Manufacturing method of rotating machinery

Abstract

To improve positioning.SOLUTION: A method for manufacturing a pump 1 comprises: setting bolt fastening points A1, A3 out of a plurality of bolt fastening points A as a plurality of positioning fastening points A1, A3 formed so that positioning holes B2 between a body 3 and a pump cover 4 also serve as bolt insertion holes; inserting a positioning pin P into the positioning holes B2 at the plurality of positioning fastening points A1, A3; positioning the pump cover 4 to the body 3; in a state where the pump cover 4 is positioned to the body 3 by the positioning pin P, fastening the bolt fastening points A other than the plurality of positioning fastening points A1, A3 with bolts; and removing the positioning pin P and fastening the plurality of positioning fastening points A1, A3 with bolts.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a rotating machine.

Background Art

[0002] Patent Document 1 discloses a gear pump having a case, a cover bolted to the case, a shaft rotatably supported between the case and the cover via a bush, and a knock pin engaged with the case and the cover.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a knock pin is used for positioning the cover, the component cost increases due to the knock pin. In addition, a press-fitting process for the knock pin is required, and it is necessary to secure a space for installing the pin hole of the knock pin.

[0005] The present invention has been made in view of such problems, and an object thereof is to improve positioning.

Means for Solving the Problems

[0006] The present invention has a housing, a cover positioned and bolted to the housing, and a shaft rotatably supported from the housing to the cover, and the housing and the cover are a method for manufacturing a rotating machine having three or more bolt fastening locations, and among the plurality of bolt fastening locations, some bolt fastening locations, at least two bolt fastening locations, are formed as a plurality of positioning fastening locations in which the positioning holes between the housing and the cover also serve as bolt insertion holes. The positioning hole has an inner diameter larger than the threaded hole through which the bolt is fastened.Positioning holes at multiple positioning fastening points So that it abuts against the inner circumference The method is characterized by inserting a positioning pin to position the cover on the housing, then, with the cover positioned on the housing by the positioning pin, bolting the bolt fastening points other than the multiple positioning fastening points, removing the positioning pin, and then bolting the multiple positioning fastening points.

[0007] According to this invention, since a positioning pin is used as a jig for positioning, the rotating machine does not need to have a positioning pin, thus reducing costs. Furthermore, since the positioning pin as a jig is removed after being inserted into the positioning hole, a press-fitting process is also unnecessary. In addition, since the positioning hole is integrated with the bolt insertion hole, there is no need to secure space for installing the positioning hole. Therefore, a positioning configuration that is advantageous in terms of cost, manufacturing, and space can be obtained, and positioning can be improved.

[0008] Furthermore, the present invention is characterized in that the plurality of positioning fastening points include two positioning fastening points arranged opposite each other with respect to the shaft.

[0009] According to this invention, since the two positioning fastening points are distributed in the circumferential direction, deterioration of the balance of the bolt's axial force can be suppressed.

[0010] Furthermore, the present invention is characterized in that the rotating machine is a hydraulic rotating machine and a flow path is formed in the cover.

[0011] According to this invention, the positioning pins prevent the cover from shifting position, thus suppressing liquid leakage from the flow path. [Effects of the Invention]

[0012] These inventions make it possible to improve positioning. [Brief explanation of the drawing]

[0013] [Figure 1] This is a side view of a pump according to an embodiment of the present invention. [Figure 2] This is a plan view of a pump according to an embodiment of the present invention. [Figure 3] This is an explanatory diagram of the pump manufacturing method. [Modes for carrying out the invention]

[0014] Embodiments of the present invention will be described below with reference to the attached drawings.

[0015] Figure 1 is a side view of pump 1. Pump 1 is a rotating machine, a hydraulic rotating machine that pressurizes and discharges hydraulic oil as the working fluid. Pump 1 is driven by a drive source such as an engine or an electric motor. Pump 1 can be a vane pump, piston pump, gear pump, or any other type of pump that sucks in hydraulic oil stored in a tank, increases the pressure of the sucked-in hydraulic oil, and discharges it. In this embodiment, the case where pump 1 is a vane pump will be described.

