MOTOR

Abstract

An engine (1) includes a cylinder block (2) including a cylinder liner (12) which has a cylindrical shape and forms a cylinder (11) extending in an up-down direction; and a cylinder liner cooling jacket (13) through which a coolant flows and which is formed around the cylinder liner. An inlet port (14A) and an outlet port (14B) are formed in an upper section of the cylinder liner cooling jacket, the inlet port being configured to introduce the coolant into the cylinder liner cooling jacket, and the outlet port being configured to discharge the coolant from the cylinder liner cooling jacket. A drain port (14C) is formed in a lower section of the cylinder liner cooling jacket, the drain port being configured to discharge the coolant from the cylinder liner cooling jacket to drain the cylinder liner cooling jacket.The cross-sectional area of ​​the flow path at the drain port is smaller than the cross-sectional areas of the flow path at the inlet port and the outlet port.

Description

TECHNICAL AREA

[0001] The present invention relates to a motor. STATE OF THE ART

[0002] Patent literature 1 discloses an engine comprising a cylinder block in which a cylinder liner (cylinder bore) of each of a plurality of cylinders extending in an up-down direction is surrounded by a water jacket. A coolant, used to cool the cylinder bore during engine operation, flows through the water jacket. List of oppositions patent literature

[0003] Patent literature 1: JP 5939176 B BRIEF DESCRIPTION OF THE INVENTION Technical Problem

[0004] With this type of engine, the cylinder liner must be adequately cooled during engine operation, and it must also be possible to drain coolant from the water jacket to empty the water jacket when the engine is stored for an extended period of time.

[0005] The present invention was developed with regard to such a problem and one of its objectives is to provide a motor that makes it possible to adequately cool a cylinder liner and to drain coolant from a water jacket in order to empty the water jacket. Solution to the problem

[0006] An engine according to a first aspect of the present disclosure includes a cylinder block which includes: a cylinder liner having a cylindrical shape, wherein the cylinder liner forms a cylinder extending in an up-down direction;and a cylinder liner cooling jacket through which a coolant flows, wherein the cylinder liner cooling jacket is formed around the cylinder liner, wherein an inlet port and an outlet port are formed in an upper section of the cylinder liner cooling jacket, the inlet port being configured to introduce the coolant into the cylinder liner cooling jacket, the outlet port being configured to discharge the coolant from the cylinder liner cooling jacket, a drain port being formed in a lower section of the cylinder liner cooling jacket, the drain port being configured to discharge the coolant from the cylinder liner cooling jacket in order to drain the cylinder liner cooling jacket, and a flow path cross-sectional area of ​​the drain port being smaller than the flow path cross-sectional areas of the inlet port and the outlet port. Advantageous effects of the invention

[0007] According to the present invention, it is possible to adequately cool the cylinder liner and to drain the coolant from the liner cooling jacket (water jacket) in order to empty the liner cooling jacket. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a representation that schematically illustrates a configuration of a motor system including a motor according to an embodiment of the present disclosure. Fig. Figure 2 is a representation illustrating a side surface of the engine according to an embodiment of the present disclosure. Fig. Figure 3 is a side cross-sectional view showing a section of the engine in Fig. 2 is removed. Fig. 4 is a cross-sectional view along IV-IV in Fig. 3. Fig. 5 is a cross-sectional view along VV in Fig. 3. Fig. 6 is a cross-sectional view along VI-VI in Fig. 4 and Fig. 5. Fig. Figure 7 is a representation that schematically illustrates a part of a cylinder block of the engine according to an embodiment of the present invention, wherein the part is a section through which a coolant flows. DESCRIPTION OF EXECUTION FORMS

[0008] Below, an engine according to one embodiment of the present invention is described with reference to Fig. 1 to 7 are described in detail. As in Fig. As illustrated in Figure 1, a motor 1 according to the present embodiment is enclosed in a motor system 100. This motor system 100 can be mounted in any work vehicle, such as a dump truck, a wheel loader, and a motor grader.

