CN215617750U - Gear pair mounting tool - Google Patents

Abstract

The present invention relates to a gear pair mounting tool, a gear pair including a first gear and a second gear that are engaged with each other, the second gear being provided with a through hole, the gear pair mounting tool including: a handle having an inner cavity; an actuation button slidably disposed in the interior cavity of the handle at one side of the handle; a plate member located at the other side of the handle opposite to the actuating button; a transmission unit operatively connected to the actuating button and transmitting an operating force acting on the actuating button; an engaging unit provided on the plate-like member and capable of changing its size under the operating force transmitted by the transmission unit so as to be releasably engageable with the through-hole of the second gear to load the gear pair to be mounted to the gear pair mounting tool. With this tool, the worker can simultaneously mount the two gears at a predetermined position in a state of being accurately meshed with each other, and time is saved. In addition, the long tool is convenient to use in a narrow space.

Description

Gear pair mounting tool

Technical Field

The utility model relates to a gear pair mounting tool. In particular, the present invention relates to a gear pair installation tool for installing a balance shaft gear pair including a first gear (e.g., a primary gear) and a second gear (e.g., a secondary gear) that mesh with each other in a crankcase.

Background

As is known to those skilled in the engine art, a balance shaft driven by a balance shaft gear pair is typically mounted in the engine. The balance shaft gear pair includes a first gear (e.g., a primary gear) and a second gear (e.g., a secondary gear) that mesh with each other, and the first gear of the balance shaft gear pair is driven by a crankshaft gear that meshes therewith. The balance shaft gear pair and the crankshaft gear are both installed in a crankcase of the engine. With regard to the installation of the balance shaft gear pair, conventionally, a worker manually installs one gear of the balance shaft gear pair first and then manually installs the other gear of the balance shaft gear pair. However, this mounting method has the following problems. First, the first and second gears of the balance shaft gear pair are separated before installation, and it is difficult to ensure accurate meshing between the first and second gears after installation by installing the first and second gears in succession. Secondly, the installation of the balance shaft gear pair can be completed by at least two operations of workers, so that the time is long. Again, as can be seen from, for example, fig. 1, the space in the crankcase for performing the mounting operation of the balance shaft gear pair is small, and the installation is inconvenient for the worker.

SUMMERY OF THE UTILITY MODEL

In order to overcome at least one of the above-mentioned drawbacks of the prior art, the present invention provides a gear pair installation tool, a gear pair including a first gear and a second gear that are engaged with each other, the second gear being provided with a through hole, the gear pair installation tool comprising: a handle having an inner cavity; an actuation button slidably disposed in the interior cavity of the handle at one side of the handle; a plate located on the other side of the handle opposite the actuating button; a transmission unit operatively connected to the actuating button and configured to transmit an operating force acting on the actuating button; an engaging unit provided on the plate-like member, the engaging unit being capable of changing its size under the operating force transmitted by the transmission unit so as to be capable of releasably engaging with the through-hole of the second gear to load the gear pair to be mounted onto the gear pair mounting tool. With the gear pair mounting tool of the present invention, a worker can simultaneously mount the first gear and the second gear of the gear pair at a predetermined position in a state of being accurately meshed with each other, and also save the mounting time. In addition, the elongated gear pair mounting tool is convenient to use even in a narrow operating space.

According to a preferred embodiment, the gear pair installation tool further includes a positioning mechanism for preliminarily positioning the first gear and the second gear in the meshed state. Thereby, it is possible to facilitate the gear pair mounting tool to pick up the first gear and the second gear in a meshed state.

According to a preferred embodiment, the positioning mechanism is provided with a platen for placing a pair of gears to be engaged, and two positioning holes provided in the platen for ensuring that the first gear and the second gear placed on the positioning mechanism are positioned in a meshed state, the two positioning holes being a first positioning hole into which the first shaft of the first gear is to be inserted and a second positioning hole into which the sleeve of the second gear is to be inserted, respectively, and a distance between a center of the first positioning hole and a center of the second positioning hole is set to be equal to a distance between a center of the first gear and a center of the second gear in the meshed state, and the positioning mechanism is further provided with a positioning pin on the platen which is engaged with teeth of either one of the first gear and the second gear placed on the platen. According to the present invention, the first positioning hole of the first shaft into which the first gear is to be inserted and the second positioning hole of the sleeve into which the second gear is to be inserted also prevent the first gear and the second gear placed on the platen from moving along the plane of the platen. In addition, the positioning pin can prevent the second gear placed on the platen and the first gear engaged therewith from rotating.

According to a preferred embodiment, the gear pair installation tool is further provided with a clamping block for clamping the gear pair that has been loaded onto the gear pair installation tool. The clamp block can prevent the picked-up first and second gears from falling off from the gear pair mounting tool, and can also prevent the first and second gears picked up by the gear pair mounting tool from rotating relatively.