[0016] Pump 1 comprises a pump mechanism 2, a body 3 housing the pump mechanism 2, and a pump cover 4 closing the opening of the body 3. Pump mechanism 2 comprises a drive shaft 2s to which power from a drive source is transmitted, a rotor 2r connected to the drive shaft 2s and rotationally driven by the power from the drive source, a plurality of vanes 2v provided to reciprocate radially with respect to the rotor 2r, and a cam ring 2c housing the rotor 2r and having an inner circumferential cam surface on which the tips of the vanes 2v slide as the rotor 2r rotates.

[0017] Body 3 has a housing recess 3a for housing the pump mechanism 2. A cam ring 2c housing the rotor 2r and vanes 2v is housed in the housing recess 3a. Body 3 and pump cover 4 have insertion holes 3b and 4a for the drive shaft 2s. The drive shaft 2s is inserted sequentially into the insertion hole 4a of the pump cover 4, the rotor 2r, and the insertion hole 3b of the body 3, and is connected to the rotor 2r. Body 3 corresponds to the housing.

[0018] The drive shaft 2s is a shaft and is rotatably supported from the body 3 to the pump cover 4. The drive shaft 2s is rotatably supported by the body 3 via a bush 5 provided in the insertion hole 3b and is rotatably supported by the pump cover 4 via a bush 6 provided in the insertion hole 4a.

[0019] Note that a seal member (not shown) is provided between the insertion hole 4a of the pump cover 4 and the drive shaft 2s on the tip side (upper side in FIG. 1) of the drive shaft 2s with respect to the bush 6. The drive shaft 2s may be directly supported by the body 3 or the pump cover 4 without passing through the bush 5 or the bush 6.

[0020] On the surface of the pump cover 4 where the rotor 2r slides, two arcuate suction ports 4b and 4c that open corresponding to the suction region of the cam ring 2c are formed in a groove shape. Inside the cam ring 2c, a plurality of pump chambers (not shown) are formed by the outer peripheral surface of the rotor 2r, the inner peripheral cam surface of the cam ring 2c, and adjacent vanes 2v. The suction ports 4b and 4c are connected to the tank via a tank passage (not shown), and the hydraulic oil is led into the pump chamber through the suction ports 4b and 4c.

[0021] The pump mechanism 2 sucks hydraulic oil into the pump chamber as the rotor 2r rotates, increases the pressure of the sucked hydraulic oil, and discharges it to the high-pressure chamber 3c. The high-pressure chamber 3c is formed in an annular shape at the bottom of the accommodation recess 3a and is connected to a fluid pressure device (not shown) outside the pump 1, such as a power steering device or a transmission, via a discharge passage (not shown).

[0022] On one side (the upper side in FIG. 1) of the rotor 2r and the cam ring 2c of the pump mechanism 2, the pump cover 4 is arranged to abut, and on the other side (the lower side in FIG. 1), the side plate 7 is arranged to abut. The pump cover 4 and the side plate 7 are arranged in a state of sandwiching both sides of the rotor 2r and the cam ring 2c, and seal the pump chamber. On the pump cover 4, one side of the rotor 2r is in sliding contact, and one side of the cam ring 2c abuts. The side plate 7 is provided between the bottom of the accommodation recess 3a and the rotor 2r. On the side plate 7, the other side of the rotor 2r is in sliding contact, and the other side of the cam ring 2c abuts.

[0023] On the side plate 7, two discharge ports 7a, 7b for guiding the hydraulic oil from the pump chamber to the high-pressure chamber 3c are formed. The discharge ports 7a, 7b have an arc shape that opens corresponding to the discharge region of the cam ring 2c, and discharge the hydraulic oil discharged from the pump chamber to the high-pressure chamber 3c.

[0024] Two positioning pins (not shown) are provided on the pump cover 4, the cam ring 2c, and the side plate 7. By the positioning pins, the relative rotation of the pump cover 4 and the side plate 7 with respect to the cam ring 2c is restricted, and the positioning of the suction region of the cam ring 2c and the suction ports 4b, 4c of the pump cover 4, and the positioning of the discharge region of the cam ring 2c and the discharge ports 7a, 7b of the side plate 7 are performed.

[0025] The side plate 7, the rotor 2r, and the cam ring 2c are accommodated in the accommodation recess 3a. In this state, by attaching the pump cover 4 to the body 3 with bolts 8, the accommodation recess 3a is sealed. The pump 1 has a plurality of bolt fastening points A as described below.