[0009] The motor system 100 includes the motor 1, a pump 101, a cooler 102 and a thermostat 103. Motor

[0010] First, motor 1 is described. Fig. 2 to 7 indicate an up-down direction of motor 1 and a Z-axis direction. Furthermore, in Fig. In columns 2 to 6, a first straight direction perpendicular to the Z-axis direction indicates an X-axis direction. Furthermore, a second straight direction perpendicular to both the Z-axis and the X-axis direction indicates a Y-axis direction.

[0011] As in Fig. As illustrated in Figure 2, the engine 1 according to the present embodiment includes a cylinder block 2, a cylinder head 3, a rocker arm housing 4 and an oil pan 5. Cylinder block

[0012] As in Fig. As illustrated in Figure 3, a cylinder 11 is formed inside the cylinder block 2. The cylinder 11 is a chamber extending in an up-down direction (Z-axis direction) and opening into an upper surface 2a of the cylinder block 2. One upper end of the cylinder 11 is covered by the cylinder head 3. A piston 6 is located inside the cylinder 11. The piston 6 is pressurized by the combustion gas burned in the cylinder 11 and moves back and forth in the up-down direction. A chamber of the cylinder 11, located on the upper side of the piston 6, functions as a combustion chamber 11A.

[0013] A number of the cylinders 11 are arranged at intervals in the first straight-line direction (X-axis direction). In the example illustrated in the drawing, the number of cylinders 11 is six. However, the number is not limited to this. Cylinder liner cooling jacket

[0014] As in Fig. As illustrated in Figures 4 to 6, the cylinder block 2 includes a cylinder liner 12 and a cylinder liner cooling jacket 13. The cylinder liner 12 is shaped to be cylindrical, forming the cylinder 11. An upper end of the cylinder liner 12 is exposed at the upper surface 2a of the cylinder block 2. The cylinder liner cooling jacket 13 is a cylindrical space formed around the cylinder liner 12. Coolant flows through the cylinder liner cooling jacket 13.

[0015] In Fig. 6 and Fig. 7 is the upper end of the cylinder liner cooling jacket 13 positioned lower than the upper end of the cylinder liner 12 (the upper surface 2a of the cylinder block 2). Note that the upper end of the cylinder liner cooling jacket 13 can, for example, be located at the upper end of the cylinder liner 12.

[0016] In Fig. 6 is a lower end of the cylinder liner cooling jacket 13 positioned higher than a lower end of the cylinder liner 12. It should be noted that the lower end of the cylinder liner cooling jacket 13 can be located at the lower end of the cylinder liner 12, as for example in Fig. 7 illustrates. Inlet connection and outlet connection

[0017] As in Fig. 6 and Fig. As illustrated in Figure 7, an inlet port 14A and an outlet port 14B are formed in an upper section of the cylinder liner cooling jacket 13. The inlet port 14A is configured to introduce coolant into the cylinder liner cooling jacket 13. The outlet port 14B is configured to discharge the coolant from the cylinder liner cooling jacket 13. The coolant flows primarily through the inlet port 14A and the outlet port 14B when the cylinder liner 12 is being cooled by the coolant.

[0018] The upper section of the cylinder liner cooling jacket 13 is a section of the cylinder liner cooling jacket 13 which is defined such that, if a reference position is the positions of the inlet port 14A and the outlet port 14B in the up-down direction, a length from the reference position to the lower end of the cylinder liner cooling jacket 13 is longer than a length from the reference position to the upper end of the cylinder liner cooling jacket 13.

[0019] For example, the inlet port 14A and the outlet port 14B are preferably positioned at least in a region from the upper end of the cylinder liner cooling jacket 13 to a position where the dimension of the cylinder liner cooling jacket 13 in the up-down direction (the up-down dimension of the jacket) is half. It is preferred that the positions of the inlet port 14A and the outlet port 14B are closer to the upper end of the cylinder liner cooling jacket 13. For example, it is more preferred that the inlet port 14A and the outlet port 14B are arranged in a region from the upper end of the cylinder liner cooling jacket 13 to a position at one-third of the up-down dimension of the jacket, and it is even more preferred that these ports are arranged in a region from the upper end of the cylinder liner cooling jacket to a position at one-quarter of the up-down dimension of the jacket.