According to a preferred embodiment, the transmission unit comprises a first transmission rod connected with the actuating button and capable of sliding in the inner cavity of the handle, and a second transmission rod in pressure contact with the first transmission rod and capable of rotating around the pin shaft. In this way, an operating force acting on the actuating button can be transmitted to the engaging unit and the clamping block via the first and second transmission levers.

According to a preferred embodiment, the first transmission rod is provided with a stop at the end in contact with the second transmission rod for limiting the end-of-travel position of the first transmission rod when moving towards the actuation button. The locating part can prevent that first drive lever from sliding too much and deviating from the hollow column spare of handle rightwards.

According to a preferred embodiment, the plate-like member comprises a first plate-like member fixedly connected to the handle and a second plate-like member located at one side of the first plate-like member and movable relative to the first plate-like member, and the engaging unit comprises a first engaging member provided on the first plate-like member and a second engaging member provided on the second plate-like member, and a first biasing means is provided between the first engaging member and the second engaging member for biasing the second engaging member in a direction to move the second engaging member away from the first engaging member.

According to a preferred embodiment, the second plate-like member is provided with a hook portion which is in pressure contact with one end of the second transmission lever, and the operating force transmitted to the second transmission lever can be transmitted to the second engaging member via the second plate-like member provided with the hook portion to move the second engaging member toward the first engaging member against the biasing force of the first biasing means to reduce the size of the engaging unit.

According to a preferred embodiment, the first joint member is provided with a first joint block with a D-shaped cross section, the second joint member is also provided with a second joint block with a D-shaped cross section, and the first joint block and the second joint block are tapered along the extension direction of the joint blocks on the arc side. In this way, the first engagement piece and the second engagement piece can be inserted into the through hole of the second gear more easily.

According to a preferred embodiment, the clamping blocks are located on the other side of the first plate-like element opposite the second plate-like element, the clamping blocks are provided with a boss and in the first plate-like element a recess is provided, the boss is received in the recess movably in the longitudinal direction of the first plate-like element, and the clamping blocks and the second plate-like element, which are located on both sides of the first plate-like element, respectively, are fixedly connected to each other by means of a screw penetrating the recess. In this way, the operating force transmitted to the second plate-like member can also be transmitted to the clamping block.

According to a preferred embodiment, second biasing means are provided between the clamping block and the handle for biasing the clamping block in a direction to bring the clamping block close to the engaging unit.

Further features of the utility model will become apparent from the following description of exemplary embodiments with reference to the attached drawings.

Drawings

The present invention will now be described in detail hereinafter with reference to the accompanying drawings. It is understood that the drawings are not necessarily to scale and that the drawings are merely illustrative of exemplary embodiments of the utility model and are not to be considered limiting of its scope. Wherein:

fig. 1 schematically illustrates a crankcase 10 mounted with a balance shaft gear pair according to an exemplary embodiment of the utility model;

fig. 2 schematically shows the first gear 20 and the second gear 30 of the balance shaft gear pair in a meshed state with each other;

fig. 3 schematically shows a positioning mechanism 200 for preliminarily positioning the first gear 20 and the second gear 30 in an engaged state;

fig. 4 schematically shows a perspective view of a gear pair installation tool 100 according to an exemplary embodiment of the present invention in a first operational state;

fig. 5 schematically shows a perspective view of the gear pair installation tool 100 in a second operating state;

fig. 6 schematically illustrates a bottom view of the gear pair installation tool 100 of fig. 4, viewed from below up;

FIG. 7 schematically illustrates a cross-sectional view of the handle 110 of the gear pair installation tool 100;

fig. 8 schematically shows a perspective view of the first plate 120 of the gear pair installation tool 100;

fig. 9 schematically shows a perspective view of the first engagement member 127 of the gear pair installation tool 100 to be attached to the first plate member 120;

fig. 10 schematically shows a perspective view of a second plate-like member 130 of the gear pair installation tool 100 located on one side of the first plate-like member 120 and movable relative to the first plate-like member 120;

fig. 11 schematically shows a perspective view of the second joint member 135 of the gear pair installation tool 100 to be attached to the second plate member 130;

fig. 12 schematically shows the clamping block 140 of the gear pair installation tool 100 on the other side of the first plate 120 and movable relative to the first plate 120.

Detailed Description

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the description of the various embodiments is illustrative only and is not intended to limit the technology of the present invention in any way. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

It should be understood that like reference numerals refer to like elements throughout the several views. In the drawings, the dimensions of some of the elements may be modified, exaggerated or reduced for clarity; or some components may be omitted or shown in somewhat schematic form in order to highlight certain components.

