JPH0214990B2 - - Google Patents
Info
- Publication number
- JPH0214990B2 JPH0214990B2 JP58170243A JP17024383A JPH0214990B2 JP H0214990 B2 JPH0214990 B2 JP H0214990B2 JP 58170243 A JP58170243 A JP 58170243A JP 17024383 A JP17024383 A JP 17024383A JP H0214990 B2 JPH0214990 B2 JP H0214990B2
- Authority
- JP
- Japan
- Prior art keywords
- roller tappet
- lubricating oil
- fuel injection
- injection pump
- cam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000010687 lubricating oil Substances 0.000 claims description 20
- 239000000446 fuel Substances 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000010802 sludge Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は内燃機関の燃料噴射ポンプに関するも
のであり、特には燃料噴射ポンプに用いられるロ
ーラタペツトに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel injection pump for an internal combustion engine, and more particularly to a roller tappet used in a fuel injection pump.
従来燃料噴射ポンプのカム等の部品の潤滑は潤
滑油供給溝からタペツト外周面と案内シリンダ内
面との間のわずかなクリアランスを通つて供給さ
れていた。このため、潤滑油圧力の低い機関にこ
のような燃料噴射ポンプが搭載された場合には、
潤滑油がローラタペツト外周面と案内シリンダ内
面との間に形成されるわずかなクリアランスに入
りにくく、このためカムシヤフトへの潤滑量が充
分でなくカムが異常摩耗することがあつた。
Conventionally, lubrication of parts such as the cam of a fuel injection pump has been supplied from a lubricating oil supply groove through a small clearance between the outer peripheral surface of the tappet and the inner surface of the guide cylinder. Therefore, if such a fuel injection pump is installed in an engine with low lubricating oil pressure,
It was difficult for lubricating oil to enter the small clearance formed between the outer circumferential surface of the roller tappet and the inner surface of the guide cylinder, and as a result, the amount of lubrication to the camshaft was insufficient, resulting in abnormal wear of the cam.
カムへの潤滑油の供給量を増やすためにローラ
タペツト外周面と案内シリンダ内面との間のクリ
アランスを大きくして対策した場合にはローラタ
ペツトのガタが大きくなり、ローラタペツト外周
面や案内シリンダ２の内周面に異常摩耗を起こし
たり、カムに供給される潤滑油量のバラツキが非
常に大きくなるという不具合があつた。 If the clearance between the outer circumferential surface of the roller tappet and the inner surface of the guide cylinder 2 is increased in order to increase the amount of lubricating oil supplied to the cam, the backlash of the roller tappet will increase, causing damage to the outer circumferential surface of the roller tappet and the inner circumference of the guide cylinder 2. There were problems such as abnormal wear on the surface and extremely large variations in the amount of lubricant supplied to the cam.
また、特公昭44−8537のように潤滑油供給孔
と、ローラタペツトの側面に設けた小穴がローラ
タペツトの往復運動中に一致することにより、ロ
ーラタペツト側面に設けられた小穴を通して潤滑
油が供給され、カムを潤滑する方式の潤滑におい
てはローラタペツト側面にあけられた小穴の穴径
が小さいと、潤滑油中に含まれる摩耗粉やスラツ
ジ等の蓄積により小穴が塞がれてしまうという不
具合が起こることがあつた。ローラタペツト側面
にあけられた小穴が摩耗粉やスラツジ等により塞
がれないようにするためにはローラタペツト側面
に設けられる小穴の径を大きくしておく必要があ
るが、その場合にはローラタペツト側面にあけら
れた小穴が大きいため潤滑油が多大に供給され、
その結果燃料噴射ポンプのガバナウエートの開閉
作動が不良となり、内燃機関のハンチングの発生
原因となることがあつた。 In addition, as in Japanese Patent Publication No. 44-8537, the lubricating oil supply hole and the small hole provided on the side of the roller tappet coincide during reciprocating motion of the roller tappet, so that lubricating oil is supplied through the small hole provided on the side of the roller tappet, and the cam If the diameter of the small hole drilled on the side of the roller tappet is small, a problem may occur where the small hole becomes blocked due to the accumulation of wear particles and sludge contained in the lubricating oil. Ta. In order to prevent the small hole drilled on the side surface of the roller tappet from being blocked by abrasion particles or sludge, it is necessary to increase the diameter of the small hole drilled on the side surface of the roller tapepet. Since the small hole is large, a large amount of lubricating oil is supplied,
As a result, the opening/closing operation of the governor weight of the fuel injection pump becomes defective, which may cause hunting in the internal combustion engine.
