JPH01148081U

JPH01148081U -

Info

Publication number: JPH01148081U
Application number: JP4377488U
Authority: JP
Priority date: 1988-03-31
Filing date: 1988-03-31
Publication date: 1989-10-13
Anticipated expiration: 2003-03-31
Also published as: JP2530846Y2

Description

[Brief explanation of the drawing]

第１〜９図はこの考案の実施例を示し、第１図
は内燃機関の斜視図、第２図はトロコイドポンプ
の組付け状態の概略斜視図、第３図はトロコイド
ポンプの概略正面図、第４図は中間板に逃し孔を
形成した説明図、第５図はトロコイドポンプに逃
し弁機構を装着した一部断面図、第６〜８図は内
、外ロータの回転状態の説明図、第９図ａ，ｂ，
ｃ，ｄ，ｅは油の圧力変化状態を示す図である。
第１０，１１図は従来のトロコイドポンプを示し
、第１０図はトロコイドポンプの概略正面図、第
１１図はシールランド部を大きくした状態の説明
図である。図において、２は内燃機関、１０はクランク軸
、１２はトロコイドポンプ、１８は内ロータ、１
８ａは内歯、２０は外ロータ、２０ａは外歯、２
２はポンプハウジング、３０は吸入ポート、３２
は吐出ポート、３４はシールランド部、３８は中
間板、４０は空間、４２は逃し孔、４４は連絡路
、４８はボール、５０は弾圧用スプリング、そし
て５２は圧力逃し弁機構でる。 1 to 9 show an embodiment of this invention, FIG. 1 is a perspective view of an internal combustion engine, FIG. 2 is a schematic perspective view of the trochoid pump in an assembled state, and FIG. 3 is a schematic front view of the trochoid pump. Fig. 4 is an explanatory diagram of a relief hole formed in the intermediate plate, Fig. 5 is a partial sectional view of a trochoid pump equipped with a relief valve mechanism, and Figs. 6 to 8 are explanatory diagrams of the rotational states of the inner and outer rotors. Figure 9 a, b,
c, d, and e are diagrams showing changes in oil pressure.
10 and 11 show a conventional trochoid pump, FIG. 10 is a schematic front view of the trochoid pump, and FIG. 11 is an explanatory diagram with the seal land portion enlarged. In the figure, 2 is an internal combustion engine, 10 is a crankshaft, 12 is a trochoid pump, 18 is an inner rotor, 1
8a is an internal tooth, 20 is an external rotor, 20a is an external tooth, 2
2 is a pump housing, 30 is a suction port, 32
34 is a discharge port, 34 is a seal land portion, 38 is an intermediate plate, 40 is a space, 42 is a relief hole, 44 is a communication path, 48 is a ball, 50 is a resilient spring, and 52 is a pressure relief valve mechanism.

Claims

[Scope of utility model registration request]

By meshing the inner teeth of the inner rotor and the outer teeth of the outer rotor, which are formed by a trochoid curve, and causing eccentric rotation between the pump plates, a space in which the inner rotor moves while expanding and contracting in the rotational direction of the rotor is created. formed by internal teeth and external teeth of the outer rotor,
In a trochoid pump that sucks fluid through a suction port formed in the pump plate, compresses it, and discharges it from a discharge port formed in the pump plate, the volume of the space in the seal land between the suction port and the discharge port. A pressure relief valve mechanism is provided that communicates the discharge port with a location after the point where the pressure starts to decrease, and that opens the communication passage when the fluid pressure in the space exceeds a predetermined discharge pressure. A trochoid pump featuring