Unless otherwise defined, all terms used in the specification have the meanings commonly understood by those skilled in the art. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

As used in this specification, the singular forms "a", "an", and "the" may include the plural forms as well, unless expressly stated otherwise. The description uses the words "comprise", "comprising" and "includes" to specify the presence of stated features, but not to preclude the presence or addition of one or more other features. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description, when an element is referred to as being "on," "attached" to, "connected" to, "contacting" or the like to another element, it can be directly on, attached to, connected to or contacting the other element or intervening elements may be present.

In the following, unless otherwise specified, "left", "right", "upper", "lower", "outer", "inner", and the like are referred to directions in the drawings. It should be understood that spatial relational terms, such as "left," "right," "upper," "lower," "outer," "inner," and the like, are intended to describe the relationship of one feature to another feature in the figures. It will be understood that the spatial relationship wording includes different orientations of the gear pair installation tool in use or operation in addition to the orientation shown in the drawings.

Hereinafter, the structure and operation of the gear pair installation tool 100 according to an exemplary embodiment of the present invention will be described in detail.

First, as an exemplary mounting object, a balance shaft gear pair including a first gear 20 (e.g., a main gear) and a second gear 30 (e.g., a sub gear) to be mounted in a crankcase 10 (see fig. 1) in a state of meshing with each other will be described with reference to fig. 1 to 2. As shown in fig. 2, the first gear 20 of the balance shaft gear pair is provided with a first gear body 21, a first shaft 22 projecting centrally from one side of the first gear body 21, and a second shaft (not shown) projecting centrally from the opposite side of the first gear body 31, the second shaft being opposed to the first shaft 22 across the first gear body 31. The second gear 30 of the balance shaft gear pair is provided with a second gear body 31, a sleeve 32 projecting centrally from one side of the second gear body 31, and a through-hole (not shown) at the opposite side of the second gear body 31, the through-hole being located at the center of the second gear 30 and opposing and communicating with the sleeve 32.

Next, a positioning mechanism 200 for preliminarily positioning the first gear 20 and the second gear 30 in the meshed state will be described with reference to fig. 3. According to an exemplary embodiment, the positioning mechanism 200 may include a platen 201 on which the first and second gears 20, 30 are to be placed. At least one positioning hole and/or at least one positioning block for ensuring that the first gear 20 and the second gear 30 placed on the platen 201 are positioned in an engaged state is provided on the platen 201. For example, in the exemplary embodiment shown, the platen 201 may be provided with three positioning blocks 202 and two positioning holes (first positioning hole 203 and second positioning hole 204, respectively). The diameter of the first locating hole 203 matches the outer diameter of the first shaft 22 of the first gear 20 to receive the first shaft 32 of the first gear 20. The diameter of the second positioning hole 204 matches the outer diameter of the sleeve 32 of the second gear 30 to receive the sleeve 32 of the second gear 30. The distance between the center of the first positioning hole 203 and the center of the second positioning hole 204 is set to be equal to the distance between the center of the first gear 20 and the center of the second gear 30 in the meshed state, thereby ensuring that the first gear 20, the first shaft 22 of which is inserted into the first positioning hole 203, and the second gear 30, the sleeve 32 of which is inserted into the second positioning hole 204, mesh with each other. Meanwhile, the first positioning hole 203 in which the first shaft 22 of the first gear 20 is to be inserted and the second positioning hole 204 in which the sleeve 32 of the second gear 30 is to be inserted also prevent the first gear 20 and the second gear 30 placed on the platen 201 from moving along the plane of the platen 201. Further, a positioning pin 205 that engages with the teeth of either one of the first gear 20 and the second gear 30 placed on the platen 201 may also be provided on the platen 201. Preferably, the positioning pin 205 is provided on the platen 201 at the side opposite to the positioning block 202. At this time, the positioning pins 205 will engage with the teeth of the second gear 30, whereby the second gear 30 placed on the platen 201 and the first gear 20 engaged therewith can be prevented from rotating. Fig. 4 schematically shows the first gear 20 and the second gear 30 which have been placed on the positioning mechanism 200 in a state of meshing with each other.

It is noted that the positioning mechanism 200 need not include all of the three positioning blocks 202, the first positioning hole 203, the second positioning hole 204, and the positioning pin 205, but may include only some of them without affecting the basic function of the positioning mechanism 200 to preliminarily position the first gear 20 and the second gear 30 in the engaged state. For example, the positioning mechanism 200 may not be provided with the positioning pin 205.

Next, a gear pair installation tool 100 according to an exemplary embodiment of the present invention will be described with reference to fig. 4 to 12. Fig. 4 schematically shows a perspective view of the gear pair installation tool 100 in a first operating state, fig. 5 schematically shows a perspective view of the gear pair installation tool 100 in a second operating state at a later stage, and fig. 6 schematically shows a bottom view of the gear pair installation tool 100, for example, as viewed from below to above in fig. 4.