本発明は、前記問題点に鑑み、潤滑油供給量を
適量に保つとともに、潤滑油供給通路が潤滑油中
に含まれる摩耗粉やスラツジ等の異物によつてつ
まることがない、カム面への安定した潤滑が得ら
れる燃料噴射ポンプのローラタペツトを供給する
ことを目的とする。
In view of the above-mentioned problems, the present invention maintains the lubricating oil supply amount at an appropriate level, and prevents the lubricating oil supply passage from being clogged with foreign matter such as abrasion powder and sludge contained in the lubricating oil, and provides a method to the cam surface. The purpose is to provide a roller tappet for fuel injection pumps that provides stable lubrication.
以下、本発明を実施例に基づいて説明する。 Hereinafter, the present invention will be explained based on examples.
第１図は本発明のローラタペツトを組込んだ燃
料噴射ポンプの部分断面図であり、第２図は本発
明のローラタペツトの第１実施例である。ａは正
面図、ｂは側面図である。 FIG. 1 is a partial sectional view of a fuel injection pump incorporating the roller tappet of the present invention, and FIG. 2 is a first embodiment of the roller tappet of the present invention. A is a front view, and b is a side view.
ローラタペツト３の側面にはローラタペツト３
の下端面に開口する連続した平面状の切欠部２４
が設けられており、その反対側の側面には滑動片
１７が設けられている。第２図に示されるような
ローラタペツト３は第１図に示されるように燃料
噴射ポンプに組込まれ、ローラタペツト３の切欠
部２４は案内シリンダ２に開口する供給孔２２と
対向して組みつけられている。 Roller tappet 3 is attached to the side of roller tappet 3.
A continuous planar notch 24 that opens on the lower end surface of
is provided, and a sliding piece 17 is provided on the opposite side surface. The roller tappet 3 as shown in FIG. 2 is assembled into a fuel injection pump as shown in FIG. There is.
第１図により、燃料噴射ポンプの構成を説明す
る。 The configuration of the fuel injection pump will be explained with reference to FIG.
燃料噴射ポンプの外筐１中において、案内シリ
ンダ２内面をローラタペツト３が滑動し、そのロ
ーラ４がコイルバネ５の作用でカム軸６のカム６
ａのローラパスへ向かつて押しつけられ、カム軸
は図示しない内燃機関により駆動される。バネ５
は一方では、バネ受７を介して外筐１の肩部８
に、他方ではポンププランジヤ１０の駆動側端部
につり下げられているバネ受９に支えられてい
る。このプランジヤ１０は外筐１中に固着されて
いるシリンダブツシユ１１中を案内される。 In the outer casing 1 of the fuel injection pump, a roller tappet 3 slides on the inner surface of a guide cylinder 2, and the roller 4 is moved by a cam 6 of a camshaft 6 under the action of a coil spring 5.
The camshaft is driven by an internal combustion engine (not shown). spring 5
On the other hand, the shoulder portion 8 of the outer casing 1 is connected via the spring receiver 7.
On the other hand, it is supported by a spring receiver 9 suspended from the drive side end of the pump plunger 10. This plunger 10 is guided in a cylinder bush 11 which is fixed in the outer housing 1.
ローラタペツトとバネ受９によつて分離され、
潤滑油を供給されるべき２つの空間、即ち、カム
軸空間１３とその上にあるタペツトバネ空間１４
は各バネ受９中において、中心からずれて配置さ
れた平衡孔１５により互いにつながれている。カ
ム軸空間１３は蓋１６に取外しにより、外部から
接近可能である。突起１８でローラタペツト３の
放射上孔中にはまる滑動片１７は外筐１の溝１９
中を案内され、ローラタペツト３が回るのを防止
する。 separated by a roller tappet and a spring receiver 9;
Two spaces to be supplied with lubricating oil, namely the camshaft space 13 and the tappet spring space 14 above it.
are connected to each other in each spring receiver 9 by a counterbalance hole 15 arranged offset from the center. The camshaft space 13 can be accessed from the outside by removing the lid 16. The sliding piece 17 that fits into the radial upper hole of the roller tappet 3 with the projection 18 is inserted into the groove 19 of the outer casing 1.
It is guided inside and prevents the roller tappet 3 from rotating.
供給孔２２はローラタペツト３の側面に設けら
れた切欠部２４とつながれている。そして、潤滑
油は図中の矢印に示す如く導管２０、連通ナツト
２１、供給穴２２を経てカム６ａの面へ供給され
る。 The supply hole 22 is connected to a notch 24 provided in the side surface of the roller tappet 3. The lubricating oil is then supplied to the surface of the cam 6a through the conduit 20, the communicating nut 21, and the supply hole 22 as shown by the arrow in the figure.