[0020] In Fig. 6 and Fig. 7 The inlet port 14A and the outlet port 14B are positioned lower than the upper end of the cylinder liner cooling jacket 13. However, these ports can be positioned, for example, at the upper end of the cylinder liner cooling jacket 13. Drainage connection

[0021] A drain port 14C is formed in a lower section of the cylinder liner cooling jacket 13. The drain port 14C is designed to discharge the coolant from the cooling jacket 13 in order to drain the cooling jacket 13 when the engine 1 is stored for an extended period. Therefore, the position of the drain port 14C is preferably closer to the lower end of the cylinder liner cooling jacket 13. Fig. 6 and Fig. 7 The drain port 14C is positioned higher than the lower end of the cylinder liner cooling jacket 13. However, the drain port can, for example, be positioned at the lower end of the cylinder liner cooling jacket 13.

[0022] As in Fig. As illustrated in Figure 7, the flow path cross-sectional area S3 of the drain port 14C is smaller than the flow path cross-sectional areas S1 and S2 of the inlet port 14A and the outlet port 14B.

[0023] As in Fig. 4 and Fig. As illustrated in Figure 5, the cylinder liner 12 and the cylinder liner cooling jacket 13 correspond to individual cylinders 11. That is, the cylinder block 2 includes a plurality of pairs of cylinder liners 12 and cylinder liner cooling jackets 13. In the present embodiment, the plurality of pairs of cylinder liners 12 and cylinder liner cooling jackets 13 are arranged multiple times at intervals in the first straight-line direction (direction of the X-axis), as with the cylinders 11.

[0024] As in Fig. As illustrated in Figure 4, the inlet port 14A and the outlet port 14B are formed in the plurality of cylinder liner cooling jackets 13.

[0025] As in Fig. As illustrated in Figure 5, the drain port 14C is only formed in a cylinder liner cooling jacket 13A. Fig. 5 The drain port 14C is formed in the cylinder liner cooling jacket 13A, which is arranged in the middle section of the plurality of cylinder liner cooling jackets 13 in one arrangement direction (X-axis direction). However, this port can, for example, be formed in the cylinder liner cooling jacket 13 which is arranged in an end section of the plurality of cylinder liner cooling jackets 13 in the arrangement direction. Connecting flow path

[0026] As in Fig. As illustrated in Figures 5 to 7, the cylinder block 2 includes a connecting flow path 21 configured to connect the lower sections of adjacent cylinder liner cooling jackets 13. Specifically, the connecting flow path 21 connects the lower sections of the cylinder liner cooling jackets 13 that are adjacent to each other in the first straight-line direction (direction of the X-axis). In this way, the plurality of cylinder liner cooling jackets 13 are connected to each other by the connecting flow path 21.

[0027] The connecting flow path 21 has the function of causing the coolant to flow from the cylinder liner cooling jacket 13, which does not have the drain port 14C, towards the cylinder liner cooling jacket 13, which does have the drain port 14C, when the coolant is discharged from the plurality of cylinder liner cooling jackets 13 to drain the plurality of cylinder liner cooling jackets 13. Thus, it is preferred that the position of the connecting flow path 21 is closer to the lower end of the cylinder liner cooling jacket 13. Fig. 7 The connecting flow path 21 is spaced upwards from the lower end of the cylinder liner cooling jacket 13. However, the flow path can, for example, be located at the lower end of the cylinder liner cooling jacket 13. Furthermore, in Fig. 7 The connecting flow path 21 is arranged in the up-down direction at the same height as the drain connection 14C. However, the flow path can, for example, be arranged higher than the drain connection 14C.