As shown, in general, the gear pair installation tool 100 is elongated, i.e., has a small dimension in one direction, to facilitate operation in a narrow working space. The gear pair installation tool 100 may mainly include a handle 110, a first plate-like member 120 fixedly connected to the handle 110, a second plate-like member 130 located on one side (upper side in fig. 4) of the first plate-like member 120 and movable relative to the first plate-like member 120 along a longitudinal direction X of the gear pair installation tool 100, and a clamping block 140 located on the other side (lower side in fig. 4) of the first plate-like member 120 and movable relative to the first plate-like member 120 along the longitudinal direction X of the gear pair installation tool 100.

The handle 110 is hollow and is generally in the form of a hollow cylindrical member 111 provided at one end (the left end in fig. 4, 5, 6) with a generally annular flange 112. As shown in the sectional view of fig. 7, a first transmission rod 113 is slidably disposed in the inner cavity of the hollow cylindrical member 111. One end (right end in the drawing) of the first transmission lever 113 may be connected to an actuating button 114. In the illustrated embodiment, the actuating button 114 is an actuating rod, the outer diameter of which is larger than the outer diameter of the first transmission rod 113, so that the inner cavity of the hollow cylindrical member 111 is enlarged at the right side to accommodate the actuating button 114. The actuating button 114 is screw-coupled to the first transmission rod 113, and an end portion (i.e., left end in the drawing) of the actuating button 114 coupled to the first transmission rod 113 is slightly tapered toward the first transmission rod 113, whereby frictional resistance to sliding of the actuating button 114 in the inner cavity of the hollow cylindrical member 111 can be reduced. However, the present invention is not limited thereto. For example, the actuating button 114 may also be integrally formed with the first transmission lever 113. At this time, the right end of the first transfer lever 113 may serve as an actuating button. Further, the other end (left end in the drawing) of the first transmission lever 113 may contact the second transmission lever 115. As will be described further below, the second driving lever 115 will be always in pressure contact with the left end of the first driving lever 113 due to the pressing of the hook portion 132 of the second plate-like member 130. A groove 116 open to the left side is provided in the annular flange 112, and the direction in which the groove 116 extends is perpendicular to the longitudinal direction X of the handle 110 of the gear pair installation tool 100. The second transmission lever 115 is attached in said groove 116 perpendicularly to the first transmission lever 113 by means of a pin 117, such that the second transmission lever 115 can rotate in a clockwise or counterclockwise direction around the pin 117. The end of the first driving lever 113 contacting the second driving lever 115 may be provided with a stopper (e.g., a stopper ring) 118 at a position extending a distance to the right from the leftmost side. The outer diameter of the limiting member 118 is larger than the diameter of the inner cavity of the hollow cylindrical member 111, so that the stroke end position of the first driving rod 113 can be limited when sliding from left to right, and further the first driving rod 113 can be prevented from sliding too much to the right and falling out of the hollow cylindrical member 111 of the handle 110. Further, an end portion of the first transmission lever 113, which is in pressure contact with the second transmission lever 115, is rounded so that an operating force transmitted to the first transmission lever 113 through the actuating button 114 can be smoothly transmitted to the second transmission lever 115.

When the worker presses the actuating button 114 in the direction of arrow a (leftward in the drawing), the actuating button 114 and the first transmission rod 113 connected to the actuating button 114 slide in the inner cavity of the hollow cylindrical member 111 in the direction of arrow a. Since the left end of the first driving lever 113 is in pressure contact with the second driving lever 115, the first driving lever 113 moving leftward in the arrow a direction forces the second driving lever 115 to rotate counterclockwise in the arrow R direction in fig. 7. The second driving lever 115 rotated counterclockwise further pushes the hook 132 of the second plate-like member 130, which is in pressure contact therewith, to move rightward in the arrow B direction, as will be described further later.

The first plate 120 fixedly attached to the handle 110 will now be described with primary reference to fig. 8. Two screw holes 121 may be provided at the right end of the first plate-like member 120 (i.e., the end to be attached to the handle 110), so that the first plate-like member 120 may be fixedly connected to the annular flange 112 of the handle 110 by means of bolts passing through the screw holes 121. A groove 122 having one side opened may be provided at the right end of the first plate-like member 120, and the groove 122 may be U-shaped. One end of the second drive link 115 will be swingably received in the recess 122 within the recess 122 as shown in fig. 4. A further groove 123 is also provided in the first plate-like element 120, which groove 123 may be elongated. A screw (not shown) for connecting the second plate-like member 130 and the clamping block 140, which are respectively located at both sides of the first plate-like member 120, can be provided through the groove 123 so that the second plate-like member 130 and the clamping block 140 can be moved in the longitudinal direction X with respect to the first plate-like member 120, as will be described later. A through opening 124 is also provided at substantially the middle of the first plate-like member 120, through which opening 124 a second shaft of the first gear wheel 20 opposite the first shaft 22 will be able to protrude, as shown in fig. 4. At the left end of the first plate-like member 120, at least one screw hole 125 (e.g., two screw holes 125) is provided, and a first engaging member 127 (shown in fig. 9) for engaging with a through-hole of the second gear 30, which is opposite to the sleeve 32, is also provided with at least one corresponding screw hole 128 (e.g., two screw holes 128), so that the first engaging member 127 can be attached to the first plate-like member 120 (shown in fig. 6). A stopper groove 126 having a T shape, which will be described later, is provided at the left end of the first plate-like member 120.