以上説明したように、本発明の燃料噴射ポンプ
のローラタペツトはローラタペツト３の側面部分
にローラタペツト３の下端面へ開口する連続した
平面状の切欠部２４を設け、切欠部２４を潤滑油
通路としており、潤滑油通路をなす切欠部２４と
案内シリンダ２内面との間で常に相対的な移動が
行われることによつて異物がかきとられると共
に、切欠部２４がローラタペツト３の下端面へ開
口していることによつてかきとられた異物は潤滑
油通路中からよどみなく速やかに流出されるか
ら、潤滑油通路は潤滑油中に含まれる摩耗粉やス
ラツジ等の異物によつて塞がれることがなく、常
に安定した通路断面積を確保することができ、長
期にわたつて安定した適量の潤滑油供給をカム６
ａに対して行うことができるという優れた効果を
奏する。
As explained above, the roller tappet of the fuel injection pump of the present invention is provided with a continuous planar notch 24 that opens to the lower end surface of the roller tappet 3 on the side surface of the roller tappet 3, and the notch 24 is used as a lubricating oil passage. Foreign matter is scraped off by constant relative movement between the notch 24 forming the lubricating oil passage and the inner surface of the guide cylinder 2, and the notch 24 opens toward the lower end surface of the roller tappet 3. This allows the scraped foreign matter to flow out quickly and without stagnation from the lubricating oil passage, so the lubricating oil passage is not blocked by foreign matter such as wear particles and sludge contained in the lubricating oil. , it is possible to always ensure a stable passage cross-sectional area, and the cam 6 provides a stable and appropriate amount of lubricating oil supply over a long period of time.
It has an excellent effect in that it can be applied to a.
第１図は本発明のローラタペツト３を組み込ん
だ燃料噴射ポンプの部分断面図であり、第２図は
本発明のローラタペツト３の第１実施例であり、
ａは正面図、ｂは側面図である。
２……案内シリンダ、３……ローラタペツト、
６ａ……カム、１０……ポンププランジヤ、２４
……切欠部。
FIG. 1 is a partial sectional view of a fuel injection pump incorporating a roller tappet 3 of the present invention, and FIG. 2 is a first embodiment of the roller tappet 3 of the present invention.
A is a front view, and b is a side view. 2... Guide cylinder, 3... Roller tappet,
6a...Cam, 10...Pump plunger, 24
...Notch.
Claims (1)
を往復滑動してポンププランジヤ１０を往復動さ
せる燃料噴射ポンプのローラタペツトにおいて、
ローラタペツト３の側面部分に前記ローラタペツ
ト３の下端面へ開口する連続した切欠部２４を設
け、該切欠部２４を潤滑油の通路とすることを特
徴とする燃料噴射ポンプのローラタペツト。 ２ 前記切欠部２４が平面状である特許請求の範
囲第１項記載の燃料噴射ポンプのローラタペツ
ト。[Claims] 1. In a roller tappet of a fuel injection pump that is driven by a cam 6a and slides back and forth in a guide cylinder 2 to move a pump plunger 10 back and forth,
A roller tappet for a fuel injection pump, characterized in that a continuous notch 24 opening to the lower end face of the roller tappet 3 is provided in a side portion of the roller tappet 3, and the notch 24 is used as a passage for lubricating oil. 2. A roller tappet for a fuel injection pump according to claim 1, wherein the cutout portion 24 is flat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17024383A JPS6062659A (en) | 1983-09-14 | 1983-09-14 | Roller tappet of fuel injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17024383A JPS6062659A (en) | 1983-09-14 | 1983-09-14 | Roller tappet of fuel injection pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6062659A JPS6062659A (en) | 1985-04-10 |
| JPH0214990B2 true JPH0214990B2 (en) | 1990-04-10 |
Family
ID=15901322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17024383A Granted JPS6062659A (en) | 1983-09-14 | 1983-09-14 | Roller tappet of fuel injection pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6062659A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05195907A (en) * | 1992-01-21 | 1993-08-06 | Nippondenso Co Ltd | Fuel injection pump for internal combustion engine |
| JP2588137Y2 (en) * | 1992-12-21 | 1999-01-06 | 株式会社ゼクセル | Fuel injection pump |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5759935B2 (en) * | 1975-06-16 | 1982-12-17 | Yokogawa Electric Works Ltd |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5759935U (en) * | 1980-09-27 | 1982-04-09 |
-
1983
- 1983-09-14 JP JP17024383A patent/JPS6062659A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5759935B2 (en) * | 1975-06-16 | 1982-12-17 | Yokogawa Electric Works Ltd |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6062659A (en) | 1985-04-10 |
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