[0026] Figure 2 is a plan view of pump 1. As shown in Figure 2, pump 1 has a total of four bolt fastening points A, from A1 to A4. Bolt fastening points A are the bolt fastening points between the body 3 and the pump cover 4. At each bolt fastening point A, the pump cover 4 is bolted to the body 3 by inserting a bolt 8 through the pump cover 4 and tightening it to the body 3.

[0027] The two bolt fastening points A1 and A3 are positioned opposite each other, with the drive shaft 2s in between. Therefore, the two bolt fastening points A1 and A3 are dispersed in the circumferential direction. In addition, the distance between bolt fastening points A1 and A3 (straight-line distance) is longer than the distance between bolt fastening points A1 and A2, and the distance between bolt fastening points A1 and A4. Bolt fastening points A1 and A3 are designated as positioning fastening points, as will be explained next using Figure 3.

[0028] Figure 3 is an explanatory diagram of the manufacturing method of pump 1. Figure 3 describes the assembly process of pump cover 4, which has three steps, from the first to the third, shown from top to bottom in Figure 3.

[0029] First, let's further explain bolt fastening location A. Bolt fastening locations A2 and A4 (see the second step in the center of Figure 3) have a bolt insertion hole B1 and a threaded hole C. The bolt insertion hole B1 is formed in the body 3 and the pump cover 4. The bolt insertion hole B1 is a normal bolt insertion hole and is made by casting. Therefore, the bolt insertion hole B1 does not have high machining accuracy as a positioning hole. A female thread is formed in the threaded hole C, and the bolt 8 is tightened into it. Note that the bolt insertion hole B1 may be formed only in the pump cover 4.

[0030] Bolt fastening points A1 and A3 have a positioning hole B2 and a threaded hole C. In other words, bolt fastening points A1 and A3 differ from bolt fastening points A2 and A4 in that they have a positioning hole B2 instead of a bolt insertion hole B1. Note that in Figure 3, for the sake of explanation, the diameter of the positioning hole B2 is exaggerated to be larger than that of the bolt insertion hole B1.

[0031] Positioning hole B2 is a positioning hole between the body 3 and the pump cover 4, and has high machining accuracy for positioning. Bolt fastening locations A1 and A3, where positioning hole B2 is formed, are multiple positioning fastening locations in which positioning hole B2 also serves as a bolt insertion hole. Hereafter, bolt fastening locations A1 and A3 will also be referred to as positioning fastening locations A1 and A3.

[0032] Next, the assembly process for the pump cover 4 will be described. The pump cover 4 is assembled to the body 3 using an assembly device (not shown). The assembly device is an automatic assembly device and includes a cover setting device that supplies and sets the pump cover 4 to the body 3, a positioning device that performs positioning using a positioning pin P (see the second step in the center of Figure 3), and a screw tightening machine that can fasten bolts at multiple bolt fastening points A.

[0033] The screw tightening machine comprises a screw tightening machine body that performs bolt fastening, a moving device such as a robot that moves and seats the screw tightening machine body to predetermined bolt fastening locations A, and a bolt supply device that supplies bolts 8 to the screw tightening machine body. The screw tightening machine may be a single-axis configuration or a multi-axis configuration.

[0034] In the first step, the cover setting device sets the pump cover 4 onto the body 3. In the first step, by setting the pump cover 4 onto the body 3, the position of the pump cover 4 relative to the body 3 is roughly aligned.

[0035] In the second step, the positioning device uses positioning pins P to position the pump cover 4 onto the body 3. The positioning pins P are installed in the positioning device as a positioning jig. In other words, the positioning pins P are not a component of the pump 1. Therefore, the pump 1 does not require positioning pins to position the pump cover 4 onto the body 3, thus reducing component costs.

[0036] Multiple positioning pins P (two in this case) are provided, corresponding to the positioning fastening points A1 and A3. Each positioning pin P is movable between a positioning position and a retracted position (not shown) by a positioning device, and is also movable in the vertical direction. The positioning position is the position of the positioning pin P corresponding to the positioning fastening points A1 and A3, and the retracted position is the position where the pin is retracted from the positioning fastening points A1 and A3. The retracted position constitutes the fixed position of the positioning pin P in the assembly device.