[0028] As in Fig. As illustrated in Figure 7, the cross-sectional area S4 of the connecting flow path 21 is larger than the cross-sectional area S3 of the drain port 14C. Furthermore, the cross-sectional area S4 of the connecting flow path 21 is smaller than the cross-sectional areas S1 and S2 of the inlet port 14A and the outlet port 14B. Inlet flow path

[0029] As in Fig. 1, Fig. 4 and Fig. As illustrated in Figure 6, an inlet flow path 22 is formed in the cylinder block 2, which is used to introduce the coolant into the cylinder liner cooling jacket 13. The inlet flow path 22 according to the present embodiment includes a main inlet flow path 221 and a plurality of branch inlet flow paths 222.

[0030] The main inlet flow path 221 extends in a straight line in the first straight direction. The main inlet flow path 221 is arranged on one side of the plurality of cylinder liner cooling jackets 13 in the second straight direction (side of the negative Y-axis direction), with a space provided between them. An upstream end of the main inlet flow path 221 opens to the outside of the cylinder block 2. Fig. 4 is the upstream end of the main inlet flow path 221 in an end section of the cylinder block 2 on one side in the first straight direction (side of the negative X-axis direction). A connecting line 111, extending to the pump 101, which will be described later, is coupled to the upstream end of the main inlet flow path 221. This allows the coolant from the pump 101 to be supplied to the main inlet flow path 221. In the main inlet flow path 221, the coolant supplied from the pump 101 flows in one direction from the upstream end of the main inlet flow path 221 to the downstream end (positive X-axis direction). Fig. 4. The connecting line 111 extends straight along the side surface of the cylinder block 2 in the second straight direction. However, the line is not limited to this.

[0031] The number of branch inlet flow paths 222 corresponds to the number of cylinder liner cooling jackets 13. The plurality of branch inlet flow paths 222 are arranged in the first straight direction, with a space provided between them. The plurality of branch inlet flow paths 222 each extend from the main inlet flow path 221 to the inlet port 14A of the corresponding cylinder liner cooling jacket 13.

[0032] As in Fig. As illustrated in Figure 4, each of the branch inlet flow paths 222 is inclined in the first straight direction from the upstream end to the downstream end of the main inlet flow path 221, with the distance from the main inlet flow path 221 increasing in the second straight direction. In this way, the coolant flowing in the main inlet flow path 221 from the upstream end to the downstream end can easily enter each of the branch inlet flow paths 222.

[0033] The cooling fluid supplied from pump 101 to the main inlet flow path 221 is introduced via the plurality of branch inlet flow paths 222 into each of the plurality of cylinder liner cooling jackets 13.

[0034] As in Fig. As illustrated in Figure 6, the inlet flow path 22, which includes the main inlet flow path 221 and the plurality of branch inlet flow paths 222 described above, is arranged at a height corresponding to the upper section of the cylinder liner cooling jacket 13, as is the inlet port 14A. Cylinder liner exit flow path

[0035] As in Fig. 1, Fig. 4 and Fig. As illustrated in Figure 6, a cylinder liner outlet flow path 23 (outlet flow path) is formed in the cylinder block 2, extending from the outlet port 14B of the cylinder liner cooling jacket 13 and opening towards the outside of the cylinder block 2. The cylinder liner outlet flow path 23 directs the coolant discharged from the outlet port 14B of the cylinder liner cooling jacket 13 to the outside of the cylinder block 2. In the present embodiment, the cylinder liner outlet flow path 23 opens into the upper surface 2a of the cylinder block 2. The cylinder liner outlet flow path 23 directs the coolant discharged from the outlet port 14B of the cylinder liner cooling jacket 13 to a cylinder head cooling jacket 31 of the cylinder head 3, which will be described later.

