Balancer apparatus equipped with oil pump

Patent metadata

Field	Value
Publication number	US-11280231-B2
Application number	US-202016650192-A
Country	US
Kind code	B2
Filing date	Feb 21, 2020
Priority date	Sep 18, 2019
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A balancer apparatus equipped with an oil pump includes a pump housing including a pump containing chamber provided therein, a pump forming member contained in the pump containing chamber and configured to discharge oil introduced from an intake portion from a discharge portion to an oil passage of the internal combustion engine when a rotational force is transmitted thereto, a control oil chamber provided between the pump containing chamber and the pump forming member in a radial direction with respect to a rotational axis of the pump forming member and configured to change a hydraulic pressure of the oil to be discharged from the pump forming member with the aid of the oil introduced therein after being discharged from the discharge portion, passing through an oil passage of the internal combustion engine, and being subjected to a pressure adjustment, and a balancer housing including a bearing retainer portion configured to transmit the rotational force from the internal combustion engine to the pump forming member. The bearing retainer portion supports a balancer shaft disposed along the rotational axis of the pump forming member. The balancer housing is attached to the pump housing in a direction of the rotational axis of the pump forming member. The balancer apparatus equipped with the oil pump further includes a plurality of oil passage opening portions formed together on one side surface of the balancer housing and each connected to an oil passage connected to a main oil gallery of the internal combustion engine. The plurality of oil passage opening portions includes a discharge oil passage opening portion of a discharge oil passage connecting the discharge portion and the main oil gallery of the internal combustion engine to each other, a feedback oil passage opening portion of a feedback oil passage connecting the main oil gallery of the internal combustion engine and the control oil chamber to each other, and a bearing oil passage opening portion of a bearing oil passage connecting the main oil gallery of the internal combustion engine and the bearing retainer portion to each other.

First claim

The invention claimed is:

1. A balancer apparatus equipped with an oil pump that is configured to be mounted on an internal combustion engine, the balancer apparatus equipped with the oil pump comprising:
a pump housing including a pump containing chamber provided therein;
a pump forming member contained in the pump containing chamber and configured to discharge oil introduced from an intake portion from a discharge portion to an oil passage of the internal combustion engine when a rotational force is transmitted thereto;
a control oil chamber provided between the pump containing chamber and the pump forming member in a radial direction with respect to a rotational axis of the pump forming member, the control oil chamber being configured to change a hydraulic pressure of the oil to be discharged from the pump forming member with the aid of the oil introduced therein after being discharged from the discharge portion, passing through an oil passage of the internal combustion engine, and being subjected to a pressure adjustment;
a balancer housing including a bearing retainer portion configured to transmit the rotational force from the internal combustion engine to the pump forming member, the bearing retainer portion supporting a balancer shaft disposed along the rotational axis of the pump forming member, the balancer housing being attached to the pump housing in a direction of the rotational axis of the pump forming member; and
a plurality of oil passage opening portions formed together on one side surface of the balancer housing and each connected to an oil passage connected to a main oil gallery of the internal combustion engine, the plurality of oil passage opening portions including a discharge oil passage opening portion of a discharge oil passage connecting the discharge portion and the main oil gallery of the internal combustion engine to each other, a feedback oil passage opening portion of a feedback oil passage connecting the main oil gallery of the internal combustion engine and the control oil chamber to each other, and a bearing oil passage opening portion of a bearing oil passage connecting the main oil gallery of the internal combustion engine and the bearing retainer portion to each other.

2. The balancer apparatus equipped with the oil pump according to claim 1 , wherein the plurality of oil passage opening portions is provided on one side closer to an attachment surface, where the pump housing and the balancer housing are attached to each other, with respect to a left-right central axis of the balancer housing in the direction of the rotational axis of the pump forming member.

3. The balancer apparatus equipped with the oil pump according to claim 2 , wherein the balancer housing includes a first balancer housing and a second balancer housing,
wherein respective oil grooves forming a part of the bearing lubrication oil passage, a part of the feedback oil passage, and a part of the discharge oil passage are formed on an abutment surface between the first balancer housing and the second balancer housing in an order of the oil groove forming the part of the bearing oil passage, the oil groove forming the part of the feedback oil passage, and the oil groove forming the part of the discharge oil passage along the rotational axis of the pump forming member.

