JPH0669382U - Oil pump - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate positioning. [Structure] Bearing portion 1 of drive shaft 3A formed on cover 1
1, the entire bearing member 12 is press-fitted, and the protrusion remaining portion 12A protruding from the end surface 1A of the cover 1 of the bearing member 12 is used as the dimension guide portion of the drive gear 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil pump for lubricating oil used in an engine or the like.

[0002]

[Prior art]

 A cover having a suction port and a discharge port, a casing connected to the cover, a pair of gears arranged inside the cover and the casing, and a drive shaft of the gear protruding outside the casing. In the oil pump having the drive gear mounted on, the boss of the bolt connecting the cover and the casing is secured in order to secure the dimensional accuracy of the center distance between the drive gear that meshes with the drive gear and transmits the power. A part is used as a reamer bolt, or a boss is provided on a portion of the end surface of the cover corresponding to the drive shaft, and the boss is used to position the oil pump.

[0003]

[Problems to be solved by the device]

 In this conventional technique, there is a problem that positioning is complicated in the former case because there are two positions, and in the latter case, it may be difficult to install the boss due to the occurrence of interference on the engine side. However, if the size of the boss is limited even if the boss can be installed, there is a problem that positioning is difficult.

The present invention has been made for the purpose of solving the problems of the prior art.

[0005]

[Means for Solving the Problems]

 Means for solving the above problems will be described below with reference to FIG. 1 corresponding to the embodiment. This invention has a cover 1 having a suction port and a discharge port, a casing 2 connected to the cover 1, a pair of gears 3 and 4 arranged inside the cover 1 and the casing 2, and protruding to the outside of the casing 2. In the oil pump having the drive gear 5 mounted on the drive shaft 3A of the gear 3 that is formed, the entire bearing member 12 is press-fitted into the bearing portion 11 of the drive shaft 3A formed on the cover 1 The protrusion remaining portion 12A protruding from the end surface 1A of the cover 1 is used as a dimension guide portion of the drive gear 5.

[0006]

[Action]

 In such a structure, positioning is performed by inserting the protrusion remaining portion 12A of the bearing member 12 into a groove formed in the engine block as a dimension guide portion of the drive gear 5.

[0007]

【Example】

 FIG. 1 is a diagram showing an embodiment of this invention. In FIG. 1, 1 is a cover having a suction port and a discharge port, 2 is a casing connected to the cover 1, and 3 and 4 are a pair of gears that are arranged inside the cover 1 and the casing 2 and constitute a pump gear. Reference numeral 5 is a drive gear that is mounted on the drive shaft 3A of the drive-side gear 3 that constitutes the pump gear and that is projected to the outside of the casing 2. Reference numeral 11 is a bearing portion of the drive shaft 3A formed in the cover 1; It is a member.

The bearing portion 11 is a hole into which the bearing member 12 is fitted, and its diameter is formed larger than the diameter of the drive shaft 3A. The bearing member 12 is a bush for a slide bearing, the length of which is larger than the thickness of the cover 1 and is a clinch shape in which both ends of the circumference do not overlap. The reason why the length of the bearing member 12 is made larger than the thickness of the cover 1 is that the projection remaining portion 12A protruding from the end surface 1A of the cover 1 after being press-fitted into the bearing portion 11 serves as a dimension guide portion. The both ends of the circumference are made into a linch shape, because if both ends of the circumference overlap, the degree of freedom in the radial direction of the bearing member 12 is lost and it is difficult to obtain dimensional accuracy. The bearing member 12 is press-fitted into the bearing portion 11, and the protrusion remaining portion 12A acts as a dimension guide portion of the drive gear 5. That is, the oil pump is positioned by inserting the protrusion remaining portion 12A into a groove formed in an engine block (not shown). In this way, positioning is easy. Inside the bearing member 12, the drive shaft 3A of the drive gear 3 is mounted.

Although the bearing portion 11 is formed at the drive shaft 3A of the drive side gear 3 constituting the pump gear, the bearing portion 11 is formed at the driven shaft 4A of the driven side gear 4 constituting the pump gear. Even if done, the same action and effect can be obtained.

[0010]

[Effect of device]

 As described above, the present invention has a cover having a suction port and a discharge port, a casing connected to the cover, a pair of gears arranged inside the cover and the casing, and a casing of the casing. In an oil pump having a drive gear mounted on the drive shaft of the gear protruding to the outside, the entire bearing member is press-fitted into a bearing portion of the drive shaft formed in the cover, and the bearing member The protrusion remaining portion protruding from the end surface of the cover is used as a dimension guide portion of the drive gear. Therefore, positioning is performed by inserting the protrusion remaining portion of the bearing member into the groove formed in the engine block. Therefore, according to this invention, it is possible to obtain an effect that positioning is easy.

[Brief description of drawings]

1A and 1B are views showing an embodiment of the present invention, in which FIG. 1A is a front view and FIG. 1B is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 Cover 2 Casing 5 Drive Gear 11 Bearing 12 Bearing Member

Claims (2)

[Scope of utility model registration request] 1. A cover having a suction port and a discharge port, a casing connected to the cover, a pair of gears arranged inside the cover and the casing, and the casing protruding outside the casing. In an oil pump having a drive gear mounted on a drive shaft of a gear, the entire bearing member is press-fitted into a bearing portion of the drive shaft formed in the cover, and the bearing member protrudes from an end surface of the cover. An oil pump characterized in that the remaining projection is used as a dimension guide for the drive gear. 2. A cover having a suction port and a discharge port, a casing connected to the cover, a pair of gears arranged inside the cover and the casing, and the casing protruding outside the casing. In an oil pump having a drive gear mounted on a driven shaft of a gear, the entire bearing member is press-fitted into a bearing portion of the driven shaft formed on the cover and protruded from an end surface of the cover of the bearing member. An oil pump characterized in that the remaining projection is used as a dimension guide for the drive gear.