[0036] The cylinder liner outlet flow path 23 is coupled to each of the plurality of cylinder liner cooling jackets 13. That is, the cylinder liner outlet flow paths 23, the number of which corresponds to the cylinder liner cooling jackets 13, are formed in the cylinder block 2. Drainage flow path

[0037] As in Fig. 1, Fig. 5 and Fig. As illustrated in Figure 6, a drain flow path 24, extending from the drain port 14C of the cylinder liner cooling jacket 13, is formed in the cylinder block 2. The drain flow path 24 directs the coolant discharged from the drain port 14C of the cylinder liner cooling jacket 13 to the outside of the cylinder block 2.

[0038] In the present embodiment, the drain flow path 24 is coupled to a first oil cooler 7, which will be described later. Thus, the coolant discharged from the drain port 14C of the cylinder liner cooling jacket 13 is directed to the first oil cooler 7. First oil cooler

[0039] As in Fig. As illustrated in Figures 2 and 4 to 6, the first oil cooler 7 (oil cooler) according to the present embodiment is integrally provided in the cylinder block 2. The first oil cooler 7 is configured to cool lubricating oil used to lubricate all components in the engine 1 with the cooling fluid discharged from the cylinder liner cooling jacket 13 or a cylinder head cooling jacket 31 described later. Cylinder head

[0040] As in Fig. 3 and Fig. As illustrated in Figure 6, the cylinder head 3 is arranged on the upper surface 2a of the cylinder block 2 to cover the upper ends of the plurality of cylinders 11. Although not shown, an inlet port and an outlet port are formed in the cylinder head 3, which communicate with the combustion chamber 11A of cylinder 11. Furthermore, an inlet valve and an exhaust valve are fitted to the cylinder head 3. The inlet valve opens and closes the opening of the inlet port on the side of cylinder 11. The exhaust valve opens and closes the opening of the exhaust port on the side of cylinder 11.

[0041] As in Fig. 1 and Fig. As illustrated in Figure 6, the cylinder head cooling jacket 31, through which the coolant flows, is formed in the cylinder head 3. The cylinder head cooling jacket 31 is formed, for example, around a section of the cylinder head 3 where the exhaust port is located, or around a section of it where the intake valve and exhaust valve are attached. This allows this forming and attachment section to be cooled by the coolant flowing in the cylinder head cooling jacket 31.

[0042] A cylinder head outlet flow path 32, extending from the cylinder head cooling jacket 31, is formed in the cylinder head 3. The cylinder head outlet flow path 32 directs the coolant discharged from the cylinder head cooling jacket 31 to the first oil cooler 7. rocker arm housing

[0043] As in Fig. 2, Fig. 3 and Fig. As illustrated in Figure 6, the rocker arm housing 4 is provided in the upper section of the cylinder head 3. Valve train components (not illustrated) such as a camshaft or rocker arm are arranged on an inner side of the rocker arm housing 4. sump

[0044] As in Fig. 2 and Fig. As illustrated in Figure 3, the oil pan 5 is located in the lower section of the cylinder block 2. Lubricating oil is stored in the oil pan 5. The lubricating oil stored in the oil pan 5 is supplied to each component (inside the cylinder block 2, inside the rocker arm housing 4, and the like) of the engine 1 by means of an oil pump (not illustrated). pump

[0045] As in Fig. As illustrated in Figure 1, pump 101 removes the coolant to supply it to engine 1. The connecting line 111, which extends from pump 101 to the main inlet flow path 221 of the cylinder block 2, is coupled to a discharge port of pump 101. Pump 101 is driven by the power of engine 1. Pump 101 is always in operation while engine 1 is running.

[0046] In Fig. 2, Fig. 4 and Fig. In section 5, the pump 101 is attached to the outer surface of the cylinder block 2 of the engine 1. However, the pump can be attached to other sections of the engine 1 or can, for example, be arranged at a distance from the engine 1. cooler

[0047] As in Fig. As illustrated in Figure 1, the cooler 102 exchanges heat between the coolant and the outside air to cool the coolant which has been heated by flowing through each of the components (the cylinder liner cooling jacket 13, the head cooling jacket 31 and the first oil cooler 7) of the engine 1.