As shown in fig. 9, the first engaging member 127 is provided with a first engaging piece 129 to be inserted into a through hole of the second gear 30. The first joint block 129 is a substantially D-shaped block in cross section. Preferably, the D-shaped engagement piece is slightly tapered on the arc side in the direction of extension of the block, so that the first engagement piece 129 can be inserted more easily into the through-hole of the second gear 30.

The second plate-like member 130 located at one side of the first plate-like member 120 and movable relative to the first plate-like member 120 will be described next mainly with reference to fig. 10. The second plate 130 is a generally L-shaped member that includes a longer first arm and a shorter second arm. At least one through hole 131 (e.g., two through holes 131) is provided on the longer first arm. As will be described later, the clamping block 140 is also provided with at least one screw hole 143 (e.g. two screw holes 143) in the boss 142, which boss 142 is to be movably received in the groove 123 of the first plate-like member 120 in the longitudinal direction of the first plate-like member 120. At least one screw (not shown) is screwed into the screw hole 143 in the boss 142 of the clamping block 140 through the through-hole 131 of the second plate-like member 130 and the groove 123 of the first plate-like member 120, thereby enabling the fixedly connected second plate-like member 130 and clamping block 140 to be integrally moved with respect to the first plate-like member 120. A hook 132 and a recess 133 formed by cutting a part of the first arm are provided at an end (right end in the drawing) of the longer first arm away from the second arm. The recess 133 of the second plate-like member 130, which is superimposed over the first plate-like member 120, will at least partially overlap the groove 122 of the first plate-like member 120, thereby defining a space for accommodating the second driving rod 115, as shown in fig. 4. As will be described further below, the hook 132 is always in pressure contact with one end of the second drive link 115, as shown in fig. 4 and 7. A screw hole 134 is provided on the shorter second arm of the second plate-like member 130 for attaching the second engagement member 135 configured to cooperate with the first engagement member 127 to the second plate-like member 130 by means of a screw rod passing through the screw hole 134 and a corresponding screw hole 137 of the second engagement member 135 (shown in fig. 11), as shown in fig. 6.

As shown in fig. 11, the second joint 135 is provided with a substantially T-shaped arm portion 136. The size of the T-shaped arm 136 is smaller than the size of the T-shaped limit groove 126 of the first plate-like member 120. The arm portion 136 is to be movably received in the stopper groove 126 of the first plate-like member 120 in the longitudinal direction of the first plate-like member 120, thereby enabling a later-described second engaging piece 138 of the second engaging member 135 to move relative to the first engaging piece 129 of the first engaging member 127 fixedly connected to the first plate-like member 120. The T-shaped limit groove 126 can define the stroke end position of the second engaging member 135 and the second plate-like member 130 connected thereto. Similarly, the second joint member 135 is also provided with a second joint block 138 to be inserted into the through hole of the second gear 30. The second engagement block 138 is also generally a block having a D-shaped cross-section. It is preferable that the D-shaped engaging piece of the second engaging piece 135 is slightly tapered along the extending direction of the block body on the arc side so that the second engaging piece 138 can be more easily inserted into the through hole of the second gear 30. A first biasing means 139 is provided between the first engaging piece 129 and the second engaging piece 138 for biasing the second engaging piece 138 always in a direction (i.e., leftward direction in fig. 6) to move the second engaging piece 138 away from the first engaging piece 129. The first biasing means 139 may be a compression spring. When the gear pair mounting tool 100 is not in use, that is, before the first engagement piece 129 and the second engagement piece 138 are not inserted into the through hole of the second gear 30, the maximum outer diameter of the engagement unit constituted by the first engagement piece 129 and the second engagement piece 138 is larger than the inner diameter of the through hole of the second gear 30. When the first biasing means 139 as a compression spring is compressed due to the pressing force applied by the worker on the actuation button 114, the maximum outer diameter of the engagement unit constituted by the first engagement piece 129 and the second engagement piece 138 is smaller than the inner diameter of the through-hole of the second gear 30, so that the first engagement piece 129 and the second engagement piece 138 can be inserted together into the through-hole of the second gear 30.