[0037] Therefore, in the second step, each of the two positioning pins P moves from its retracted position to its respective positioning position and descends toward the corresponding positioning hole B2. As a result, the positioning pins P are inserted into the positioning holes B2 at multiple positioning fastening points A1 and A3, and the pump cover 4 is positioned on the body 3. The pump cover 4 is positioned on the body 3 at two points.

[0038] As described above, with the pump cover 4 positioned on the body 3 by the positioning pin P, in the second step, the screw tightening machine body, which was in a fixed position, is further set at bolt fastening locations A2 and A4 by the moving device. Bolts 8 are also supplied to the screw tightening machine body from the bolt supply device, and the screw tightening machine body fastens the bolt fastening locations A2 and A4 by tightening the supplied bolts 8.

[0039] As a result, with the pump cover 4 positioned on the body 3 by the positioning pin P, the bolt fastening points A other than the positioning fastening points A1 and A3 (i.e., bolt fastening points A2 and A4) are bolted. In the case of a single-axis screw fastening machine, bolt fastening points A2 and A4 can be fastened by sequentially bolting them with the screw fastening machine body. In the case of a multi-axis screw fastening machine, bolt fastening points A2 and A4 can be bolted simultaneously with the screw fastening machine body.

[0040] As described above using Figure 2, the two positioning fastening points A1 and A3 are positioned opposite each other with the drive shaft 2s in between, and as a result they are spaced far apart in the radial direction.

[0041] Therefore, when bolting the pump cover 4 to the body 3 in the second step, even if the pump cover 4 shifts within the range of play at the positioning fastening points A1 and A3, the displacement of the pump cover 4 can be suppressed.

[0042] Furthermore, as described above, by suppressing the misalignment of the pump cover 4, leakage of hydraulic fluid and deterioration of pulsation can be suppressed when determining port timing at the suction ports 4b and 4c. The suction ports 4b and 4c correspond to the flow paths.

[0043] In the third step, the positioning device removes the positioning pin P, and then the screw tightening machine bolts the multiple positioning fastening points A1 and A3. For example, after the bolting of fastening points A2 and A4 is completed, the positioning pin P is raised by the positioning device while the screw tightening machine body remains seated on at least one of fastening points A2 and A4. In this case, when removing the positioning pin P from the positioning hole B2, the screw tightening machine body can hold down the product (pump 1 being manufactured), preventing the product from being lifted by the positioning pin P. The positioning pin P may be raised by a method other than that described above.

[0044] The raised positioning pin P is moved to a retracted position by the positioning device, and after the positioning pin P has moved to the retracted position, the screw tightening machine body is set at the positioning fastening points A1 and A3 by the moving device. This prevents interference between the screw tightening machine and the positioning pin P.

[0045] In the second step, the bolts at bolt fastening points A2 and A4 are fastened, so in the third step, the pump cover 4 is already fixed in position on the body 3. Therefore, in the third step, the screw tightening machine body, which is set at positioning fastening points A1 and A3, can tighten the bolts 8 without causing any misalignment of the pump cover 4. After fastening at positioning fastening points A1 and A3 is complete, the screw tightening machine body returns to its original position, thus completing the series of automatic cycles of the assembly device.

[0046] In pump 1, the pump cover 4 is positioned and bolted to the body 3 in this manner, which suppresses tilting of the drive shaft 2s supported by the body 3 and the pump cover 4, thereby suppressing the deterioration of vibration and noise in pump 1.

[0047] As mentioned above, in pump 1, the two positioning fastening points A1 and A3 are positioned opposite each other with the drive shaft 2s in between, and as a result they are distributed in the circumferential direction.

[0048] Therefore, the positioning hole B2 does not necessarily need to have a larger diameter than the normal bolt insertion hole B1. However, even if the larger diameter of the positioning hole B2 reduces the bolt seating surface and slightly lowers the axial force of the bolt 8, it is possible to suppress the deterioration of the axial force balance. In addition, the axial force can be increased by increasing the fastening length between the bolt 8 and the threaded hole C at the two positioning fastening points A1 and A3. However, by distributing the bolts as described above, it becomes possible to use the same bolt 8 at multiple bolt fastening points A.