[0048] An outlet 102b for the coolant in the cooler 102 is coupled to a suction port of the pump 101, which was described above. Thus, the coolant cooled by the cooler 102 flows towards the pump 101. The outlet 102b of the cooler 102 can, for example, be coupled directly to the pump 101. In the present embodiment, however, the outlet is coupled to the pump 101 via a second oil cooler 104, which will be described later. Second oil cooler

[0049] The engine system 100 according to the present embodiment further includes the second oil cooler 104. The second oil cooler 104 cools brake fluid used in the brakes of a work vehicle. The second oil cooler 104 is connected to the outlet 102b for the coolant in the cooler 102. This allows the coolant to flow from the cooler 102 through the second oil cooler 104, thus enabling heat exchange between the coolant and the brake fluid to cool the brake fluid. The coolant discharged from the second oil cooler 104 flows towards the pump 101. thermostat

[0050] Thermostat 103 is located midway along the coolant flow path from engine 1 to radiator 102, meaning it is positioned between engine 1 and radiator 102. A radiator connection flow path 113, which connects thermostat 103 and radiator 102, is provided between these two components. Additionally, a bypass flow path 114, which connects thermostat 103 and the second oil cooler 104, is provided between thermostat 103 and the second oil cooler 104.

[0051] The thermostat 103 switches the coolant flow path according to the coolant temperature, so that the coolant flows from the engine 1 through the radiator connection flow path 113 or the bypass flow path 114. Specifically, the thermostat 103 causes the coolant to flow through the bypass flow path 114 if the coolant temperature is lower than a predetermined temperature during engine 1 warm-up or similar processes. Furthermore, the thermostat 103 causes the coolant to flow only through the radiator connection flow path 113 if the coolant temperature is at or above the predetermined temperature.

[0052] In Fig. 2, Fig. 4 and Fig. In section 5, the thermostat 103 is attached to the outer surface of the cylinder block 2 of the engine 1 and is located along the first oil cooler 7. It should be noted that the thermostat 103 may, for example, be attached to other sections of the engine 1 or may be positioned at a distance from the engine 1. Operation and effects

[0053] In the engine system 100 configured as described above, the coolant circulates between the engine 1 and the pump 101 when the engine 1 is running. Specifically, when the coolant temperature is lower than the preset temperature, the coolant flows from the pump 101 through the engine 1 and the second oil cooler 104 in that sequence, and returns to the pump 101. When the coolant reaches the preset temperature or higher, the coolant flows from the pump 101 through the engine 1, the radiator 102, and the second oil cooler 104 in that sequence, and returns to the pump 101.

[0054] Next, the flow of coolant in motor 1 is described. In a state where motor 1 is driven, the coolant is introduced into the inlet flow path 22 of motor 1 when pump 101 is operating.

[0055] As in Fig. As illustrated in Figures 4 to 7, the coolant is introduced from the inlet flow path 22 through the individual inlet ports 14A into the plurality of cylinder liner cooling jackets 13 and discharged from the plurality of cylinder liner cooling jackets 13 through the individual outlet ports 14B. Here, the inlet ports 14A and the outlet ports 14B are positioned in the upper section of each of the cylinder liner cooling jackets 13. Thus, the coolant actively flows in the upper section of each of the cylinder liner cooling jackets 13 instead of in their lower section. This makes it possible to cool the upper section of the cylinder liner 12 more actively than its lower section.

[0056] Since fuel 1 burns (explodes) in the combustion chamber 11A in the upper section of the cylinder liner 12 (cylinder 11) of the running engine, the upper section of the cylinder liner 12 is hotter than its lower section. Therefore, by cooling the upper section of the cylinder liner 12 more actively than its lower section, it is possible to cool the cylinder liner 12 adequately.