Next, the clamping block 140 located at the other side of the first plate-like member 120 and movable relative to the first plate-like member 120 will be described mainly with reference to fig. 12. The clamping block 140 mainly includes a clamping block body 141, a boss 142 protruding from the clamping block body 141, and a screw hole 143 in the boss 142. As previously described, at least one screw (not shown) is screwed into the screw hole 143 in the boss 142 of the clamping block 140 through the through-hole 131 of the second plate-like member 130 and the groove 123 of the first plate-like member 120, thereby fixedly connecting the clamping block 140 and the second plate-like member 130 together, while the boss 142 movable in the groove 123 of the first plate-like member 120 in the longitudinal direction of the first plate-like member 120 enables the clamping block 140 and the second plate-like member 130 to be integrally movable with respect to the first plate-like member 120. As shown in fig. 6, the clamping block body 141 is further provided with an inwardly recessed arc edge 144 at a side adjacent to the first engagement block 129. The radius of the arcuate edge 144 is substantially equal to the radius of the first gear 20. Between the clamping block 140 and the annular flange 112 of the handle 110, second biasing means 145 are provided for always biasing the clamping block 140 in a direction away from the handle 110 of the clamping block 140. The second biasing means 145 may also be a compression spring. After a gear pair including the first gear 20 and the second gear 30 engaged with each other as described later is picked up by the gear pair installation tool 100, the arc edge 144 of the clamp block 140 abutting the first gear 20 will clamp the first gear 20 in a direction toward the first engagement block 129 due to the biasing force of the second biasing means 145, thereby preventing the picked-up first gear 20 and second gear 30 from falling off the gear pair installation tool 100 and also preventing the first gear 20 and second gear 30 picked up by the gear pair installation tool 100 from rotating relatively, as shown in fig. 5.

As previously described, the first biasing means 139 disposed between the first engagement block 129 of the first plate 120 and the second engagement block 138 of the second plate 130 and the second biasing means 145 disposed between the clamping block 140 and the annular flange 112 of the handle 110 bias the second plate 130 and the clamping block 140, respectively, fixedly connected to each other to the left in fig. 6. The hook 132 of the second plate-like member 130, which is biased to the left, will in turn bias one end of the second drive link 115 to the left (i.e., into pressure contact with the second drive link 115). Note that the limiting groove 126 of the first plate member 120 limits the second plate member 130 provided with the second engaging member 135 from moving too much leftward. The second driving lever 115 biased to the left by the hook 132 will have a tendency to rotate, and then the other end of the second driving lever 115 will bias the first driving lever 113 to the right (as shown in fig. 7), while the stopper 118 of the first driving lever 113 abutting against the inner wall of the hollow cylindrical member 111 limits the first driving lever 113 from moving further to the right. That is, due to the biasing action of the first and second biasing means 139 and 145, one end of the second driving lever 115 is always in pressure contact with the first driving lever 113, and the other end of the second driving lever 115 is always in pressure contact with the hook portion 132 of the second plate-shaped member 130.

The structure of the gear pair installation tool 100 has been described above. The operation of the gear pair installation tool 100 will now be described with reference to fig. 4-7.

In the case where the positioning mechanism 200 is provided, first, the worker inserts the first shaft 22 of the first gear 20 into the first positioning hole 203 and inserts the sleeve 32 of the second gear 30 into the second positioning hole 204, and then inserts the positioning pin 205 so as to be engaged with the teeth of the second gear 30. In this way, it is achieved that the first gear 20 and the second gear 30 are held in the meshed state, as shown in fig. 4. Of course, in the case where the positioning mechanism 200 is not provided, the worker may manually keep the first gear 20 and the second gear 30 in the engaged state.

Next, the worker presses the actuating button 114 of the handle 110 leftward in the arrow a direction (i.e., the first direction) in fig. 4, 6, and 7, so that the actuating button 114 and the first transmission rod 113 connected thereto slide leftward in the inner cavity of the hollow handle 110 in the arrow a direction. The first driving lever 113 moving in the direction of arrow a will cause the second driving lever 115 in pressure contact therewith to rotate in the counterclockwise direction R about the pin shaft 117 as shown in fig. 7. The second driving lever 115 rotating in the counterclockwise R direction will then cause the hook 132 in pressure contact therewith to move rightward in the direction of arrow B (i.e., the second direction) opposite to the first direction (as shown in fig. 7), and the second plate-like member 130 provided with the hook 132 and the clamping block 140 fixedly connected with the second plate-like member 130 will also move rightward in the direction of arrow B (as shown in fig. 6 and 4) against the biasing forces of the first biasing means 139 and the second biasing means 145, further compressing the first biasing means 139 and the second biasing means 145. Thus, the distance between the first engagement piece 129 and the second engagement piece 138 is reduced to make the maximum outer diameter of the engagement unit constituted by the first engagement piece 129 and the second engagement piece 138 smaller than the inner diameter of the through hole of the second gear 30. At the same time, the distance between the clamping block 140 and the first engagement block 129 is enlarged. At this time, the worker snaps the first and second engaging pieces 129 and 138 down into the through hole of the second gear 30 and protrudes the second shaft of the first gear 20 through the through opening 124 of the first plate-like member 120. In practice, the worker inserts the first and second engagement blocks 129 and 138 downward into the through hole of the second gear 30 almost at the same time as pressing the actuation button 114.