4. The balancer apparatus equipped with the oil pump according to claim 1 , wherein the balancer shaft includes
a first balancer shaft configured to receive a rotational force of a crankshaft provided in the internal combustion engine that is transmitted via a driving gear, the first balancer shaft also including a driven gear meshed with the driving gear provided on one side closer to an attachment surface, where the pump housing and the balancer housing are attached to each other, with respect to a left-right central axis of the balancer housing in the direction of the rotational axis of the pump forming member, and
a second balancer shaft disposed between the first balancer shaft and the plurality of oil passage opening portions in the radial direction with respect to the rotational axis of the pump forming member, the second balancer shaft being configured to transmit a rotational force of the first balancer shaft to the pump forming member.

5. The balancer apparatus equipped with the oil pump according to claim 1 , wherein the balancer housing includes
a first balancer housing on a vertically upper side that is attached to the internal combustion engine in the radial direction with respect to the rotational axis of the pump forming member, and
a second balancer housing on a vertically lower side that is attached to the internal combustion engine via the first balancer housing in the radial direction with respect to the rotational axis of the pump forming member.

6. The balancer apparatus equipped with the oil pump according to claim 5 , wherein respective oil grooves forming a part of the discharge oil passage, a part of the feedback oil passage, and a part of the bearing oil passage are formed on an abutment surface between the first balancer housing on the vertically upper side and the second balancer housing on the vertically lower side.

7. The balancer apparatus equipped with the oil pump according to claim 6 , wherein the oil grooves are formed on the abutment surface between the first balancer housing on the vertically upper side and the second balancer housing on the vertically lower side in an order of the oil groove forming the part of the bearing oil passage, the oil groove forming the part of the feedback oil passage, and the oil groove forming the part of the discharge oil passage along the direction of the rotational axis of the pump forming member.

8. The balancer apparatus equipped with the oil pump according to claim 7 , wherein the pump housing is attached to the first balancer housing on the vertically upper side, and
wherein at least one of the discharge oil passage opening portion, the feedback oil passage opening portion, and the bearing oil passage opening portion is provided on the first balancer housing on the vertically upper side.

9. The balancer apparatus equipped with the oil pump according to claim 1 , wherein a hollow cylindrical member is provided in at least one of the discharge oil passage opening portion, the feedback oil passage opening portion, and the bearing oil passage opening portion.

10. The balancer apparatus equipped with the oil pump according to claim 9 , wherein the hollow cylindrical member is press-fitted in each of the discharge oil passage opening portion, the feedback oil passage opening portion, and the bearing oil passage opening portion.

11. The balancer apparatus equipped with the oil pump according to claim 10 , wherein the hollow cylindrical members in two opening portions where a distance between respective centers is the longest, among the discharge oil passage opening portion, the feedback oil passage opening portion, and the bearing oil passage opening portion, are each connected to an oil passage connected to the main oil gallery of the internal combustion engine via a clearance seal, and
wherein the hollow cylindrical member in the remaining one opening portion is connected to an oil passage connected to the main oil gallery of the internal combustion engine via an O-ring.

12. A balancer apparatus equipped with an oil pump, the balancer apparatus equipped with the oil pump being configured to be fixed to an internal combustion engine, the oil pump being attached to the balancer apparatus equipped with the oil pump,
the oil pump including
a pump housing including a pump containing chamber provided therein,
a pump forming member contained in the

Assignees

• Hitachi Astemo Ltd

Inventors

• Kurita Masahumi
• Hirano Takashi
• Kitamura Masaharu

Classifications

• F01M1/02 Primary

  using lubricating pumps (pumps in general F04; lubricating pumps per se F16N) · CPC title

• F01M2011/028

  for lubricating balance shafts · CPC title

• F01M2001/0276

  driven by a balancer shaft · CPC title

• F01M11/02

  Arrangements of lubricant conduits · CPC title

• F16F15/26

  of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system {, i.e. masses connected through a kinematic mechanism or gear system (F16F15/226 takes precedence)} · CPC title