[0057] Furthermore, in the present embodiment of the motor 1, the drain port 14C is formed in the lower section of the cylinder liner cooling jacket 13. If the motor 1 is stored for an extended period, it is therefore possible to drain the coolant from the drain port 14C of the cylinder liner cooling jacket 13 in order to empty the cylinder liner cooling jacket 13.

[0058] When the engine 1 is stored for an extended period, the coolant discharged from the drain port 14C is preferably discharged at least to the outside of the engine 1. In the engine system 100 according to the present embodiment, the coolant discharged from the drain port 14C is preferably discharged from an outlet port (not illustrated) provided in a section of the flow path in which the coolant circulates, wherein the section is arranged in the up-down direction at the lowest position of the flow path, and wherein the outlet port can be opened and closed. This outlet port can, for example, be provided at any point in the flow path connecting the second oil cooler 104 and the pump 101. Furthermore, the outlet port may optionally be opened and closed by means of a predetermined sealing element (tap or plug).

[0059] Furthermore, in the motor 1 according to the present embodiment, the flow path cross-sectional area S3 of the drain port 14C is smaller than the flow path cross-sectional areas S1 and S2 of the inlet port 14A and the outlet port 14B. As a result, the flow rate of the coolant flowing through the drain port 14C can be lower than the flow rate of the coolant flowing through the inlet port 14A and the outlet port 14B.Even if no component such as an on / off valve configured to open and close the drain port 14C is provided at or around the drain port 14C, the amount of coolant introduced from the inlet port 14A into the cylinder liner cooling jacket 13 and discharged from the cylinder liner cooling jacket 13 to the outside via the outlet port 14B is greater than the amount of coolant discharged from the drain port 14C to the outside. Thus, it is possible to actively cool the upper portion of the cylinder liner 12 with the coolant, even if the drain port 14C is left open. In other words, it is possible to prevent the cylinder liner 12 from not being adequately cooled due to an open drain port 14C.

[0060] Furthermore, according to the present embodiment, the engine 1 includes a plurality of pairs of cylinder liners 12 and cylinder liner cooling jackets 13, corresponding to the plurality of cylinders 11. The inlet port 14A and the outlet port 14B are formed in each of the cylinder liner cooling jackets 13. This makes it possible to adequately cool the plurality of cylinder liners 12 in a state in which the engine 1 is running.

[0061] Furthermore, in the motor 1 according to the present embodiment, lower sections of the cylinder liner cooling jackets 13 are coupled to one another by the connecting flow path 21. In addition, the drain port 14C is formed in only one cylinder liner cooling jacket 13. When the coolant is drained from the plurality of cylinder liner cooling jackets 13 to store the motor 1 for an extended period, it is thus possible to cause the coolant to flow through the connecting flow path 21 from the cylinder liner cooling jacket 13 that does not include the drain port 14C, and also to cause the coolant to flow through the cylinder liner cooling jacket 13 that does include the drain port 14C. This allows the coolant to be drained from the plurality of cylinder liner cooling jackets 13 through a single drain port 14C. This means it is possible to empty the multitude of cylinder liner cooling jackets 13.

[0062] Furthermore, in the engine 1 according to the present embodiment, only one drain port 14C is provided for the plurality of cylinder liner cooling jackets 13, each enclosing the inlet port 14A and the outlet port 14B. This makes it possible to reduce the ratio of the flow path cross-sectional area S3 of the drain port 14C relative to the flow path cross-sectional areas S1 and S2 of the inlet port 14A and the outlet port 14B of each of the cylinder liner cooling jackets 13 compared to a case in which the drain port 14C is provided in each of the cylinder liner cooling jackets 13. Thus, even if the drain port 14C is left open, it is possible to more effectively prevent the cylinder liner 12 from not being adequately cooled due to the open drain port 14C.