Then, the worker releases the pressing force applied to the actuating button 114 of the handle 110, and the external force transmitted to the first driving lever 113, the second driving lever 115, the second plate-like member 130 and the clamping block 140 is eliminated. At this time, due to the biasing action of the first biasing means 139 and the second biasing means 145 attempting to return to their original states, the distance between the first engaging piece 129 and the second engaging piece 138, which have been engaged in the through hole of the second gear 30, attempts to increase, thereby securely snapping the first engaging piece 129 and the second engaging piece 138 in the through hole of the second gear 30. At the same time, the distance between the clamping block 140 that presses the first gear 20 and the first engaging block 129 of the engaging unit tries to decrease, whereby the first gear 20 and the second gear 30 that are engaged with each other are clamped between the clamping block 140 and the engaging unit, so that the first gear 20 and the second gear 30 can be reliably picked up by the gear pair mounting tool 100 in an engaged state.

Thereafter, the worker lifts the gear pair installation tool 100, which has picked up the first gear 20 and the second gear 30 engaged with each other, from the positioning mechanism 200 (as shown in fig. 5), and moves the gear pair installation tool 100 into a predetermined installation space of the crankcase 10 in an orientation rotated 90 degrees counterclockwise from the orientation shown in fig. 5. For example, the first shaft 22 of the first gear 20 would be inserted through a first hole in a wall of the crankcase 10 to protrude outside the crankcase 10, and the sleeve 32 of the second gear 30 would be inserted into a second hole in the wall of the crankcase 10. Next, the worker screws a fastening means (e.g., a bolt) onto the first shaft 22 of the first gear 20, for example, from the outside of the crankcase 10, thereby fixing the first gear 20 and the second gear 30, which are meshed with each other, to predetermined positions on the crankcase 10.

Finally, the worker again presses the actuation button 114 of the handle 110 in the direction of arrow a. As described above, the distance between the first engagement piece 129 and the second engagement piece 138 is again reduced such that the maximum outer diameter of the engagement unit constituted by the first engagement piece 129 and the second engagement piece 138 is smaller than the inner diameter of the through hole of the second gear 30, and the distance between the clamp piece 140 and the first engagement piece 129 of the engagement unit is again enlarged. At this time, the worker can easily withdraw the first engagement block 129 and the second engagement block 138 from the through hole of the first gear 20, and further withdraw the entire gear pair installation tool 100 from the crankcase 10. After withdrawing the gear pair installation tool 100, the worker may release the action on the actuation button 114 of the handle 110.

In the present invention, the first engagement piece 129 of the first engaging member 127 and the second engagement piece 138 of the second engaging member 135 constitute an engagement unit that can be releasably engaged with the through-hole of the second gear to pick up the gear pair. The first transmission lever 113 connected to the actuating button 114, the second transmission lever 115 pressure-contacted with the first transmission lever 113, and the second plate-shaped member 130 pressure-contacted with the second transmission lever 115 constitute a transmission unit for transmitting the operating force acting on the actuating button 114 to the engaging unit and the clamping block 140.

In the present invention, although only an example in which the gear pair installation tool 100 installs the balance shaft gear pair including the first gear 20 and the second gear 30 in the crankcase 10 in a meshed state with each other has been described, the present invention is not limited thereto. For example, the gear pair installation tool 100 may be used to install other gear pairs than balance shaft gear pairs.

In the present invention, although the first gear 20 and the second gear 30 are preliminarily positioned in the meshed state by means of the positioning mechanism 200, the present invention is not limited thereto. The entire positioning mechanism 200 is preferred but not required. For example, the gear pair installation tool 100 may not be provided with the positioning mechanism 200, and the worker may directly manually place the first gear 20 and the second gear 30 at the corresponding positions of the gear pair installation tool 100 in an engaged state.

In the present invention, although the clamping block 140 for clamping the gear pair that has been loaded onto the gear pair installation tool 100 on the gear pair installation tool 100 is provided, the present invention is not limited thereto. For example, the gear pair mounting tool 100 may not be provided with the clamp block 140 in a state where the engagement unit is sufficiently tightly engaged with the through hole of the second gear 30.