[0049] Furthermore, some or all of the manufacturing method of the pump 1 embodied by the assembly device may be performed by a person. Also, the manufacturing method of the pump 1 may be applied to other rotating machines such as motors. The multiple bolt fastening points A may be three or more multiple bolt fastening points A, and the multiple positioning fastening points A1, A3 may be at least two of the multiple bolt fastening points A.

[0050] The configuration, operation, and effects of the embodiments of the present invention will be described below.

[0051] The manufacturing method for the pump 1 comprises a body 3, a pump cover 4 positioned and bolted to the body 3, and a drive shaft 2s rotatably supported from the body 3 to the pump cover 4, wherein the body 3 and the pump cover 4 have a plurality of bolt fastening points A, wherein the bolt fastening points A1 and A3 of the plurality of bolt fastening points A are formed such that the positioning holes B2 of the body 3 and the pump cover 4 also serve as bolt insertion holes, and a positioning pin P is inserted into the positioning holes B2 at the plurality of position fastening points A1 and A3 to position the pump cover 4 on the body 3, and with the pump cover 4 positioned on the body 3 by the positioning pin P, the bolt fastening points A other than the plurality of position fastening points A1 and A3 are bolted, the positioning pin P is removed and the plurality of position fastening points A1 and A3 are bolted.

[0052] With this configuration, since the positioning pin P is used as a jig for positioning, the pump 1 does not need to have the positioning pin P, thus reducing costs. Also, since the positioning pin P is removed after being inserted into the positioning hole B2, the press-fitting process is also unnecessary. Furthermore, since the positioning hole B2 is integrated with the bolt insertion hole, there is no need to secure space for installing the positioning hole B2. Therefore, a positioning configuration that is advantageous in terms of cost, manufacturing, and space is obtained, and positioning can be improved.

[0053] The multiple positioning fastening points A1, A3 include two positioning fastening points A1, A3 that are arranged opposite each other with the drive shaft 2s in between. In this embodiment, the multiple positioning fastening points A1, A3 are represented as two positioning fastening points A1, A3.

[0054] With this configuration, the two positioning fastening points A1 and A3 are distributed in the circumferential direction, which helps to suppress the deterioration of the axial force balance of the bolt 8.

[0055] Pump 1 is a hydraulic rotary pump, and the pump cover 4 has suction ports 4b and 4c formed as flow paths.

[0056] With this configuration, the positioning pin P suppresses misalignment of the pump cover 4, thereby preventing leakage of hydraulic fluid and deterioration of pulsation when determining port timing at the suction ports 4b and 4c.

[0057] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. [Explanation of Symbols]

[0058] 1...Pump, 2...Pump mechanism, 2s...Drive shaft, 3...Body (housing), 4...Pump cover, 4b,4c...Suction port (flow path), 8...Bolt, A,A1~A4...Bolt fastening points, A1,A3...Positioning fastening points, B2...Positioning hole, P...Positioning pin

Claims

1. A method for manufacturing a rotating machine comprising a housing, a cover positioned and bolted to the housing, and a shaft rotatably supported from the housing to the cover, wherein the housing and the cover have three or more bolt fastening points, Of the aforementioned multiple bolt fastening locations, at least two of the bolt fastening locations are configured as multiple positioning fastening locations in which the positioning holes in the housing and the cover also serve as bolt insertion holes. The positioning hole has an inner diameter larger than the threaded hole through which the bolt is fastened. Positioning pins are inserted at the plurality of positioning fastening locations so as to abut against the inner circumference of the positioning holes, thereby positioning the cover on the housing. With the cover positioned on the housing by the positioning pin, the bolt fastening locations other than the plurality of positioning fastening locations are bolted together. The positioning pin is removed and the multiple positioning fastening points are bolted together. A method for manufacturing a rotating machine, characterized by the following features.

2. A method for manufacturing a rotating machine according to claim 1, The plurality of positioning fastening points include two positioning fastening points arranged opposite each other with respect to the shaft, A method for manufacturing a rotating machine, characterized by the following features.

3. A method for manufacturing a rotating machine according to claim 2, The aforementioned rotating machine is a hydraulic rotating machine, and a flow path is formed in the cover. A method for manufacturing a rotating machine, characterized by the following features.

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