[0063] Furthermore, in the motor 1 according to the present embodiment, the cross-sectional area S4 of the connecting flow path 21 is larger than the cross-sectional area S3 of the drain port 14C. Thus, when the coolant is drained from the plurality of cylinder liner cooling jackets 13, the flow rate of the coolant flowing from a cylinder liner cooling jacket 13 that does not include the drain port 14C to the cylinder liner cooling jacket 13A (defined cylinder liner cooling jacket 13A) that does include the drain port 14C is greater than the flow rate of the coolant flowing from the drain port 14C to the outside. In this way, the coolant can be easily collected in the defined cylinder liner cooling jacket 13A. This makes it possible to efficiently drain the coolant from the multitude of cylinder liner cooling jackets 13.

[0064] Furthermore, in the motor 1 according to the present embodiment, the cross-sectional area S4 of the connecting flow path 21 is smaller than the cross-sectional areas S1 and S2 of the inlet port 14A and the outlet port 14B. This makes it possible to design the flow rate of the coolant flowing through the connecting flow path 21 to be lower than the flow rate of the coolant flowing through the inlet port 14A and the outlet port 14B of the cylinder liner cooling jacket 13. In this way, the coolant introduced from the inlet port 14A into the cylinder liner cooling jacket 13 actively flows from the outlet port 14B towards the outside of the cylinder liner cooling jacket 13 instead of towards the connecting flow path 21.Thus, it is possible to actively cool the upper section of the cylinder liner 12 with the coolant, even if the connecting flow path 21 is coupled to the lower section of the cylinder liner cooling jacket 13. Other embodiments

[0065] The embodiment of the present invention has been described above. However, the present invention is not limited to this embodiment. It is possible to modify the embodiment accordingly within the scope of the present invention.

[0066] In the present invention, the first oil cooler is not limited to being arranged on the downstream side of the cylinder liner cooling jacket or the cylinder head cooling jacket. The first oil cooler can, for example, be arranged on the downstream side of the pump and also on the upstream side of the inlet flow path (engine).

[0067] The number of cylinders in the engine according to the present invention can, for example, be one. Reference symbol list

[0068] 1 Engine, 2 Cylinder block, 11 Cylinder, 12 Cylinder liner, 13, 13A Liner cooling jacket, 14A Inlet port, 14B Outlet port, 14C Drain port, 21 Connecting flow path, S1 Flow path cross-sectional area of ​​the inlet port 14A, S2 Flow path cross-sectional area of ​​the outlet port 14B, S3 Flow path cross-sectional area of ​​the drain port 14C, S4 Flow path cross-sectional area of ​​the connecting flow path 21 QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 5939176 B

[0003]

Claims

[1] Motor, comprising: a cylinder block including a cylinder liner which has a cylindrical shape and forms a cylinder extending in an up-down direction; and a cylinder liner cooling jacket through which a coolant flows and which is formed around the cylinder liner, wherein an inlet port and an outlet port are formed in an upper section of the liner cooling jacket, wherein the inlet port is configured to introduce the coolant into the liner cooling jacket, and wherein the outlet port is configured to discharge the coolant from the liner cooling jacket. a drain port is formed in a lower section of the cylinder liner cooling jacket, wherein the drain port is configured to discharge the coolant from the cylinder liner cooling jacket in order to drain the cylinder liner cooling jacket, and The cross-sectional area of ​​the flow path of the drain connection is smaller than the cross-sectional areas of the flow path of the inlet connection and the outlet connection. [2] Motor according to claim 1, wherein the cylinder block a multitude of pairs from the cylinder liner and the liner cooling jacket and includes a connecting flow path configured to connect lower sections of adjacent cylinder liner cooling jackets, the inlet port and the outlet port are formed in each of a multitude of the cylinder liner cooling jackets and The drain port is only formed in one of the cylinder liner cooling jackets. [3] Motor according to claim 2, wherein a flow path cross-sectional area of ​​the connecting flow path is larger than the flow path cross-sectional area of ​​the drain connection. [4] Motor according to claim 2 or 3, wherein the cross-sectional area of ​​the connecting flow path is smaller than the flow path cross-sectional areas of the inlet connection and the outlet connection.

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