With the gear pair installation tool 100 of the present invention, a worker can simultaneously install the first gear and the second gear of the balance shaft gear pair in a state of meshing with each other at a predetermined position in the crankcase. Compared with the case of successively mounting the first gear and the second gear, the first gear and the second gear which are simultaneously mounted can be ensured to be accurately meshed with each other, and the mounting time is also saved. Further, the elongated gear pair installation tool 100 is convenient to use even in a narrow operating space.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the utility model is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims (10)

1. A gear pair mounting tool, a gear pair including a first gear (20) and a second gear (30) that are engaged with each other, the second gear (30) being provided with a through-hole, characterized in that the gear pair mounting tool (100) comprises:

a handle (110) provided with an inner cavity;

an actuation button (114), the actuation button (114) being slidably disposed in an interior cavity of the handle (110) at a side of the handle (110);

a plate located on the other side of the handle (110) opposite the actuation button (114);

a transmission unit operatively connected to the actuating button (114) and configured to transmit an operating force acting on the actuating button (114);

an engagement unit provided on the plate-like member, the engagement unit being capable of changing its size under the action of the operating force transmitted by the transmission unit so as to be capable of releasably engaging with the through-hole of the second gear (30) to load the gear pair to be mounted onto the gear pair mounting tool (100).

2. The gear pair installation tool according to claim 1, further comprising a positioning mechanism (200) for preliminarily positioning the first gear (20) and the second gear (30) in the meshed state.

3. The gear pair mounting tool according to claim 2, wherein the positioning mechanism (200) is provided with a platen (201) for placing a gear pair to be engaged, and two positioning holes provided in the platen (201) for ensuring that the first gear (20) and the second gear (30) placed on the positioning mechanism (200) are positioned in a meshed state, the two positioning holes being a first positioning hole (203) into which the first shaft (22) of the first gear (20) is to be inserted, and a second positioning hole (204) into which the sleeve (32) of the second gear (30) is to be inserted, respectively, and a distance between a center of the first positioning hole (203) and a center of the second positioning hole (204) is set to be equal to a distance between a center of the first gear (20) and a center of the second gear (30) in a meshed state, and the positioning mechanism (200) is further provided on the platen (201) with the first gear (201) placed on the platen (201) (20) And a positioning pin (205) that engages with the teeth of any one of the second gears (30).

4. The gear pair installation tool according to any one of claims 1 to 3, wherein the gear pair installation tool (100) is further provided with a clamping block (140) for clamping a gear pair that has been loaded onto the gear pair installation tool (100) on the gear pair installation tool (100).

5. The gear pair installation tool according to claim 4, wherein the transmission unit comprises a first transmission rod (113) connected with the actuating button (114) and slidable in the inner cavity of the handle (110), and a second transmission rod (115) in pressure contact with the first transmission rod (113) and rotatable about a pin shaft (117), the operating force acting on the actuating button (114) being transmittable to the engagement unit and the clamping block (140) via the first transmission rod (113) and the second transmission rod (115).

6. The gear pair installation tool according to claim 5, wherein the first transmission lever (113) is provided with a limit stop (118) at the end in contact with the second transmission lever (115) for limiting the end of travel position of the first transmission lever (113) when moving towards the actuation button (114).

7. The gear pair mounting tool according to claim 5, wherein the plate-like member includes a first plate-like member (120) fixedly connected to the handle (110) and a second plate-like member (130) located at one side of the first plate-like member (120) and movable relative to the first plate-like member (120), the engaging unit includes a first engaging member (127) provided on the first plate-like member (120) and a second engaging member (135) provided on the second plate-like member (130), and a first biasing means (139) for biasing the second engaging member (135) in a direction to move the second engaging member (135) away from the first engaging member (127) is provided between the first engaging member (127) and the second engaging member (135).

8. The gear pair mounting tool according to claim 7, wherein the second plate-like member (130) is provided with a hook portion (132) which is in pressure contact with one end of the second transmission lever (115), and the operating force transmitted to the second transmission lever (115) can be transmitted to the second engaging member (135) via the second plate-like member (130) provided with the hook portion (132) so as to move the second engaging member (135) toward the first engaging member (127) against the biasing force of the first biasing means (139) to reduce the size of the engaging unit.

9. The gear pair mounting tool according to claim 7, wherein the first engaging member (127) is provided with a first engaging piece (129) having a D-shaped cross section, the second engaging member (135) is also provided with a second engaging piece (138) having a D-shaped cross section, and both the D-shaped first engaging piece (129) and the D-shaped second engaging piece (138) are tapered along an extending direction of the engaging pieces on arc side.

10. The gear pair mounting tool according to claim 7, wherein the clamping block (140) is located on the other side of the first plate-like member (120) opposite to the second plate-like member (130), the clamping block (140) is provided with a boss (142), and a groove (123) is provided in the first plate-like member (120), the boss (142) is movably received in the groove (123) in the longitudinal direction of the first plate-like member (120), and the clamping block (140) and the second plate-like member (130) respectively located on both sides of the first plate-like member (120) are fixedly connected to each other by a screw penetrating the groove (123), and a second biasing means (145) for biasing the clamping block (140) in a direction for bringing the clamping block (140) close to the engaging unit is provided between the clamping block (140) and the handle (110).

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