arranged to pair with the indexing regions 60A, 60B of the roller lifter 50 so as to prevent roller lifter 50 rotation within the tube 64 or lumen while allowing it to move vertically (shown by reference arrow B). It is understood that the lumen's proximal end 64A also features a lifter rod opening 61 configured to allow the lifter rod 64 to operate through.
In these implementations, the tube or lumen 64 is indexed 72A, 72B and press fit 74 into the engine block so the internal indexing tabs 72A, 72B align with the indexing regions so as to orient the body 52 such that the wheels 22 are aligned with the rolling surface of the cam 14 (as shown in
Further, with the hydraulic roller lifter tube 64 installed, a indexed roller lifter 50 can fit and be indexed (
It is understood that in implementations like those of
In these embodiments, and as is also shown in
In the implementations of
In various implementations, the indexed roller lifter 50 can be used with a protection sleeve 82 that would allow the push rod 76 to be isolated from the surrounding environment. As shown in
It is understood that these implementations are used in very specific racing applications which has a key way to index the roller lifter. This lifter 100 is not hydraulic and will need a separate oiling system to the rocker arms (not shown). It is not compatible with any production roller lifter and requires an offset of the push rod. This lifter 100 is also installed into the top of the sleeve having no means of sealing. In various implementations, this indexed lifter 50 is installed into the hydraulic roller lifter tube 64 described above, thereby giving the option for the lifter/rod assembly to be either completely sealed or open.
In summary, a new design for use of roller lifters in engines has been shown that can enhance engine performance in power, efficiency and longevity.
Although the present invention has been described with reference to preferred embodiments, persons skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention.
While multiple embodiments are disclosed, still other embodiments of the present invention will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the invention. As will be realized, the invention is capable of modifications in various obvious aspects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.
Claims
1. A hydraulic roller lifter, comprising:
- a. a lifter body having first and second ends;
- b. at least one indexing portion set into the first end; and
- b. a wheel disposed at the second end.
2. The hydraulic roller lifter of claim 1, further comprising a roller lifter tube.
3. The hydraulic roller lifter of claim 2, wherein the roller lifter tube defines a lumen.
4. The hydraulic roller lifter of claim 3, wherein the lumen defines at least one index tab.
5. The hydraulic roller lifter of claim 4, wherein the roller lifter tube is press-fit into an engine block.
6. The hydraulic roller lifter of claim 5, wherein the at least one index tab is constructed and arranged to prevent rotational movement of the lifter body.
7. The hydraulic roller lifter of claim 5, wherein the at least one index tab is constructed and arranged to prevent rotational movement of the lifter body at the indexing portion.
8. The hydraulic roller lifter of claim 1, further comprising a sleeve.
Type: Application
Filed: May 26, 2017
Publication Date: Nov 30, 2017
Inventors: Charles Ingram (Greeneville, TN), Ted Hollinger (Algona, IA)
Application Number: 15/607,065